JPH09233929A - Motor-driven reaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor-driven reaper with which structure is simplified, the property of chamfering to grass stalks is improved and operability is improved by transmitting the rotational force of a driving shaft forcedly rotated in one direction to a reaping blade rod fitting a reaping blade as forward rotational force, etc. SOLUTION: The rotational force of a driving shaft 55 forcedly rotated in one direction is transmitted to a reaping blade rod 56, to which a reaping blade 53 is fitted, as forward or backward rotational force by a forward/ backward propagating mechanism 57. In this case, the forward/backward transmission mechanism 57 fixes two planar gears 58 and 59 to the driving shaft 55 while facing them, the driving shaft 55 can be axially moved and it is preferable that the reaping blade rod 56 is put between the planar gears 58 and 59 and a rod gear 67 to be selectively engaged with any one of planar gears 58 and 59 through the move of the driving shaft 55 is formed at that part putting in the reaping blade rod.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable power brush cutter.

[0002]

2. Description of the Related Art FIG. 10 is a perspective view of a power brush cutter (hereinafter referred to as a brush cutter). The brush cutter has a transmission case b and an engine c attached to front and rear ends of an operating rod a. In this case, a cutting blade shaft (not shown) for attaching a cutting blade d is vertically installed in the transmission case b, and the cutting blade shaft is driven by the engine c and inserted into the operating rod a ( Power is transmitted by (not shown). Thus, the brush cutter is carried by being suspended from the shoulder or the like, and the grass is cut while rotating the cutting blade d and swinging the handle e provided in the middle of the operating rod a.

Since the cutting blade of such a brush cutter is usually set to rotate counterclockwise when viewed from above (hereinafter, rotation in this direction is referred to as forward rotation), the brush cutter is swung from right to left. While mowing the grass, the cutting blade has a better bite on the stalk and has better mowing performance. When mowing in this direction, the mowed stems will naturally be emitted to the left side of the operator.

Therefore, when mowing a ridge having a paddy field or the like on the left side, the cut grass stem is thrown into the paddy field. In addition, the rice planted in the paddy fields may be cut off. To prevent this, it is sufficient to swing from right to left, but if the cutting blade is normally rotated as described above, the cutting performance is poor with swinging in this direction, as described above.

[0005]

[0006]

In order to achieve the above object, in the present invention, a forward / reverse transmission mechanism directly applies a rotational force of a drive shaft, which is forcibly rotated in one direction, to a cutting blade shaft to which a cutting blade is attached. Provided is a power brush cutter characterized by being transmitted as a rolling torque or a reverse torque. Further, there is provided a power brush cutter characterized in that a back and forth movement of a drive shaft is performed by an operation mechanism provided at hand.

Further, according to the present invention, the forward / reverse transmission mechanism fixes two surface gears to the drive shaft so as to oppose each other, and the drive shaft is configured to be movable in the axial direction. A structure in which a bar gear is formed that is inserted between the gears and selectively engages with one of the surface gears by the movement of the drive shaft in the protruding portion.
The two surface gears are opposed to the drive shaft and integrally mounted so as to be movable in the axial direction, and the cutting blade shaft is inserted between the surface gears, and the surface gear is moved to the protruding portion by the movement of the surface gears. A configuration in which a bar gear that selectively meshes with one is formed,
In addition to fixing the two surface gears facing the drive shaft, the cutting blade shaft is configured to be movable in the axial direction of the drive shaft, and the cutting blade shaft is inserted between the surface gears to cut the protruding portion. A configuration is provided in which a bar gear that selectively meshes with one of the surface gears is formed by the movement of the blade shaft.

Then, either the surface gear or the bar gear is moved by an operating mechanism provided on the proximal side of the operating rod that houses the drive shaft, and either the surface gear or the bar gear is moved. , And also provides a configuration that is performed by an operation mechanism provided in a transmission case that houses the cutting blade shaft.

