JPH1094313A - Device for displaying proper rotation number area of brush cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the proper rotation number area displaying device of a brush cutter which anyone can use by a proper rotation number area in accordance with the kinds of respective brush cutting blades which are variously provided according to usage in a wide range in recent years. SOLUTION: The device 1 is applied to the brush cutter providing a brush cutting blade, a driving engine and a rod material and is provided with a connection terminal 1a taking a pulse signal from the ignition circuit of the engine, a detecting device 1b detecting the rotation number of the engine based on the pulse signal, an arithmetic device 1c which compares the rotation number of the engine from the detecting device 1b with the proper rotation number area of the brush cutting blade attached to a tip so as to output a signal indicating that the rotation number is within the proper rotation number area when it is within proper rotation number area and a display means 1d visually executing display based on the signal from the arithmetic device 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush cutter which is attached to a bush cutter and can inform an operator whether or not a bush blade attached to the bush cutter is used in a proper rotation speed range. The present invention relates to an appropriate rotation speed range display device for a paying machine.

[0002]

2. Description of the Related Art In recent years, the mechanization of agriculture has been promoted, and a so-called brush cutter has been used for cutting grassland, cutting shrubs of a river, cutting undergrowth of a forest, or cutting small-diameter miscellaneous trees.

[0003] In this brush cutter, a brush cutter blade is detachably attached to a distal end, and a drive engine is provided at a base end side.
A drive shaft and a rod member for holding the drive shaft are provided between the output shaft of the engine and the brush cutter, and a handle extends right and left between the rod members in a state substantially orthogonal to the rod members. Further, a shoulder belt is provided on the engine side of the handle portion.

[0004] Then, the operator hangs the above-mentioned shoulder belt on the shoulder, grasps the handle with both hands, and operates the throttle lever provided at one end of the handle to adjust the rotation speed appropriately. To do the mowing work.

As described above, in recent years, various mowing blades have been provided, and it is possible to cut from grass that fluctuates due to the wind to shrubs or miscellaneous trees of the size of the thumb. In addition, from the case where the ground is soil or sand, to the various grounds such as gravel or rocky ground,
Alternatively, various types of brush cutter blades have been devised, such as from a disk shape to a cross shape, so as to meet the purpose.

[0006] Specifically, when the grass is cut exclusively, it is preferable that the cutting blade has a sharp tooth profile from the viewpoint of workability. In particular, when cutting, the cut grass is cut to a predetermined shape. The brush cutter itself is configured so that it can be gathered in the direction.

[0007] In the case of cutting the shrub or the bushes, the tooth shape of the brush cutter is relatively obtuse, and a chip is embedded in the tooth portion, which is suitable for so-called heavy cutting.

When the ground is used in an environment such as gravel or a rocky area, a guard portion is formed below or at the tip of the tooth so that the brush cutter does not directly touch the ground.

In recent years, brush cutters with embedded diamond chips capable of cutting iron having a small diameter have also appeared.

[0010] Therefore, the appropriate rotation speed range varies considerably depending on the type of the brush cutter blade, and the operator is required to use the appropriate rotation speed range depending on the type of the brush cutter blade to be used.

[0011]

However, the object of using the brush cutter is not a person having technical knowledge like a factory worker, but a specialist in agriculture or forestry. Based on the type of brush cutter attached to the tip, changing the rotation speed of the brush cutter according to the type of the brush cutter, and expecting to use it in the proper rotation speed range Can not. In particular, since the engine sound itself (meaning the sound including the engine noise) itself varies depending on the engine maker, it is difficult to determine the rotational speed based on the engine sound.

[0012] For this reason, regardless of the type of the brush cutter, the brush cutter is currently used exclusively in the intuition of the operator or in the usual rotational speed range.

[0013] More specifically, although the mowing operation can be carried out efficiently and safely when used at 2000 to 3000 RPM, some use it at 1800 RPM, others use it at 3500 RPM, or 3500 RPM.
Despite the efficient and safe mowing operation when used at ~ 4000 RPM, some people have 2500 RPM.
Used at PM and some at 5000 RPM.

