JPH0695858B2 - Slipper compatible structure of pruning machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a slip coping structure of a pruning machine that can effectively cope with a slip of a drive wheel.

(B) Prior art Conventionally, as a pruning machine capable of preventing the slip of the drive wheels, a torque is provided in the power transmission path to the drive wheels among an appropriate number of the drive wheels and the idler wheels arranged so as to be capable of being pressure-welded around the trunk of the tree. There are a restricting device arranged so that the restricting device slips when the torque exceeds a set torque, and a chain saw mounted vertically on a chain saw is provided with a branch preventing device.
The latter is designed so that the chain saw can pass through the lower part of the branch that reaches the tip of the chain saw where it is easy to bite, and the chain saw can branch and the climbing of the machine body is prevented, and the drive wheels It prevents slipping.

(C) Problems to be solved by the invention However, in the former method using the torque limiting device,
It may not be possible to deal with a large trunk diameter change of a single-diameter tree, or it may not be able to cope with bending and different-diameter trees, and the latter method of preventing branching can only support branching of the chain saw, and to accommodate all However, it is necessary to provide both devices, which is complicated and uneconomical, and there is a problem that it is not possible to sufficiently deal with derailing.

(D) Means for Solving the Problem Therefore, the present invention has an appropriate number of drive and idle wheels arranged so as to be capable of being pressed against the circumference of a tree trunk, and has a positive power transmission path to the drive wheels. In the pruning machine, which is provided with a speed change mechanism capable of speed change between a rotating position, a neutral position, and a reverse position, drives the drive wheels in the forward and reverse directions by the power of the engine, and automatically raises and lowers the body with respect to the trunk, A drive wheel detection sensor for detecting the rotation speed of the drive wheel, and an idle wheel detection sensor for detecting the rotation speed of the idle wheel are provided.
The detection signals from both detection sensors are compared, and when the comparison value is out of a certain setting range, the speed change mechanism switches between normal rotation position (U), neutral position (N) and reverse rotation position (D). An object of the present invention is to provide a slip countermeasure structure for a pruning machine, which is characterized in that a control device is provided.

(E) Operation With the above configuration, when the drive wheel slips and this rotation speed changes outside the set range with respect to the rotation speed of the idler wheel, the gear shift control device switches the gear shift. Therefore, it will be possible to cope with the slip of the driving wheel.

(F) Embodiment Hereinafter, a preferred embodiment of the present invention will be illustratively described in detail with reference to the drawings.

First, the schematic configuration of the pruning machine will be described with reference to FIGS.
As shown in the figure, the engine (1), the AC generator (2),
A main frame (7) including a transmission case (5) in which a chain saw (3) and an appropriate number of drive wheels (4) are arranged, and idle wheels (6) and the like.
Side, and an appropriate number of idler wheels (6) and the like are arranged on the winding frame (8) side, and the winding frame (8) is rotated around the pivot pin (9) with respect to the main frame (7). One frame can be opened and closed, and both frames (7)
(8) is configured to be elastically biased toward the closing side by a detachable engagement / disengagement spring (10), and the drive wheel (4) and the idler wheel (6) are provided with a predetermined rising lead angle. Spring removal (10)
Is pressed against the circumference of the tree trunk (11).

The power of the engine (1) is transmitted from the output shaft (1a) protruding in the transmission case (5) to the reduction gear group (12) and the transmission mechanism (1).
3), each pair of deceleration bevel gears (14) ... is transmitted to the drive wheels (4) via a power transmission path (15), and also to the AC generator (2) and chain saw (3) It is transmitted via the shaft (1a). In addition, speed change mechanism (13)
Is loosely fitted on the speed-change shaft (18) with the normal rotation large-speed gear (16) and the idle sprocket (17) which are power-transmitted through the speed-reduction gear group (12). A forward / reverse clutch body (19), which is spline-fitted only for movement, is mounted along a speed-change shaft (18) via a speed-change arm (20) that is rotatably supported. D) is slidably moved to and from the neutral position (N) to selectively engage and disengage from both (16) and (17). Therefore, when the speed change arm (20) is in the forward rotation position (U), the forward / reverse clutch body (19) is engaged with the forward rotation large gear (16) (solid line in FIG. 2), whereby the drive shaft ( 4) is forwardly driven to spirally ascend the body with respect to the trunk (11), and is engaged with the reverse sprocket (17) when in the reverse position (D), whereby it is reversely driven and spirally descended, Both positions (U) (D)
When it is in the neutral position (N) which is the middle of the above, the power is cut off without being engaged with any of them.

