JPH0432045Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention uses engine power to drive the drive wheels against the trunk of a tree such as cedar or cypress, and lifts the machine while moving a chain saw against the trunk. This device is effectively used in a pruning machine that spirally raises a branch to cut a branch on the way up, and relates to an automatic lifting device for the pruning machine.

(b) Prior art Conventionally, a transmission case has been provided in which an engine, a drive wheel, and a chain saw are arranged, and the power of the engine is transmitted to the drive wheels via a transmission path for the drive wheels in the transmission case. There is a pruning machine that raises the machine body relative to the trunk, and also transmits power to the chain saw via a transmission path for the chain saw, causing the chain saw to spiral upward relative to the trunk while cutting branches.

In this type of pruning machine, the transmission path for the driving wheels is branched from the middle and the speed is appropriately decelerated so that the climbing distance is determined from the travel distance related to the rotational speed of the driving wheels.In other words, the climbing distance can be measured indirectly. let it be done,
This is linked to a setting pin that allows a desired ascent distance to be set in advance with the desired ascent distance setting dial, and when the aircraft rises relative to the trunk to the set ascent distance set with the setting pin, this setting pin is automatically activated. The gear shift fork is operated via a member that comes into contact with this setting pin, and the forward/reverse clutch incorporated in the transmission path for the drive wheels is switched and operated, switching the drive wheels from forward rotation to reverse rotation and automatically raising and lowering the aircraft. A configuration was adopted that allowed this to be carried out.

(c) Problems to be solved by the invention Therefore, according to the automatic lifting device of this type of pruning machine, if the drive wheel slips on the surface of the trunk when the machine is raised relative to the trunk, This caused problems such as making it impossible to perform pruning work up to the set lifting distance because of incorrect measurements.

(d) Means for solving the problem Therefore, the present invention solves the above problem by implementing the following means.

That is, it has a transmission case in which an engine, a drive wheel, and a chain saw are arranged, and the power of the engine is transmitted to the drive wheel via a drive wheel transmission path in the transmission case, and is transmitted to the tree trunk. In the pruning machine, the drive wheel is configured to cause the machine body to rise, and at the same time, power is transmitted to the chain saw via a chain saw transmission path to cause the chain saw to spirally rise relative to the trunk while cutting branches. While incorporating an electromagnetic clutch that can connect and disconnect the transmitted power in the middle of the power transmission path, it is also possible to set the desired climbing distance and directly measure the climbing distance.
an automatic setting climbing distance attainment determination device that reversely receives an output signal when the measured climbing distance reaches the set climbing distance, and an engine stop switch that stops the engine and disconnects the electromagnetic clutch based on this output signal. A controller was placed in the appropriate position on the fuselage to control the clutch disconnection switch.

(E) Effect With the above configuration, the automatic setting distance attainment determination device can simultaneously set the climbing distance and directly measure it, so that the engine power can be used to reach the set climbing distance via the electromagnetic clutch. The transmission drive wheels are used to raise the aircraft relative to the main trunk while measuring the climbing distance, and when the set climbing distance and the measured climbing distance match, an output signal sent from this discrimination device triggers the controller's engine stop switch. The clutch disengagement switch is also switched to stop the engine and disengage the electromagnetic clutch, allowing the drive wheels to rotate freely and allowing the aircraft to descend and ascend or descend from this position using its own weight.

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

As shown in FIG. 1, the automatic lifting device A of the pruning machine includes an engine-driven lifting device 1, an automatically set lifting distance reaching determination device 2, a controller 3, and the like.

The engine drive lifting device 1 has its output shaft 4a plunged into a transmission case 5 in which an engine 4 is fixed, and transmits the engine power from the output shaft to a drive wheel transmission path 6 composed of a group of reduction gears and an electromagnetic The power is transmitted to an appropriate number of drive wheels 8 via a clutch 7, and passes through a chain saw transmission path 9 that guides the power to the appropriate position with almost no deceleration, and then to a chain saw 10 mounted upwardly inside the upper part of the transmission case 5. It is also transmitted. In this case, the driving wheels 8 have a predetermined ascending lead angle so that the aircraft can spirally ascend relative to the tree trunk 11.
It is attached to a protrusion of an axle 8a mounted together with an electromagnetic clutch 7 inside the transmission case 5. In addition,
The electromagnetic clutch 7 may be of a well-known type that connects and disconnects the transmitted power by utilizing the electromagnetic force generated by the flow of an electric signal to a built-in solenoid (not shown). When this happens, the power of the engine 4 is no longer transmitted to each drive wheel 8, and all drive wheels 8 become free rotation.