In such a mode of use, the performance provided by the brush cutter cannot be maximized, or the brush cutter is used beyond the design safety range.

[0015] In recent years, the use of each brush cutter, which has been provided in a wide range in accordance with its use, in an appropriate rotational speed range corresponding to the type, as in recent years, requires that the engine noise differs among manufacturers. Partly, it is not easy even for those with mechanical or blade expertise.

As described above, the inventor of the present invention has been able to use a brush cutter which can be used by anyone in an appropriate rotation speed range in accordance with the type of each brush cutter which has been widely provided in recent years in accordance with its use. It is an object of the present invention to provide an appropriate rotation speed range display device.

[0017]

According to a first aspect of the present invention, there is provided an apparatus for displaying a proper rotation speed range of a brush cutter, comprising a brush cutter at a distal end and a driving engine at a base end side, the engine being provided. A drive shaft and a rod member holding the drive shaft between the output shaft of the brush cutter and the brush cutter blade. A connection terminal that picks up a pulse signal from an ignition circuit that supplies electricity, and a detection device that is connected to the connection terminal and detects the engine speed based on the pulse signal,
An arithmetic device that compares the engine speed from the detection device with the appropriate speed range of the brush cutter attached to the tip and, when the speed is in the appropriate frequency range, issues a signal to that effect; Display means for visually displaying based on the above-mentioned signal from the arithmetic unit.

According to the apparatus for displaying the appropriate rotation speed range of the bush cutter constructed as described above, a person or the like who provides the bush cutter can use the brush cutter unique to the bush blade displayed in the instruction manual or the like. Based on the appropriate rotation speed range, if a proper rotation speed range display device that can display the appropriate rotation speed range that matches the brush cutter is attached to the brush cutter, when using it, if it is used according to the display of the display device The use of the brush cutter in the optimum speed range is guaranteed. As a result, an optimal mowing operation can be performed, and the operation can be performed safely. In addition, with this configuration, the appropriate rotation speed range can be visually confirmed even under the noise caused by the engine and the work, so that even a hearing-impaired person can surely grasp the appropriate rotation speed range.

According to a third aspect of the present invention, there is provided an appropriate rotation speed range display device for a brush cutter, comprising a brush cutter at a distal end, a drive engine at a base end, and an output shaft of the engine. A proper rotation speed range display device for a brush cutter applied to a brush cutter having a drive shaft and a rod member holding the drive shaft between the brush cutter and the brush cutter, wherein high-voltage electricity is supplied to a spark plug of the engine. A connection terminal for picking up a pulse signal from the ignition circuit, a detection device connected to the connection terminal for detecting the number of revolutions of the engine based on the pulse signal; An arithmetic unit that issues a warning signal when the rotation speed is out of the appropriate rotation speed region by comparing the rotation speed region with the appropriate rotation speed region of
Alarm means for issuing an alarm based on the alarm signal from the arithmetic unit.

According to the apparatus for displaying the appropriate rotation speed range of the bush cutter constructed as described above, a person who provides the bush cutter can check the proper rotation speed of the bush displayed in the instruction manual or the like. If a proper rotation speed range display device that can display the proper rotation speed range that matches the brush cutter blade is attached to the brush cutter based on the appropriate rotation speed range, the alarm of the display device will not be issued during use. The use of the brush cutter in the optimum rotational speed range is assured. As a result, an optimal mowing operation can be performed, and the operation can be performed safely.

[0021]

FIG. 1 is a block diagram showing an apparatus for displaying a proper rotation speed range of a brush cutter according to a first embodiment of the present invention;
When the visual display means is constituted by a green lamp as in the invention described above, a safe, that is, a proper rotation speed range display device of the brush cutter in which the proper rotation speed range can be easily visually recognized.

Further, if the alarm means is constituted by a red lamp as in the invention according to the fourth aspect of the present invention, the appropriate rotation speed range display device for the brush cutter according to the third aspect of the present invention will be described until the red lamp is turned on. The device is easy to use for the operator because it can be used without any care, that is, it can be used depending on its own intuition until it is turned on.

