JP2004016137A - Cutting apparatus of walking type mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reaping blade apparatus capable of reducing scattering of stone, pieces of wood, or the like, from an uptake port of a weed and carrying out safe reaping operation having good efficiency and ensuring uptake performance of the weed. <P>SOLUTION: In a walking type mower in which two-tiered reaping blades are mounted perpendicularly to a rotation shaft 1 nearly vertical to the ground, the cutting apparatus for the walking type mower is constituted so that these two-tiered reaping blades are installed at height positions corresponding to a plant foot and an intermediate part, and the upper reaping blade 2 is formed as a plate-like body and the lower reaping blade 3 is formed as a wire rod having flexibility. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting device for a walking-type mower for cutting grass such as ridges, agricultural roads, and slopes.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a rotating shaft provided substantially vertically with respect to the ground, and a plate-like cutting blade having two stages, which is orthogonal to the rotating shaft, is mounted on the rotating shaft. Also, Japanese Patent Application Laid-Open No. 2000-139158 discloses a walking type mowing machine in which rotating shafts equipped with upper and lower two-stage plate-shaped cutting blades are arranged in right and left rows. In the cutting blade devices of these mowers, a cutting blade cover is provided so as to cover the cutting blade. Normally, the weed intake of the cutting blade cover is provided in front of the cutting blade device to prevent scattering of stones and wood chips to workers, and to guide the cut weed to the side or back without scattering it around. It is configured to do.
[0003]
[Problems to be solved by the invention]
However, there is a possibility that stones may be scattered by the upper and lower plate-shaped cutting blades, especially the lower cutting blade, and scattering of stones and wood chips from the opening portion of the cutting blade cover cannot be completely prevented. there were. Even in the case of a two-stage plate-shaped cutting blade with rotating shafts arranged side by side, the weed taking-up performance is good by rotating the upper cutting blade opposite on the front side, but also the cutting blade with the lower cutting blade It has been difficult to prevent stones and wood chips from scattering to the cover opening. These scatterings are remarkable particularly when the cutting blade is inclined forward and downward or the height of the cutting blade from the ground is reduced, for example, when the cutting height of weeds is reduced. An object of the present invention is to provide a cutting blade device that can reduce the scattering of stones, wood chips, and the like from the opening portion of the cutting blade cover, can perform safe and efficient cutting work, and ensure the weed taking-in performance. As an issue.
[0004]
[Means for Solving the Problems]
In a walking type mowing machine equipped with two upper and lower cutting blades perpendicular to the rotation axis 1 substantially perpendicular to the ground, the upper upper cutting blade 2 is a plate-like body and the lower lower cutting blade 3 is flexible. And a cutting device of a walking type mowing machine constituted by a wire rod having a property.
Further, the upper and lower two-stage cutting blades are provided in at least a pair of left and right.
[0005]
Function and effect of the present invention
The invention according to claim 1 is a walking type mowing machine equipped with two upper and lower cutting blades orthogonal to a rotating shaft 1 provided substantially vertically to the ground, wherein the upper upper cutting blade 2 has a plate shape. Since the lower cutting blade 3 is made of a flexible wire rod, hard stalks and large-diameter grass are surely cut by the upper cutting blade 2, and the soft cutting grass on the low ground surface is cut by the lower cutting blade. Cutting allows efficient mowing work, and the upper mowing blade 2 can reliably take in grass. Further, since the lower cutting blade is made of a wire having flexibility, the scattering of stones is small, the cutting height can be reduced, and the cutting marks are beautiful.
According to the second aspect of the present invention, since the upper and lower two-stage cutting blades are provided in a pair on the left and right, the grass taking-in performance is more excellent than the above-described operation and effect, and long grasses can be taken in and cut off reliably. At the same time, the cutting width can be made wider.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
An engine 11 is attached to a rear part of a gear case 10 provided in the center of the body, and arms 14 and 15 are provided downward from tips of support rods 12 and 13 extending left and right from the gear case 10, and lower ends of the arms 14 and 15. A running wheel 16 is pivotally supported at the portion. One of the arms 14 is provided with a chain transmission mechanism therein so that the running wheels 16 are rotationally driven by the power of the engine 11.
[0007]
On the front side of the gear case 10, there is provided a transmission case 17 having rotating shafts 1, 1 which are divided into right and left and supported substantially vertically, and the left and right rotating shafts 1, 1 have a height corresponding to a root of a grass and an intermediate portion. An upper cutting blade 2 and a lower cutting blade 3 projecting in the diametrical direction of the rotating shafts 1 and 1 are attached to the two stages, respectively, so that the front sides of the left and right cutting blades 2 and 3 when viewed from above rotate backward toward the center. It is.
