JPH0315002Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a protection device for a branching machine that avoids cutting of branches at the tip of the branching machine, and prevents stalling and tearing of branches.

(b) Prior Art A pruning machine as shown in FIG. 3 has been known for some time.

That is, the tree trunk 3 is held by the driving wheels 1, 1, . . . and the idle wheels 2, 2, and the driving wheels 1, 1, .

The power of the prime mover 4 is transmitted to the chain chain 6 and drive wheels 1, 1, . . . via a transmission case 5 containing a forward/reverse switching transmission mechanism.

The forward/reverse switching transmission mechanism has a structure that automatically switches from normal rotation to reverse rotation when the pruning machine rises by a predetermined amount. It is a structure that changes.

Also, Chiensou 6 is the Chiensou bar 7.
is installed above the aircraft and is configured to sequentially cut branches while ascending.

By the way, this type of pruning machine is called Chiensou 6.
When pruning with the tip, the resistance increases as the tip is pressed from above and from the front, and the semicircular tip rotates at a high circumferential speed, further increasing the resistance.

Further, at the tip of the chain 6, there is a positioning body 20 that maintains a constant distance between the trunk 3 and the chain 6.
is provided protrudingly, and when the chain saw 6 cuts a certain amount into the branch, the positioning body 20 and the cut end will interfere with each other, and as the cut progresses further, the base part 8 of the branch will be cut as shown in FIG. Since the branch is cut with some parts left uncut, the branch hangs down due to its own weight, narrowing the cut end and pinching the tip of the chain saw 6, which further increases the cutting resistance.

In this way, the cutting of the branch at the tip of the chain saw 6 increases the load on the prime mover 4 and induces engine stall.

In addition, recovering the pruning machine that has stalled in the middle of the trunk 3 takes time and reduces work efficiency.

On the other hand, if the engine stall of the prime mover 4 does not occur, the branch with the uncut portion may be forcibly pulled in the direction of movement of the pruning machine, causing it to tear, or the uncut portion may be removed from the branch after the chain cutting machine 6 has passed. It broke under its own weight, leaving a scar on trunk 3.

The damage caused when a branch is torn or broken creates a depression on the outer periphery of the trunk 3, and as rainwater, etc. enters into this depression, the trunk 3 rots over time, making it impossible to obtain a good tree. .

In order to solve these problems, the present applicant previously filed an application for a protection device for a pruning machine as described in Japanese Utility Model Application Publication No. 86559/1983.

In other words, the applicant places the
A sensor is provided to detect branches, and the signals transmitted by the sensor are used to tilt the chain, move the chain in and out, or change the lead angle of the drive wheel.
We are proposing a method that avoids cutting branches at the tip of the tree.

(c) Problems to be solved by the invention In the conventional protection device for pruning machines, the tilting of the chainsaw, the movement in and out of the chainsaw, or the lead angle of the drive wheels are changed by the transmission of signals from a sensor. The following problems occurred.

In other words, when the chain is tilted, the cutting angle changes with respect to the branch that is cut on the straight part of the chain, the cut end of the branch becomes higher, the outer skin of the cut end is not rolled in, and no knots are produced. There was a problem that it was not possible to obtain the desired results.

In addition, in the case of a device that moves the chienso in and out, if the branch is cut in the middle above the straight part of the chienso, the branch will be cut twice and the cut surface will be damaged. A number of problems arose.

Furthermore, in the case where the lead angle of the drive wheels is changed, there is a problem that as the lead angle increases, the load on the chain wheel increases and the engine stalls.

In any of these forms, the structure becomes complicated and the manufacturing cost increases, which is a major problem.

The present invention makes it possible to avoid the branch from the tip of the tree without changing the position of the tree with respect to the set trunk when a branch coming to the tip of the tree is detected by the branch detection device, and to avoid the branch from the tip of the tree in a straight line. To provide a protection device for a pruning machine which can cut branches at a low height without damaging the cut surface thereof, and which does not increase load or complicate the structure.

