JP3826101B2 - Self-propelled walking mower - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a mower capable of mowing a flat ground, a paddy field, a shoulder of a road, or a wavy surface, and more particularly, it is easy to improve transmission efficiency and durability and to adjust the mowing height. It relates to a mower that can.
[0002]
[Prior art]
For example, in order to efficiently cut the weeds of rice fields and shoulders of roads, hand-held or riding type mowers with a motor are used. Conventionally, this type of mower is mainly equipped with a clipper type mowing unit, and usually has one fixed type clipper.
[0003]
[Problems to be solved by the invention]
However, the conventional mower as described above has the following problems.
That is, since there is only one clipper, only one surface can be cut at a time. For this reason, when cutting grass in a field such as a field fence with slopes with different angles on both sides of the upper surface, it is necessary to reciprocate as many times as the slope when the upper surface is finished. It was bad.
Moreover, the clippers are structurally complex and tend to clog grass, and the cutting speed is slow. Also, the blade is consumed quickly and cannot be cut in a short time. Furthermore, the grass was cut long without being cut finely, and it was unsightly because it remained on the cut surface, and the cut grass was slow to rot, and the grass remained and was in the way.
[0004]
In the microfilm of Japanese Utility Model No. 3-18217 (Japanese Utility Model Laid-Open No. 4-142929), there is a horizontal rotary cutting body that cuts a horizontal plane, and an inclination that is located on the side of the horizontal rotary cutting body and cuts an inclined surface. A mower having a rotary cutting body is disclosed.
In addition, the microfilm of Japanese Patent Application No. 59-181947 (Japanese Utility Model Application No. 61-95229) is located on the side of the horizontal clipper type cutting body for cutting the horizontal plane and the horizontal clipper type cutting body. There is disclosed a mowing machine including an inclined rotary cutting body that cuts an inclined surface.
Moreover, the transmission shaft which has flexibility is used for all the mowers for the power transmission to an inclined cutting body.
[0005]
Since all of these mowers can mow the grass on the upper surface and the slope at the same time, the working efficiency is better than in the case of a mower with a single clipper, and the above problem can be solved temporarily.
However, since a flexible transmission shaft is used for power transmission, there are the following problems.
That is, the length and the degree of deflection of the transmission shaft are set so that the transmission efficiency is good when the inclined cutting body is used on an inclined surface. Therefore, when the inclined cutting body is used in the horizontal state in the same manner as the horizontal cutting body, the transmission shaft has an inverted “U” shape with large deflection, and the angle formed by the axial direction of both end portions is 90 degrees or less. Become.
In such a case, the durability and transmission efficiency of the transmission shaft are remarkably lowered, and the actual situation is that the transmission shaft cannot be practically used and is not commercialized.
[0006]
By the way, when the paddy field is filled with water, the upper surface of the paddy is soft with water. In the case of the mower, the horizontal mowing body that runs on the upper surface of the hoe is equipped with an engine, a mission, etc., and since the weight is considerable, the horizontal reaping body is sunk into the upper surface of the hoe by its own weight. End up.
Therefore, even if the cutting height of the grass is adjusted in advance, it immediately changes, and it becomes necessary to adjust the cutting height relatively frequently in accordance with the properties of the ground.
畦 The top surface is narrow, and the conventional mower has an adjustment device at the front, so in order to adjust the mowing height, you have to go into the paddy field and go in front of the mower. A mower that can quickly adjust the cutting height has been desired.
Similarly, there is a case where the cutting height is adjusted under a shrub. In this case as well, a mower capable of adjusting the cutting height so as not to get in the way even if there is a branch has been desired.
[0007]
OBJECT OF THE INVENTION
Therefore, an object of the present invention is to achieve good transmission efficiency between the horizontal cutting body and the inclined cutting body even when the angle formed by the inclined cutting body with respect to the horizontal cutting body changes in the vertical direction with respect to the horizontal direction. An object of the present invention is to provide a mower having a highly efficient transmission means.
Another object of the present invention is to provide a mower capable of adjusting the mowing height at the hand of the mower.
[0008]
[Means for Solving the Problems]
The means of the present invention taken to solve the above-mentioned problems are as follows.
