JPH0424005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic up-and-down device based on trunk diameter detection in a pruning machine, which automatically switches from ascending to descending when the trunk diameter becomes thinner to a predetermined diameter during ascending pruning.

Conventionally, a drive wheel and an idler wheel are attached to the bow-shaped main frame and sub-frame, respectively, which hold the trunk and transmit power from the prime mover to the drive wheels via a transmission path to achieve the desired climbing distance. A timer mechanism that can be set to any distance depending on the situation activates a forward/reverse switching mechanism built into the conduction system to move it spirally up and down the trunk, and as it goes up, a chain saw is equipped to cut off the branches along the way. Cutting pruners are known.

By the way, when setting the desired climbing distance using a timer mechanism, there is the hassle of having to set the climbing distance individually for various large and small trees to be pruned, and it is also difficult to set the climbing distance incorrectly, especially if it is excessive. After climbing as far as it could go with the drive wheels, the drive wheels would slip in the same place until the set time, causing problems such as damaging the trunk.

Therefore, this invention provides a pruning machine that detects the trunk diameter with a sensor, and when it becomes thinner to a predetermined diameter, activates a solenoid device to switch the forward/reverse switching mechanism via a speed change lever mechanism to automatically switch from ascending to descending. We provide an automatic vertical movement device that detects the trunk diameter.
This solution addresses the aforementioned drawbacks.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

Figures 1 and 2 are a front view and a plan view of this pruning machine, and this pruning machine has an arc-shaped main frame 1 and a sub-frame 2, one end of which is pivotally connected with a pin 3 or the like, and the other end It is made into a circular shape by being pulled by a spring 4. Driving wheels 5... and idler wheels 6... are attached to the main frame 1 and the sub-frame 2, respectively, and the trunk 7 is supported by these.

The power of the prime mover 8 is transmitted to the driving wheels 5 in the transmission box 9, and is also transmitted from the input shaft 11 to the chain saw 10, which is provided upward so as to be in contact with the trunk 7. .

The mission box 9 is configured to be able to swing freely around a swing fulcrum P integrally with the prime mover 8, chain saw 10, etc., and this swing fulcrum P is located forward in the direction of travel from the center of gravity of the mission box 9, etc. Therefore, when ascending, the chain saw 10 is drawn toward the trunk 7 by its inertia, and the distance between the chain saw 10 and the trunk 7 is determined by the stopper 10a installed on the chain saw 10. The amount of protrusion of the branch to be cut is kept constant, and when descending, the chain saw 10 and the like are separated from the trunk 7 due to inertial force.

FIG. 3 shows a transmission structure in which power is transmitted from the prime mover 8 to the drive wheels 5... and the chain saw 10. The prime mover (shaft) 12 is connected to the centrifugal clutch 1.
3, the speed is appropriately reduced by sprockets, gears, worms, etc., and the shafts 14, 15, and 1
It is transmitted to the output shaft 18 to the drive wheels 5 . . . through a transmission line 17 such as No.

By the way, a forward/reverse switching mechanism 19 is incorporated in the shaft 16, and a gear shift lever mechanism 20 capable of switching the forward/reverse switching mechanism 19, a solenoid 31 for operating the gear shift lever mechanism 20, and a movable iron core 3 are provided.
It is attached to a solenoid device 30 consisting of two components and a mission box 9.

The forward/reverse switching mechanism 19 has two gears 21 and a sprocket 22 which are loosely fitted to the shaft 16 to which opposite rotational force is transmitted from the shaft 15, and the two gears 21 and 22 are spline-fitted with the shaft 16 and slide. The clutch 23 is fitted, and the engaging pieces 24 and 25 formed on both sides of the clutch 23 are engaged and disengaged with the corresponding engaging pieces 24' and 25' formed on the opposing side surfaces of the gear 21 and sprocket 22. By doing so, it becomes positive and opposite or neutral.

The shift lever mechanism 20 has a fork 26 linked to the clutch 23 fixed to an operating shaft 27, the operating shaft 27 protruding outside the transmission box 9, and one end of a shift lever 28 fixed to this protrusion.
When the lever 28 is operated from the forward rotation position F to the reverse rotation position B, the forward/reverse switching mechanism 19 is operated via the fork 26.

