JP2587955B2 - Reaper - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a reaper that can be widely used for general reaping operations such as mowing a backyard, a vacant lot, a roadside, and pruning trees and hedges.

(Conventional technology and its problems) The conventional mowing machine for mowing weeds is also called a brush cutter, which rotates a bare blade at a high speed of 8,000 to 9,000 revolutions per minute. is there.
Therefore, there is a problem that the rotating blade hits a hard object such as a stone hidden in the plexus during the operation and damages the eyes due to the scattered fragments, in addition to the danger of itself. A national survey conducted by the Keio University School of Medicine found that 14 people were blind during the year of 1985 and that 10 times more people suffered severe eye injuries (December 1986
Nihon Keizai Shimbun on January 1). In addition, since this method rotates a circular blade with a diameter of 20 cm or more at high speed, it is suitable for heavy work in mountain forests such as cutting shrubs, but aims to cut ordinary thinner and softer weeds. In this case, the use of this method requires an unnecessarily large amount of energy and power for that purpose, and as a result, the weight and size of the mower itself are disadvantageously increased.

Next, a conventional clipper-type pruning machine has been used to prune plants and hedges.However, in this method, noise due to friction between the hard blades is likely to occur, and the cutting edge becomes worn and the sharpness becomes poor. If it did, resharpening was troublesome.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a reaper that is safe and easy to operate so that it can be used in ordinary households.

(Means for Solving the Problems) The present invention employs the following configuration to solve the above problems. That is, the rotating bodies having the cutter housing space formed on the outer peripheral side wall are opposed to each other so as to be able to contact each other, and the lower ends of the rotating shafts inserted into and supported by the two support pipes are fixed to the central portions of the respective rotating bodies. Then, the outer peripheral side walls of the two rotating bodies are pressed against each other so that they come into contact with each other, a cutter is inserted into the cutter storage space formed in the contact portion, and a virtual interpolation between the contact surfaces vertically separated by the storage space. With respect to the surface, the cutter blade tip is arranged so as to cross in the storage space, and the two rotating bodies are driven and rotated facing each other by a drive source and a transmission mechanism for branching and transmitting the rotational force. Is what you do.

(Operation) The operation of the present invention having the above configuration will be described. When the rotational force of a drive source such as a motor or an engine is transmitted to both two rotating bodies that are in contact on the outer peripheral surface via a transmission mechanism and a rotating shaft. The two rotating bodies are driven and rotated to face each other. When this rotating contact portion is pressed against an object to be cut such as a weed, the object to be cut is pinched while being caught in the contact portion of the rotating body with a strong force, and is moved to the cutting edge of the cutter to be surely cut. It is sent backward, and at the same time is released from the pinched state. At this time, the weeds and the like after cutting have a simple structure in which the two support pipes extended above the rotating body are used for the pressing means of the rotating body. It does not pass through and is entangled with the rotating shaft in the support pipe, and is eliminated rearward without being entangled elsewhere.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

Two support pipes (21) and (22) extend downward from the lower part of the main body case (1) containing the motor and the reduction gear mechanism substantially in parallel, and these support pipes (21),
In (22), the upper end is firmly fixed to the main body case (1), and an appropriate portion such as an intermediate portion is firmly fixed by a fastener (3). The Nagai rotation shafts (41) and (42) are slightly inserted into the support pipes (21) and (22), and the balls attached to both ends of the support pipes (21) and (22). It is supported by a bearing (5). Rotating shaft (41),
At the upper end of (42), as shown in FIG. 2, a spur gear (61),
(62) is attached, and the spur gears (61) and (62) are engaged with another small diameter spur gear (63) and (64). The rotation of the motor is controlled by the worm gear (65) attached to the motor shaft (23) and the worm wheels (66), (67) meshing on both sides with the worm gear (65), and the worm wheels (66), (67) The small diameter spur gear (63), (64) coaxially mounted with the small diameter spur gear (63),
The speed is reduced by the reduction gear mechanism including the spur gears (61) and (62) meshing with (64) and transmitted to the rotating shafts (41) and (42).

As shown in FIG. 4, the lower ends of the rotating shafts (41) and (42) are inserted into holes formed in the central portions of the rotating bodies (71) and (72), and are fixed by screws (75). . As a result, the rotating bodies (71) and (72) are supported pipes (21) and (22)
While the outer peripheral surfaces are pressed against each other by the and the fastener (3), the gears are driven to rotate in opposite directions by the gear mechanism described above. When the mower is not in use, the screws (31) of the fastener (3) can be loosened to release both rotating bodies from the pressed state.

