JPH0732649B2 - Pruning machine engine automatic stop mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an automatic engine stop mechanism for a pruning machine, and in particular, prevents the pruning machine from inadvertently stopping the engine while the trunk is moving up and down. It is characterized by

(B) Conventional technology Conventionally, there is a pruning machine that prunes while the trunk is rising and automatically descends when pruning to a predetermined height, but normally this type of pruning machine works. For the sake of safety, an engine automatic stop mechanism for automatically stopping the engine of the pruning machine lowered to a predetermined position is equipped.

To explain the outline of this automatic engine stop mechanism, the contact extending from the micro switch as a sensor is the ground,
Or, it is displaced by touching the attachment to the trunk, and the displacement causes the microswitch to operate and emits a sensing signal,
An appropriate engine stopping means receives this and automatically stops the engine (see, for example, Shokai Sho 60-174554).
(See the official gazette).

(C) Problems to be Solved by the Invention In the engine automatic stop mechanism of this type, since the contactor that comes into contact with the ground or an attachment to the trunk extends from the micro switch, During the ascending / descending of, the cut branch or the adjacent branch of the tree undesirably comes into contact with the contact, which causes the automatic engine stop mechanism to stop and the pruning machine stops at an unintended point, that is, in the middle of the trunk. I have something to do. If such a situation occurs, it takes a lot of time and labor to collect the pruning machine, and the efficiency of the pruning operation is significantly impaired.

In view of the above problems, the present invention provides an engine automatic stop mechanism for a pruning machine that does not inadvertently stop the engine due to a cut branch or an adjacent tree branch. .

(D) Means for Solving Problems The means adopted by the present invention for solving the above problems are
As shown in FIG. 1 corresponding to the embodiment, the trunk (4) is presumed to be a pruning machine that ascends / descends along the surface thereof by the power of the engine (2) mounted on the machine body (5). (4) A magnetic sensor (9) that senses the magnetic substance (16) on the surface, and the engine (2) is stopped in response to a sensing signal that the magnetic sensor (9) senses and emits the magnetic substance (16). And an engine stopping means for causing the engine to stop.

(E) Action Even if a cut branch or an adjacent tree branch interferes with the magnetic sensor (9) while the pruning machine is moving up and down, the interfering branch must not be magnetic. From that, the magnetic sensor (9) does not emit a sensing signal, so an accidental engine shutdown as in the past cannot occur.

When the pruning machine finishes pruning and descends, the magnetic sensor (9) senses the magnetic substance (16) attached to the lower surface of the trunk (2) in advance and emits a sensing signal to sense it. When the engine stop means receives the signal, the engine (2) is automatically stopped, and the airframe (5) stops moving.

(F) Example Hereinafter, a specific example of the present invention will be described in detail with reference to the drawings.

1 and 2 show a pruning machine according to the present invention, (1) is a drive wheel driven by the power of an engine (2), and (3)
Is an idler wheel which is arranged to face the drive wheel (1) with the trunk (4) interposed therebetween, and the engine (2) also drives a chain saw (6) which is erected upward of the body (5). Since the drive wheel (1) and the idler wheel (3) are arranged obliquely with respect to the horizontal plane, the body (5) is rotated spirally by the rotational drive of the drive wheel (1). Since the trunk (4) is moved, and the chain saw (6) also spirally moves along the surface of the trunk (4) during the movement of the body (5), the chain saw (6) is the body (5). The branches protruding from the trunk (4) will be cut off sequentially during the ascent and descent of.
(7) is an automatic raising / lowering switching mechanism. When the height setting dial (8) is set to an appropriate position, the machine body (5) is automatically raised by a distance corresponding to the set value and then automatically driven by the drive wheels (1). ) Is inverted and descends in a spiral shape.

(9) is a magnetic sensor fixed to the airframe (5), and its sensitivity is made to face the trunk (4) surface as close as possible to the surface of the trunk (4) as far as there is no hindrance. It is preferable in order to raise it. The magnetic sensor (9) cooperates with the engine stopping means to stop the engine (2). One example of the engine stopping means is the engine (2).
The case of a spark ignition type engine will be described with reference to FIG. That is, (10) is a contact which is closed in response to a sensing signal generated by the magnetic sensor (9), and serves to ground the primary coil (12) of the electric ignition device (11).
(13) is a spark plug connected to the secondary coil (14), and (15) is a power generator for supplying power to the primary coil (12), which is driven by rotation of the engine (2). Now, when the contact (10) is closed, the primary current is interrupted, the induction action of the primary coil (12) is not obtained, and the high voltage is not induced in the secondary coil (14). ) Cannot be discharged and the engine (2) is stopped.

A method of using the pruning machine having the above structure will be described. As shown in FIG. 1, a strip-shaped iron plate (16) is wound around a position below the trunk (4) and close to the ground in advance. The pruning machine is then attached to the trunk (4), in which case the magnetic sensor (9)
Position the pruning machine so that is above the strip-shaped iron plate (16). As a result, the engine (2) is prevented from being unstartable by the action of the magnetic sensor (9) and the engine stopping means, and is brought into the startable state. If the engine (2) is started from this state and the pruning machine is started, the pruning machine ascends and prunes as in the conventional case, and when pruning to a predetermined height, the automatic lifting / lowering switching mechanism (7). Is activated, and it descends while rotating spirally. Then, when the magnetic sensor (9) of the pruning machine descends until it senses the strip-shaped iron plate (16), the engine (2) automatically stops.

If, in addition to the strip-shaped iron plate (16), the elongated magnetic body (17) is added vertically as shown by the phantom line in FIG. 1, the magnetic sensor (9) will temporarily move at the time of the first spiral rotation. Even if the elongated magnetic body (17) is not sensed, it can be sensed at the time of the next spiral rotation or at the time of the next spiral rotation, and the engine (2) can be more surely automatically stopped.

(F) Effects of the Invention As described above, according to the present invention, the magnetic sensor (9) is provided in place of the conventional micro switch or contactor, so that a branch or the like interferes with the magnetic sensor (9). However, unlike the conventional case, the problem of accidental engine stoppage does not occur, and therefore, there is an effect that the efficiency of pruning work is improved without the conventional airframe recovery work.

[Brief description of drawings]

FIG. 1 is a front view showing a pruning machine according to the present invention, FIG. 2 is a plan view of an essential part of the same, and FIG. 3 is a circuit explanatory view showing an engine stopping means. 2 ... Engine, 4 ... Trunk 5 ... Airframe, 9 ... Magnetic sensor 16 ... Magnetic material

Claims (2)

[Claims] 1. In a pruning machine, wherein a trunk (4) is raised and lowered along the surface of the trunk (4) by the power of an engine (2) mounted on the fuselage (5), a magnetic material ( 16)
A magnetic sensor (9) for detecting the engine and an engine stopping means for stopping the engine (2) in response to a detection signal generated by the magnetic sensor (9) detecting the magnetic body (16). An automatic engine stop mechanism for the pruning machine. 2. The primary coil of an electric ignition device (11) in a spark ignition type engine (11), wherein the engine (2) is a spark ignition type engine, and the engine stopping means receives a detection signal of a magnetic sensor (9). The automatic engine stop mechanism of the pruning machine according to claim 1, characterized in that 12) is grounded and short-circuited.