FIG. 7 is an enlarged view of a mounting portion of the lower cutting blade 3, and a cutting blade mounting 51 is fastened and fixed to a tip end of the center rotating shaft 1 by a bolt 50. The outer periphery of the cutting blade attachment 51 is provided with a hole 53 for passing the lower cutting blade 3 of the wire having the retaining 52, so that the lower cutting blade 3 does not come off due to the centrifugal force of the rotating shaft 1. The lower blade can be made of a material such as a resin cord or a metal wire. For example, when a resin cord is used, it is inexpensive, light, and the cutting marks are clean and durable, but hard stems and the like cannot be cut. A metal wire can cut hard stems and the like that could not be cut with a resin cord, but is relatively inexpensive and expensive. As described above, the lower mowing blade 3 can be selected according to the type of grass, and both can perform a safe operation with less scattering of stones.
In the embodiment of FIG. 1, the upper cutting blades 2 and 2 are attached with a phase shift of 90 °, and the phases of the upper and lower cutting blades 2 and 3 are also shifted by 90 °.
Reference numeral 7 denotes a belt, which transmits the power of the gear case 10 to the rotating shafts 1 and 1 by being wound around a pulley 8 fixed to the output shaft of the gear case 10 and pulleys 9 and 9 fixed to the rotating shafts 1 and 1.
On the upper side of the traveling wheel 16, a traveling wheel cover 18 is attached to the lower side of the gear case 10, and a cutting blade cover 19 that covers the entire cutting blades 2, 3 is provided on the front side of the traveling wheel cover 18.
[0008]
As shown in FIG. 5, the left and right side portions 16a of the traveling wheel 16 have a large diameter and the middle portion 16b has a small diameter so that the cut grass can easily pass under the middle portion 16b. Iron lugs 20 protrude from both sides 16a and the middle part 16b at appropriate intervals, and rubber lugs 21 are wound around the outer ends of both sides 16a.
In addition, the shape of the running wheel 16 may be a drum shape having a gradually decreasing diameter from both left and right ends toward the center.
[0009]
A mounting base 23 is mounted on the upper part of the gear case 10, and a handle base 24 is mounted on the mounting base 23 so as to be horizontally rotatable. 25 is a fixture for fixing the horizontal rotation position of the handle base 24 with respect to the mounting base 23.
On the upper part of the handle base 24, a handle rod 26 is pivotally supported by a horizontal axis 27, and the inclination of the handle rod 26 with respect to the handle base 24 can be adjusted by a fixture 28. Can also be fixed.
Reference numeral 33 denotes a transmission cover that covers the pulleys 8, 9, 9, and the belt 7. The transmission cover 33 extends forward and upward from the left and right central portions, and is provided with a stay 34 that is curved forward and downward. Has a gauge wheel 35 pivotally supported.
[0010]
At the tip of the handlebar 26, a loop-shaped handle 29 is attached, and an accelerator lever 30 connected to the engine 11 is attached to the handle 29. By holding the accelerator lever 30 and the handle 29, the rotation speed of the engine 11 can be changed. is there. Numeral 38 denotes a traveling clutch lever for intermittently driving the traveling wheel 16 via a wire 39. Reference numeral 31 denotes a handle rotation lever which operates the fixing tool 25 via a wire 32 so that the handle base 24 can be rotated and fixed to the mounting base 23 in the left-right horizontal direction.
When using the mowing machine configured as described above, the cutting blades 2 and 3 are driven while the traveling wheels 16 are running to cut weeds.
The cut grass is collected at the left and right centers by the rotation of the cutting blades 2 and 3, passes below the central portion 16 b of the traveling wheel 16, and is discharged backward.
[0011]
When the mowing work is performed while traveling forward using the walking-type mowing machine having the above configuration, the left and right cutting blades 2 and 3 rotate toward the center on the front side in a plan view, so that the grass is reliably taken in. Can be imported from More specifically, the upper cutting blade 2 having a distance from the ground acts to take in the grass, cutting hard stalks and large-diameter grass, and the lower cutting blade 3 does not scatter the stones and wood chips on the ground. The root of the grass can be cut off. In the embodiment of the present invention, a description has been given of a cutting blade device in which the rotating shafts 1 are arranged in a row on the left and right. However, as shown in FIG. In a further embodiment, the upper cutting blade 2 may be constituted by a disk-shaped cutting blade as shown in FIG. 8, and as shown in FIG. The flexible wire may be used.
[Brief description of the drawings]
FIG. 1 is a plan view and a front view of a main part of the present invention.
FIG. 2 is a side sectional view of the present invention.
FIG. 3 is a partially omitted plan view of the present invention.
FIG. 4 is a partial side sectional view showing the embodiment of the present invention.
FIG. 5 is a partial rear view showing the embodiment of the present invention.
FIG. 6 is a plan view and a front view of a main part showing a conventional example.
FIG. 7 is a sectional side view of a main part of the present invention.
FIG. 8 is a plan view of a main part and a front view of a main part showing another embodiment.
FIG. 9 is a plan view of a main part and a front view of a main part showing another embodiment.
FIG. 10 is a plan view of a main part and a front view of a main part showing another embodiment.
[Explanation of symbols]
1 rotating shaft 2 cutting blade 3 cutting blade

Claims (2)

A walking type mowing machine equipped with upper and lower cutting blades perpendicular to the rotation axis (1) substantially perpendicular to the ground, wherein the upper upper cutting blade (2) is a plate-like body and the lower lower cutting blade is A cutting device for a walking-type mower, wherein (3) is configured as a flexible wire. The cutting device for a walking-type mower according to claim 1, wherein at least two pairs of upper and lower cutting blades are provided on the left and right sides.

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