In the first means,
A main cutter base provided with a main rotary blade that is disposed in front of a self-propelled base that travels by a traveling device and rotates horizontally or substantially horizontally, and rotates on a plane that intersects the plane of rotation of the main rotary blade. A movable cutter base provided with a secondary rotary blade capable of swinging up and down with respect to the main cutter base, wherein the main cutter base and the movable cutter base are arranged side by side in a front view. It is a self-propelled walking type mower that is installed,
In the mower, the rear wheel and the front wheel are arranged behind the prime mover, and the driving force of the rear wheel and the driving force of the main rotary blade and the auxiliary rotary blade are transmitted from the prime mover. And
The main cutter base and the sub cutter base each have a gear box on the upper surface side, and the main rotary blade and the sub rotation are located between the gear boxes above the joint portion of the main cutter base and the sub cutter base. It has a transmission shaft interlocking with the blade, the transmission shaft has a telescopic shaft,
When the movable cutter base swings in the vertical direction, the telescopic shaft is configured to expand and contract, and the telescopic shaft is configured to transmit the rotational force even if the axis crossing angle of the main rotary blade and the sub rotary blade changes. Has been
The front wheel is attached to the tip end of a pivot member pivotally supported, is disposed in front of the main rotary blade, the tip is fixed to the pivot member, and the operation portion is mowing. A cutting height adjusting lever provided on the handle side of the machine, and a cutting height adjusting means for fixing the position of the cutting height adjusting lever according to the cutting height, with the pivoting portion as a center by the movement of the cutting height adjusting lever The support leg member is configured to rotate and adjust the cutting height.
This is a self-propelled walking mower.
[0009]
In the second means,
Self-propelled base that travels with a traveling device A main cutter base having a main rotary blade that is disposed in front of the main rotary blade and rotates horizontally or substantially horizontally, and a sub rotary blade that can rotate on a plane that intersects the plane of the main rotary blade in the rotational direction. A self-propelled walking including a movable cutter base installed so as to swing up and down relative to the cutter base, wherein the main cutter base and the movable cutter base are arranged side by side in a front view A type mower,
In the mower, the rear wheel and the front wheel are arranged behind the prime mover, and the driving force of the rear wheel and the driving force of the main rotary blade and the auxiliary rotary blade are transmitted from the prime mover. And
The main cutter base and the sub cutter base each have a gear box on the upper surface side, and the main rotary blade and the sub rotation are located between the gear boxes above the joint portion of the main cutter base and the sub cutter base. It has a transmission shaft interlocking with the blade, the transmission shaft has a telescopic shaft,
When the movable cutter base swings in the vertical direction, the telescopic shaft is configured to expand and contract, and the telescopic shaft is configured to transmit the rotational force even if the axis crossing angle of the main rotary blade and the sub rotary blade changes. Has been
Between the rear wheel and the front wheel, there is a main cutter base and a prime mover with a pulley attached to the output shaft that protrudes in the lateral direction. The prime mover is on the rear wheel side, and the main cutter base is on the front It is arranged on the wheel side, the main cutter base is equipped with a bearing, the gear box is provided at the top of the bearing,
The bearing has a rotating shaft that is supported in a direction orthogonal to the main cutter base through the main cutter base. A rotary blade is attached to the lower end of the rotating shaft and a bevel gear is attached to the upper end. The bevel gear is located in the gear box,
The movable cutter base is equipped with a bearing, and the gear box is provided at the upper part of the bearing. The bearing has a rotating shaft pivotally supported in a direction orthogonal to the movable cutter base through the movable cutter base. A rotary blade is attached to the lower end of the rotating shaft, and a bevel gear is attached to the upper end, and the bevel gear is located in the gear box.
The transmission shaft is provided between the gear box of the main cutter base and the gear box of the movable cutter base in a direction intersecting the traveling direction.
The transmission shaft connects the drive shaft supported by the gear box on the main cutter base side, the driven shaft supported by the gear box on the movable cutter base side, and the drive shaft and the driven shaft. The drive shaft is equipped with a bevel gear that meshes with the bevel gear of the rotary shaft that rotates the main rotary blade.
A pulley driven by a prime mover is attached to the outer end of the drive shaft, and the inner end is connected to one end of the telescopic shaft via a universal joint,
The output shaft of the prime mover, the pulley attached to the output shaft, the pulley attached to the outer end of the drive shaft, and the belt wound between both pulleys are on the opposite side of the movable cutter base The bevel gear that meshes with the bevel gear of the rotary shaft that rotates the sub rotary blade is attached to the driven shaft.
The inner end portion of the driven shaft is connected to the other end portion of the telescopic shaft via a universal joint, and the rotary blades of the main rotary blade and the sub rotary blade are mounted with their blade angles shifted in plan view. The rotating blades are synchronously rotated in opposite directions so as to embrace the grass, so that they do not come into contact with each other even when the tracks of the rotating blades overlap each other. It is configured to be able to interlock the rotary blade,
This is a self-propelled walking mower.
[0011]
[Action]
Adjust the angle of the main cutter base and the movable cutter base according to the mowing work surface. For example, when the work surface is a saddle and is composed of a substantially horizontal upper surface and a slope inclined downward, the movable cutter base is inclined downward and set substantially parallel to the slope.
[0012]
If the mower is run on the upper surface of the reed, the main rotary blade provided on the main cutter base cuts the grass on the upper surface of the reed, and at the same time the auxiliary rotary blade provided on the movable cutter base is the method of reed Mow the grass on the face. The rotation direction of the rotary blade is preferably, but not limited to, the directions opposite to each other in the direction of holding the grass inside.
[0013]
The transmission shaft that links the main rotating blade and the sub-rotating blade is a transmission shaft that expands and contracts the length of the transmission shaft in the axial direction following the vertical swing of the movable cutter base, and the transmission shaft even if the axis crossing angle changes. A shaft coupling configured to be able to be transmitted to the auxiliary rotary blade while maintaining the linear state of the expansion / contraction portion is included. For this reason, even when the movable cutter base is used in a horizontal state, that is, in parallel with the main cutter base, or when the movable cutter base is tilted with respect to the main cutter base at a required angle, the transmission shaft is unreasonable. Therefore, the durability can be improved and the transmission efficiency can be prevented from being lowered.
[0014]
The apparatus for adjusting the height of cutting grass has a guide wheel that is attached to the tip of a pivot member pivotally supported and disposed in front of the main rotary blade. The tip of the adjustment lever is fixed to the support leg member, and the operation part is provided on the handle side of the mower, and by moving the cutting height adjustment lever, the support leg member rotates around the pivot support part to reduce the cutting height. This is a configuration that can be adjusted. Therefore, even when it is necessary to adjust the cutting height of the mower, the cutting height can be quickly adjusted on the handle side. Therefore, it is not necessary to move forward in front of the work machine for every adjustment, and particularly when the width is narrow and the height is adjusted like the upper surface of the paddle, it is suitable when it is necessary to enter the paddy field.
[0015]
In addition, the cutting height can be adjusted by the support leg that has a guide wheel at the tip and rotates around the pivot, so the structure is simple and the movement of the cutting height adjustment lever is very small. Even when the cutting height is adjusted with the, the cutting height adjusting lever does not hit the branch of the tree.
In the case where the movable cutter base is detachably mounted on the main cutter base, the width of the mower can be reduced by removing the movable cutter base, so that mowing work can be efficiently performed in a narrow place.
[0016]
【Example】
The invention will be explained in more detail on the basis of an embodiment shown in the drawing.
FIG. 1 is a perspective view showing a first embodiment of a mower according to the present invention, FIG. 2 is an explanatory view of a main part of means for driving a rotary blade, and FIG. 3 is an angle adjusting device for a main cutter base and a movable cutter base. FIG. 4 shows a relationship between a main cutter base having a main rotary blade, a movable cutter base having a sub rotary blade, and a transmission shaft that links the main rotary blade and the sub rotary blade. It is explanatory drawing which notched.
[0017]
Reference numeral C <b> 1 is a mower and includes a self-propelled base 1. The self-propelled base 1 includes a frame F (shown in FIG. 3), and a motor E is mounted on the frame F. Traveling wheels 10 are provided below the frame F. The traveling wheel 10 is driven by a prime mover E via a drive transmission unit 11 formed of a pulley or a belt, and has a structure that can be easily replaced with a traveling wheel having a different diameter prepared separately. Reference numeral 12 denotes a handle provided with a brake, a clutch operating portion and the like.
[0018]
A main cutter base 2 is horizontally attached to the front portion of the frame F. The main cutter base 2 is a rectangular plate, and a cover 20 is attached to one side edge portion thereof. A guide wheel 21 is provided at the front of the main cutter base 2 via an attachment member 210. The guide wheel 21 is provided with cutting height adjusting means having the same structure as the guide wheel 31 described later.