A spring 29 is interposed between the gear shift lever 28 and the transmission box 9, and the gear shift lever 28 is constantly pulled from the normal rotation position F to the reverse rotation position B. When the gear shift lever 28 is in the normal rotation position F, the solenoid 31 It is configured to engage and disengage from the tip of the movable iron core 32 that protrudes and retracts from inside. In addition, the movable iron core 32
The storage box 30a is always held by the spring 33.
The tip protrudes a certain length from the solenoid 31 when energized with the battery 41 as described later.
This allows the tip to retreat against the spring 33 and release the engagement with the speed change lever 28 that was engaged when the tip was protruded. In addition, for emergencies such as an engine stall, one end of a rope is connected to the end of the movable iron core 32, and when the machine stops mid-ascent, this rope can be lowered from the machine and released by pulling the rope. It is good to set it up.

On the other hand, a trunk diameter detection sensor 34 for detecting the diameter of the trunk 7 is mounted on a support plate 35 extending from the main frame 1 toward the trunk 7 with an upward lead angle similar to the drive wheels 5 and idle wheels 6. It is installed.

The trunk diameter detection sensor 34 has the middle part of a sensor arm 37 that is always pulled toward the trunk 7 by a spring 36 pivoted on a horizontal support stand 35, and its tip on the trunk 7 side contacts the outer skin of the trunk 7. A detector 39, such as a micro switch, is disposed to pivotally support the rolling wheel 38, which is rolling, and to issue a detection signal when the arm 37 approaches the trunk 7 side to a predetermined position. Then, the contact of the detector 39 is closed, and a detection current flows from the battery 41 to the solenoid 31, pulling the movable iron core 32 against the spring 33 and retracting it. The lock is released (see Fig. 4). Note that the detector 39 is slid and fixed as appropriate on a slide table 40, and is configured to be adjustable to change its position forward and backward relative to the sensor arm 37.

Next, to explain the operation of the present invention, the detector 39 is adjusted back and forth to set the desired minimum trunk diameter to be pruned, for example, 6 cm. Since the arms 37 are separated by a large distance, the detector 39 is opened, and as a result of this opening, the tip of the movable iron core 32 protrudes due to the biasing force of the spring 33), and the protruding tip of the movable iron core 32 is pressed temporarily. When the shift lever 28 is in the retracted state, the spring 2
9 and then return it to lock it, set the gear shift lever 28 to the normal rotation position F, and raise the machine while pruning until the diameter of the trunk 7 narrows to the predetermined set diameter. Then, the contact of the detector 39 closes, and as mentioned above, the shift lever 28, which had been locked at the forward rotation position F, is unlocked and is automatically switched to the reverse rotation position B. At the same time, the forward rotation switching clutch 23 is operated to switch the drive wheels 5 from normal rotation to reverse rotation, and the machine moves downward.

In addition, when moving without pruning work, solenoid 3
In order to prevent the battery 41 from being consumed due to energization of the sensor 1, a manual switch is provided in the circuit (not shown), or locking means is used to lock the sensor arm 37 and open the contact of the detector 39, etc. .

As described above, since the present invention has the above-described structure and functions, it is not necessary to incorporate a mechanical, electrical, etc. timer mechanism into the conduction path 17 as in the past, and the structure is simplified. Since the setting is based on the trunk diameter, not the time etc.,
The pruning diameter of all the trees to be maintained during pruning becomes constant, and setting errors are reduced.As mentioned above, the drive wheel 5... is set at the same place where the time setting was incorrect and it was impossible to climb due to the structure of the machine. It will not slip until the set time is reached, damaging the trunk and reducing the quality of the tree.

[Brief explanation of drawings]

1 and 2 are a front view and a plan view of a pruning machine according to the present invention, FIG. 3 is a partially cutaway exploded sectional view showing a conduction system in which this invention is implemented, and FIG. 4 is an operating system block. It is a diagram. Code, 5...driving wheel, 6...idling wheel, 7...trunk, 8...
Prime mover, 17... Conduction system path, 19... Forward/reverse switching mechanism,
20... Gear shift lever mechanism, 30... Solenoid device,
34...Stem diameter detection sensor.

Claims (1)

[Claims] 1. The power of the prime mover 8 is transmitted via the transmission line 17 to the driving wheels 5 among the driving wheels 5 and idle wheels 6 which are in contact with the periphery of the trunk 7, and by switching the speed change lever mechanism 20, the above-mentioned A trunk diameter detection sensor 34 that detects the diameter of the trunk 7 in a pruning machine that moves up and down the trunk 7 by activating a forward/reverse switching mechanism 19 incorporated in the conduction path 17; A solenoid device 30 is provided which is activated by a predetermined trunk diameter detection signal, and the speed change lever mechanism 20 is switched automatically or by stopping the rise and pulling the rope descending from the machine by the operation of the solenoid device 30. An automatic up-and-down device by detecting the trunk diameter of a pruning machine configured to allow