JPH0649912Y2 - Small engine work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a handheld or backpacked small engine working machine.

[Conventional technology]

In a small engine work machine equipped with a cell starter type starter mechanism using a battery and a starter motor instead of the recoil starter mechanism, the throttle lever is operated while pressing the starter switch and rotating the starter motor when starting the engine. Since the and the throttle lever are provided separately, it was necessary to operate them individually. For example, at the time of starting, give a small opening for idle rotation with the throttle lever, open the engine stop switch, rotate the cell motor by pressing the cell starter switch, and if the start is successful, start from the cell starter switch. Release and raise the engine speed with the throttle lever. Also,
When stopping, set the throttle lever to the fully closed position, close the engine stop switch, and short-circuit the next side of the igniter to stop the engine.

[Problems to be solved by the invention]

In the prior art, the starter switch and the throttle lever have to be operated independently, and therefore, if unfamiliar, the opening of the throttle lever may be insufficient at the time of engine start and the start may be unsuccessful.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a small engine working machine capable of simultaneously and stably stopping the rotation of the starter motor by operating one throttle lever. .

[Means for Solving the Problems]

The small engine working machine of the present invention is operated only in conjunction with the throttle lever so that it is closed only in the range from the throttle idle position to the fully open position and the first contact and the fully closed position. A predetermined time from the battery to the starter motor based on the closing of the first contact when the throttle lever is operated from the fully closed position of the throttle to the idle opening position. And a short circuit for deactivating the igniter by closing the second contact when the throttle lever is in the fully closed position of the throttle. It has achieved its purpose.

Here, the timer device includes: a: a series circuit of a first resistor and a capacitor connected to the battery and a second resistor connected between both ends of the series circuit, and the throttle lever is at a fully closed position of the throttle. A trigger circuit that generates a trigger signal only when the charging current flows from the battery to the capacitor in response to the closing of the first contact when operated to the idle opening position, b: triggered by the trigger signal And a monostable multivibrator that produces a timed output signal over a preset time from the time when c: a relay device that charges the cell motor from the battery only while the output signal of the monostable multivibrator is present. It consists of, and.

[Action]

In the small engine work machine of the present invention, when the throttle lever is rotated from the fully closed position to the idle opening position of a small opening, the throttle is opened to the idle opening, and at the same time, the first contact linked with the lever is closed. Upon receiving the contact signal, the timer device is activated, and the cell motor is supplied with power from the battery for a preset time. The time period set in the timer device may be set to the shortest time period in which stable starting can be obtained according to the characteristics of each engine working machine, and may be variably adjusted as necessary.

That is, in the above timer device, the trigger circuit including the series circuit of the first resistor and the capacitor connected to the battery and the second resistor connected between both ends of the series circuit has the throttle lever fully closed. When operated from the position to the idle opening position, the trigger signal is generated only at the moment when the charging current flows from the battery to the capacitor in response to the closing of the first contact. The monostable multivibrator is
A timed output signal is generated for a preset time from the time of being triggered by the trigger signal, and the relay device supplies power to the starter motor from the battery only while the output signal of the monostable multivibrator is present. As a result, when the throttle lever is first operated from the fully closed position of the throttle to the idle opening position to close the first contact, the cell motor is started for a certain period of time. The contact only needs to change from the open state to the closed state once, and after that, even if the closed state is continued or returned to the open state, one start operation of the starter motor is performed. Regardless of the subsequent lever operation, the operation is always stable for a fixed time, and restarting is possible only by re-operating the lever after the elapse of the fixed time.

In this way, after the monostable multivibrator is triggered by the trigger signal from the trigger circuit,
Even if the contact remains closed, the capacitor is charged with the charging time constant (R ₂ · C ₁ ) determined by the first resistor and the capacitor, and the trigger terminal of the monostable multivibrator returns to the battery voltage level. It does not affect the operation of the monostable multivibrator. Further, when the lever is returned to the fully closed position, the charge time of the capacitor is longer than the charge time constant of the discharge time constant, that is, the time constant of the sum of the first and second resistors and the time constant {(R ₁ + R ₂ ) ・ C ₁ } is discharged, so even if the lever is operated to the idle position again during that time, a sufficient level of trigger signal cannot be obtained and the monostable multivibrator is affected by retriggering. Is prevented. This discharge time constant can be set according to the setting time constant of the monostable multivibrator,
Generally, it is set so that the trigger signal of a sufficient level can be obtained by reclosing the first contact after the time of the monostable multivibrator has elapsed, so that the start operation of the starter motor can be restarted after a certain time. You will be able to do it for the first time.

Further, in the present invention, since the interlock switch is interlocked with the throttle lever, the interlock switch is not used only for starting the starter motor, but the interlocking contact of another circuit, that is, the second contact is only at the fully closed position of the throttle. It is provided so as to be closed, and a short circuit that short-circuits the primary side of the igniter is formed by closing the second contact. Therefore, when the throttle lever is in the fully closed position, the primary side of the igniter is short-circuited by the second contact, so that the same throttle lever can perform the engine stop operation.

As described above, in the present invention, it is possible to control all of the working machine engine with only one throttle lever. However, in order to prevent danger, a mechanism for locking the lever at the fully closed position of the throttle lever is provided, or a separate main switch is provided. It is preferable that the battery can be detached.

〔Example〕

FIG. 1 is a circuit diagram of an ignition system of a small engine working machine according to an embodiment of the present invention, in which related components of a throttle lever portion are attached.