[0019]
A movable cutter base 3 is attached to the other side edge of the main cutter base 2 via a hinge 29 so as to be swingable up and down. A cover 30 is attached to the side edge of the movable cutter base 3. Further, a guide wheel 31 is provided at the front portion of the movable cutter base 3 via an attachment member 310.
A shaft tube 311 constituting cutting height adjustment means is provided in the longitudinal direction at the tip of the attachment member 310. A guide shaft 313 provided on the axle 312 is inserted through the shaft tube 311. The shaft tube 311 is provided with a screw-type fixture 314 for fixing the guide shaft 313 at a required position.
[0020]
Please refer to FIG.
An angle adjusting device is provided at the boundary between the main cutter base 2 and the movable cutter base 3 so that the angle between the two can be set stepwise. The angle adjustment device has an adjustment plate 32 which is a semicircular plate. The adjustment plate 32 is erected by fixing almost half of the lower side portion to the upper rear end edge of the movable cutter base 3. Near the edge of the arc portion of the adjustment plate 32, a required number of engagement holes 33 arranged in an arc shape with the same radius centered on the hinge 29 are provided at equal intervals.
[0021]
An escape portion 22 is formed at the rear edge of the main cutter base 2 so that the adjustment plate 32 can pass through. In addition to the structure of the present embodiment, for example, when the main cutter base 2 is not provided with the relief portion 22, the central angle of the adjustment plate 32 is formed slightly small, and the movable cutter base 3 is rotated upward. Further, the movable cutter base 3 can be stopped by contacting the end side of the adjustment plate 32 with the main cutter base 2.
[0022]
The frame F is provided with pin bearings 23 corresponding to the engagement holes 33. An engagement pin 24, which is an engagement member that is operated to enter and exit via the wire tube T, is provided at the tip of the pin bearing 23. The pin bearing 23 is attached at a position where the engaging pin 24 engages with the middle engaging hole 33 when the main cutter base 2 and the movable cutter base 3 are in a parallel state. Thereby, the movable cutter base 3 can be fixed by being inclined at a required angle (by stepwise adjustment) up and down around the state parallel to the main cutter base 2.
[0023]
Please refer to FIG. 2 and FIG.
A main rotary blade 4 and a sub rotary blade 4a are attached to the central portions of the main cutter base 2 and the movable cutter base 3, respectively. Bearings 40 and 40a are provided above the main rotary blade 4 and the sub rotary blade 4a, and gear boxes 41 and 41a are provided above the bearings 40 and 40a.
[0024]
Rotating shafts 42 and 42 a are pivotally supported on the bearings 40 and 40 a through the main cutter base 2 and the movable cutter base 3. The rotary blades 43 and 43a linearly arranged around the rotary shafts 42 and 42a are attached to the lower portions of the rotary shafts 42 and 42a. Each rotary blade 43, 43a is inclined downward toward the center and the tip is formed horizontally. In addition, the height of each rotary blade 43 and 43a is set so that it may be located in the space | interval suitable for a working surface (ground) and mowing. Moreover, it can also be set as the structure which can adjust the height of each rotary blade 43 and 43a.
[0025]
Bevel gears 44 and 44a are attached to the upper ends of the rotary shafts 42 and 42a, and the bevel gears 44 and 44a are located in the gear boxes 41 and 41a. A transmission shaft 5 which is a means for driving the rotary blade via bearings 45 and 45a is supported between the gear boxes 41 and 41a.
[0026]
The transmission shaft 5 includes a drive shaft 51 that is pivotally supported by the gear box 41, a driven shaft 52 that is pivotally supported by the gear box 41a, and a telescopic shaft 53 that connects them.
A bevel gear 54 that meshes with the bevel gear 44 of the rotating shaft 42 is attached to the drive shaft 51. A pulley 55 is attached to the outer end portion of the drive shaft 51, and the inner end portion is connected to one end portion of the telescopic shaft 53 via a universal joint 56 that is a shaft joint. The pulley 55 is driven by the prime mover E via the belt 59.
[0027]
A bevel gear 57 that meshes with the bevel gear 44a of the rotating shaft 42a is attached to the driven shaft 52. The bevel gear 57 is attached with the bevel gear 54 facing the tooth side so that the rotary blades 43 and 43a rotate in opposite directions. The inner end of the driven shaft 52 is connected to the other end of the telescopic shaft 53 via a universal joint 58.