Further, if the alarm means is constituted by an alarm buzzer as in the invention according to the fifth aspect of the present invention, the operator can visually recognize the appropriate rotation speed range display device of the brush cutter according to the third aspect of the present invention. Is excellent in that it is open, that is, it allows the user to gaze only at the object to be reaped, especially when the display is displayed as an alarm, that is, when a negative display mode is adopted, the user becomes audible The display becomes an excellent display form.

[0024]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an apparatus for displaying a proper rotation speed range of a brush cutter according to the present invention.

FIG. 1A is a perspective view showing the outer shape of a proper rotation speed range display device of the present brush cutter, and FIG. 1B is a schematic configuration of the proper rotation speed range display device of the brush cutter shown in FIG. FIG. 2 is a circuit diagram showing the detailed block diagram of the block diagram shown in FIG. 1 (b), and FIG. 3 is a perspective view showing a state in which a proper speed range display device is provided in a well-known brush cutter. is there.

As shown in FIG. 1 (a), in this embodiment, the appropriate rotation speed range display device 1 of the brush cutter has a substantially rectangular parallelepiped shape of a main body portion having a shape similar to that of a cigarette box. Three display lamps 2 are provided. The three lamps are a red lamp 2A at the right end, a green lamp 2B at the center, and a yellow lamp 2C at the left end.

The proper rotation speed range display device 1
In the case of the present embodiment, as shown in FIG. 3, the handle 11 is attached to the surface of an attachment fitting 12 for attaching the handle 11 to the rod member 10 of the brush cutter A, and as shown in FIG. Brush cutter A
Holds in a predetermined state, the display lamp 2 of the appropriate rotation speed range display device 1 becomes a position where the display lamp 2 can be seen naturally.

FIG. 1B is a block diagram showing the configuration of the proper rotation speed range display device 1. As shown in FIG. 1B, it is connected to an ignition circuit of the engine E (a high-pressure ignition cord in this embodiment). Connection terminal 1a and its connection terminal 1a
, A computing device 1c electrically connected to the detecting device 1b, and a display device 1 electrically connected to the computing device 1c and capable of displaying the display lamp.
d, and a power supply 1e connected to the detection device 1b via a switch SW.

More specifically, the proper rotation speed range display device 1 is configured as an electric circuit as shown in FIG. That is, in this electric circuit, the connection terminal 1a, the detection device 1b, the arithmetic device 1c, and the display device 1
d and the power supply 1e are as shown in FIG. Further, the display device 1d is provided with three display lamps 2 as described above.

In FIG. 3, a throttle lever connected to the carburetor portion of the engine by a wire is disposed on a grip on the right hand side of the handle 11 so that the rotation speed of the brush cutter can be freely adjusted with the right hand. Have been.

A driving engine E is provided at the base end of the brush cutter A, and its output shaft is connected to a distal end of the brush cutter A via a driving shaft extending inside the rod member 10. The brush cutter 13 is configured to rotate.

The proper rotation speed range display device of the present brush cutter constructed as described above operates as follows in use.

That is, the mowing blade (for example, when the appropriate rotation speed range is 2500) suitable for the appropriate rotation speed range display device (appropriate rotation speed range display device in which the appropriate rotation speed range is set to 2500-3500 RPM). Up to 3500 RPM brush cutter) 13
Is attached to the tip of the brush cutter A, the worker holds the brush cutter A in a predetermined state, starts the engine E,
When rotating at a predetermined rotation, for example, 1200 RPM, the yellow lamp 2C of the appropriate rotation speed range display device 1 is turned on. When the operator visually recognizes the yellow lamp 2C, it is known that the brush cutter 13 is currently rotating at a rotation speed lower than a predetermined rotation speed range. In such a case, the throttle lever is operated by operating the right-hand throttle lever. I just need to raise it. And, temporarily,
The operation of the throttle lever is too large,
When the number of revolutions reaches 4000 RPM, the red lamp 2A of the appropriate revolution number range display device 1 is turned on. Therefore, in such a case, the operator only has to operate the throttle lever in the returning direction. That is, the operator only has to perform an operation to return the throttle lever until the display lamp 2 changes from the red lamp 2A to the green lamp 2B.