By adopting the above means of the present invention, the forward / reverse transmission mechanism is provided between the drive shaft and the cutting blade shaft, and the increase in weight is at the tip of the operating rod, and this type of brush cutter is used for cutting. Considering that the work may be done while the blade is grounded,
This isn't too difficult to control.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a brush cutter showing an example of the present invention. The brush cutter of the present invention has an operating rod 5
0, the transmission case 51, the engine 52, the cutting blade 53, the handle 54 and the like are the same as those described above.

FIG. 2 is a partial sectional view of a transmission case showing an example of the forward / reverse transmission mechanism, and FIG. 3 is a partial sectional view of the operating rod.
A drive shaft 55 forcibly rotated in one direction by an engine 52 is inserted in the operating rod 50, and a cutting blade shaft 56 for fixing a cutting blade 53 is vertically provided in the transmission case 51. . In the present invention, the power of the drive shaft 55 is the cutting blade shaft 56.
Further, it is transmitted as a forward rotation force or a reverse rotation force by the forward / reverse transmission mechanism 57. Thus, the forward / reverse transmission mechanism 57 is
It is provided in a transmission case 51 into which the tip of the operating rod 50 is projected.

The forward / reverse transmission mechanism 57 shown here is constructed as follows. First, the two surface gears 58 and 59 are opposed to and fixed to the drive shaft 55, and
Is configured to be movable in the axial direction (FIG. 2). That is, the drive shaft 5
5 is supported by a bearing 60 in the operating rod 50, and the drive shaft 55 is constructed so as to be able to be pushed and pulled with respect to the bearing 60.

Next, the rear portion of the drive shaft 55 (handle 5
4) is divided, and a rear portion extending from this is made immovable in the axial direction and extending from the engine 52. Then, both sides of the divided portion are connected by a coupling 61, and even if the front drive shaft 55 is axially moved, the rotational force is transmitted to this (FIG. 3).

The forward / reverse transmission mechanism 57 described above is operated by the following operation mechanism 66. In the operation mechanism 66 in this example, the drive shaft 55 of the moving portion is held by the holder 63 via the bearing 62.
The holding lever 63 is provided with a switching lever 65 projecting to the outside through a guide hole 64 formed in the operating rod 50.

On the other hand, the cutting blade shaft 56 is extended upward so as to protrude between the surface gears 58 and 59, and the surface gear 5 is inserted into this protruding portion.
A bar gear 67 capable of meshing with 8, 59 is formed. Accordingly, the drive shaft 55, that is, the two surface gears 58 and 59.
Is axially moved, the bar gear 67 will engage with one of these alternatively.

The cutting blade shaft 56 is rotatably held by the bearing 68 with respect to the transmission case 51, and the cutting blade 53 is fixed to the lower end of the cutting blade shaft 56 via a pinching metal fitting 69 and a winding prevention cup 70. It

As described above, when the switching lever 65 is moved back and forth in the guide hole 64, the rod gear 67 and the surface gears 58 and 59 are formed.
And the rotation direction of the cutting blade 53 is switched between forward and reverse. Since the switching lever 65 needs to maintain its position at the forward rotation position and the reverse rotation position of the end of the guide hole 64, the switching lever 65 moves laterally at these both end positions and is movable in a plan view to enable it. It is preferable to have a letter shape (Fig. 1). It is also possible to take a neutral position in which the cutting blade 53 is not rotated, and in this case, the guide hole 64 may be E-shaped.

Forward / reverse transmission mechanism 57 for reversing the cutting blade 53 in the forward / reverse direction.
The following can also be considered. FIG. 4 is a partial cross-sectional view of the transmission case showing the main part thereof. In this example, the two surface gears 58 and 59 are connected to each other so that they can be axially moved integrally with the drive shaft 55. Then, this is operated by the operating mechanism 66.

In this case, the operating mechanism 66 is the transmission case 5
1 is provided with a switching lever 71, and the pin 72 thereof is linked to the surface gears 58 and 59. When the switching lever 71 is operated, the surface gears 58 and 59 move to change the meshing with the bar gear 67, and the rotation direction is also changed. As will be described later, the operating mechanism 66 can be provided on the side closer to the operating rod 50.

Further, as the forward / reverse transmission mechanism for reversing the cutting blade 53 in the forward and reverse directions, the following one can be considered. 5 is a perspective view of the brush cutter according to the present embodiment, FIG. 6 is a cross-sectional view of the transmission case, and FIG.
[Fig. 4] is a perspective view of a partially modified brush cutter.

In these figures, reference numeral 4 is a transmission case provided at the tip of the operating rod 1, and a forward / reverse transmission mechanism 5 is provided inside the transmission case.

The forward / reverse transmission mechanism 5 is specifically constructed as follows. That is, the drive shaft 6 inserted in the operating rod 1
Two surface gears 7 and 8 are provided opposite to each other so that their teeth face each other.

In the lower part of the transmission case 4, two guide support rods 9 and 9 are horizontally arranged along the drive shaft 6, and a slide body 10 is reciprocated in the front-rear direction on the guide support rods 9 and 9. Guide to move freely.

A vertical through hole 10 is provided at the center of the sliding body 10.
In order to form a, a vertically oriented cutting blade shaft 11 is rotatably mounted at a fixed position inside the through hole 10a via a bearing 12 and the like. At this time, the cutting blade shaft 11 is formed with a bar gear 13 on the upper part, which is selectively meshed with the surface gears 7, 8, and the cutting blade 3 is fixed on the lower part.

An overhanging input member 15 is fixed to one side surface of the sliding body 10 so that the tip end of the overhanging input member 15 can be projected outward from a lateral hole 16 provided in the transmission case 4, and the other side thereof. An elastic pressure locking mechanism 17 for locking the sliding body 10 at three specific positions on a line along the guide support rod 9 is provided on the side surface of the.

At this time, the elastic pressure locking mechanism 17 inserts the spring 18 into the hole provided at a specific position of the transmission case 4 and presses the ball 19 by the spring 18.
And the recesses 20 into which the balls 19 are selectively fitted are formed at the three specific positions of the sliding body 10.

Further, the springs 21 and 22 are compressedly fitted to the respective guide support rods 9 which are the front and rear portions of the sliding body 10, and at this time, the spring 22 on the rear side is more than the spring 21 on the front side. It is supposed to exert a large pressing force.

By the way, the cutting blade 3 includes cemented carbide (tip saw) and high-speed cutting blade, but in general, the cutting edge is usually formed so as to be processed in a constant rotation direction. However, the cutting blade 3 used in the present invention needs to have a cutting edge provided with a front blade 3a and a rear blade 3b so as to be able to cope with both rotation directions (this point can be applied to the above two examples. That is).

Reference numeral 23 denotes an operation mechanism for switching the forward / reverse transmission mechanism 5 as described above to the normal or reverse rotation state of the cutting blade 3, which is specifically as follows.

That is, the operating lever 24 is attached to the proximal portion of the operating rod 1.
Is mounted via a support shaft 25 so as to be swingable and displaceable along a longitudinal surface in the front-rear direction, and the upper part is slightly tilted to the left and right.

A locking guide plate 26 is provided in association with the operating lever 24. The guide plate 26 has an arcuate shape as a whole, and the operating lever 24 extends in the longitudinal direction thereof.
A long hole 27 for guiding the forward and backward swing of the operating lever 24 is formed at three specific positions in the longitudinal direction of the long hole 27.
c is provided.

Thus, the projecting piece 28 provided at the lower end of the operating lever 24 and the overhanging input member 15 of the forward / reverse transmission mechanism 5 are interlockingly connected to each other. As shown in FIG. 1
Inner 29a guided by the outer 29 attached along the
Alternatively, the two may be directly connected by the operation wire 30 as shown in FIG.

In these figures, 31 is a handle, 32 is a metal fitting for hanging a shoulder belt, and 33 is a shatterproof plate.

An example of the use of the brush cutter having such a structure and its operation will be described. When the brush cutter 3 is used in a state of normal rotation, the operating lever 24 is swung to the front f1 to move the front lever. Engage in the stop groove 27a and hold its position.