[0028]
The telescopic shaft 53 has a three-stage spline structure. Coupled with the action of the universal joints 56 and 58, the rotary blades 4 and 4a are set in advance with the angles of the main cutter base 2 and the movable cutter base 3 being set. Within the range, it can be linked regardless of the angle.
[0029]
The rotary blades 43 and 43a of the rotary blades 4 and 4a are attached with their blade angles shifted in plan view, and rotate in opposite directions and synchronously so that the rotary blades 43 and 43a embrace the grass. Therefore, even when the tracks of the rotary blades 43 and 43a overlap, there is no contact. In this embodiment, the telescopic shaft 53 has a three-stage spline structure, but it may be a two-stage type.
[0030]
FIG. 5 is an explanatory diagram when using one rotary blade tilted downward, FIG. 6 is an explanatory diagram when using one rotary blade tilted upward, and FIG. 7 uses traveling wheels of different diameters. It is explanatory drawing in the case of doing. The use method and operation of the present embodiment will be described with reference to the drawings.
[0031]
1. When the slope G2 is a downward inclined surface with respect to the upper surface G1, as shown in FIG. 5, the mower C1 is first placed on the upper surface G1, and the heights of the guide wheels 21, 31 are adjusted by the fixture 314 or the like. . Thereby, the cutting height of the rotary blade 4 is set.
Next, the angle adjusting device is adjusted to adjust the angle of the movable cutter base 3, and the blade surface of the rotary blade 43a of the rotary blade 4a is fixed so as to be substantially parallel to the slope G2. Thereby, the mower C1 does not wobble and can run stably. At this time, the telescopic shaft 53 of the transmission shaft 5 is in an extended state. And if the rotary blades 4 and 4a are driven and the mower C1 is made to travel, the grass on the upper surface G1 and the slope G2 on one side can be mowed simultaneously.
[0032]
2. When the slope G2 ′ is an upward inclined surface with respect to the horizontal plane G3 as shown in FIG. 6, the mower C1 is first placed on the horizontal plane G3. Next, the angle adjustment device is adjusted to adjust the angle of the movable cutter base 3, and the blade surface of the rotary blade 43a of the rotary blade 4a is fixed so as to be substantially parallel to the slope G2 ′, so that stable running is possible. Like that. At this time, the telescopic shaft 53 of the transmission shaft 5 is in a contracted state. And if the rotary blades 4 and 4a are driven and the mower C1 is made to travel, the grass on the horizontal plane G3 and the slope G2 ′ can be cut simultaneously.
[0033]
3. When the upper surface G1, which is the traveling surface of the mower C1, is inclined to one side, if the left and right traveling wheels 10, 10 have the same diameter, the mower C1 itself is inclined and the straight traveling performance is not stable. As it goes on, it gradually turns to the lower side of the slope, making it impossible to cut the slope G2. For this reason, it is necessary to frequently correct the direction during the work. This requires a considerable amount of force and is difficult to work.
[0034]
Therefore, as shown in FIG. 7, if the traveling wheel on the side corresponding to the lower inclined side of the upper surface G <b> 1 is replaced with a traveling wheel 10 a having a slightly larger diameter and the inclination of the mower C <b> 1 is corrected, The force to bend upward and the resistance of the cutting part of the mower C1 and the force to fall downward due to the inclination of the upper surface G1 cancel each other out, and the straightness of the mower C1 is stable and efficient. I can work.
[0035]
As described above, according to the mower C1 according to the present invention, the mowing work such as the slope of the reed can be performed simultaneously with the horizontal plane. The traveling distance of the machine C1 is small and efficient work can be performed.
[0036]
Further, since the cutting part is not a clipper or the like but a rotary blade, grass cutting is unlikely to occur in the cutting part, and a quick operation can be performed. Furthermore, since the grass is cut finely and sown on the work surface, the work surface is clean, and the cut grass is easily rotted and disappears quickly.
[0037]
In addition, when the work surface is a wide plane, if the main cutter base 2 and the movable cutter base 3 are fixed in parallel as shown in FIG. 1, the running is stabilized and the grass can be cut widely at a time. .
[0038]
Furthermore, when the work surface is not flat, the movable cutter base 3 can be brought into a free swinging state by releasing the engagement of the engagement pin 24. Follow the surface and cut grass cleanly.
