JP2012090582A - Mowing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve follow-up properties of a cutting mechanism to a ground surface (a levee or a ridge surface etc.) in a mowing apparatus which can be mounted on a mobile agricultural machine such as a riding type rice transplanter.SOLUTION: The mowing apparatus 100 is composed so as to include a connecting bracket 93 engageably supported on a tip of a lifting and lowering link mechanism 90; a parallel link (a first arm 21 and a second arm 22) in which one end is supported rotatably in the horizontal direction on the connecting bracket 93 and the other end is rotatable within the range from a "front position" or a "rear position" to a "lateral position" of a traveling machine body 10; an urging member 60 for urging the parallel link (the first arm 21 and second arm 22) so as to be held in the "lateral position"; and a cutting mechanism 40 mounted on the other end of the parallel link (the first arm 21 and second arm 22).

Description

  The present invention relates to a mowing apparatus that can be mounted on a mobile agricultural machine.

Conventionally, a mowing apparatus that can be mounted on a traveling machine such as a riding type rice transplanter or a riding type management machine has been known. For example, as described in Patent Document 1.
In the rear part of the traveling machine body of the riding type rice transplanter disclosed in Patent Document 1, an elevating link mechanism for mounting the seedling planting device so as to be movable up and down is provided. The riding type rice transplanter removes the seedling planting device from the tip of the lifting link mechanism and uses it as a mowing device from the viewpoint of making effective use of the traveling machine that was previously used only for rice transplanting. It is configured so that it can be replaced. By attaching the mowing device, it is possible to mow the weeds and the like on the shore surface (the ground surface) from the paddy field side while traveling the traveling machine body according to the strips of seedlings planted in the paddy field. Alternatively, weeds and the like that grow on the side of the farm field can be cut from the farm road side while the traveling machine is traveling along the farm road on the side of the farm field.

  Here, the mowing device disclosed in Patent Document 1 is a connection bracket that is detachably supported at the tip of the lifting link mechanism, and one end portion of which can be rotated in the vertical direction and the horizontal direction with respect to the connection bracket. It is comprised by the parallel link etc. to which a mowing mechanism is attached to the other end while being supported by. By fixing one end of the parallel link to the connection bracket using a fastener, the rotation position of the parallel link is fixed at a predetermined position, and the mowing device projects to the side of the traveling machine body. Fixed.

  However, when the planting line is bent or the shore is bent, the cutting mechanism may be separated from the ground surface or may be strongly pressed against the ground surface. For this reason, there are cases where weeds such as weeds are left behind and the mowing apparatus is damaged. In order to avoid this state, when trying to manually rotate the parallel link in the left-right direction, the operator must look at the side shore direction and cannot concentrate on the steering operation. There was a risk of stepping on the seedlings. In other words, when the distance from the traveling machine body to the ground surface such as the shore surface is not constant, the followability of the mowing mechanism to the ground surface may be reduced.

JP-A-10-75624

  This invention is made | formed in view of the above situations, and makes it a subject to improve the followable | trackability to the ground surface of a cutting mechanism.

A mowing apparatus according to a first aspect of the present invention is a mowing apparatus that can be attached to an elevating link mechanism provided at the front or rear of a traveling machine body of a mobile agricultural machine, and is detachably supported at the tip of the elevating link mechanism. A connecting bracket, one end of which is pivotally supported by the connecting bracket, and a parallel link rotatable in a horizontal direction within a range from a “front position” or a “rear position” to a “side position”; An urging member that urges the parallel link to be held at the “side position” and a cutting mechanism attached to the other end of the parallel link are provided.
Here, the “front position” includes not only the front of the traveling machine body of the mobile farm machine but also the left diagonal front and the right diagonal front. The “rear position” includes not only the rear side of the traveling machine body of the mobile farm machine but also the left diagonal rear and the right diagonal rear. The “side position” includes both the left side and the right side of the mobile farm machine.

A mowing apparatus according to a second aspect of the present invention is a mowing apparatus that can be attached to an elevating link mechanism provided at the front or rear of a traveling machine body of a mobile agricultural machine, and is detachably supported at the tip of the elevating link mechanism. A connecting bracket, one end of which is pivotally supported by the connecting bracket, and a parallel link rotatable in a horizontal direction within a range from a “front position” or a “rear position” to a “side position”; A holding mechanism that selectively holds the parallel link at any one of the “front position”, “rear position”, and “side position”, and a cutting mechanism that is attached to the other end of the parallel link. To do.
Here, the “front position” includes not only the front of the traveling machine body of the mobile farm machine but also the left diagonal front and the right diagonal front. The “rear position” includes not only the rear side of the traveling machine body of the mobile farm machine but also the left diagonal rear and the right diagonal rear. The “side position” includes both the left side and the right side of the mobile farm machine.

  According to a third aspect of the present invention, there is provided the mowing device according to the present invention, wherein the holding mechanism abuts against the parallel link, thereby restricting further rotation of the parallel link in the horizontal direction, the parallel link and the restriction. A biasing member that is interposed between the biasing member and selectively biasing the parallel link toward either one of the “front position” side or the “rear position” side or the “side position” side; Is provided.

  According to a fourth aspect of the present invention, in the mowing apparatus, the urging member has reached the “front position” side or the “rear position” side with respect to the position where the horizontal rotation of the parallel link is greater than the position where the fulcrum is exceeded. In this case, the parallel link is urged toward the “front position” side or the “rear position” side, and the rotation position of the parallel link in the horizontal direction is closer to the “side position” side than the position where the fulcrum is exceeded. When reaching the position, the parallel link is urged toward the “side position” side.

  The present invention has an effect that the followability of the mowing mechanism to the ground surface can be improved.

It is a left view which shows the structure of the riding type rice transplanter with which the mowing apparatus which concerns on 1st embodiment of this invention was mounted | worn. It is a top view which shows the structure of the riding type rice transplanter with which the mowing apparatus which concerns on 1st embodiment of this invention was mounted | worn. It is a perspective view which shows the structure of the connection bracket with which the mowing apparatus which concerns on 1st embodiment of this invention was equipped, and the rotation fixed board. It is a perspective view which shows the structure of the rocking | fluctuation link mechanism with which the mowing apparatus which concerns on 1st embodiment of this invention was comprised. It is a figure which shows typically the structure of the mowing mechanism with which the mowing apparatus which concerns on this invention was equipped, (a) is a left view, (b) is a front view. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the state with which the mowing apparatus which concerns on 1st embodiment of this invention was mounted | worn with the riding type rice transplanter, (a) is a figure which shows the case where a parallel link exists in a "back position", (b) is parallel. It is a figure which shows the case where a link exists in "side position." In the mowing apparatus according to the first embodiment of the present invention, it is a plan view showing that the rotation of the parallel link in the horizontal direction is limited within a predetermined range, (a) is a side position of the parallel link FIG. 8B is a diagram illustrating a state in which the parallel link is rotated to the maximum forward side from the “side position”. It is a top view which shows the state with which the mowing apparatus which concerns on 2nd embodiment of this invention was mounted | worn with the riding type rice transplanter, (a) is a figure which shows the case where a parallel link exists in a "back position", (b) is parallel. It is a figure which shows the case where a link exists in "side position." It is a top view which shows the state which mounted | wore the riding type rice transplanter with the mowing apparatus which concerns on 3rd embodiment of this invention, (a) is a figure which shows the case where a parallel link exists in a "back position", (b) is parallel. It is a figure which shows the case where a link exists in "side position." It is a left view which shows typically the structure of the cutting mechanism which concerns on a modification.