As a result, a state in which the brush cutter A rotates in an optimum number of times for the brush cutter blade 13 is obtained.
It is possible to work in the most efficient and safe state of mowing.

In the above-described embodiment, the description has been given of the proper rotation speed range display device in which the proper rotation speed range is fixed. It may be of a type that can be set freely according to the mower blades that use the area, and it goes without saying that this configuration is more excellent in terms of versatility.

Further, as another embodiment of the above-described embodiment, substantially the same operation and effect can be obtained even if the red lamp is turned on only when the rotation speed is out of the proper rotation speed range. In such a case, instead of the lamp display,
The display may be made with an alarm buzzer.

[0037]

According to the apparatus for displaying the proper rotation speed range of the brush cutter according to the present invention, the operator can easily obtain the proper rotation speed range of the brush cutter every time the work is performed. The mowing operation can be performed in the most efficient state and the safe state.

Further, even if there is no knowledge about the bush cutter, it is possible to carry out a proper bush removal operation by setting the proper rotation speed range display device corresponding to the bush cutter in the bush cutter. In particular, in the present day when there are many types of mowing blades, and also for agricultural or forestry workers who are not related to mechanical or blade knowledge, an excellent operation and effect can be provided in that appropriate work can always be easily provided.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an outer shape of a proper rotation speed range display device of the present brush cutter, and FIG. 1B is a block diagram showing a schematic configuration of a proper rotation speed range display device of the brush cutter shown in FIG. FIG.

FIG. 2 is a circuit diagram showing a detailed circuit of the block diagram shown in FIG.

FIG. 3 is a perspective view showing a state in which a proper speed range display device is provided in a well-known brush cutter.

[Explanation of symbols]

 A: Brush cutter E: Engine 1 ... Appropriate rotation speed range display device 1a ... Connection terminal 1b ... Detection device 1c ... Computing device 1d ... Display device (display means) 1e ... Power supply 2A ... Red lamp 2B ... Green lamp 10 ... Rod member 13 ... Cutting blade

Claims (5)

[Claims] 1. A brush cutter is provided at a distal end, a drive engine is provided at a base end side, and a drive shaft and a rod member for holding the drive shaft are provided between an output shaft of the engine and the brush cutter. A proper rotation speed range display device of a brush cutter applied to a brush cutter, comprising: a connection terminal that picks up a pulse signal from an ignition circuit that supplies high-voltage electricity to a spark plug of the engine; A detecting device for detecting the engine speed based on the pulse signal, and comparing the engine speed from the detecting device with the proper speed range unique to the mowing blade attached to the tip, to compare the engine speed. When the number of times is within the appropriate number of times, a computing device for issuing a signal to that effect, and display means for visually displaying based on the signal from the computing device to the effect, the proper rotation of the brush cutter. Numerical display. 2. An apparatus according to claim 1, wherein said visual display means is a green lamp. 3. A mowing blade is provided at a distal end, a driving engine is provided at a base end side, and a driving shaft and a rod member for holding the driving shaft are provided between an output shaft of the engine and the mowing blade. A proper rotation speed range display device of a brush cutter applied to a brush cutter, comprising: a connection terminal that picks up a pulse signal from an ignition circuit that supplies high-voltage electricity to a spark plug of the engine; A detecting device for detecting the engine speed based on the pulse signal, and comparing the engine speed from the detecting device with the proper speed range unique to the mowing blade attached to the tip, to compare the engine speed. Characterized in that it comprises a calculating device for issuing a warning signal when the value is out of the proper number range, and warning means for issuing a warning based on the warning signal from the calculating device. Numerical display. 4. An apparatus according to claim 3, wherein said alarm means is a red lamp. 5. An apparatus according to claim 3, wherein said warning means is a warning buzzer.