JPH0455481Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention consists of a transmission mechanism capable of changing gears from a neutral position to a forward rotation position and a reverse rotation position, which is electrically interlocked with a transmission switch operating lever. The present invention relates to a speed change operation device for a pruning machine that performs speed change operation.

(b) Prior art The speed change operation device of a conventional pruning machine has a fulcrum-crossing spring interposed between the speed change lever, which is pivoted so as to be vertically movable from an intermediate horizontal position to a predetermined vertical position, and an appropriate position on the machine. At the same time, the fulcrum crossing spring is configured so that it can cross the pivot point (fulcrum) of the speed change lever while the speed change lever is operated up and down, and the transmission path that transmits the power of the speed change lever and the engine to the driving wheels is connected. The transmission lever is mechanically interlocked with the transmission fork of the transmission mechanism built into the upper position (forward rotation position),
In response to the operation in the intermediate position (neutral position) and down position (reverse position), the gear shift hawk switches to the forward rotation position, neutral position, and reverse rotation position, and the drive wheel is shifted between forward rotation drive, free rotation, and reverse rotation drive. It was something that made it possible. According to this structure, the gear shift lever cannot be held in an intermediate neutral position, so a stopper is provided on the shift lever side that can advance against the spring, and when starting the engine, the stopper is advanced and the shift lever is moved The engine is held in the neutral position, then the engine is started, and when the aircraft is raised against the trunk of a tree, the stopper is automatically retracted by the spring at the same time as the gear lever is moved up to switch to the forward rotation position. It is becoming more and more common.

(c) Problems to be solved by the invention Therefore, in this type of speed change operation device,
If the machine stalls due to an engine stall while the drive wheels are being driven in the forward or reverse direction and the machine is moving up or down against a tree trunk, the shift lever will remain in the forward or reverse position due to the force of the spring that crosses the fulcrum. Therefore, in order to recover the aircraft from this stopping point, switch the gear lever position to the neutral position,
It would be possible to allow the drive wheels to rotate freely, but it is difficult to advance the stopper from the ground using an operating rod and at the same time have the stopper hold the gear shift lever and switch it to the neutral position. There were problems such as having to spend a lot of time and effort climbing trees to recover the aircraft.

(d) Means for solving the problem Therefore, this invention provides a transmission mechanism 2 that can change gears from a neutral position N to a forward rotation position U and a reverse rotation position D.
, the power of the engine 7 is applied to an appropriate number of drive wheels 8, 8...
This is a speed change operating device for a pruning machine, which is incorporated into a transmission path 9 that transmits power to a pruning machine and operates the speed change mechanism 2 in conjunction with a speed change switch actuation lever 1, and the speed change operation device operates the speed change mechanism 2 in conjunction with a speed change switch actuation lever 1.
3 so that it can be rotated back to the elastic holding position, and the shift switches 3 and 4 are arranged within the rotation operation range from this elastic holding position, and the shift switch operating lever 1 can be rotated from the elastic holding position. Each time, the corresponding speed change switches 3 and 4 are operated, and the speed change of the speed change mechanism 2 is changed from the normal rotation position U to the neutral position N and then back to the neutral position N via the controller 5 and the speed change drive unit 6. to the reverse position D, and from the reverse position D to the neutral position N.
Then, the neutral position N is converted to the normal rotation position U.

(E) Effect With the above configuration, once the shift switch actuating lever is rotated and the shift switch is operated, even if it returns to the elastic holding position, the shift mechanism is not activated via the controller and the shift drive unit. Therefore, the shift switch actuating lever can be easily rotated to change the gears of the transmission mechanism.

(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 speed change operating device in the pruning machine connects a speed change switch operating lever 1 and a speed change mechanism 2 to speed change switches 3, 4, a controller 5, and a speed change drive unit 6 such as a servo motor (hereinafter referred to as a servo motor). The transmission mechanism 2 is operated in conjunction with a motor 6 (referred to as a motor 6), and the gear change of the transmission mechanism 2 is performed by operating the gear shift switch actuating lever 1. The transmission mechanism 2, as shown in FIG.
and a reversing sprocket 12, and a forward/reverse clutch body 13 which is spline-fitted to the transmission shaft 10 so that it can only slide freely is moved along the transmission shaft 10 via a transmission arm 14 which is rotatably supported. Normal rotation position U
and a reverse position D via a neutral position N, and are configured to selectively engage and disengage from both 11 and 12. Therefore, when the transmission arm 14 is in the forward rotation position U, the forward/reverse clutch body 13 is engaged with the large gear 11 for forward rotation (solid line in FIG. 3), and when it is in the reverse rotation position D, it is engaged with the sprocket 12 for reverse rotation. When it is at the neutral position N, which is between the two positions U and D, it is not engaged with either of them. Also,
The transmission path 9 is built into a transmission case 16 attached to the machine frame 15, and has an output shaft 7a of the engine 7 protruding into the transmission case 16, and connects the output shaft 7a to a reduction gear group 17, a transmission mechanism 2, and a pair of The power is transmitted to an appropriate number of drive wheels 8 through respective reduction bevel gears 18, etc.