[0039]
FIG. 8 is a perspective view showing a second embodiment of the mower according to the present invention, and FIG. 9 is a perspective view of an angle adjusting device for the main cutter base and the movable cutter base.
The mower C2 has a similar structure to the mower C1 in a rough portion, and therefore, different portions will be described here.
[0040]
The traveling wheel 10 of the mower C2 is a single wheel. The guide wheel 21 provided on the main cutter base 2 is attached to the tip end of a support leg member 210 that is pivotally supported on a support member 212 by a shaft pin 211. Further, the tip of the cutting height adjusting lever 6 is fixed to the base portion of the support leg member 210.
[0041]
The base of the cutting height adjusting lever 6 is provided to extend below the handle 12 so that the operator can operate it by hand, and is hooked on a hooking portion 61 provided on the cutting height adjusting panel 60 in a plurality of stages. The shaft 121 of the handle 12 is inserted into the bearing tube 120. The bearing tube 120 has a fastening fixture 122 so that the height and direction of the handle 12 can be adjusted.
[0042]
According to this structure, the support leg member 210 is rotated by the vertical operation of the cutting height adjusting lever 6, and the height of the guide wheel 21, that is, the cutting height of the rotary blades 43 and 43a can be adjusted. The movable cutter base 3 can be removed from the hinge 29 portion, and the transmission shaft 5 is also removable from the gear box 41.
[0043]
Please refer to FIG. In this embodiment, the main cutter base 2 has a swing control device capable of controlling the swing of the movable cutter base 3 provided so as to be swingable. The swing control device has a control plate 34. The control plate 34 is erected by fixing almost half of the lower side to the upper surface of the movable cutter base 3. An engagement hole 341 is provided near the edge of the central portion of the control plate 34.
[0044]
Steps 342 and 343 are provided on the non-fixed side of the control plate 34. In the step portions 342 and 343, when the movable pin base 3 is rotated when the movable pin base 3 is rotated by retracting a later-described engaging pin 36 and removing it from the engaging hole 341, the angle of the movable cutter base 3 is 22.5 degrees from the horizontal. At this time, the engaging pin 36 hits the stepped portion 342, and at 45 degrees, the engaging pin 36 hits the stepped portion 343.
[0045]
The frame F is provided with pin bearings 35 corresponding to the engagement holes 341. An engagement pin 36 that is an engagement member that is operated to enter and exit through the wire tube T is provided at the tip of the pin bearing 35. The pin bearing 35 is attached at a position where the engagement pin 36 engages with the engagement hole 341 when the main cutter base 2 and the movable cutter base 3 are in a parallel state.
[0046]
According to this, the movable cutter base 3 can swing downward from the parallel state with the main cutter base 2. That is, by the action of the engaging pin 36 and the step portions 342 and 343 of the control plate 34, the movable cutter base 3 swings following the angle or unevenness of the mowing slope in the range of 60 degrees from the horizontal state.
In the drawings, the same or equivalent portions as those in the first embodiment are denoted by the same reference numerals.
[0047]
FIG. 10 is a perspective view showing another method of using the second embodiment of the mower according to the present invention.
As shown in the figure, by removing the movable cutter base 3 and the transmission shaft 5 and attaching a cover 20a to the hinge 29, a mower C2a having a two-wheel structure with one front wheel and one rear wheel is obtained.
Since the mower C2a is narrow, it is suitable for mowing work in a narrow place, and since it has a two-wheel structure with one front and one rear wheel, it has good straightness and is easy to drive.
The present invention is not limited to the embodiment shown in the drawings, and there are two movable cutter bases, each of which can be provided on both sides of the main cutter base. Deformation is possible.
[0048]
【The invention's effect】
The present invention has the above-described configuration and has the following effects.
(1) A guide wheel that is attached to the tip of a support member pivotally supported by the main rotary blade so as to be sub-rotatable and disposed in front of the main rotary blade, and a transmission shaft that links the rotary blade are The expansion and contraction means that expands and contracts the length of the transmission shaft following the vertical swing of the movable cutter base and the transmission to the sub rotary blade while maintaining the linear state of the expansion and contraction portion of the transmission shaft even if the axis crossing angle changes And a shaft coupling that is configured to be able to.
For this reason, even when the movable cutter base is used in a horizontal state, that is, in parallel with the main cutter base, even when the movable cutter base is inclined with respect to the main cutter base at a required angle, the transmission shaft is not forced. Therefore, durability can be improved and reduction in transmission efficiency can be prevented.