At this time, the operation lever 24 swings when the inner 2
9a or the operation wire 30 is pulled rearward against the pressing force of the spring 22, and in connection with this, the sliding body 10 is displaced rearward and its position is stabilized by the elastic force locking mechanism 17. Therefore, the bar gear 13 is surely engaged with the rear surface gear 8.

As a result, the rotation of the engine 2 causes the cutting blade 3 to rotate in the normal direction, and the cutting blade 3 rotates in the direction of the arrow f3. Therefore, the brush cutter is used in the same manner as the conventional one, and the mowed grass is cut. Etc. are dispelled to the left side of the worker.

On the other hand, when the cutting blade 3 is used in a state of being reversed, the operating lever 24 is swung rearward f2 so as to be engaged with the rear locking groove 27c and hold its position.

At this time, the operation lever 24 swings when the inner 2
9a or the operation wire 30 is allowed to move forward within a certain range. Therefore, the sliding body 10 is displaced forward by the pressing force of the spring 22, and its position is stably maintained by the elastic force locking mechanism 17, The gear 13 is reliably meshed with the front surface gear 7.

As a result, the rotation of the engine 2 causes the cutting blade 3 to rotate in the reverse direction, and the cutting blade 3 rotates in the direction of the arrow f4. Therefore, when the brush cutter is used, the operator operates the operating rod 1. The grass or the like can be cut in the process of swinging from the left side to the right side. Therefore, the cut grass or the like is thrown away to the right side of the worker.

In order to prevent the rotation of the engine 2 from being transmitted to the cutting blade 3, the operating lever 24 is erected and swung to the neutral position, and is engaged with the locking groove 27b at the center. To hold.

At this time, the operating lever 24 stably holds the inner 29a or the operating wire 30 and the sliding body 10 at a specific position corresponding to the neutral position, and the rod gear 13 is used to rotate any of the surface gears 7 and 8. Therefore, the rotation of the engine 2 is not transmitted to the cutting blade 3.

FIG. 8 shows a modified example of the operating mechanism of the above-mentioned embodiment, and its concrete structure is as follows.

Instead of the overhang input member 15 of the above embodiment,
An operating rod 34 is mounted on one side surface of the sliding body 10 so as to be vertically swingable via a support shaft 35, and its operating portion is projected outward from the lateral hole 16 and urges the rod 34 upward. A suitable spring 36 is provided for

Then, engaging grooves 16a, 16b, 16c are formed at three specific positions in the longitudinal direction of the lateral hole 16.

In such a structure, when the cutting blade 3 is normally rotated, the operation rod 34 is moved rearward to be locked in the rear locking groove 16c. At this time, the operation rod 34 is moved. The elastic state of the spring 36 stably holds the locked state.

In this state, by the same operation as described above,
The bar gear 13 is surely meshed with the rear surface gear 8 so that the cutting blade 3 rotates normally.

On the other hand, when the cutting blade 3 is rotated in the reverse direction, the operating rod 34 is moved forward to be locked in the front locking groove 16a. In this state, the same operation as described above is performed. The bar gear 13 is surely meshed with the front surface gear 7, and the cutting blade 3 is reversed.

The operation rod 34 is moved to the neutral position,
When locked in the central locking groove 16b, the bar gear 13 is stably held in a state where it does not mesh with any of the surface gears 7 and 8 as described above, and the rotation of the engine 2 is not transmitted to the cutting blade 3.

In the above embodiment, the operating wire 3 shown in FIG.
0 can be replaced by a connecting rod, in which case the extension force of the spring 22 is applied to the other spring 2.
It is not necessary to consider making it larger than that of 1.

In FIG. 8, the operating rod 34 is oriented laterally. However, as shown in FIG. 9, the operating rod 34 is erected and its operating portion is extended upward from the long hole 16 provided in the upper surface of the transmission case 4. It is also possible to use it in accordance with the above-mentioned place by letting it out, and by doing so, grass and the like are less likely to get entangled with the operating rod 34 when the operating rod 1 is swung, and it is easy to use. Become.