(d) Means for solving the problem In order to achieve the above object, the protection device of the pruning machine of the present invention holds the trunk of the tree between the drive wheel and the idler wheel, and twists the branch in a spiral manner. A branch detection device is installed in front of the tip of the chainsaw to detect contact of a branch with the tip of the chainsaw 6, and a forward/reverse switching transmission mechanism for driving the drive wheels is built into the transmission case. In the branch cutting machine, the branch detecting device and the forward/reverse switching transmission mechanism are interlocked by an interlocking device, and a return mechanism is provided to operate the forward/reverse switching transmission mechanism, and the branch detecting device is configured to operate the forward/reverse switching transmission mechanism. When detected, the forward/reverse switching transmission mechanism is switched to the reverse side to reverse the drive wheel, and when the branch detection device no longer detects the branch,
The return mechanism switches the forward/reverse switching transmission mechanism to the forward rotation side, causing the drive wheels to rotate forward.

(E) Function The pruning machine configured as described above cuts branches by means of a chain cutting machine while the machine body moves spirally up the outer periphery of the trunk. When it hits a branch and senses that the branch is coming to the tip of the chain, the interlocking device is activated, switches the forward/reverse switching transmission mechanism to the reverse side, reverses the drive wheels, lowers the aircraft, and maintains the aircraft at a constant level. After descending by the amount, the return mechanism switches the forward/reverse switching transmission mechanism to the forward rotation side, causing the drive wheels to rotate forward and the aircraft to rise.

After this drive wheel reverses and the aircraft descends, the drive wheels rotate forward again and the aircraft rises, causing a slip in the drive wheels. When the position of the aircraft lowers or rises, the branch detection device, i.e., the tip of the tree, avoids the branch and passes below or above it, and if the tip of the tree passes above the branch, , the branch is cut by the straight part of the chienso.

Normally, branches can be avoided with one movement, but in the unlikely event that a branch still hits the branch detection device during the descent and ascent of the aircraft, the above process will be repeated again to avoid the branch. disconnect.

(F) Embodiment To explain the embodiment with reference to the drawings, in FIGS. 1 and 2, the pruning machine has drive wheels 1,
1, 1... and idler wheels 2, 2 are provided in the upper and lower stages,
Power is transmitted to the drive wheels 1, 1, .

Above the fuselage, a chain 6 that stands up and has a chain bar 7 is installed, and the chain 6
A pressing piece 11 of the branch detection device 10 is located in front of the tip of the
is provided.

As the branch detection device 10, in this embodiment, a rotating body 12 is used which is rotated and displaced by a pressing piece 11 pressed against a branch, and its shape can be determined in various ways, but it can be roughly divided into the following two types. Conceivable.

That is, before the chiensou 6 engages with the branch,
The pressing piece 11 of the branch detecting device 10 comes into contact with the branch [FIG. 2A], and the pressing piece 11 of the branch detecting device 10 comes into contact with the branch immediately after the chain saw 6 engages with the branch, Twigs can be cut off [Figure 2 B]
Both are different in the position of the pressing piece 11 with respect to the tip of the chain saw 6.

Incidentally, even if this detection device 10 is an electric type,
It may be mechanical, and various types are possible.

The rotating body 12 of this branch detection device 10 is interlocked by a forward/reverse switching lever 14 of a forward/reverse switching transmission mechanism 9 that reverses the driving wheels 1, 1, . . . and an interlocking device 13 constituted by a link mechanism. The forward/reverse switching transmission mechanism 9 is composed of the above-described forward/reverse switching lever 14, a fork 16 that transmits the displacement of the forward/reverse switching lever 14 to the sliding body 15, a normal rotation gear 17, and a reverse rotation gear 18. .

The above-mentioned rotating body 12 is attached to the chain seat bar 7, has its lower end pivoted to a proper position on the body, and is always urged by a spring forming a return mechanism 19 to a predetermined position on the front side.

The pruning machine configured in this way has drive wheels 1, 1
By the normal rotation of the machine, the branch is cut by the straight part of the chienso 6 while rising spirally around the outer circumference of the trunk. During the upward movement of this machine, the branch engages with the tip of the chienso 6. When the branch is engaged with the tip of the chain cutting bar 7 [FIG. 2 B], the pressing plate 11 of the branch detection device 10 moves the helical vertical movement of the pruning machine. As a result, it is pressed and rotated backward together with the rotating body 12.

Due to this backward displacement of the rotating body 12, the interlocking mechanism 1
3. The sliding body 15 is slid via the forward/reverse switching lever 14 and the fork 16, and the reverse gear 18 is driven to rotate.