[0049]
(2) It has a guide wheel that is attached to the tip of a pivot member that is pivotally supported and is arranged in front of the main rotary blade. The cutting height adjustment lever has its tip fixed to the pivot member. If the operating part has a cutting height adjusting device provided on the handle side of the mower, the support leg member rotates around the pivotal part by moving the cutting height adjusting lever, and the cutting height Can be adjusted.
Therefore, even when it is necessary to adjust the cutting height of the mower, the cutting height can be quickly adjusted on the handle side. Therefore, it is not necessary to move forward in front of the work machine for every adjustment, and particularly when the width is narrow and the height is adjusted like the upper surface of the paddle, it is suitable when it is necessary to enter the paddy field.
In addition, the cutting height can be adjusted by the support leg that has a guide wheel at the tip and rotates around the pivot, so the structure is simple and the movement of the cutting height adjustment lever is very small. Even when the cutting height is adjusted with the, the cutting height adjusting lever does not hit the branch of the tree.
(3) With a structure that allows the movable cutter base to be removed, the width of the mower can be narrowed, so mowing work can be done efficiently in a narrow area.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of a mower according to the present invention.
FIG. 2 is an explanatory view of a main part of means for driving a rotary blade.
FIG. 3 is a perspective view of an angle adjusting device for a main cutter base and a movable cutter base.
FIG. 4 shows a relationship between a main cutter base having a main rotary blade, a movable cutter base having a sub rotary blade, and a transmission shaft for interlocking the main rotary blade and the sub rotary blade, with a part cut away. It is explanatory drawing.
FIG. 5 is an explanatory view when one rotary blade is used while being inclined downward.
FIG. 6 is an explanatory view when one rotary blade is used while being inclined upward.
FIG. 7 is an explanatory diagram when traveling wheels having different diameters are used.
FIG. 8 is a perspective view showing a second embodiment of the mower according to the present invention.
FIG. 9 is a perspective view of an angle adjustment device for a main cutter base and a movable cutter base.
FIG. 10 is a perspective view showing another method of using the second embodiment of the mower according to the present invention.
[Explanation of symbols]
C1 Mower 1 Self-propelled base 10 Traveling wheel 2 Main cutter base 3 Movable cutter base 4, 4a Rotary blade 5 Transmission shaft E Motor C2 Mower 6 Cutting height adjustment lever 60 Cutting height adjustment panel 32 Adjustment plate 24 Engagement pin 34 Control plate 36 Engagement pin

Claims (2)

A main cutter base (2) having a main rotary blade (43) disposed in front of a self-propelled base (1) that travels by a traveling device and that rotates horizontally or substantially horizontally; and the main rotary blade (43) A movable cutter base (3) provided with a sub-rotating blade (43a) that can rotate on a plane that intersects the plane in the rotational direction, and installed so as to swing up and down with respect to the main cutter base (2) The main cutter base (2) and the movable cutter base (3) are self-propelled walking type grass mowers arranged side by side in a front view,
The mower has a rear wheel behind the prime mover (E) and a front wheel forward.The driving force of the rear wheel, the main rotary blade (43) and the auxiliary rotary blade (43a) The driving force is transmitted from the prime mover (E),
Gearboxes (41) and (41a) are provided on the upper surfaces of the main cutter base (2) and the sub cutter base (3), respectively, and the main cutter base (2) and the sub cutter base (3) A transmission shaft (5) for interlocking the main rotary blade (43) and the sub rotary blade (43a) is provided between the gear boxes (41) and (41a) above the joint, and the transmission shaft (5) is telescopic. Has a shaft (53),
When the movable cutter base (3) swings in the vertical direction, the telescopic shaft (53) is configured to expand and contract, and the telescopic shaft (53) is the axis of the main rotary blade (43) and the auxiliary rotary blade (43a). It is configured to transmit the rotational force even if the crossing angle changes ,
The front wheel is attached to the tip end of a pivot member (210) pivotally supported, and is disposed in front of the main rotary blade (43) , and the tip is attached to the pivot member (210) . The cutting height adjustment lever (6) provided on the handle (12) side of the mower and the cutting height adjustment lever that fixes the position of the cutting height adjustment lever (6) according to the cutting height. Means for adjusting the cutting height by rotating the support leg member (210) around the pivotal support by the movement of the cutting height adjusting lever (6) ,