  Below, the whole structure of the rice transplanter 1 with which the mowing apparatus 100 was mounted | worn is demonstrated with reference to FIG.1 and FIG.2.

  The rice transplanter 1 is a mobile farmer that can perform seedling planting work on a paddy field in a state where the operator is on the traveling machine body 10. The rice transplanter 1 is an embodiment of a “mobile farm machine” according to the present invention. In the following description, the forward / backward / left / right / up / down directions are defined with the forward direction of the rice transplanter 1 as “forward”.

  The rice transplanter 1 includes a traveling machine body 10 and the like. A lifting link mechanism 90 is provided at the rear of the traveling machine body 10 of the rice transplanter 1. A seedling planting device (not shown) can be attached to the front end (rear end portion) of the elevating link mechanism 90.

  The traveling machine body 10 is configured by attaching other members to the machine body frame 2 forming a skeleton. The fuselage frame 2 is arranged in a pair of left and right front and rear frames 2a and 2a (see FIG. 2) that are long in the front and rear direction, and perpendicular to the front and rear frames 2a and 2a and between the left and right front and rear frames 2a and 2a. It has a plurality of connecting frames to be connected, a rear frame 2c (see FIG. 1) that extends (stands up) upward from rear ends of the front and rear frames 2a and 2a, and the like.

An engine 3 that constitutes a driving source for the rice transplanter 1 is mounted on the front of the machine body frame 2. The power from the engine 3 is shifted by a transmission mechanism in the transmission case 4 and then transmitted to the front wheels 15 and 15 via a transmission mechanism in the front axle case 5 and a pair of left and right rear axle cases 6 and 6. It is transmitted to the rear wheels 16, 16 via the internal transmission mechanism.
Note that the left and right rear wheels 16, 16 of the present embodiment are constituted by tires having the same shape and size. However, instead of this configuration, the width of the tire on the side on which the mowing apparatus is disposed (one on the left and right sides) may be configured to be wider than the width of the tire on the opposite side (the other side on the left and right). In such a configuration, it is possible to prevent the left and right sides of the traveling machine body from sinking below the traveling surface due to the weight of the mowing apparatus.

  A seat 7 for an operator to sit on is supported at the center of the body frame 2 in plan view. An operation tool such as a handle 8 for steering the rice transplanter 1 and a work lever 9 for operating the lifting link mechanism 90 is provided in front of the seat 7.

  A lifting link mechanism 90 is provided at the rear of the machine body frame 2. As shown in FIG. 1, the elevating link mechanism 90 includes a pair of left and right upper links 91 and 91, a pair of left and right lower links 92 and 92, a rotating arm 94, a hydraulic cylinder 95, and the like.

The pair of upper links 91 and 91 are provided in parallel to each other with an interval in the left-right direction. One end portions (front end portions) of the upper links 91 and 91 are supported on the upper portion of the rear frame 2c so as to be rotatable in the vertical direction with the shaft member 96 as a fulcrum.
The pair of lower links 92 and 92 are provided in parallel to each other with an interval in the left-right direction. One end portions (front end portions) of the lower links 92 and 92 are supported by the lower portion of the rear frame 2c so as to be rotatable in the vertical direction with the shaft member 98 as a fulcrum.
As will be described later, a connecting bracket 93 can be attached to the other ends (rear ends) of the upper links 91 and 91 and the lower links 92 and 92.

As shown in FIG. 1, the rotating arm 94 is a rod-shaped member, and one end (lower end) thereof is fixed between the lower links 92 and 92.
The hydraulic cylinder 95 is an actuator for moving up and down a working machine (the mowing apparatus 100 or the seedling planting apparatus) attached to the lifting link mechanism 90. One end of the hydraulic cylinder 95 is connected to the other end (upper end) of the rotating arm 94. The other end of the hydraulic cylinder 95 is connected to the body frame 2.

  In the lifting link mechanism 90 having such a configuration, when the hydraulic cylinder 95 is extended, the lower links 92 and 92 are rotated downward, and the upper links 91 and 91 are also in a state parallel to the lower links 92 and 92. It is kept and rotated downward. On the other hand, when the hydraulic cylinder 95 is reduced, the lower links 92 and 92 are rotated upward, and the upper links 91 and 91 are also rotated upward while maintaining a state parallel to the lower links 92 and 92. Thus, the elevating link mechanism 90 forms a so-called parallel link mechanism. Accordingly, the plate surfaces of the upper plate 93b and the intermediate plate 93c of the connection bracket 93 are always held in a substantially horizontal state. The configuration of the lifting link mechanism may be, for example, a three-point link type or a two-point link type instead of the above configuration.

<First embodiment>
Below, the structure of the mowing apparatus 100 which concerns on 1st embodiment of this invention is demonstrated in detail with reference to FIGS.
The mowing apparatus 100 is an apparatus that can be attached to the rear end (front end) of the elevating link mechanism 90, and can be attached instead of the seedling planting apparatus. By attaching the mowing apparatus 100 to the rice transplanter 1, weeds and the like that grow on the shore, the bank, the side of the farm road, etc. can be cut by the mowing apparatus 100 while the operator runs the traveling machine body 10.
The mowing apparatus 100 includes a machine base 11, a mowing engine 12, a hydraulic pump 13, a hydraulic oil tank 14, a connection bracket 93, a parallel link mechanism 20, a swing link mechanism 30, a mowing mechanism 40, and a regulating member 50 (see FIG. 2). And an urging member 60 (see FIG. 2).

The machine base 11 is attached to the rear part of the machine body frame 2. The machine base 11 is detachably fixed to the upper portion of the rear frame 2c via a pair of left and right mounting stays 18 and 18 and the like. An operating tool mounting bracket is fixed to the right mounting stay 18, and a cutting lever 17 or the like that is an operating tool for operating the mowing apparatus 100 is mounted on the operating tool mounting bracket.
The mowing engine 12 is a driving source of the mowing apparatus 100 and is placed on the right side of the machine base 11. More specifically, the harvesting engine 12 is arranged so that its output shaft protrudes to the left, and the output shaft and a drive shaft of a hydraulic pump 13 (described later) are connected.

  The hydraulic pump 13 is a pump driven by the cutting engine 12 and is placed on the left side of the machine base 11. The hydraulic oil tank 14 is a tank that stores hydraulic oil, and is provided on the left side of the machine base 11 and above the hydraulic pump 13 via an attachment frame 19. The suction port of the hydraulic pump 13 communicates with the hydraulic oil tank 14 through a pipe. The discharge port of the hydraulic pump 13 communicates with the switching valve 170 through a pipe. By operating the mowing lever 17, the switching valve 170 can be opened and closed to switch the oil supply direction of the hydraulic oil from the hydraulic pump 13. Specifically, when the cutting lever 17 is set to “ON”, the hydraulic oil from the hydraulic pump 13 is fed to the hydraulic motor 43 of the cutting mechanism 40, and when the cutting lever 17 is set to “OFF”, the hydraulic pump The hydraulic oil from 13 is sent to the hydraulic oil tank 14.

  As shown in FIG. 3, the connection bracket 93 is supported by the front end (rear end portion) of the elevating link mechanism 90. By detaching the upper connecting pin 97 and the lower connecting pin 99, the connecting bracket 93 can be engaged with and disengaged from the upper links 91 and 91 and the lower links 92 and 92. The connection bracket 93 is a substantially F-shaped member when viewed from the left side, and includes a front vertical frame 93a, an upper plate 93b, an intermediate plate 93c, and the like.