Next, the structure of the rotating bodies (71) and (72) will be described. The bases (73) and (74) have a cylindrical shape with flange-shaped protrusions (73a) and (74a) in the middle. Elastic bodies (76), (76) such as rubber, thermoplastic elastomer, etc., having a donut shape having an outer shape larger than the diameter of the flange-like protrusion, have a flange-like protrusion (73a),
It is fitted to the bases (73) and (74) so as to sandwich (74a). Then, the donut-shaped elastic body (76) is
3) To prevent slippage between (74) and locking pin (77)
Are donut-shaped elastic bodies (76), (76) and
a) and (74a). (79) is a holding plate. The rotating body (71), (7
The upper and lower donut-shaped elastic bodies (76) and (7)
A recess sandwiched between 6) is formed, which becomes the cutter storage spaces (71a) and (72a). Here, since the cutter storage space (71a) is a recess for storing the main part of the cutter as described later, the diameter of the flange-shaped protrusion (73a) is made smaller than that of the flange-shaped protrusion (74a). The cutter storage space (71a) is formed so as to be recessed deeper than the cutter storage space (72a). The reason why the donut-shaped elastic body (76) is chamfered in a truncated conical shape is that the object to be cut is easily entangled in the lower part of the rotating body, and the object to be cut is easily removed rearward in the upper part. In addition, recesses (73b) and (74b) are provided in the upper portions of the bases (73) and (74), and the lower ends of the support pipes (21) and (22) are inserted, so that the rotating shaft (41), Prevents weeds and other objects to be cut off (42). The diameters of the rotating bodies (71) and (72) do not necessarily have to be the same, but by adjusting the gear ratio of the reduction gear mechanism so that the outer peripheral velocities of both rotating bodies match,
It is desirable not to cause distortion at the press contact surface.

The cutter support (82) is an L-shaped bracket, one end of which is located slightly above the rotating body (71) and is fixed to the support pipe (21), and the other end is the rear side surface of the rotating body (71). It is bent to form a mounting part for the cutter (81).

As described above, in a state where the rotating bodies (71) and (72) are pressed, the outer peripheral portion is the elastic body (76), so that the contact surface is always formed even when the two rotating bodies face each other, And
The recess formed in the outer peripheral surface, that is, the cutter storage space (71
Since a) and (72a) are arranged so as to be continuous with each other at the contact surface, the continuous cutter storage space is eventually formed at the contact portion between the two rotating bodies by the upper contact surface (83) and the lower contact surface. (8
4) has a structure that sandwiches it. The cutter (81) is inserted into the continuous cutter storage space formed in this way, and the main part of the cutter (81) is inserted into the cutter storage space (71a) of the rotating body (71).
a), a virtual interpolation surface (85) between the upper contact surface (83) and the lower contact surface (84), separated vertically by (72a)
Of the cutter blade (81a) with respect to the storage space (71
The cutter base is fixed to the mounting portion of the cutter support (82) by being arranged so as to cross each other in (a) and (72a). The curved cutter edge (81a) intersects the virtual interpolation plane (85) and enters the cutter housing space (72a) of the rotating body (72), and the rear edge of the cutter edge forms a smooth curve. Go out of the rotating body (72).

With the above configuration, the handle portions (11) and (12) attached to the upper part of the main body case (1) are held, and the contact portions of the rotating bodies (71) and (72) that rotate opposite to each other are made of weeds or the like. When pressed against the object to be cut, the weeds and the like are immediately caught in the contact surfaces of the two rotating bodies, moved to the cutting edge (81a) of the cutter while being clamped, sent out reliably, and then sent out rearward. At this time, the cutter (81) is moved from the rotating body (71) containing the main part of the cutter to the other rotating body (7).
Although it is stored over 2), the cutting edge is drawn in a curved shape, and since it only enters the rotating body (72) shallowly, weeds and the like are removed smoothly without being entangled with the cutting edge. .

As is clear from the cutting mechanism of the present invention, the rotation speed of the rotating body is not particularly limited and can be arbitrarily selected from a low speed to a high speed according to the user's preference. It is preferable that the rotation speed is not less than the rotation.

In the contact portion between the rotating bodies (71) and (72), the upper contact surface (83) not only holds the object to be cut, but also serves to send out the cut piece after cutting backward. In the present embodiment, the size is the same as the lower contact surface (84). However, if the upper portions of both rotating bodies are increased in the height direction so that the upper contact surface (83) becomes larger, Can be further enhanced.

