JPS62143622A - Cutter of automatic pruning machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial application fields> The present invention is made from cedar and cypress trees! Remove the main machine frame 4J to If.

This relates to an automatic pruning machine in which a blade rotates around a tree trunk to cut branches.

<Prior art> Automatic pruning machines are used to cut branches, whether they are of the type in which the main body moves up and down in a direction perpendicular to the tree trunk and only the blade part rotates, or the type in which the main body moves up and down while rotating. This is done using a cutting tool such as a circular saw blade 5 or a chainsaw. If there is no bend in the tree trunk, there is no problem and you can simply equip it with a knife. Further, it is sufficient to provide a branch detection section on the upper part of the blade to determine whether to cut now or during the next rotation. In that case, the blade is moved only in the vertical direction, and the blade is always pressed close to the stem (for example, in the Utility Model Act of 1983-3
No. 3285). In addition, a model in which the chainsaw is mounted so that it can move in and out from the transmission case side to the frame side has been proposed (Utility Model Application No. 59-55460), but this also has a structure in which the chainsaw is always biased towards the frame side. be.

<Problems to be solved by the invention> In reality, many trees have curved or uneven parts on their trunks.
According to the automatic pruning machine with the above-mentioned structure, the bending of the tree trunk,
The problem was that the cutter could not follow the deformation of the cross section (from a perfect circle to an ellipse), resulting in the cutting of the trunk.

The situation is shown in Figure 6. In other words, if there is a branch (2) in the convex part shown by the solid line, the knife (3) will also cut a part of the tree trunk (1), and if there is a branch in the concave part of the curved part as shown by the two-dot chain line, the blade (3) will also cut a part of the tree trunk (1). In the case of (2), the remaining branches had the disadvantage of being long.

<Means for Solving the Problems> Therefore, in order to solve the above-mentioned problems, the present invention provides an automatic pruning machine in which the blade (3) is movable toward the main body in the radial direction of the tree trunk. The blade is attached so that it is always isolated from the tree trunk, and the blade is brought into pressure contact with the tree trunk only when a branch sensor (4) installed before the blade moves forward detects a branch. As a concrete example, a slide fitting (6) linked to a connecting link (5) connected to a branch sensor (4) is moved along a guide bar (8) against a cutter isolation spring (7). It can be moved to show the structure in which the blade attached to the slide fitting comes into pressure contact.

It is also possible to send a detection signal from the branch sensor to a motor and a solenoid to release the cutter from the tree trunk.

In the cutting device of the automatic pruning machine having the above structure, the branch 1-'J (4) rotates due to the presence of the branch, and the connecting link (5) connected to this rotates; The attached slide fitting (6) moves along the guide bar (8) against the isolation spring (7) of the cutter, and the cutter attached to the slide fitting is pressed in the direction of the tree trunk. .

<Example> Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view of an automatic pruning machine equipped with the l/J cutting device of the present invention. FIG. 2 is a front view of the cutting device, and FIG. 3 is a plan view thereof. 4(a) to 4(C) are schematic plan views showing the state of cutting, and FIG. 5 is a schematic side view of the same.

The automatic pruning machine shown in FIG. 1 is of a type in which the main body (10) moves up and down in a direction perpendicular to the tree trunk, and the blade part (11) rotates. The main body (10) has a structure in which an elevating drive device and a concentric device for keeping the elevating shaft unit 1 and a plurality of elevating wheels concentric are provided to the machine frame surrounding the tree trunk. The cutter section (11) constitutes the cutting device, and is composed of a drive device (12) consisting of a reducer and a control section, a prime mover (13), a rotation device (15) consisting of a rotation base (14) and a rotation axis, etc. The cutting and rotating device cuts branches while circling around the tree trunk. The cutting device of the present invention is not limited to the above-mentioned automatic pruning machine, but can also be applied to a spiral lifting type that moves up and down while rotating the main body.

The cutting device is shown in detail in FIGS. 2 and 3, but the entire device can be unclamped by the crimping arm (16) when necessary. For this purpose, a pressure contact arm (16) is elastically supported by a pressure contact spring (19) on a pressure contact drive shaft (18) which is rotatable by a gear case (17) within the main body cover. A pressure roller (20) is provided at the tip of the pressure arm (16). The pressure roller (20) is
Two parallel cutting device guide bars (21) provided on the rotating base (14) side. A roller guide provided on the side surface of the l1lJ cutting f1 gnome (22) which is attached to the (21) so as to be movable left and right. (2:l) is loosely fitted.

If the pressure welding arm (16) is always resiliently supported by the pressure welding splinter J (01) in the direction B in Fig. 3, that is, in the direction of the tree trunk, it is possible to press the guide roller at the lower end of the cutting frame (22) in the direction of the tree trunk. can. This ensures that the cutting device always circles around the tree trunk at equal distances.

Conversely, when the pressure contact arm (16) is tilted in the direction A, the guide roller separates from the tree trunk.

In addition to the pressure contact mechanism in the direction of the tree trunk, this cutting device is equipped with a branch and a detection part (24) on the top of the blade (3) to detect whether to cut now or during the next rotation. can. The blade (3) and the detection unit (24) are connected to the cutting frame (
It is attached to a slide fitting (26) that is externally inserted into a guide vane (25) provided in the vertical direction of the spring (22), and the slide fitting (2G) is attached to a spring (27) from below.
) is supported by When a branch that cannot be cut hits the detection part due to these combinations, the branch can be avoided by pushing the blade downward.

According to Fig. 4 (a) to (c), the cutlery (3) is used only when there are branches.
) was shown approaching the tree trunk. That is, (a)
This shows how the branch sensor (4) first senses the branch (2), and in (b), the knife (3) approaches the trunk of the tree and cuts the branch. After cutting the branches,
As shown in (C), the branch sensor (4) returns to its original position, and at the same time the blade (3) also leaves the tree trunk (1).

As described above, in the present invention, the blade is brought into pressure contact with the tree trunk only when cutting is necessary, that is, only when the branch sensor (4) detects a branch.

For this purpose, as shown in FIGS. 2 and 3, the branch sensor (4) is linked to the connecting link (5) via a sensor mounting shaft (29) and a spring (28) extrapolated thereto. The connecting link (5) is connected to the slide fitting (6) and the shaft (
30). This slide fitting (6)
Then, the branch sensor (4) comes into contact with the branch and the point C in Fig. 3 is reached.
When the angle is changed in the direction, the cutter moves along the guide bar (8) against the isolation spring (7), and the cutter (3) attached to the slide fitting comes into pressure contact with the tree trunk. Further, at this time, the distance between the cutter and the tree trunk is kept constant by the tree trunk contact guide (31), and the remaining branch length is ensured.

<Effects of the Invention> According to the cutting device of the automatic pruning machine of the present invention, as shown in FIG. If the branch is in a convex part due to a deformed cross section that is different from a perfect circle, the blade (3) will cut the branch without cutting the trunk (solid line is shown), and if the branch is in a concave part, the remaining branch will be removed. can be cut so that it is as short as possible (indicated by a two-dot chain line).

Branches can be cut with a small remaining branch length without causing unnecessary damage to the tree trunk.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an automatic pruning machine equipped with a cutting device of the present invention. FIG. 2 is a front view of the cutting device, and FIG. 3 is a plan view thereof. 4(a) to 4(c) are schematic plan views showing the state of cutting, and FIG. 5 is a schematic side view of the same. FIG. 6 is a side view of the conventional example. (1) Tree trunk (2) Branch (3) Cutting tool (4) Branch sensor (5) Connection link (6) Slide fitting (7) Isolation spring (8) Guide bar (16) Pressure arm (18
) Pressure drive shaft (19) Pressure spring (20) Pressure roller (21) Guide bar of cutting device (22) Cutting frame (23) Roller guide (3
1) Tree trunk contact guide or higher

Claims (1)

[Scope of Claims] 1. In an automatic pruning machine in which a blade rotates around a tree trunk to cut branches, a blade (3) is attached to the main body so as to be movable in the radial direction of the tree trunk, and the blade is always isolated from the tree trunk. A cutting device for an automatic pruning machine, characterized in that the cutting tool is brought into pressure contact with the tree trunk only when a branch sensor (4) provided before the cutting tool advances detects a branch. 2. The slide fitting (6) linked to the connecting link (5) connected to the branch sensor (4) is connected to the cutter isolation spring (
7) The cutting device for an automatic pruning machine according to claim 1, wherein the blade (3) attached to the slide fitting moves along the guide bar (8) against the tree trunk.