  The front vertical frame 93a is connected (axially supported) to the rear end portions of the upper links 91 and 91 and the rear end portions of the lower links 92 and 92 via the upper connection pins 97 and the lower connection pins 99. The upper plate 93b is fixed to the upper end portion of the front vertical frame 93a in a state where the plate surface is substantially horizontal. The intermediate plate 93c is fixed to the upper part of the front vertical frame 93a in a state where the plate surface is substantially horizontal. Between the lower surface of the upper plate 93b and the upper surface of the intermediate plate 93c, one end portion of the first arm 21 described later and a part of the rotation fixing plate 24 are accommodated (fitted).

  The parallel link mechanism 20 supports the reaping mechanism 40 so that the reaping mechanism 40 is movable in a horizontal plane in a state where the orientation of the reaping mechanism 40 is held in a fixed direction (front-rear direction). 2 and 3, the parallel link mechanism 20 includes a first arm 21, a second arm 22, a rotation shaft 23, a rotation shaft 26, a rotation fixing plate 24, and the like. Here, the combination of the first arm 21 and the second arm 22 is an embodiment of the “parallel link” according to the present invention.

  The first arm 21 is a long rod-shaped member. One end portion of the first arm 21 is rotatably supported (axially supported) on the right front end portion of the connection bracket 93 via the rotation shaft 23. Here, the rotation shaft 23 has a through-hole formed in the right front end portion of the connection bracket 93 and a through-hole formed in one end portion of the first arm 21 with the axial direction thereof directed in the vertical direction. , Is inserted.

  The second arm 22 is a long rod-like member having substantially the same shape as the first arm 21. A rotation fixing plate 24 is fixed to one end of the second arm 22. The second arm 22 is supported (supported) on the right rear end portion of the connection bracket 93 via the rotation fixing plate 24 and the rotation shaft 26. The first arm 21 and the second arm 22 are provided in parallel to each other. Here, the rotation shaft 26 is formed in the through hole formed in the right rear end portion of the connection bracket 93 and the fan-shaped center portion of the rotation fixing plate 24 with the axial direction thereof directed in the vertical direction. And inserted into the through-hole.

  The shaft member 27 shown in FIG. 6A is a fastening for fixing the rotation position in the horizontal direction about the rotation shaft 26 of the rotation fixing plate 24 (second arm 22) to a predetermined position. It is a tool. The shaft member 27 of the present embodiment is a substantially cylindrical member having a screw formed on the outer peripheral surface, and the axis is directed in the vertical direction.

The rotation fixing plate 24 shown in FIG. 3 is a generally fan-shaped plate material. Through holes 24h, 24h,... Are formed at predetermined intervals on the periphery of the rotation fixing plate 24 (the arcuate portion of the fan).
The screw holes 93h formed in the connection bracket 93 and the through holes 24h, 24h,. The shaft member 27 is inserted (screwed) into 24h. With such a configuration, the rotation position of the rotation fixing plate 24 with respect to the connection bracket 93 is fixed.

  When the shaft member 27 is removed from the connection bracket 93 and the rotation fixing plate 24, the rotation fixing plate 24 (second arm 22) is in a state of being rotatable with respect to the connection bracket 93 in the horizontal direction. That is, by attaching and detaching the shaft member 27, the rotation position of the second arm 22 with respect to the connection bracket 93 can be fixed to a predetermined position, and the second arm 22 can be rotated with respect to the connection bracket 93. You can also

  The swing link mechanism 30 supports the cutting mechanism 40 so as to be swingable at the tip end portion (the end portion opposite to the connection bracket 93) of the parallel link mechanism 20. The swing link mechanism 30 is interposed between the tip portions of the first arm 21 and the second arm 22 and the cutting mechanism 40. As shown in FIG. 4, the swing link mechanism 30 includes a bracket 31, a lower end bracket 32, a third arm 33, a fourth arm 34, stays 35 and 36, a rotation shaft 37, and the like.

The bracket 31 shown in FIG. 4 is a member formed by bending a plate material, and has an upper surface 31a, a lower surface 31b, a side surface 31c, a vertical surface 31d, and the like.
The plate surfaces of the upper surface 31a and the lower surface 31b are substantially horizontal. The side surface 31c is a portion formed by vertically bending a part of the upper surface 31a downward. The vertical surface 31d is a portion formed by vertically bending a part of the lower surface 31b. The plate surface of the side surface 31c and the plate surface of the vertical surface 31d are parallel to each other.

  The front right end portion of the bracket 31 is rotatably supported (axially supported) on the other end portion of the first arm 21 via the shaft member 311. The left end portion of the bracket 31 is rotatably supported (axially supported) on the other end portion of the second arm 22 via the shaft member 312. A combination of the connecting bracket 93, the first arm 21, the second arm 22, the bracket 31, and the like constitutes a so-called parallel link mechanism. Therefore, the first arm 21 and the second arm 22 are always held in a mutually parallel state. Similarly, the side surface 31c and the vertical surface 31d of the bracket 31 are always held in a state substantially perpendicular to the left-right direction.

  The lower end bracket 32 connects the lower ends of the third arm 33 and the fourth arm 34 to the stays 35 and 36. The lower end bracket 32 of the present embodiment is a member formed by bending a rectangular plate material into a U-shape when viewed from the front.

  The third arm 33 is a long rod-shaped member. One end (upper end) of the third arm 33 is fitted between the side surface 31 c and the vertical surface 31 d of the bracket 31. The third arm 33 is supported (axially supported) on the front end portion of the bracket 31 via the shaft member 330 so as to be rotatable in the front-rear direction. The other end (lower end) of the third arm 33 is fitted to the front end of the lower end bracket 32. The third arm 33 is supported (axially supported) on the front end portion of the lower end bracket 32 through the shaft member 331 so as to be rotatable in the front-rear direction. The shaft member 330 and the shaft member 331 are parallel to each other.

  The fourth arm 34 is a long bar-like member having the same shape as the third arm 33. One end (upper end) of the fourth arm 34 is fitted between the side surface 31 c and the vertical surface 31 d of the bracket 31. The fourth arm 34 is supported (axially supported) on the rear end portion of the bracket 31 via the shaft member 340 so as to be rotatable in the front-rear direction. The other end (lower end) of the fourth arm 34 is fitted to the rear end of the lower end bracket 32. The fourth arm 34 is supported (axially supported) on the rear end portion of the lower end bracket 32 through the shaft member 341 so as to be rotatable in the front-rear direction. The shaft member 340 and the shaft member 341 are parallel to each other.

  The stays 35 and 36 are members that connect the cutting mechanism 40 to the lower end bracket 32. The stays 35 and 36 are fixed to the lower portion of the lower end bracket 32 and project rightward and downward. The stays 35 and 36 are supported by a support body 49 via a rotation shaft 37 whose axis extends in the front-rear direction. The support body 49 is fixed on the right cutting cover 41R.

  The cutting mechanism 40 shown in FIG. 5 is an apparatus for performing an operation (mowing) for cutting weeds and the like growing on a shore or a farm road (the ground surface). The cutting mechanism 40 includes left and right cutting covers 41L and 41R, left and right cutting blades housed inside the cutting covers 41L and 41R, a hydraulic motor 43 that rotationally drives the left and right cutting blades, a cover rotating shaft 44, a front A gauge wheel 45, a roller 46, a gauge wheel 47, and rubber sag 48L / 48C / 48R are provided.