By the way, as shown in FIG. 1 and FIG. 2, the slipping support structure of the pruning machine detects the rotational speeds of the drive wheel (4) and the idle wheel (6) for the drive wheel and the idle wheel detection sensor (21). (22), the detection signals from both detection sensors (21) and (22) are input to the speed change control device (23) for comparison, and if the measured value is out of the set range in consideration of measurement errors, etc. The shift mechanism (13) is configured to switch gears to a rotation position (U), a neutral position (N), and a reverse rotation position (D).

The drive wheel detection sensor (21) is an appropriate detection sensor that can detect the number of rotations of the drive wheel (4), and may be directly detected from one drive wheel (4) or the engine (1). Since it is proportional to the number of rotations, even if it is detected from the proper position in the power transmission path (15) to the drive wheel (4),
Further, the AC power generated by the AC generator (2) may be used as in the embodiment.

As the idle wheel detection sensor (22), an appropriate detection sensor that can detect the number of rotations of the idle wheel (6) is used similarly to the drive wheel detection sensor (21), and it is directly detected from the predetermined idle wheel (6). It has become.

The shift control device (23) uses a detection signal from both detection sensors (21) and (22) in a comparison circuit (25) in a controller (24).
To the same level and make comparison, and output when the comparison value by this ratio etc. is out of a certain setting range, and input this output to the arithmetic circuit (26) as priority output to adjust the operation for normal rotation and neutral. For neutral and reverse rotation, preferentially select neutral output, and output this neutral output by servo motor driver (27)
Input to this servo motor driver (27)
The motor shaft (28a) of the servomotor (28) is driven in the returning direction by a predetermined amount, and the speed change arm (20) is switched to the neutral position (N) via the disc (29) and the rod (30). Accordingly, the transmission mechanism (13) is switched to the neutral position (N). The above shows that the calculation circuit (26) has been given priority to select the neutral mode so that it can respond to troubles while the aircraft is climbing. It is possible to preferentially select the reverse selection for the reverse selection that has been selected until the input, for example, the forward selection. Also,
This shift control device (23) normally operates the comparison circuit (2
5), arithmetic circuit (26), servo motor driver (27)
In the waveform shaping circuit (31) provided in the controller (24), the gear shift switch operating lever (33) standing by the return spring (32) at a predetermined position is directed in the (A) or (B) direction. This cam part (33
a) actuates (ON) the forward rotation side feed shift switch (34) or the reverse rotation side feed shift switch (35) on the corresponding side, and the operation signal is input, and the waveform The operating signal input to the shaping circuit (31) is waveform-shaped, is arithmetically adjusted by the arithmetic circuit (26), and is selected from one of forward rotation, neutral rotation, and reverse rotation, and the sabot motor driver (27). To the motor shaft (28) of the servo motor (28) by this servo motor driver (27).
a) is driven in the forward and reverse directions by a predetermined amount, and the speed change arm (20) is moved through the disc (29) and the rod (30) to the forward rotation position (U), the neutral position (N), and the reverse rotation position (D). Any one of them can be switched in a predetermined order. That is, in order to switch the speed change arm (20) in the reverse rotation position (D) to the neutral position (N), the speed change switch operating lever (33) is operated in the (A) direction for the first time to feed the forward rotation side feed. Gear switch (3
When 4) is activated, it can be switched via the controller (24) and servo motor (28), and in order to switch from the neutral position (N) to the forward rotation position (U), the second operation is performed in the (A) direction. To change from the forward rotation position (U) to the neutral position (N), conversely, operate the speed change switch actuating lever (33) in the (B) direction to turn the reverse rotation side speed change switch (35). It is good to operate, and to switch from the neutral position (N) to the reverse rotation position (D), press (B) again.
It can be switched by operating in the direction.
Further, the controller (24) is configured to receive a timer signal from a timer (36) having a desired pruning height setting dial (36a).
a) When the set position is reached, a signal is sent from the timer (36) to the arithmetic circuit (26) for arithmetic adjustment, and the servo motor driver (27) causes the motor shaft (28a) of the servo motor (28) to move to the speed change arm. (20) is configured to be driven and controlled so that it can be switched from the forward rotation position (U) to the reverse rotation position (D) at a stroke, so that the drive wheel (4) being driven in the forward rotation is driven in the reverse rotation. It will be automatically switched to, and the rising aircraft can be lowered with respect to the trunk (11). In this case, the timer (36) may be a time-based timer, or a distance measurement timer that counts the number of rotations of the idler wheel (6) by the detection signal of the idler wheel detection sensor (22). Although illustration is omitted,
The engine (1) may be stopped directly by the timer signal from the timer (36) or via the controller (24).