The gear shift switch operating lever 1 is connected to the transmission case 16
A horizontal shaft 20 is rotatably supported on a support plate 19 which is fixed in an upright position at a proper position, and a gear shift switch actuating cam 21 is fixed to one end of the horizontal shaft 20, and an operating lever 22 is fixed to the other end. (See FIG. 2), a return spring 23 is interposed between the support plate 19 and the speed change switch cam 21, so that the operating lever 22 is always rotated back to the horizontal elastic holding position.

The transmission switches 3 and 4 are operated (ON) on the forward rotation side to send the transmission mechanism 2, which is capable of changing gears from the neutral position N to the forward rotation position U and the reverse rotation position D, to the forward rotation position U side on one side. There are two types: one for feeding, and one for reverse side feeding, which is used to feed the other side by operation.
The shift switch actuating lever 1 is arranged to face each other within a predetermined operating range of rotation in the vertical direction from the elastic holding position. The side shift switches 3 and 4 are configured to be operated.

In the embodiment, a drooping gear shift switch operating cam 2 is used.
1, a speed change switch 3 for forward rotation is disposed on the right side of the rotor 1, and a speed change switch 4 for forward rotation on the left side is disposed. It should be noted that micro switches or the like are employed as the speed change switches 3 and 4.

The controller 5 uses the corresponding clip-flops 24 and 25 to shape the waveforms of the respective actuation signals issued when the speed change switches 3 and 4 are actuated, causes the arithmetic circuit 26 to make calculation adjustments, and causes the servo motor driver 27 to drive the servo motor 6 by a predetermined amount. It controls the drive. In the embodiment, this arithmetic circuit 26
, the gates 28 and 29 corresponding to each clip-flop 24 and 25, and the up-down counter 3
0 and a decoder 31 are shown. According to this, for example, when the shift arm 14 is in the normal rotation position U, the shift switch operating lever 1
When the reverse side feed speed change switch 4 is operated for the first time by turning the switch in direction B, the waveform is shaped by the clip flop 25, passes through the gate 29, enters the down input of the up/down counter 30, and this The output of the counter 30 is subtracted by 1, and this output is decoded by the decoder 31,
The next neutral type is selected from the forward rotation, neutral, and reverse rotation, and the motor shaft 6a of the servo motor 6 is driven in one direction by a predetermined amount by the servo motor driver 27, and the speed is changed via the disc 32 and the rod 33. When the arm 14 is switched to the neutral position N and operated for the second time, the motor shaft 6a is similarly driven further in the same direction by a predetermined amount, and the speed change arm 14 is switched to the reverse rotation position D. Conversely, when the shift arm 14 is in the reverse rotation position D, the shift switch operating lever 1
When the forward rotation feed speed change switch 3 is operated for the first time by rotating it in the direction of The output of counter 30 is incremented by 1,
This output is decoded by the decoder 31, and the next neutral is selected from among the forward, neutral, and reverse rotations, and the servo motor driver 27 returns the motor shaft 6a of the servo motor 6 in the reverse direction by a predetermined amount. , when the shift arm 14 is switched to the neutral position N and operated for the second time, the shift arm 1
4 is switched to normal rotation position U. Note that when the output of the decoder 31 is for forward rotation, the gate 28 in front of the count-up input is closed.
Even if the shift switch operating lever 1 is rotated in the A direction to operate the forward rotation side feed shift switch 3,
The up-down counter 30 does not change. Conversely, when the output of the decoder 31 is for reverse rotation, the same configuration is used.

The controller 5 is also configured to receive a timer signal from a timer 34 having a desired pruning height setting dial 34a, and when the dial 34a reaches the setting position, a signal is sent from the timer 34 to the arithmetic circuit 26. sent and calculated and adjusted,
The servo motor 6 is driven and controlled by a servo motor driver 27. In this case, the motor shaft 6a of the servo motor 6 is driven so that the speed change arm 14 can be switched from the normal rotation position U to the reverse rotation position D at once. As a result, the drive wheels 8, which were being driven in the normal direction, are switched to being driven in the reverse direction.