The cutting cover of the present embodiment is divided into left and right parts. The left reaping cover 41L can be turned up and down with respect to the right reaping cover 41R about the cover turning shaft 44 as a fulcrum, and can be fixed at an appropriate turning position.
With such a configuration, the left and right cutting blades can follow an inclined surface such as a slope. For example, a usage mode is possible in which mowing on the slope of the shore is performed in a state in which the left half and the right half of the mowing mechanism 40 are arranged in one plane (on the same plane). Alternatively, it is possible to use a method in which mowing is performed on the upper surface of the ridge by the right half of the mowing mechanism 40, and simultaneously, mowing on the slope of the shore is performed by the left half of the mowing mechanism 40.

  The left and right cutting blades (not shown) are blade-type rotary blades. The left cutting blade is fixed to the lower end of a left rotation shaft that is rotatably provided in the left cutting cover 41L. The right cutting blade is fixed to the lower end of a right rotating shaft that is rotatably provided in the right cutting cover 41R. The left rotating shaft and the right rotating shaft are connected to each other via a bevel gear and a retractable drive shaft 42. The cutting blade is not limited to a blade type, and may be a clipper type or a reel type, for example.

A hydraulic motor 43 shown in FIG. 5A is a motor for driving the cutting blade to rotate. The hydraulic motor 43 is mounted on the right cutting cover 41R. The output shaft of the hydraulic motor 43 is disposed so as to protrude to the left side, and the output shaft and the drive shaft of the cutting blade are connected. With such a configuration, when the cutting lever 17 is set to “ON”, the hydraulic motor 43 is driven by feeding hydraulic oil from the hydraulic pump 13 and the cutting blade is driven to rotate.
However, the mode of driving the cutting blade is not limited to the above-described one. For example, the hydraulic motor 43 is placed on the machine base 11, and the output shaft of the hydraulic motor 43 and the driving shaft of the cutting blade are flexible wires. The cutting blades may be driven by being connected with each other. Alternatively, it is configured not to include a hydraulic motor, and a clutch or a transmission mechanism is connected to the output shaft of the cutting engine, and the cutting blade is driven by connecting the output shaft of the transmission mechanism and the driving shaft of the cutting blade with a flexible wire. It is good also as composition to do.

  The front gauge wheel 45, the roller 46 (see FIG. 5A), and the gauge wheel 47 (see FIG. 5B) adjust the height of the cutting blade with respect to the ground surface as appropriate. The front gauge wheel 45 is attached to an attachment portion provided on the right cutting cover 41R so that the height can be adjusted. The roller 46 is attached to the rear end portion of the right mowing cover 41R via an attachment stay. The gauge ring 47 is attached to an attachment part provided at the front part of the left cutting cover 41L so that the height can be adjusted. As the front gauge wheel 45, the roller 46, and the gauge wheel 47 roll on the ground surface, the cutting mechanism 40 is smoothly moved along the ground surface.

It is also possible to adopt a configuration in which the weight can be attached to the cutting mechanism 40 by forming a weight (weight) attachment portion on the left cutting cover 41L. In such a configuration, when the slope on the shore is a steep slope, the left gauge ring 47 is pressed against the slope by attaching the weight, and the followability of the cutting mechanism 40 to the ground surface is improved. Can be achieved.
Alternatively, by adding a biasing member that biases the left and right cutting covers 41L and 41R so as to rotate in directions away from each other (spreading direction) with the cover rotation shaft 44 as a fulcrum, the ground surface of the cutting mechanism 40 is added. It is also possible to improve the adhesiveness to the skin.

  The rubber sag 48L / 48C / 48R shown in FIG. 5 (b) prevents pebbles and the like jumped up by the rotation of the cutting blades from being scattered around the cutting mechanism 40. The left rubber droop 48L is hung from the front left end of the left cutting cover 41L and covers the left cutting blade and the gauge ring 47L from the front. The right rubber sag 48R is hung from the front right end of the right cutting cover 41R and covers the right cutting blade and the gauge ring 47R from the front. The rubber sag 48C is disposed between the left and right rubber sag 48L and 48R, and is suspended between the front gauge wheel 45 and the gauge wheel 47.

In addition, as shown to Fig.5 (a), the front-end part of the cutting cover (cutting mechanism 40) of this embodiment is formed so that it may leave | separate (become high) from the ground surface toward the front. In other words, the front end portion of the cutting cover has a large opening shape. With this configuration, weeds and the like are easily guided into the mowing mechanism 40.
However, the shape of the cutting cover is not limited to the above-described one. For example, the rear end portion of the cutting cover may have a large opening shape like the front end portion. When comprised in this way, it can prevent that the weeds etc. which were cut off remain in the inside of a cutting mechanism.

  In the mowing apparatus 100 configured as described above, the parallel link (the first arm 21 and the second arm 22) is changed from the “rear position” (see FIG. 6A) to the “side position” (FIG. 6B). ))) (Strictly, the cutting mechanism 40 can be rotated within a range up to a position where the cutting mechanism 40 is located directly beside the traveling machine body 10).

Here, the “rear position” is a position where the parallel links are arranged when the rice transplanter 1 is moved to another farm field or traveled on a road. In the “rear position” of the present embodiment, the first arm 21 and the second arm 22 extend rearward of the traveling machine body 10.
In the mowing apparatus 100 of the present embodiment, the shaft member 27 is inserted into the fourth through hole 24h from the left in FIG. 6A of the through holes 24h, 24h,. By screwing into the screw hole 93h, the position of the parallel link can be firmly fixed to the “rear position”.

On the other hand, the “side position” is a position where the parallel links are arranged when weeding the weeds growing on the ground surface such as a shore. More specifically, in the “side position” of the present embodiment, the first arm 21 and the second arm 22 extend to the right side of the traveling machine body 10. Specifically, at the “side position”, the other end of the first arm 21 (the end opposite to the connection bracket 93) and the other end of the second arm 22 (the opposite of the connection bracket 93). The end portion on the side is disposed on the right side of the traveling machine body 10, and the mowing device 100 (the mowing mechanism 40) is held in a posture protruding to the right side of the traveling machine body 10.
When the shaft member 27 is detached from the rotation fixing plate 24 and the connection bracket 93, the rotation positions of the first arm 21 and the second arm 22 are changed to “side positions” by an urging force received from an urging member 60 described later. Is held.

  Below, the urging | biasing member 60 * 60, the limitation member 50, and the structure of these members periphery are demonstrated in detail with reference to FIG.3, FIG.6 and FIG.7.

The urging members 60 and 60 shown in FIG. 3 urge the parallel links so as to hold them in the “side position”. The urging members 60 and 60 of the present embodiment are tension coil springs, and include a spring seat 51 extending from the connection bracket 93 via the restriction member 50 and a spring seat 52 extending from the second arm 22. It is interposed (intervened) between them.
In addition, in the mowing apparatus 100 of this embodiment, the two urging | biasing members 60 * 60 are comprised, and one is arrange | positioned above the said parallel link and the other is arrange | positioned below the said parallel link. However, the number of urging members in the present invention is not limited to two, and may be one, or may be configured to include three or more. In the following description, one of the two urging members will be mainly described.