[0051]

According to the present invention constructed as described above, the cutting blade can be rotated forward and backward as required. Therefore, in order to improve the biting property on the grass stem, in addition to the conventional method of swinging the operating rod from right to left while rotating the cutting blade to the left,
It is also possible to use it by rotating the cutting blade clockwise while swinging the operating rod from left to right.

Since the forward / reverse transmission mechanism of the cutting blade which enables this is incorporated in the transmission case, it is possible to maintain a good weight balance state in which the rear portion of the operating rod is not made heavy. Further, since the forward / reverse transmission mechanism is interposed between the drive shaft and the cutting blade shaft, it does not require an extra shaft or gear, and is simple and lightweight. Since the operation mechanism for operating is provided on the hand side as needed, various effects such as being operable during work and not impairing operability can be expected.

[Brief description of drawings]

FIG. 1 is a perspective view of a brush cutter showing an example of the present invention.

FIG. 2 is a partial cross-sectional view of a transmission case showing an example of the present invention.

FIG. 3 is a partial cross-sectional view of an operating rod showing an example of the present invention.

FIG. 4 is a partial cross-sectional view of a transmission case showing another example of the present invention.

FIG. 5 is a perspective view of a brush cutter showing another example of the present invention.

6A and 6B show a front end portion of an operating rod showing another example of the present invention, in which A is a front sectional view and B is a side sectional view.

FIG. 7 is a perspective view of a brush cutter showing another example of the present invention.

FIG. 8 is a perspective view showing a modified example of the extension input member showing another example of the present invention.

FIG. 9 is a perspective view showing another modification of the overhang input member showing another example of the present invention.

FIG. 10 is a perspective view of an example of a conventional brush cutter.

[Explanation of symbols]

 1, 50 Operating rod 3, 53 Cutting blade 4, 51 Transmission case 5, 57 Forward / reverse transmission mechanism 6, 55 Drive shaft 7, 8, 58, 59 Surface gear 10 Sliding body 11, 56 Cutting blade shaft 13, 67 Bar gear 23, 66 operation mechanism 24 operation lever

Claims (7)

[Claims] 1. A power characterized in that a rotational force of a drive shaft forcibly rotated in one direction is transmitted as a forward rotation force or a reverse rotation force to a cutting blade shaft to which a cutting blade is attached by a forward / reverse transmission mechanism. Brush cutter. 2. The forward / reverse transmission mechanism according to claim 1, wherein two surface gears are fixed to a drive shaft so as to face each other, the drive shaft is configured to be movable in the axial direction, and the cutting blade shaft is connected to the surface gear. A power brush cutter characterized in that a bar gear which is made to rush between and is selectively meshed with one of the surface gears by the movement of the drive shaft is formed in the rush portion. 3. The forward / reverse transmission mechanism according to claim 1, wherein the two surface gears are attached to the drive shaft so as to be opposed to each other and integrally mounted so as to be axially movable, and the cutting blade shaft is provided between the surface gears. A power brush cutter characterized in that a bar gear which is selectively engaged with one of the surface gears is formed in the protruding portion by the movement of the surface gear. 4. The forward / reverse transmission mechanism according to claim 1, wherein two surface gears are opposed to and fixed to the drive shaft, and the cutting blade shaft is configured to be movable in the axial direction of the drive shaft. A power brush cutter characterized in that a blade gear is formed between the surface gears, and a bar gear that selectively engages with one of the surface gears is formed in the protruding portion by the movement of the cutting blade shaft. 5. A power brush cutter, wherein the drive shaft according to claim 2 is moved by an operating mechanism provided on a hand side of an operating rod that houses the drive shaft. 6. A power brush cutter, wherein any one of the surface gear and the rod gear according to claim 3 or 4 is moved by an operation mechanism provided on a hand side of an operation rod which houses a drive shaft. 7. A power brush cutter, wherein any one of the surface gear and the rod gear according to claim 3 or 4 is moved by an operation mechanism provided in a transmission case that houses a cutting blade shaft.