Furthermore, the controller 5 includes a speed change arm 14.
Shift position display lamps 35, 36, and 37, which are lit in correspondence with shift positions U, N, and D, are connected. This allows the operator to properly operate the gear shift switch actuating lever 1 without making a mistake in the rotating direction. Note that as a power source for the controller 5, a battery (not shown) or the like is employed.

In the figure, 38 is a chain saw operated by the power of the engine 7, and 39 is a universal joint.

According to the above, normally the engine 7 is started,
By rotating the speed change switch actuating lever 1 in the A direction, the forward rotation side feed speed change switch 3 is actuated.
Via the controller 5, the servo motor 6, etc., the transmission arm 14 in the neutral position N is switched to the forward rotation position U, and the engine 7 power is transmitted to the drive wheels 8 through the transmission mechanism 2 etc. to drive the drive wheels 8 in the normal rotation, The machine is raised against the trunk of the tree, and the branches on the way up are cut off with a chainsaw 38. When the aircraft rises to the height set in advance by the setting dial 34a, the timer 34 is activated, and the speed change arm 14 is switched to the reverse rotation position D via the controller 5 and the servo motor 6. At the same time, the drive wheel 8 ... switches to reverse drive, so the machine descends and the work is completed. However, if the engine stalls while the aircraft is ascending or descending, the transmission arm 14 remains in the forward rotation position U or the reverse rotation position D, so the engine 7 acts as a brake.
The aircraft will stop at that location. In such an emergency, a worker can easily and appropriately rotate the gear shift switch actuating lever 1, which is in the elastic holding position, using an operating rod from the ground to operate one of the gear shift switches 3 and 4 on the corresponding side. 5. When the transmission arm 14, which is in the forward rotation position U or the reverse rotation position D, is switched to the neutral position N via the servo motor 6, the drive wheels 8... become free rotation, and the aircraft is lowered from its stopping point by its own weight. , it can be recovered.

(g) Effects of the invention This invention with the above configuration is such that after the shift switch operating lever 1 is rotated to the position where the shift switches 3 and 4 are operated, the return spring 23 allows the shift switch operating lever 1 to return to the elastic holding position. Because of this structure, the shift switch actuating lever 1, which is in the elastic holding position, only needs to be rotated from the ground using an operating rod, making the operation easier than in the prior art.

Furthermore, when the shift switches 3 and 4 are operated by the rotational operation of the shift switch operating lever 1, the shift mechanism 2 is moved to the normal rotation position U or the reverse rotation position via the controller 5 and the servo motor 6. When D is reached, it is switched to the neutral position N, thereby causing the drive wheels 8 to rotate freely,
The machine can be recovered by its own weight even from the upper part of the trunk, allowing for quick response in emergencies such as engine stalling during pruning work.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the speed change operating device for a pruning machine according to this invention, Fig. 2 is a cross-sectional view of its main parts, and Fig. 3 shows a transmission path incorporating the speed change operating device. FIG. Code, 1... Gear switch operating lever, 2...
Speed change mechanism, 3... Speed change switch for forward rotation side feed, 4
... Speed change switch for reverse side feed, 5... Controller, 6... Speed change drive section, 7... Engine, 8...
... Drive wheel, 9 ... Transmission path, 23 ... Return spring,
U...Forward rotation position, N...Neutral position, D...Reverse rotation position.

Claims (1)

[Scope of utility model registration request] A transmission mechanism 2 capable of shifting between a normal rotation position U and a reverse rotation position D via a neutral position N is incorporated into a transmission path 9 that transmits the power of an engine 7 to an appropriate number of drive wheels 8, 8, . . . A speed change operating device for a pruning machine that operates a mechanism 2 to change speed in conjunction with a speed change switch operating lever 1, wherein the speed change switch operating lever 1 is provided so as to be rotatably returned to an elastic holding position by a return spring 23, The speed change switches 3 and 4 are within the rotational operation range from this elastic holding position.
, and each time the shift switch operation lever 1 is rotated from the elastic holding position, the shift switches 3 and 4 on the corresponding side are operated, and the controller 5,
Through the speed change drive section 6, the speed change of the speed change mechanism 2 is converted from the normal rotation position U to the neutral position N, from the neutral position N to the reverse rotation position D, and from the reverse rotation position D to the neutral position N. 1. A speed change operation device for a pruning machine, characterized in that the speed is changed from a neutral position N to a normal rotation position U.