The spring seat 51 shown in FIG. 3 is a structure that supports one end (front end) of the urging members 60 and 60, and is formed by bending a plate material. The spring seat 51 of the present embodiment is fixed to the right end portion of a restriction member 50 (described later) fixed to the connection bracket 93 and extends (projects) upward and downward of the restriction member 50.
The spring seat 52 shown in FIG. 3 is a structure that supports the other end portions (rear end portions) of the urging members 60 and 60, and is formed by bending a plate material. The spring seat 52 of the present embodiment is fixed to the middle part of the second arm 22 and extends (protrudes) above and below the second arm 22.

In the “side position” (see FIG. 6B), the urging members 60 and 60 urge the second arm 22 in a direction to rotate counterclockwise in plan view with the rotation shaft 26 as a fulcrum. ing. In other words, when the mowing operation is performed at the “side position”, the second arm 22 is given a counterclockwise moment in plan view with respect to the rotation shaft 26 by the urging force received from the urging members 60 and 60. ing.
In this embodiment, two urging members 60 are attached to the upper and lower portions (upper and lower sides of the parallel links) of the spring seats 51 and 52, but the number and position of the urging members 60 are not limited thereto. Absent. Therefore, in order to adjust the urging force of the urging member 60, the number of urging members attached can be changed. Moreover, it can also comprise so that a connection position (position of the spring seats 51 * 52) can be changed so that urging | biasing force can be adjusted.

  The regulating member 50 regulates further rotation of the parallel link in the horizontal direction by contacting the parallel link (the first arm 21 or the second arm 22).

  The restriction member 50 of the present embodiment is a long bar-like member formed by bending a plate material, and has an upper surface portion 50a and a rear surface portion 50b. The plate surface of the upper surface portion 50a is substantially horizontal, and the rear end portion thereof is bent vertically downward to form the rear surface portion 50b. The rear surface portion 50b forms a plane perpendicular to the front-rear direction. The restriction member 50 is fixed to the upper end portion of the connection bracket 93 with the right end portion extending (protruding) to the right side of the connection bracket 93. The rear surface portion 50 b of the restriction member 50 forms a surface (contact surface) that contacts the front end surface of the first arm 21.

  Since the mowing apparatus 100 of the present embodiment is configured as described above, the following operations are realized.

As shown in FIG. 6A, the screw holes 93h (see FIG. 3) formed in the connecting bracket 93 and the through-holes 24h formed in the rotation fixing plate 24 are overlapped to form these screw holes. When the shaft member 27 is inserted (screwed) into the 93h and the through hole 24h, the rotation position of the second arm 22 in the horizontal direction is fixed. In this state, the urging members 60 and 60 are removed from the mowing apparatus 100 (spring seats 51 and 52).
At this time, the second arm 22 extends rearward of the traveling aircraft body 10, and the first arm 21 also extends rearward of the traveling aircraft body 10 while maintaining a state parallel to the second arm 22. Therefore, the cutting mechanism 40 is disposed (withdrawn) behind the traveling machine body 10, and the lateral width (dimension in the left-right direction) of the combined traveling machine body 10 and the mowing apparatus 100 becomes compact. Therefore, the rice transplanter 1 (movable agricultural machine) can be easily traveled on a road having a narrow road width without the mowing device 100 being in the way.

  On the other hand, when the shaft member 27 is removed from the mowing apparatus 100 in the state shown in FIG. 6A, the second arm 22 is rotatable in the horizontal direction with the rotation shaft 26 as a fulcrum. In this state, the mowing device 100 is threaded through the screw hole 93h formed in the connection bracket 93 at a desired rotation position between the “rear position” and the “lateral position”, and the through hole formed in the rotation fixing plate 24. By superimposing the hole 24h and penetrating (screwing) the shaft member 27, the mowing apparatus 100 can be fixed at a desired position and the mowing operation can be performed. In addition, when the rotation position of the parallel link is fixed in this way, it is not necessary to urge the urging member 60 to the “side position” side, and the urging member 60 is loaded. Since it is desirable to prevent this, the biasing member 60 is removed from the spring seat 51 or the spring seat 52.

  When the work is performed at the “side position” shown in FIG. 6B, the biasing member 60 is connected to the spring seat 51 and the spring seat 52. In this connected state, the parallel link is urged by the urging force of the urging member 60 so as to rotate forward (the “side position” side). At this time, the first arm 21 and the second arm 22 extend slightly rearward from the side (right side) of the traveling machine body 10. Therefore, the cutting mechanism 40 is disposed on the right side of the traveling machine body 10 (strictly, slightly behind the right side). That is, the mowing apparatus 100 is in a posture projecting to the right side of the traveling machine body 10, and the tip (other end part) of the parallel link extending from the traveling machine body 10 (rice transplanter 1) reaches the ground surface. It becomes.

  As described above, the parallel link ranges from the “rear position” where the cutting mechanism 40 is retracted to the rear of the traveling machine body 10 to the “side position” where the cutting mechanism 40 projects to the right side of the traveling machine body 10. The posture can be changed inside.

  Further, when the parallel link is rotated a little further forward than the “lateral position” (see FIG. 7A), the rear surface portion 50 b of the regulating member 50, the front end surface of the first arm 21, Are in contact with each other (see FIG. 7B). Thereby, the further counterclockwise rotation (front side) of the first arm 21 in a plan view is restricted. In the present embodiment, the first arm 21 is configured to abut against the regulating member 50 when the longitudinal directions of the first arm 21 and the second arm 22 coincide with the left-right direction. With such a configuration, the restricting member 50 restricts the parallel link from rotating to the front side rather than the right side (right side) of the traveling machine body 10.

  Below, the effect show | played when implementing mowing using the mowing apparatus 100 of such a structure is demonstrated.

When the shaft member 27 is removed and the urging member 60 is mounted in order to mow using the mowing apparatus 100, the rotation position of the parallel link (second arm 22) is determined by the urging member 60. It is held at the “side position” by the urging force received from (see FIG. 6B).
And when mowing, the planting machine 1 travels along the seedling planting line in the paddy field, so if the planting line is bent or the shore is bent, the traveling direction is bent. There is. That is, the distance from the traveling machine body 10 to the ground surface such as the shore changes (not constant).
In such a case, when the traveling machine body 10 approaches the shore, the cutting mechanism 40 is pressed against the slope of the shore, but the parallel link (parallel link mechanism 20) resists the urging force of the urging member 60. Then, since it is rotated backward ("rear position" side), it can be avoided that a large load is applied.
On the contrary, when the traveling machine body 10 tries to move away from the shore, the parallel link (parallel link mechanism 20) is rotated forward ("side position" side) by the urging force of the urging member 60. The mechanism 40 is pressed against the slope side of the shore. That is, when the mowing mechanism 40 is about to be separated from the shore, the position of the parallel link is automatically returned to the “side position”.

Thus, by rotating the parallel link in the horizontal direction in accordance with the change in the distance from the traveling machine body 10 to the shore (ground surface), it is possible to prevent the cutting mechanism 40 from being separated from the ground surface. It is possible to improve the followability of the mowing mechanism 40 to the ground surface. Therefore, the operator does not need to pay special attention to adjusting the position (posture) of the harvesting mechanism 40, and can concentrate on the steering operation of the rice transplanter 1.
Further, when the urging member 60 expands and contracts, it can be avoided that a large impact load is applied to the members constituting the parallel link mechanism 20 and the swing link mechanism 30. Therefore, the first arm 21 and the second arm 22 can be prevented from being deformed or damaged by an external force received from the ground surface.