The automatic setting ascending distance attainment determination device 2 converts the light beam of the object to be measured (ground) 12 into a distance measuring optical path 16 formed by a fixed mirror 13, a prism 14, and an optical system 15, a movable mirror 17, the prism 14,
After being guided to photoelectric elements 20 and 21 through a distance measuring optical path 19 formed by an optical system 18, the output signals of these photoelectric elements 20 and 21 are sent to a comparison circuit 22.
By comparing the above, the distance of the aircraft spirally ascending relative to the trunk 11 relative to the ground 12 is sequentially and directly measured.
3, the desired ascending distance position from the ground is set in advance, and the discrimination circuit 2 compares the output signal from the comparator circuit 22 and the output signal from the ascending distance position setting means 23.
4, it is determined whether or not the aircraft has reached the set climbing distance from the ground 12. The movable mirror 17 is controlled to rotate at a constant rotation angle around a shaft 26 as a fulcrum by a motor 25 in a motor circuit (not shown). The height position of the base of the trunk 11 can be sequentially controlled between the height position of the trunk tip at the maximum height. The photoelectric elements 20 and 21 are composed of CDS, photodiodes, etc., and are used to compare the amount of light from the movable mirror 17 and the amount of light from the fixed mirror 13.

Note that as a means for successively directly measuring the distance of the aircraft to the ground 12, a means for directly measuring the ascending distance using ultrasonic waves or the like may be used, and in this case, the output signal from the means may also be used. and the output signal from the ascending distance position setting means 23 are compared and determined by the discrimination circuit 24.

The controller 3 includes a receiving section 27 and a solenoid 2.
8, a clutch disconnection switch 29, an engine stop switch 30, etc., which outputs an output signal from the discrimination circuit 24 when the measured climbing distance reaches the set climbing distance as a result of the discrimination by the discrimination circuit 24. An electric signal is received by the transfer section 27 and sent from the transfer section to the solenoid 28 for a certain period of time, thereby controlling the clutch disconnection switch 29 in the opening direction and the engine stop switch 30 in the closing direction. As a result, the electromagnetic clutch 7, which is connected to both terminals of the clutch disconnection switch 29 via the power source 31, is disconnected.
At the same time, the primary coil 4a of the engine 4, which is connected to one terminal of the engine stop switch 30,
Since it is connected to the ground 32 connected to the other terminal and grounded, the engine 4 is stopped. In addition, the clutch disconnection switch 29
The engine stop switch 30 is always biased from open to closed direction A by a spring (not shown), and the engine stop switch 30 is always biased from closed to open direction B by a spring (not shown). A manual switch 33 that can be opened and closed by switching a manual switch lever 33a is provided at a suitable position in the closed circuit on the disconnecting switch 29 side, and the electromagnetic clutch 7 can be connected and disconnected as desired by this opening and closing operation.

2 and 3 show a pruning machine equipped with this automatic lifting device A, and this pruning machine includes the mission case 5, the automatically set ascending distance reaching determination device 2, and the controller 3. etc., and a winding frame 36 which has a predetermined upward lead angle like the drive wheel 8 and rotatably supports the idler wheel 35, can be freely opened on one side using a connecting pin 37. The frames 34 and 35 can be elastically approached by a detachable wrapping spring 38, and when the frames 34 and 35 are elastically approached, the driving wheel 8 and the idler wheel 35 move around the trunk 11.
It is configured to be elastically abutted and held between the two. The discriminating device 2 is installed at a suitable location on the machine body, for example, at a position outside the upper part of the main frame 34 (on the opposite side from the trunk 11), so that the branches cut by the chain saw 10 do not come into contact with it and do not interfere with the measurement. It is installed in a place where there is no part of the fuselage directly below it.

In the figure, 39 is a guide plate that guides the branches cut by the chain saw 10 to the outside of the machine, and 40 and 41 are storage cases.