As described above, in this embodiment, in order to provide the cutter housing space in the rotating body, a configuration is adopted in which the donut-shaped elastic body sandwiches the flange-shaped protrusion from above and below, but of course, these are integrally formed by the elastic body. May be formed.

FIG. 6 shows a second embodiment. Conventionally known brush cutters are:
In general, a rotary blade is attached to a tip of a pipe having a rotating shaft, an engine or a motor is attached to a rear end, and an operation handle, a shoulder belt and the like are attached to a middle rear portion. An operator operates the handle while hanging the machine body with a belt to mow weeds in front, and this embodiment shows a case where the present invention is applied to such a method (only the tip portion is shown). .

The two support pipes are curved at a portion close to the rotating body, are bundled by the fixture (32), and are integrally formed. First
As in the embodiment, a rotating body, a cutter, a driving source, and the like are attached. The rotating shaft is not shown, but a flexible shaft is used, and the other configuration is the same as that of the above-described brush cutter. In the present embodiment, the tip is left and right (that is,
Weeding and the like are cut while swinging (in the figure, in the direction perpendicular to the paper).

In the first embodiment, if the two support pipes and the rotating shaft are shortened, the rotating bodies (71) and (72) can be sufficiently pressed with the strength of the support pipe even without the fixture (3). Can be kept. If the cutter support is designed to be attached to the lower side of the main body case, it can be used as a pruning machine for planting.

(Effect of the Invention) As described above, the present invention has a structure in which the cutting edge of the cutter is housed inside the rotating body, so that unlike the conventional brush cutter, the foot directly under the cutter as in the first embodiment. There is no danger of injuring the foot even when mowing the grass, and of course, there is no fear that the debris may damage the eyes by hitting a hard stone or the like. In addition, the two rotating bodies are driven by two rotating shafts supported by two supporting pipes, so that a weed or other object to be cut is entangled with a strong force, and only one is driven. The cutting ability is significantly improved as compared with the case of performing.

Since the outer peripheral side wall surface of the rotating body is a mechanism that cuts while holding and restraining the upper and lower portions of the cut point of the object to be cut, the rotating speed of the rotating body may be low, so that not only is it safe to handle but also the drive source The power is relatively small, and miniaturization is easy.

Since the rotating bodies elastically contact and rotate and do not contact the cutter, there is no friction at the cutting part,
There is no friction noise that tends to occur in a clipper-type pruner or the like, and it is very quiet. Further, since it is easy to remove and replace the cutter from the cutter support, handling is convenient and sharpness can always be maintained.

[Brief description of the drawings]

1 shows an embodiment of the present invention, FIG. 1 is a perspective view showing the whole of the first embodiment, FIG. 2 is an explanatory view showing a transmission mechanism using a reduction gear, and FIG. FIG. 4 is a lower front view including a cross section taken along the line II-II of FIG. 3, FIG. 5 is a lower left side view, and FIG. 6 is a left side view of a tip portion of the second embodiment. It is. (1) Body case, (21), (22) Support pipe,
(23) Motor shaft, (3) Fastener, (41), (42)
... Rotating shaft, (61)-(64) ... Spur gear, (65) ... Worm gear, (66), (67) ... Worm wheel, (71),
(72): Rotating body, (71a), (72a): Cutter storage space, (81): Cutter, (81a): Cutter edge, (8
2) Cutter support, (83) Upper contact surface, (84)
Lower contact surface.

Claims (3)

(57) [Claims] 1. A rotating body having a cutter housing space formed on an outer peripheral side wall is opposed to each other so as to be in contact with each other, and a lower end of a rotating shaft inserted into and supported by two support pipes is positioned at the center of each of the rotating bodies. Part, press the outer peripheral side walls of both rotators against each other to make contact with each other, insert a cutter into the cutter storage space formed in the contact part, and between the contact surfaces separated vertically by the storage space. With respect to the virtual interpolation plane, the cutter blade tip is disposed so as to intersect in the storage space, and a drive source and a transmission mechanism that branches and transmits the rotational force thereof,
A mowing machine characterized in that both rotating bodies are driven and rotated facing each other. 2. The reaper according to claim 1, wherein a cutter support is mounted below the support pipe. 3. The reaper according to claim 1, further comprising a fastening tool for fastening the two support pipes to each other.