Self-propelled walking mower. A main cutter base having a main rotating blade (43) which is horizontal or nearly horizontal rotation is disposed in front of the free-running base running by the running device (1) (2), said main rotating blade (43) A movable cutter base (3) provided with a sub-rotating blade (43a) that can rotate on a plane that intersects the plane in the rotational direction, and installed so that it can swing up and down with respect to the main cutter base (2 ) The main cutter base (2) and the movable cutter base (3) are self-propelled walking type grass mowers arranged side by side in a front view,
The mowing machine across the prime mover (E), the rear wheels rearwardly, there is disposed a front wheel forward, the driving force of the rear wheel and the main rotary blade (43) of the auxiliary rotary blade (43a) The driving force is transmitted from the prime mover (E) ,
It has a main cutter base (2) and each gear box on the upper surface side of the auxiliary cutter base (3) (41) (41a), the main cutter base (2) and vice cutter base (3) Above the joint is provided with a transmission shaft (5) that interlocks the main rotary blade (43) and the sub rotary blade (43a) between the gear box (41) (41a) , the transmission shaft (5) is telescopic Has a shaft (53) ,
When the movable cutter base (3) swings in the vertical direction, the telescopic shaft (53) is configured to expand and contract, and the telescopic shaft (53) is the axis of the main rotary blade (43) and the auxiliary rotary blade (43a) . It is configured to transmit the rotational force even if the crossing angle changes,
Between the rear wheel and the front wheel, there is a main cutter base (2) and a motor (E) in which a pulley (p) is attached to an output shaft (s) projecting in the lateral direction. (E) is arranged on the rear wheel side, the main cutter base (2) is arranged on the front wheel side, the main cutter base (2) is provided with a bearing (40), and the gear box (41) is a bearing (40 )
The bearing (40) has a rotary shaft (42) supported through the main cutter base (2) in a direction orthogonal to the main cutter base (2), and the lower end of the rotary shaft (42). The rotary blade (43) is attached to the part, and the bevel gear (44) is attached to the upper end, and the bevel gear (44) is located in the gear box (41).
The movable cutter base (3) includes a bearing (40a), and the gear box (41a) is provided on the upper part of the bearing (40a). The bearing (40a) passes through the movable cutter base (3). The rotating shaft (42a) is supported in a direction orthogonal to the movable cutter base (3), the rotating blade (43a) is provided at the lower end of the rotating shaft (42a), and the bevel gear (44a) is provided at the upper end. ) And the bevel gear (44a) is located in the gear box (41a)
The transmission shaft (5) is provided between the gear box (41) of the main cutter base (2) and the gear box (41a) of the movable cutter base (3) in a direction intersecting the traveling direction. ,
The transmission shaft (5) is connected to the drive shaft (51) supported by the gear box (41) on the main cutter base (2) side and the gear box (41a) on the movable cutter base (3) side. It has a supported driven shaft (52) and a telescopic shaft (53) connecting the drive shaft (51) and the driven shaft (52), and the drive shaft (51) has a main rotary blade (4). The bevel gear (54) that meshes with the bevel gear (44) of the rotating shaft (42) that rotates
A pulley (55) driven by a prime mover (E) is attached to the outer end of the drive shaft (51), and the inner end is connected to one end of the telescopic shaft (53) via a universal joint (56). Connected,
The output shaft of the prime mover (E), the pulley attached to the output shaft, the pulley (55) attached to the outer end of the drive shaft (51), and the belt ( 59) is provided on the opposite side of the movable cutter base (3), and the driven shaft (52) has a bevel gear (44) that meshes with the bevel gear (44a) of the rotating shaft (42a) that rotates the auxiliary rotating blade (43a). 57) is installed,
The inner end of the driven shaft (52) is connected to the other end of the telescopic shaft (53) via a universal joint (58), and each rotation of the main rotary blade (4) and the auxiliary rotary blade (4a) The blades (43, 43a) are attached by shifting the blade angle in plan view, and the rotary blades (43, 43a) are synchronously rotated in opposite directions so as to embrace the grass. , 43a) so that the main rotary blade (4) and the sub rotary blade (4a) can be interlocked even if the movable cutter base (3) swings so that it does not come into contact when the tracks of It is configured,
Self-propelled walking mower.

Images