In the figure, (37) is a support plate mounted in the transmission case (5), and (38) is a universal joint.

According to the above, normally, the idle wheel (6) also rotates at the same rotation speed as the rotation speed of the drive wheel (4) that is driven in the forward and reverse directions by the power of the engine (1), and the airframe moves against the trunk (11) of the tree. Is spirally moved up and down, the branches on the way up are cut by a chain saw (3), and pruning work is performed.

However, when the trunk diameter becomes smaller and the pressure contact force becomes weaker during the ascent of the airframe, and the drive wheels (4) start to stop, the rotational speed of the drive wheels (4) becomes smaller than the rotational speed of the idler wheels (6) due to the slip. When the chain saw (2) bites into a branch being cut or the drive wheel (4) hits a bulge on the trunk surface, the drive wheel (4) slips and the idle wheel (6) rotates. When a trouble such as a number larger than the number occurs, only the detected rotation speed of the drive wheel detection sensor (21) changes from that point. And this and the idle wheel detection sensor (2
When the comparison circuit (25) receiving the detection signal from 2) judges that the comparison numerical value by the ratio or the like is out of the set range, it is output to the arithmetic circuit (26). The arithmetic circuit (26) calculates and adjusts this output as a priority output, and outputs it until then (output for forward rotation or reverse rotation).
An output opposite to that for, for example, a forward rotation output is sent to the servo motor driver (27), and this servo motor driver (27) drives the speed change arm (20) via the servo motor (28). The normal rotation position (U) is returned to the reverse rotation position (D), and the drive wheel (4) is reversely driven to avoid troubles such as slip of the drive wheel (4).

(G) Effect of the Invention As described above, according to the present invention, the rotational speeds of the drive wheel (4) and the idle wheel (6) are detected for each of the drive wheel and the idle wheel while the machine body is moving up and down with respect to the trunk (11). The sensors (21) (22) detect it, the shift control device (23) compares each detection signal, and if the comparison value goes out of a certain setting range, the speed change mechanism (13) is switched. From the stem diameter, the pressure contact force of the drive wheel (4) to the surface of the trunk becomes weak and the drive wheel (4) slips, or the drive wheel (4) moving upward or downward is bent. ) Or the bulging part of the surface of the trunk (11) and the progress is obstructed to slip, or the chain saw (3) is blocked and slips due to the obstruction of the progress of all drive wheels (4). In response to slip trouble, the gear shift control device (23) sets the forward rotation position (U) and neutral. The transmission mechanism (13) is automatically switched to the position (N) and the reverse position (D), and the rotation of the drive wheel (4) is switched in the opposite direction so that it is possible to cope with it. Get better. Further, as a result of this measure, the machine can be easily evacuated from this trouble spot, so that it is not necessary to take off the wheel as in the conventional case.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of a slip coping structure of a pruning machine according to the present invention, and FIG. 2 is an explanatory view showing a power transmission path incorporating the slip coping structure, FIG. 3 is a plan view of the same pruning machine. (Code) (1) …… Engine, (4) …… Drive wheel, (6) …… Idle wheel, (11) …… Stem, (13) …… Transmission mechanism, (15) ……
Power transmission path, (21) …… Driving wheel detection sensor, (2
2) …… Idling wheel detection sensor, (23) …… Shift control device, (U) …… Normal rotation position, (N) …… Neutral position, (D)
...... Reverse rotation position

Claims (1)

[Claims] 1. A power transmission path (15) for a drive wheel (4), comprising a proper number of drive wheels (4) and idle wheels (6) arranged around the trunk of the tree (11) so as to be capable of pressure contact. ), A gearshift mechanism (13) capable of switching gearshifts to a forward rotation position (U), a neutral position (N), and a reverse rotation position (D) is provided, and the drive wheel (4) is positively moved by the power of the engine (1). In a pruning machine configured to be capable of automatically moving up and down with respect to the trunk (11) by reverse driving,
A drive wheel detection sensor (21) for detecting the rotation speed of the drive wheel (4) and an idle wheel detection sensor (22) for detecting the rotation speed of the idle wheel (6) are provided, and both detection sensors are provided. (21) Compare the detection signals from (22), and if this comparison value is outside a certain setting range, the speed change mechanism (13)
A slipping-compatible structure for a pruning machine, characterized in that a shift control device (23) for switching a shift between a forward rotation position (U), a neutral position (N) and a reverse rotation position (D) is provided.