JPH0333245Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention includes a main body that is removably attached around a tree trunk, a device that is provided on the main body and drives the main body to spiral around the tree trunk, and a main body that An automatic pruning machine having a saw blade chain guide bar attached to the tree trunk and extending in the length direction of the tree trunk, and an endless saw blade chain that slides around the guide bar and cuts branches extending from the tree trunk. Regarding machines.

Conventional technology Normally, the width of the annual rings of trees such as cedar and cypress differs considerably depending on the geographical direction. Therefore, the cross-sectional shape of tree trunks is often quite distorted. When pruning such a deformed tree trunk with a conventional automatic pruning machine, the branch may be sawed off at a considerable distance from the tree trunk.
For this reason, there was a problem that the pruning part was not finished neatly.

Problems to be Solved by the Invention Therefore, in order to solve the above-mentioned problems, the purpose of the present invention is to provide an automatic pruning machine that can always cut branches at a position extremely close to the tree trunk. do.

Means for Solving the Problems For the above-mentioned purpose, the present invention has a saw blade chain guide bar that is pivotably attached to the bracket part of the main body so as to be pivotable in the horizontal direction, and the saw cutting side of the guide bar is always directed toward the tree trunk side. It is characterized by a configuration in which a pressing member for pressing is slidably fitted into a hole opened in the bracket portion.

Effect: With the above structure of the present invention, the saw blade chain guide bar pivots horizontally in response to the contour shape of the tree trunk to maintain the saw blade chain at a predetermined distance from the tree trunk, and prevents the swinging due to the pivoting. Branches can be reliably sawed at a predetermined position close to the tree trunk while the saw blade chain has a wide cutting width.

Embodiments The present invention will be explained below based on embodiments shown in the drawings.

The automatic pruning machine of this embodiment has a main body 1 and a frame 20 that can be closed so as to hug a tree trunk T, as shown in FIG. The frame body 20 is used to rotate the
an endless belt B which is arranged on one side of the tree trunk T and is inclined with respect to the length direction of the tree trunk T and touches the periphery of the tree trunk T, and a transmission shaft and a speed reducer (not shown) which are attached to the main body 1. An internal combustion engine E rotatably drives the endless belt B via the frame body 20, and the endless belt B, which is tilted and rotatably attached to the other side of the frame body 20, cooperates with the endless belt B to hold the tree trunk T and rotate the main body 1. Auxiliary wheels W that move up and down while spirally turning around the tree trunk T
and has. Further, as shown in FIGS. 1 and 2, the main body 1 is provided with a saw blade chain guide bar 2 protruding upward from the top of the main body 1 in the vicinity of the tree trunk T and approximately parallel to the length direction of the tree trunk T. ing. Further, from the internal combustion engine E to the transmission shaft 3 and the clutch device 4,
A sprocket 5 is rotatably provided to be driven through the guide bar 2 and the sprocket 5. An endless saw blade chain 6 is movably installed on the guide bar 2 and the sprocket 5, and is driven by the rotation of the sprocket 5.
It is configured to saw off branches extending from.

A bracket portion 7 is integrally formed on the upper portion of the main body 1, and a pivot member 9 is pivotally attached to the bracket portion 7 via a pivot shaft 8. The axis of the pivot shaft 8 is aligned with the guide bar 2.
It is arranged substantially parallel to the longitudinal axis of the. The pivot member 9 connects the lower end of the guide bar 2 near the sprocket 5 with a pair of bolts 10 and nuts 1.
1, and thereby the guide bar 2
can be pivoted about the axis of the pivot shaft 8 in a direction perpendicular to its longitudinal axis, i.e. horizontally.

Further, as shown in FIG. 2, a hole 12 is formed in the bracket portion 7 of the main body 1 so as to open toward the tree trunk T side on the advancing side of the pivot shaft 8 when the machine is raised.
A pressing member 13 is installed in the hole 12 so as to be able to slide within the hole 12, and the pressing member 13 is always urged toward the tree trunk T by a compression coil spring 14. The pressing member 13 is connected to the pivot member 9 at its outer end.
The pivot member 9 is always pressed counterclockwise in FIG. The counterclockwise rotation of the pivot member 9 due to this is limited by the fact that the side 15 of the pivot member 9 opposite to the aircraft traveling direction abuts against the bracket portion 7.

A guide bar 2 whose one end is on the side opposite to the tree trunk T side is placed at a lower position by the upper branch sawing part of the guide bar 2.
The other end extends in the direction in which the main body 1 spirally moves upward around the tree trunk T, extends further forward beyond the cutting edge of the saw blade chain 6, and is capable of rotating the roller 18. A supporting arm member 16 is provided. The rollers 18 contact the periphery of the tree trunk T during operation of the pruning machine and hold the guide bar 2 in a position where the endless saw blade chain 6 does not directly contact the tree trunk T. Furthermore, the guide bar 2 is integrally formed with a hemispherical protrusion 19 at the upper part of the side surface on the tree trunk T side.
comes into contact with the tree trunk T, and the guide bar 2 along with the roller 18
is always held at a predetermined distance from the tree trunk T, and the branches are sawed off at a position close to the tree trunk T by the saw blade chain 6.

Effects of the invention With the structure of the invention explained above, even if the tree trunk to be pruned is a deformed tree, the saw blade chain is always guided in a position close to the tree trunk in accordance with its contour shape. By cutting branches and swinging out due to pivoting, the apparent width of the saw blade chain can be increased at all times, which provides excellent effects such as preventing excessive force from being applied to the saw blade chain guide bar. play.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of an automatic pruning machine according to the present invention, FIG. 2 is a partial cross-sectional view of the main part as seen from the direction of arrow A in FIG. The figure is a plan view of an automatic pruning machine attached to a tree trunk. 1...Main body, 2...Saw blade chain guide bar, 6
... Endless saw blade chain, 8 ... Pivoting axis, 13 ...
Pressing member, T...tree trunk.

Claims (1)

[Scope of utility model registration request] a main body removably attached around a tree trunk; a device provided on the main body for driving the main body to spirally rotate around the tree trunk; and a saw blade chain attached to the main body extending in the length direction of the tree trunk. In an automatic pruning machine having a guide bar and an endless saw blade chain that slides around the guide bar and cuts branches extending from a tree trunk, the main body is configured such that the guide bar is pivotable in a horizontal direction. An automatic machine characterized in that a pressing member which is pivotably attached to a bracket portion of the guide bar and which constantly presses the sawn side of the guide bar toward the tree trunk is slidably fitted into a hole opened in the bracket portion. Branching machine.