In the figure, a throttle lever 1 is pivotally supported by a lever shaft 2 and is for operating the throttle wire 3 by its rotation. The lever 1 provides the throttle fully closed at position a, the idle opening at b, and the throttle fully open at c, and switches SW ₁ and SW ₂ are provided in conjunction with this. One switch SW ₁ is a starter switch for the starter motor M, which is opened at position a and closed at positions b and c. The other switch SW ₂ is an engine stop switch, which is closed at position a and opened at positions b and c. B is a battery
P is a spark plug, G is an igniter, and igniter G
The primary side of the engine stop switch SW ₂ is short-circuited at the position a. Connected between the primary side of the igniter G and the battery B is a charging diode.

The timer device is indicated by the general symbol T, and starts its operation with a closing signal when the starter switch SW ₁ is switched from position a to position b, and supplies a current from the battery B to the starter motor M for a certain period of time. Then, after the lapse of the predetermined time, the operation of cutting off the energization is performed.

The timer device T is a monostable multivibrator MM that produces an output for a set time after the trigger input arrives.
And a trigger circuit (R ₁ , R ₂ , C ₁ ) that generates a trigger signal to the monostable multivibrator MM by closing the interlock switch SW ₁ , and a time constant circuit (R ₃ ,
C ₂ ), a relay RL operated by the output of the monostable multivibrator MM, and a relay contact r closed when the relay RL is operated.

In the embodiment of FIG. 1, a trigger pulse is applied to the trigger terminal t of the monostable multivibrator MM at the moment when the switch SW ₁ is closed by changing the throttle lever 1 from the position a to the position b, and the output is output to the output terminal Q. Appears, and this output continues for a time set by the circuit constant of the time constant circuit R ₃ · C ₂ and then disappears. While the output is present at the output terminal Q, the contact r remains closed due to the operation of the relay RL, and at the same time as the disappearance of the output, the contact r is opened. As a result, the starter motor M is supplied with electric power for the set time, and the engine stop switch SW ₂ is also opened, so that the engine is started. In this case, even if the switch SW ₁ remains closed after the first lever operation, the starter motor M always operates only for a fixed set time. That is, the starter switch SW ₁ is effective only when the starter switch SW ₁ is once opened and then closed again after the time period set by the timer has elapsed. Since the above operation is initiated by closing of the switch SW _1, a starter switch SW ₁ is in practice is sufficient as long momentarily closed during startup, toward the lever 1 to the fully open position c Operation Even if the operation is continued, there is no problem because the starter motor M is actuated for a certain period of time regardless of that. In the circuit example shown, the starter switch the function of the operation trigger circuit _{(R 1, R 2, C} 1)
It plays by creating a trigger signal by closing SW ₁ .
That is, the resistance R when the switch SW ₁ is closed the capacitor C ₁
Charging is performed via ₂ , and the trigger input terminal t temporarily drops from the battery voltage level due to the charging current of the capacitor C ₁ from the moment the switch SW ₁ is closed, and this becomes a negative pulse trigger signal. Stable multivibrator MM
Starts to work. In this case, if the charging of the capacitor C ₁ is completed even when the switch SW ₁ is closed, the trigger terminal t
Returns to the battery voltage level and does not itself affect the operation of the monostable multivibrator MM. If the lever 1 is returned toward the position a, the switch SW ₁ is opened charges the capacitor C ₁ is discharged through the resistor R _1, R _2, a capacitor C ₁ is returned to the original state. Switch SW
_{After 1} is opened once, monostable multivibrator MM
The closing of the switch SW ₁ after the elapse of the time limit of is effective, and the same operation can be repeated. This allows the starter operation to be redone.

It is needless to say that the timer device T is not limited to this embodiment and can be configured by using a simple delay relay circuit or the like.

[Effect of device]

As described above, according to the present invention, the start of the starter motor, the stop of the engine and the full speed operation control can be performed with only one throttle lever, and the starter of the starter motor is also performed by the timer device for a certain period of time. It can be stabilized without being affected by.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of an ignition system, which is a main part of a small engine working machine according to an embodiment of the present invention, together with a mechanism of a throttle lever portion. 1: Throttle lever, 2: Lever axis, 3: Throttle wire, M: Starter motor, B: Battery, SW ₁ : Starter switch, T: Timer device, MM: Monostable multivibrator.

Claims (1)

[Scope of utility model registration request] 1. A starting cell motor, an igniter for supplying a current pulse to an engine ignition plug, a battery as a driving power source for the cell motor, a throttle opening / closing range from fully closed to idle opening to fully open. In a small engine work machine equipped with a throttle lever for operating with, a first contact point that is closed only between an idle opening position and a fully open position of the throttle by being operated in conjunction with the throttle lever, An interlocking switch having a second contact closed only in a fully closed position; a series circuit of a first resistor and a capacitor connected to the battery; and a second resistor connected across the series circuit. The battery according to the closing of the first contact when the throttle lever is operated from the fully closed position of the throttle to the idle opening position. A trigger circuit that generates a trigger signal only at the moment when a charging current flows through the capacitor, a monostable multivibrator that generates a timed output signal over a preset time from the time when the trigger signal triggers the monostable, A relay device for supplying electric power from the battery to the starter motor only while the output signal of the multivibrator is present; and a short circuit of the igniter by closing the second contact when the throttle lever is at the fully closed position of the throttle. A small engine working machine comprising: a short-circuit circuit for deactivating.