According to the above, after this machine is attached to the base of the trunk 11, the ascent distance setting dial 23a is turned as appropriate, the desired ascent distance position from the ground 12 is set in advance by the ascent distance position setting means 23, and the engine 4 is started. The engine power is transmitted from the chain saw transmission path 9 to the chain saw 10, and by switching the manual switch lever 33a in the closing direction and connecting the electromagnetic clutch 7, the drive wheel transmission path 6 and the electromagnetic clutch 7 are transmitted. The power is then transmitted to each drive wheel 8, so that the machine body spirally ascends relative to the trunk 11, and at the same time, the chainsaw 10 cuts the branches on the way up.
It is done in During this spiral upward movement, the fixed mirror 13, movable mirror 17, comparator circuit 22, etc. sequentially measure the ascending distance of the aircraft relative to the ground, and at the same time, an output signal from the comparator circuit 22 is sent to the discrimination circuit 2.
4, and when this output signal matches the output signal sent from the ascending distance position setting means 23, that is, when the ascending distance setting position is reached, an output signal is sent from the discrimination circuit 24 to the relay section 27. . Then, from this connection part, the solenoid 28
An electrical signal is sent to clutch disconnection switch 2.
9 is opened, and the engine stop switch 30 is automatically controlled in the closed direction, whereby the electromagnetic clutch 7
Since the engine 4 is cut off and the engine 4 is stopped, all drive wheels 8 are allowed to rotate freely, and the operation of the chain saw 10 is also stopped. This causes the aircraft to descend from this point under its own weight.

(g) Effects of the invention The present invention, which has the above configuration, incorporates an electromagnetic clutch 7 that can connect and disconnect the transmitted power in the middle of the driving wheel transmission path 6 that transmits the power of the engine 4 to the driving wheels 8, and also An automatic set ascent distance attainment determination device 2 that is capable of distance setting and direct ascent distance measurement, and that transmits an output signal when the measured ascent distance reaches the set ascent distance;
Since the controller 3 that controls the engine stop switch 30 that stops the engine 4 and the clutch disconnect switch 29 that disconnects the electromagnetic clutch 7 is disposed at a suitable location on the aircraft, first, the trunk 11 is Since the height of the aircraft from the ground 12 on which it is ascending can be directly measured sequentially, it is possible to directly measure the height of the aircraft from the ground 12 on which it is rising.Compared to the conventional indirect measurement method in which the climbing distance is determined from the ratio to the rotation speed of the drive wheels 8, it is possible to directly measure the height of the aircraft from the ground 12. Since it is unaffected, it is possible to measure the distance climbed more accurately. This eliminates the need for the aircraft to start descending before reaching the set ascent distance, which was the case in the past, which eliminates the need to perform pruning work again, and improves work efficiency without wasting work. can be achieved. Next, when the aircraft climbs, when the measured climbing distance reaches the set climbing distance, the engine stop switch 30 and clutch disconnection switch 29 of the controller 3 are automatically switched in response to the output signal from the discriminator 2. Since the engine 4 is stopped and the electromagnetic clutch 7 is disconnected, the drive wheels 8 are free to rotate, and the aircraft can descend relative to the trunk 11 with its own weight, which is more energy-saving than conventional systems. Since the operation of the chain saw 10 also stops in conjunction with this, safety during handling after descending can also be improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an automatic lifting device in a pruning machine according to the present invention, and FIGS. 2 and 3 are a side view and a plan view of the pruning machine incorporating the automatic lifting device. Code, 2...Automatic setting ascent distance attainment determination device,
3... Controller, 4... Engine, 5... Mission case, 6... Drive wheel transmission path, 7...
...Electromagnetic clutch, 8... Drive wheel, 9... Transmission path for chain saw, 10... Chain saw, 11...
Trunk, 29...Clutch disconnection switch, 30...
Engine stop switch.

Claims (1)

[Scope of utility model registration request] It has a transmission case 5 in which an engine 4, a driving wheel 8, and a chain saw 10 are arranged, and the power of the engine 4 is transmitted to the driving wheel 8 via a driving wheel transmission path 6 in the transmission case 5. , while causing the aircraft to ascend against the tree trunk 11,
The chain saw 1 passes through the chain saw transmission path 9.
0, and the chain saw 10 is also transmitted to the trunk 11.
In this pruning machine configured to cut branches while spirally ascending, an electromagnetic clutch 7 capable of connecting and disconnecting the transmitted power is incorporated in the drive wheel transmission path 6, and a desired lifting distance can be set and directly controlled. an automatic setting climbing distance attainment determining device 2 which is capable of measuring a climbing distance and which reversely receives an output signal when the measured climbing distance reaches a set climbing distance; and an engine which causes the engine 4 to be stopped based on this output signal. Stop switch 30 and the electromagnetic clutch 7
clutch disconnection switch 29 for disconnecting
An automatic lifting device for a pruning machine, characterized in that a controller 3 for controlling the above is disposed at an appropriate position on the machine body.