Then, the drive wheels 1, 1, . . . reversely move downward, and the aircraft retreats from the branch and begins to descend. However, when the machine moves backward and descends by a predetermined amount, the pressure of the branch against the pressure plate 11 of the branch detection device 10 is removed, so the branch Detection device 10
is rotated back to its original position by the return mechanism 19.

By the return of rotation of the branch detection device 10, the forward/reverse switching transmission mechanism 19 is also activated, operating the sliding body 15 to the forward rotation side, the forward rotation gear 18 is transmitted and rotated, and the drive wheels 1, 1, . . . The aircraft rotates forward and ascends again.

When the pruning machine descends and rises again, the position of the branch relative to the branch detection device 10 changes, so that the branch detection device 10 avoids passing below or above the branch.

In other words, when the pruning machine switches between descending and ascending again, slip is induced in the drive wheels 1, 1, etc. due to the inertial force generated and the load of the machine during descending and ascending, and the descending lead and ascending lead Due to the difference in the position of the branch detection device 10 and the branch due to the fact that cutting resistance is not applied to the chain saw 6 when it rises again and the rising lead becomes extremely large, the positional relationship between the branch detection device 10 and the branch is different. The relative position of the tip of the chiensou 6 and the branch is different, and the tip of the chiensou 6 either passes below the branch or
Cut the branch by its straight section.

In normal cases, this can be avoided with a single operation, but in the unlikely event that the branch detection device 10 comes into contact with the same branch despite the aircraft rising again, the branch detection device 10 [Chiensou 6 ] repeats the above process again to cut the branch.

(g) Effects of the invention Since the present invention is configured as explained above, it produces the effects described below.

1. Since branches are not cut at the tip of the tree, the machine will not stall on its way up the trunk due to biting of branches, improving work efficiency.

2 The branches coming to the tip of the chain tree are avoided by raising and lowering the machine by forward and reverse rotation of the drive wheels, so the set position relative to the chain tree trunk and branches does not change, and the branch is always cut at the straight part of the chain tree. The branches can be cut at a constant height from the tree surface, and the branches can be cut low without damaging the cut surface, and there is no increase in load.

Furthermore, because of the above, the cutting marks on the branches are low and constant, so that when pruning is performed again later, the pruning machine can run smoothly, and work efficiency can be improved in this respect as well.

3. In particular, the forward/reverse switching transmission mechanism that switches between raising and lowering the aircraft uses the one that was included in the conventional aircraft, and only adds a branch detection device and an interlocking device, so it has fewer parts and a simpler structure. It's easy.

4. Since no overload is applied to the chain saw or the drive wheels, the engine output can be effectively used to drive the chain cutting branches, and it is economical in terms of fuel consumption.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of the pruning machine of the present invention, Fig. 2 is its front view, Fig. 3 is a front view of a conventional pruning machine, and Fig. 4 shows the cutting action at the tip of the chain cutter. It is a partially cross-sectional explanatory diagram. DESCRIPTION OF SYMBOLS 1... Drive wheel, 2... Idle wheel, 6... Chain rotation, 9... Forward/reverse switching transmission mechanism, 10... Branch detection device, 13... Interlocking device, 19... Return mechanism.

Claims (1)

[Scope of utility model registration request] The driving wheel 1 and the idler wheel 2 hold the tree trunk 3,
Move the chain 6 up and down in a spiral,
A branch detection device 10 is provided in front of the tip of the chain saw 6 to detect contact of a branch with the tip of the chain saw 6, and a forward/reverse switching transmission mechanism 9 for driving the drive wheel 1 is built in the transmission case 5. In this branching machine, the branch detection device 10 and the forward/reverse switching transmission mechanism 9 are interlocked by an interlocking device 13, and a return mechanism 19 for operating the forward/reverse switching transmission mechanism 9 is provided, When the branch detecting device 10 detects a branch, the forward/reverse switching transmission mechanism 9 is switched to the reverse side to reverse the driving wheel 1. When the branch detection device 10 no longer detects a branch, the return mechanism 19 switches the forward/reverse switching transmission mechanism 9 to the reverse side. A protection device for a pruning machine, characterized in that the drive wheel 1 is rotated in the normal direction by switching the wheel 9 to the normal rotation side.