JPH0436597Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a safety engine starting device for pruning machines that allows the transmission mechanism to automatically return to the neutral position when the engine is started, allowing the engine to be started safely. It is.

(b) Conventional technology Conventional pruning machines are equipped with a dedicated engine start switch that can be disconnected between the power source and the engine, and by connecting this engine start switch, power is supplied from the power source to the engine to start the engine. This engine is designed to only start the engine, and in addition to driving the chain saw equipped with the engine power, it also controls the drive wheels via a transmission mechanism that can shift from a neutral position to a forward or reverse position in conjunction with the shifting operation of the transmission lever. It was driven in forward and reverse directions.

(c) Problems to be solved by the invention Therefore, according to this type of pruning machine, when the machine is attached to the lower part of a tree trunk and the engine is started, the gear shift lever is switched to the forward rotation position or the reverse rotation position. If you forget that it is on, the drive wheels will rotate forward at the same time as the engine starts, causing a sudden start and causing injury to the worker.
There were problems such as the wheels being driven in reverse, causing the wheels to fall off and injuring workers with chainsaws, or slipping and damaging the surface of the trunk.

In addition, even if the aircraft ascends and descends from the trunk without such trouble, if the engine stalls during the ascending and descending,
Since the transmission mechanism is in the normal rotation position or the reverse rotation position, the stopped engine acts as a brake and the drive wheels come to a stop at the engine stall position. Therefore,
Even when the engine stalls, the operator climbs a tree and connects the engine start switch to restart the engine and allow the aircraft to continue moving up and down. If the aircraft was forgotten to return to the neutral position, the aircraft would begin to ascend and descend upon restart, which was dangerous.

(d) Means to solve the problem Therefore, this invention provides an engine start switch that can be disconnected between the power source and the engine, and switches the engine power between the forward rotation position, neutral position, and reverse rotation position. In the pruning machine, the transmission is transmitted to the drive wheels through a transmission mechanism that can be used, and the transmission mechanism is configured to be electrically changeable through an electrical transmission operation device, wherein the engine start switch and the electric transmission operation device are connected to the pruning machine. and by connecting the engine start switch, the engine is started and at the same time an electric signal for preferentially switching the transmission mechanism to the neutral position is input to the electric transmission operating device. It is something.

(E) Effect With the above configuration, the engine can be started by simply switching the engine start switch to the connected side, and at the same time, the engine can be automatically returned via the electric shift operation device.

(F) Embodiments Hereinafter, preferred embodiments of this invention will be described in detail by way of example with reference to the drawings.

As shown in FIG. 1, the engine safety starting device for a pruning machine includes an engine starting switch 1, a power source 2, an electric speed change operation device 5 for electrically changing speeds of an engine 3, and a speed change mechanism 4, and a power source 2. By switching the engine start switch 1 to the connection side, the engine 3 is started, and at the same time, an electric signal is input to the electric shift operation device 5, and the transmission mechanism 4 is controlled via the shift operation device 5. It is configured so that it can be switched to the neutral position preferentially.

As the power source 2, a battery or the like is used, and as the engine 3, one having a generator (not shown) is used.

The engine start switch 1 is a main switch 1a provided between a power source 2 and an engine 3 and capable of being disconnected.
and a gear shift priority switch 1b provided between the power source 2 and the gear shift operating device 5, which can be disconnected/disconnected. It is designed to be switched on and off. In this case, the interlock may be a temporary one in which the speed change priority switch 1b is connected at the same time as the main switch 1a is connected, and when an electric signal is sent, it quickly returns to the disconnected side.

As shown in FIG. 3, the transmission mechanism 4 is built into a transmission path 7 that transmits the power of the engine 3 to an appropriate number of driving wheels 6, and has a large gear for forward rotation on a transmission shaft 8. 9 and a reversing sprocket 10 are loosely fitted, and a forward/reverse clutch body 11 is spline-fitted to the speed change shaft 8 so that it can only slide freely. It is configured to be slid along the rotation position U and reverse rotation position D via the neutral position N, and to be selectively engaged with and disengaged from both of the positions 9 and 10.

Therefore, when the transmission arm 12 is at the forward rotation position U, the forward/reverse clutch body 11 is engaged with the forward rotation large gear 9, and is at the neutral position N which is between the two positions U and D.
, neither will be engaged.
Further, the transmission path 7 is built in a transmission case 14 attached to the machine frame 13, and the output shaft 3a of the engine 3 is provided protruding inside the transmission case 14.
Transmission is transmitted from a to an appropriate number of drive wheels 6 through a reduction gear group 15, a transmission mechanism 4, a pair of reduction bevel gears 16, etc., and also to a chain saw 34 mounted upright on the transmission case 14. It is transmitted.

The electric shift operating device 5 connects the shift switch operating lever 17 and the shift mechanism 4 to the shift switch 18,
19, a controller 20, which operates in conjunction with a speed change drive section 21 (hereinafter referred to as servo motor 21) such as a servo motor, and this speed change switch operating lever 17
The gear change of the transmission mechanism 4 is electrically performed by operation.

That is, the speed change switch operating lever 17 is rotatably supported on the support plate 22 (second
), and a return spring 23 between this support plate 22
is interposed so that it always returns to the horizontal elastic holding position after rotational operation, and there are speed change switches 18, 19 before and after this cam portion 17a.
are arranged facing each other, and each time the shift switch operating lever 17 is rotated either up or down from the elastic holding position, the corresponding shift switches 18 and 19 are operated and input respective operating signals to the controller 20. It is configured as follows. In the embodiment, a forward rotation speed change switch 18 is provided on the right side of the hanging cam portion 17a, and a reverse rotation speed change speed switch 19 is provided on the left side.