  Furthermore, when mowing is finished and the mowing mechanism 40 is raised, an external force is not suddenly applied to the parallel link. In this case, the second arm 22 is pulled by the biasing member 60 and pivots forward, but the front surface of the first arm 21 abuts against the regulating member 50 (FIG. 6B). It will not rotate forward. Therefore, the cutting mechanism 40 does not suddenly rotate toward the traveling machine body 10 to damage the traveling machine body 10, and the weight balance is not greatly lost.

As described above, the mowing apparatus 100 according to the first embodiment of the present invention is a mowing apparatus that can be attached to the elevating link mechanism 90 provided at the rear portion of the traveling machine body 10 of the rice transplanter 1. A connecting bracket 93 that is detachably supported at the tip, and one end portion is pivotally supported by the connecting bracket 93, and in the horizontal direction within the range from the "front position" or "rear position" to the "side position". A rotatable parallel link (first arm 21 and second arm 22) and a biasing member that biases the parallel links (first arm 21 and second arm 22) so as to be held in a "side position". 60 and a mowing mechanism 40 attached to the other end of the parallel link (the first arm 21 and the second arm 22).
Therefore, the parallel link (the first arm 21 and the second arm 22) can be held at the “side position” by the biasing force received from the biasing member 60. Here, the parallel links (the first arm 21 and the second arm 22) in the “side position” can be rotated in the horizontal direction in the vicinity of the “side position” by the expansion and contraction of the biasing member 60. It is. As a result, the followability of the mowing mechanism 40 to the ground surface can be improved.

Further, in the mowing apparatus 100 according to the first embodiment of the present invention, the parallel link (the first arm 21 and the second arm 22) is on the opposite side (front) from the “rear position” with respect to the “side position”. Further, a restricting member 50 for restricting a large rotation is further provided.
Therefore, the position of the parallel link (the first arm 21 and the second arm 22) can be held in the vicinity of the “side position”. In the present embodiment, since the parallel link is restricted from rotating to the front side from the right side (straight side) of the traveling machine body 10, the parallel link is smoothly rotated without being replaced in the middle. The

<Second embodiment>
Below, the mowing apparatus 200 which concerns on 2nd embodiment of this invention is demonstrated in detail with reference to FIG.
The mowing apparatus 200 includes (1) a biasing member 75 instead of the biasing member 60, (2) spring springs 71 and 72 instead of the spring seats 51 and 52, and (3) a regulating member 73. Furthermore, it is different from the mowing apparatus 100 according to the first embodiment in that it is provided.

  In the following, among members constituting the mowing apparatus 200, members that are substantially the same as the members provided in the mowing apparatus 100 in terms of shape, material, and function are denoted by the same reference numerals, and detailed description thereof is omitted. To do. The combination of the regulating members 50 and 73 and the urging member 75 constitutes a holding mechanism 70 that is an embodiment of the “holding mechanism” according to the present invention.

The urging member 75 is configured so that the parallel link (the first arm 21 and the second arm 22) is either “rear position” (see FIG. 8A) or “side position” (see FIG. 8B). It is biased so as to be selectively held at one position. More specifically, the biasing member 75 of this embodiment is a tension coil spring, and is between a spring seat 71 extended from the restriction member 50 and a spring seat 72 extended from the first arm 21. Is interposed (intervened).
In the mowing apparatus 200 according to the present embodiment, two urging members 75 and 75 are provided on the upper and lower sides as in the mowing apparatus 100 according to the first embodiment. I will mainly explain one.

The spring seat 71 is a structure that supports one end (front end) of the biasing member 75 and is formed by bending a plate material. The spring seat 71 of the present embodiment is fixed to a substantially central portion on the left and right sides of the restriction member 50 fixed to the connection bracket 93 and extends (protrudes) above and below the restriction member 50.
The spring seat 71 and one end of the biasing member 75 are connected at a connection point A. More specifically, one end of the biasing member 75 is hooked in a through hole formed in the spring seat 71.

The spring seat 72 is a structure that supports the other end portion of the urging member 75 and has a shape in which a columnar shaft is fixed to a plate member. The spring seat 72 of this embodiment is fixed to the middle part of the first arm 21, and the shaft extends (protrudes) above and below the first arm 21.
The spring seat 72 and the other end of the biasing member 75 are connected at a connection point B. More specifically, the other end of the urging member 75 is hooked on the shaft provided on the spring seat 72.

  As shown in a plan view in FIG. 8A, when the connection point B is arranged behind the straight line L connecting the connection point A and the center of the rotating shaft 23, the biasing member 75 is a spring seat. The first arm 21 is urged via 72 in the direction of rotating clockwise about the rotation shaft 23 ("rear position" side). On the other hand, when the connection point B is arranged in front of a straight line L connecting the connection point A and the center of the rotation shaft 23 as shown in a plan view in FIG. The first arm 21 is urged via the spring seat 72 in a direction (“lateral position” side) that rotates counterclockwise in plan view with the rotation shaft 23 as a fulcrum. That is, the direction in which the urging member 75 urges the first arm 21 with respect to a point where the connection point A, the connection point B, and the center of the rotation shaft 23 are in a straight line is a boundary (dead point). It is comprised so that it may become an opposite direction. The position of the parallel link (the first arm 21 and the second arm 22) when the connection point B is arranged on the straight line L corresponds to the “position where the fulcrum is exceeded” according to the present invention.

  Since the mowing apparatus 200 of the present embodiment includes the holding mechanism 70 configured as described above, the following operation is realized.

  As shown in FIG. 8A, when the connection point B is arranged behind the straight line L, the horizontal rotation position of the first arm 21 is “rear position” by the urging force received from the urging member 75. Retained. At this time, the first arm 21 is extended to the rear of the traveling machine body 10, and the second arm 22 is also maintained in a state parallel to the first arm 21, and the rear of the traveling machine body 10 (strictly, slightly behind the back of the traveling machine body 10. It extends to the right. Therefore, the cutting mechanism 40 is disposed behind the traveling machine body 10, and the combined width of the traveling machine body 10 and the mowing apparatus 200 is compact.

On the other hand, when the parallel link in the state shown in FIG. 8A is manually rotated to move the connection point B to a position in front of the straight line L, the first arm 21 is moved from the urging member 75. The second arm 22 also rotates counterclockwise in plan view while maintaining a state parallel to the first arm 21 in accordance with the biasing force received.
Then, the rotation of the parallel link is stopped at the point where the “side position” shown in FIG. At this time, the first arm 21 and the second arm 22 extend slightly rearward from the side (right side) of the traveling machine body 10. Therefore, the cutting mechanism 40 is disposed on the right side of the traveling machine body 10 (strictly, slightly behind the right side). In other words, the mowing apparatus 200 has a posture that protrudes to the right side of the traveling machine body 10.

  Thus, in the mowing apparatus 200 of the present embodiment, the position of the parallel link can be stably held at the “rear position” or the “lateral position” without using a fastener such as the shaft member 27 or the like. it can. Therefore, the posture change of the mowing apparatus 200 can be easily performed.

  Moreover, in this embodiment, the control member 50 which controls the further forward rotation of the parallel link by contacting the parallel link (first arm 21) is provided. Specifically, the rear surface portion 50b of the regulating member 50 and the front end surface of the first arm 21 are configured to be in contact with each other. With such a configuration, the parallel link is restricted from rotating to the front side from the right side (straight side) of the traveling machine body 10.

Further, in the present embodiment, there is provided a regulating member 73 that abuts on the parallel link (second arm 22) to regulate the further backward rotation of the parallel link. The restriction member 73 is provided so as to protrude forward from above the intermediate plate 93 c of the connection bracket 93, and can contact the rear surface of the second arm 22.
The second arm 22 is configured such that the right side surface portion of the restricting member 73 and the second arm 22 come into contact with each other when the second arm 22 has rotated a little further to the rear side than the “rear position”. Thereby, the further rotation of the second arm 22 in the clockwise direction in the plan view (rear side) is restricted. In the present embodiment, the first arm 21 and the second arm 22 are configured such that the second arm 22 abuts on the restriction member 73 when the longitudinal directions of the first arm 21 and the second arm 22 coincide with the front-rear direction.

As described above, the mowing apparatus 200 according to the second embodiment of the present invention is a mowing apparatus that can be attached to the elevating link mechanism 90 provided in the rear portion of the traveling machine body 10 of the rice transplanter 1. A connecting bracket 93 that is detachably supported at the tip, and one end portion is pivotally supported by the connecting bracket 93, and in the horizontal direction within the range from the "front position" or "rear position" to the "side position". The rotatable parallel link (first arm 21 and second arm 22) and the parallel link (first arm 21 and second arm 22) are positioned at either one of “rear position” or “side position”. And a mowing mechanism 40 attached to the other end of the parallel link (the first arm 21 and the second arm 22).
Accordingly, the parallel links (the first arm 21 and the second arm 22) can be stably held at one of the “side position” and the “rear position”.

Further, the holding mechanism 70 provided in the mowing apparatus 200 according to the second embodiment of the present invention abuts on the parallel link (the first arm 21 or the second arm 22), thereby the parallel link (the first arm 21). 21 and the second arm 22) between the regulating members 50 and 73 for regulating the further rotation in the horizontal direction and the parallel link (the first arm 21 or the second arm 22) and the regulating member 50. And a biasing member 75 that selectively biases the parallel links (the first arm 21 and the second arm 22) to either the “rear position” side or the “side position” side; Is provided.
Therefore, the holding mechanism 70 can be realized with a simple configuration.

Further, in the urging member 75 provided in the mowing apparatus 200 according to the second embodiment of the present invention, the rotation position in the horizontal direction of the parallel links (the first arm 21 and the second arm 22) is such that the fulcrum is exceeded. When the “rear position” side is reached from the generated position, the parallel links (first arm 21 and second arm 22) are urged toward the “rear position” side, and the parallel links (first arm 21 and When the rotational position of the second arm 22) in the horizontal direction reaches the “side position” side of the position where the fulcrum is exceeded, the parallel links (first arm 21 and second arm 22) are moved. It is biased toward the “side position” side.
Therefore, the holding mechanism 70 can be realized with a simple configuration utilizing the fulcrum of the biasing member 75. Here, the parallel links (the first arm 21 and the second arm 22) in the “side position” can be rotated in the horizontal direction in the vicinity of the “side position” by the expansion and contraction of the biasing member 75. It is. As a result, the parallel links (the first arm 21 and the second arm 22) can be rotated in the horizontal direction in accordance with the change in the distance from the traveling machine body 10 to the shore (the ground surface). The followability to the ground surface can be improved.

<Third embodiment>
Below, the mowing apparatus 300 which concerns on 3rd embodiment of this invention is demonstrated with reference to FIG.
The mowing apparatus 300 includes (1) a biasing member 85 instead of the biasing member 75, (2) a spring seat 81 instead of the spring seat 71, and (3) a sliding shaft member 84. This is different from the mowing apparatus 200 according to the second embodiment.

  In the following, among members constituting the mowing apparatus 300, members that are substantially the same as those provided in the mowing apparatus 200 in terms of shape, material, and function are denoted by the same reference numerals, and detailed description thereof is omitted. To do. The combination of the regulating members 50 and 73 and the urging member 85 constitutes a holding mechanism 80 that is an embodiment of the “holding mechanism” according to the present invention.

  The urging member 85 is configured so that the parallel link (the first arm 21 and the second arm 22) is either “rear position” (see FIG. 9A) or “side position” (see FIG. 9B). It is biased so as to be selectively held at one position. More specifically, the biasing member 85 of this embodiment is a tension coil spring, and is between a spring seat 81 extending from the restriction member 50 and a spring seat 72 extending from the first arm 21. Is interposed (intervened).

  The spring seat 81 is a structure that supports one end (front end) of the biasing member 85, and is formed by bending a plate material. The spring seat 81 of the present embodiment is fixed to the restriction member 50 fixed to the connection bracket 93 and extends (protrudes) above the restriction member 50. A substantially horizontal plate surface is formed at the upper end of the spring seat 81. On the plate surface, a guide groove 81h extending in a direction inclined approximately 30 degrees with respect to the left-right direction is formed.

The sliding shaft member 84 is a cylindrical member. The sliding shaft member 84 is fitted in the guide groove 81h of the spring seat 81 so as not to fall off. The upper and lower ends of the sliding shaft member 84 protrude from the spring seat 81, and one end (front end) of the biasing member 85 is connected. That is, the sliding shaft member 84 (the center thereof) forms a connection point C between the spring seat 81 and the biasing member 85.
In addition, the other end part (rear end part) of the urging member 85 is connected to the spring seat 72 similarly to the mowing apparatus 200 according to the second embodiment. That is, the axis (center) of the spring seat 72 forms a connection point D between the spring seat 72 and the biasing member 85.

  As shown in a plan view in FIG. 9A, when the connection point D is arranged behind the straight line M connecting the connection point C and the center of the rotation shaft 23, the biasing member 85 is a spring seat. The first arm 21 is urged via 72 in the direction of rotating clockwise about the rotation shaft 23 ("rear position" side). On the other hand, when the connection point D is arranged in front of a straight line M connecting the connection point C and the center of the rotation shaft 23 as shown in a plan view in FIG. The first arm 21 is urged via the spring seat 72 in a direction (“lateral position” side) that rotates counterclockwise in plan view with the rotation shaft 23 as a fulcrum. That is, the direction in which the urging member 85 urges the first arm 21 with respect to a boundary (dead point) where the connection point C, the connection point D, and the center of the rotation shaft 23 are in a straight line is mutually. It is comprised so that it may become an opposite direction. The position of the parallel link (the first arm 21 and the second arm 22) when the connection point C and the connection point D are arranged on the straight line L corresponds to the “position where the fulcrum is exceeded” according to the present invention.

  Since the mowing apparatus 300 of the present embodiment is configured as described above, the following operations are realized.

  As shown in FIG. 9A, when the connecting point D is arranged behind the straight line M, the horizontal rotation position of the first arm 21 is “rear position” by the urging force received from the urging member 85. Retained. At this time, the first arm 21 and the second arm 22 are extended to the rear of the traveling machine body 10. Therefore, the cutting mechanism 40 is disposed (withdrawn) behind the traveling machine body 10.

On the other hand, when the parallel link in the state shown in FIG. 9A is manually rotated and the connecting point D is moved to a position in front of the straight line M, the first arm 21 and the second arm 22 are According to the urging force received from the urging member 85, it rotates counterclockwise in plan view.
And the rotation of the 1st arm 21 and the 2nd arm 22 is stopped in the point which reached the "side position" shown in FIG.9 (b). At this time, the first arm 21 and the second arm 22 extend slightly rearward from the side (right side) of the traveling machine body 10. Therefore, the mowing apparatus 300 is in a posture of projecting to the right side of the traveling machine body 10.

Thus, since the mowing apparatus 300 of the present embodiment includes the holding mechanism 80, the position of the parallel link can be stably held at the “rear position” or the “side position”. Therefore, the posture change of the mowing apparatus 300 can be easily performed.
Moreover, in the mowing apparatus 300 of this embodiment, since both the connection point C and the connection point D displace in a horizontal surface, it can be made to surely exceed a fulcrum, and the 1st arm 21 and the 2nd arm 22 The degree of freedom in layout such as the rotation position and the position of the rotation shaft 23 increases.
Note that, similarly to the mowing apparatus 200, the mowing apparatus 300 according to the present embodiment also makes contact with the parallel links (the first arm 21 and the second arm 22), thereby further extending the parallel links in the horizontal direction. Restriction members 50 and 73 for restricting the rotation are provided.

<Other embodiments>
Although a preferred embodiment of the present invention has been described above, the following configuration may be used instead of the above embodiment.

  The mowing apparatus 100 of the above embodiment is attached to the rice transplanter 1. However, instead of this configuration, the mowing apparatus according to the present invention may be mounted on other types of mobile agricultural machines such as riding type management machines and tractors. In such a case, it is possible to remove the mowing device as an assembly from the tip of the lifting link mechanism and attach it to the tip of the lifting link mechanism of another mobile agricultural machine. In addition, by changing the design (length, bending) of the mounting stay, etc., the mowing apparatus can be shared and can be mounted on various mobile farm machines. Further, since it is configured as an assembly, it can be easily assembled.

  The mowing apparatus 100 according to the above embodiment is attached to the rear portion of the traveling machine body 10 of the rice transplanter 1. However, instead of this configuration, the mowing apparatus according to the present invention may be attached to the front part of the traveling machine body of the mobile agricultural machine. In such a case, the elevating link mechanism is provided at the front portion of the traveling machine body, and the parallel link is rotatably provided within the range from the “front position” to the “side position” of the traveling machine body.

  The biasing member 60 provided in the mowing apparatus 100 of the above embodiment is a tension coil spring. However, instead of this configuration, it is also possible to configure with a spring spring or the like.

  It is good also as a structure which comprises a weight (weight) on the opposite side (left side in said embodiment) to the side by which the cutting mechanism 40 is arrange | positioned. Specifically, for example, the left end portion of the regulating member 50 can be configured to extend to the left side of the traveling machine body 10, and a weight can be configured to be detachable from the left end portion of the regulating member 50. In such a configuration, the left and right balance of the rice transplanter 1 and the mowing apparatus 100 can be improved, and the left and right sides of the traveling machine body 10 sink below the traveling surface due to the weight of the mowing apparatus 100. Can be prevented.

In the mowing apparatus 100 of the above embodiment, the mowing engine 12 for the mowing apparatus is provided separately from the engine 3 of the rice transplanter 1 (mobile farm machine). However, it is good also as a structure which replaces with this structure and obtains the driving force of a mowing apparatus from the engine for mobile agricultural machines. Specifically, for example, a part of the power of the engine for the mobile agricultural machine is taken out from the PTO shaft through a gear box or the like, and the power taken out from the PTO shaft is transmitted to the hydraulic pump 13. Then, the hydraulic motor 43 of the cutting mechanism 40 is operated by the pressure oil from the hydraulic pump 13. In such a configuration, a dedicated engine for the mowing apparatus is not necessary, and the manufacturing cost can be reduced.
It is also possible to employ a configuration in which the hydraulic pump 13 is driven using an electric motor instead of the mowing engine 12.

  The mowing mechanism 40 of the mowing apparatus 100 of the above embodiment is provided with two right and left mowing blades. However, instead of this configuration, for example, three or more cutting blades may be provided in parallel in the left-right direction. With such a configuration, the cutting operation can be performed efficiently even when mowing a wide ridgeline.

  In the mowing apparatus 200 of the above embodiment, the urging member 75 includes a spring seat 71 extending from the connection bracket 93 via the restriction member 50, a spring seat 72 extending from the first arm 21, It was assumed that they were interposed (intervened). More simply, the biasing member 75 is interposed between the regulating member 50 and the second arm 22. However, instead of this configuration, a biasing member may be interposed between the regulating member and the first arm. Specifically, for example, an urging member can be interposed between a spring seat extending upward from the connection bracket and a spring seat extending upward from the second arm.

In the mowing apparatus 100 of the above embodiment, one roller 46 is provided at the rear portion of the mowing mechanism 40. However, it is good also as a structure which replaces with this structure and comprises the roller arranged in parallel with the rear part of the cutting mechanism.
A cutting mechanism 400 shown in FIG. 10 is a specific example of a cutting mechanism including such rollers 460 and 460. By comprising in this way, the followable | trackability to the ground surface and the pasting property of the cutting mechanism 400 can be aimed at further improvement. A rubber sag 480 is suspended from the lower end of the reaping cover of the reaping mechanism 400. With such a configuration, pebbles and the like that are flipped up by the rotation of the cutting blade are prevented from scattering from the rear of the cutting mechanism 400 to the surroundings, thereby improving safety.

1 Rice transplanter (mobile farm machine)
10 Traveling machine body 21 First arm (parallel link)
22 Second arm (parallel link)
DESCRIPTION OF SYMBOLS 40 Mowing mechanism 50 Control member 60 Energizing member 90 Elevating link mechanism 93 Connection bracket 100 Mowing apparatus

Claims (4)

A mowing apparatus that can be attached to a lifting link mechanism provided at the front or rear of a traveling machine body of a mobile agricultural machine,
A connection bracket that is detachably supported at the tip of the elevating link mechanism;
One end portion is pivotally supported by the connecting bracket, and a parallel link that is rotatable in the horizontal direction within a range from the “front position” or “rear position” to the “side position”;
An urging member for urging the parallel link to be held in a “side position”;
A mowing mechanism attached to the other end of the parallel link. A mowing apparatus that can be attached to a lifting link mechanism provided at the front or rear of a traveling machine body of a mobile agricultural machine,
A connection bracket that is detachably supported at the tip of the elevating link mechanism;
One end portion is pivotally supported by the connecting bracket, and a parallel link that is rotatable in the horizontal direction within a range from the “front position” or “rear position” to the “side position”;
A holding mechanism that selectively holds the parallel link at any one of a “front position”, a “rear position”, and a “side position”;
A mowing mechanism attached to the other end of the parallel link. The mowing device according to claim 2,
The holding mechanism is
A regulating member that regulates further horizontal rotation of the parallel link by contacting the parallel link;
The parallel link is interposed between the parallel link and the restricting member, and the parallel link is selectively biased to either the “front position” side, the “rear position” side, or the “side position” side. And a biasing member. The mowing apparatus according to claim 3,
The biasing member is
When the horizontal rotation position of the parallel link reaches the “front position” side or the “rear position” side of the position where the fulcrum is exceeded, the parallel link is moved to the “front position” side or “rear side”. Energize to the “position” side,
A mowing device that biases the parallel link toward the “side position” when the horizontal rotation position of the parallel link reaches the “side position” side of the position where the fulcrum is exceeded. .

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