The controller 5 transmits the operating signals of the speed change switches 18 and 19 to the corresponding clip-flop 2.
4 and 25, the arithmetic circuit 26 performs calculation adjustment, and the servo motor driver 27 drives and controls the servo motor 21 in the forward and reverse directions by a predetermined amount. When it is in position N, it sends forward rotation to forward rotation position U when it is in neutral position N, or vice versa, and this arithmetic circuit 26 is connected to the speed change priority switch 1b. . In the embodiment, this arithmetic circuit 26 is shown as consisting of gates 28 and 29 corresponding to each clip-flop 24 and 25, an up-down counter 30, and a decoder 31.

According to this, when the engine start switch 1 is turned on, not only when the transmission arm 12 is at the neutral position N, but also when it is at the forward rotation position U or the reverse rotation position D.
At the same time as the engine 3 is started, an electrical signal is input to the up-down counter 30, and the priority output of this counter 30 is decoded by the decoder 31, and the priority output of this counter 30 is decoded to select the output from forward rotation, neutral rotation, reverse rotation, and neutral rotation. The motor shaft 21a of the servo motor 21 is forcibly selected by the servo motor driver 27.
is driven in the return direction by a predetermined amount (in this case, it is not driven when the shift arm 12 is initially in the neutral position N), and the shift arm 12 is switched to the neutral position via the disc 32 and the rod 33. Become.
As a result, even if the engine 3 starts, its power is not transmitted to the drive wheels 6, ensuring safety.

Then, in order to drive the drive wheels 6 in the normal rotation,
By moving the speed change switch actuating lever 17 upward in the A direction, the forward rotation side feed speed change switch 18 is actuated, and the actuation signal is input to the controller 20, which controls the servo motor 2.
1 to drive and control the gear shift arm 12 to the neutral position N.
This is done by switching from the normal rotation position U to the normal rotation position U. That is, the actuation signal is the clip-flop 2
After the waveform is shaped in step 4, it passes through gate 28 and enters the up input of up-down counter 30, the output of this counter 30 is incremented by 1, and this output is decoded by decoder 31 to be used for forward rotation, neutral rotation, and reverse rotation. The next forward rotation is selected from those for forward rotation, the motor shaft 21a of the servo motor 21 is driven in the forward direction by a predetermined amount by the servo motor driver 27, and the speed change arm 12 is switched to the forward rotation position U.
The power from the engine 3 is transmitted through the transmission mechanism 4 located at the normal rotation position U to drive the drive wheels 6 in normal rotation. As a result, the machine body can be raised relative to the trunk of the tree, and the operating chain saw 34 can be used to switch branches on the way up. In addition, the controller 20
is configured such that a timer signal from a timer 35 having a desired pruning height setting dial 35a is inputted, and when the dial 35a reaches the setting position, a signal is sent from the timer 35 to the calculation circuit 26 to perform calculation. The motor shaft 21a of the servo motor 21 is adjusted by the servo motor driver 27.
However, the shift arm 12 is moved from the normal rotation position U to the reverse rotation position D.
Since the drive is controlled so that the drive wheels 6 can be switched all at once, this automatically switches the drive wheels 6, which are currently rotating in the forward direction, to the reverse drive, allowing the aircraft to move from the desired pruning height set in advance. will be lowered. In addition, if the engine stalls while the aircraft is descending, in order to restart the engine 3 and lower the aircraft using engine 3 power, move the speed change switch actuating lever 17 downward in the direction B and switch the speed change switch for reverse side feed. 19 is activated, the activation signal is input to the controller 20, and the controller 20 drives and controls the servo motor 21 to switch the speed change arm 12 from the neutral position N to the reverse rotation position D.

In the figure, reference numerals 36, 37, and 38 indicate shift position emergency lamps that are lit corresponding to shift positions U, N, and D of the shift arm 12, and 39 indicates a universal joint.

(g) Effects of the invention As is clear from the above explanation, according to this invention, the engine start switch 1 is installed between the power source 2 and the engine 3 and between the power source 2 and the electric speed change operation device 5. Moreover, when the engine 3 is started by connecting the engine start switch 1, an electric signal is inputted to the electric shift operation device 5, and the transmission mechanism 4 is transmitted via the shift operation device 5. However, even if the engine is in the forward rotation position U or reverse rotation position D before starting, it will be preferentially switched to the neutral position N.
This problem occurred because the engine was started without forgetting that it was on. This eliminates problems such as injury to workers due to sudden starts, wheels falling off, etc., and improves safety.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the engine safety starting device for a pruning machine according to this invention, Fig. 2 is a sectional view of its main parts, and Fig. 3 is a transmission incorporating the engine safety starting device. It is an explanatory diagram showing a route. 1...Engine start switch, 2...Power supply, 3
...Engine, 4...Transmission mechanism, 5...Electric shift operation device, D...Reverse position, N...Neutral position,
U...Normal rotation position.

Claims (1)

[Scope of utility model registration request] An engine start switch 1 that can be disconnected and disconnected between a power source 2 and an engine 3 is provided, and power from the engine 3 is transmitted to the driving wheels via a transmission mechanism 4 that can switch between a forward rotation position U, a neutral position N, and a reverse rotation position D. 6, and the pruning machine is configured such that the speed change mechanism 4 is electrically changeable via an electric speed change operation device 5, in which the engine start switch 1 and the electric speed change operation device 5 are connected; By connecting the engine start switch 1, an electric signal for preferentially switching the transmission mechanism 4 to the neutral position N is inputted to the electric speed change operation device 5 at the same time as the engine 3 is started. A safety engine starting device for pruning machines featuring: