JPH0526305U - Bark stripping cutter - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a bark stripping cutter that can surely cut stripped bark into short lengths and has no bark entanglement. [Structure] Ring frame 1 rotatably mounted on the main machine frame 2
In a cutter 8 rotatably provided at each tip of a plurality of arms 5 pivotally mounted on a shaft, the cutter 8 rotates on the outer peripheral surface of a cutter boss 10 formed in a cylindrical shape. It is characterized in that a plurality of cutter tips 11 are provided so as to project from the front end face which is parallel to the axis and which is the direction of entry of the raw wood.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bark stripping cutter, and more particularly to a cutter suitable for a ring barker.

[0002]

[Prior Art]

 A ring barker is a ring-shaped frame with 3 to 4 arms with cutters attached to the tips, with the cutters facing the center of the ring. The ring-shaped frame is rotated while applying pressure so as to be urged toward, the raw wood is passed through the center of the ring-shaped frame, and the bark is peeled off by the cutter.

Of various types of raw wood, unlike a pine tree, when trying to treat a raw wood whose fibers are strong like a cedar and a Japanese cypress with a ring barker, the bark that has been stripped off may become entangled with the cutter and sometimes bark cannot be stripped. There is. For this reason, a cutter capable of performing bark stripping work while cutting entangled bark has been developed, and representative ones thereof are known from Japanese Patent Publication No. 59-150151 and Japanese Utility Model Publication No. 3-31527.

The former of the above-mentioned prior art is one in which a skin cutting blade is provided on the side surface of the cutter, and the bark connected to the unpeeled portion of the raw wood that has been peeled off by the cutter is shortened by the skin cutting blade. The feature is that it is cut.

Further, the latter of the prior art is also to be called an improved type of the former, in which the side surface of the cutter forms a guide chamfer part by scraping off the peripheral edge of the front end surface on the side where raw wood is supplied, It is characterized in that an auxiliary peeling blade, which has a lower blade height than the peeling blade provided on the entire circumferential surface of the cutter, is provided on the peripheral surface of the front end portion.

[0006] These conventional techniques were developed to cut stripped bark into short pieces, and a barb is provided on a side edge of the cutter or a guide edge formed on the front end of the cutter. However, since the blade height was low in all cases, the action as a cutting blade was limited, and it was not possible to eliminate all the entanglement of the bark.

In the improved ring barker, the cutter can be crimped to the raw wood when the raw wood is fed to the center of the ring, so that the case where the cutting edge is provided on the front side of the cutter is provided. Even if there is, it is possible to avoid inadvertently cutting the end face of the raw wood too much at the start of bark stripping, and chamfering the peripheral edge on the front side of the cutter to make the diameter smaller than the main body of the cutter and then cut the bark. Even if the blade is devised, the skin-cutting action is not completely performed, and the point is that the longer the skin-cutting blade, the more reliably the bark can be cut.

[0008]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to provide a bark stripping cutter that can surely cut stripped bark into a short size and has no bark entanglement.

[0009]

[Means for Solving the Problems]

 Means for solving the problems in the present invention include a ring frame rotatably mounted on a main body frame, a plurality of arms pivotally mounted on the ring frame, and a position on the opening side of the ring frame. In the cutter rotatably provided at the tip of each of the arms, the cutter has a front end face parallel to the rotation axis of the boss on the outer peripheral surface of the cutter boss formed in a cylindrical shape and in the incoming direction of the raw wood. It is characterized in that a plurality of cutter tips are provided so as to protrude from it.

[0010]

【Example】

 FIG. 4 shows an example of a ring bar car. Reference numeral 1 is a ring frame rotatably mounted on the main body frame 2, and a belt 4 is hung between the rotary shaft of the motor 3 and the ring frame 1. Is rotatably driven by a motor 3, and a plurality of arms 5 are swingably attached by a pivot 6 to the front surface of the ring frame 1. The base end of the arm 5 is connected to an air cylinder mechanism 7 provided on the ring frame 1, and a cutter 8 is pivotally attached to the tip of each arm 8, and each cutter 8 has the cylinder mechanism 7 described above. By the action of, the bark can be peeled off when it is urged toward the center of the opening of the ring frame.

The cutter 8 has a cylindrical shape, is attached to the tip of the arm 5 by a drive shaft 9, and is not shown in the arm 5 so as to be rotated as the ring frame 1 rotates. It is rotationally driven by the rotation transmission mechanism.

Next, details of the cutter will be described with reference to FIGS. 1, 2, and 3. The cutter 8 is provided on the outer peripheral surface of a cylindrically shaped cutter boss 10 with twelve cutter tips 11 protruding from the front end surface of the cutter boss 10 in the direction of entry of the raw wood and having different protruding lengths. Has been. Further, the cutter tip 11 has a front and rear end in a direction parallel to the rotation axis, that is, a front and rear end portion in the approach direction of the raw wood, and a taper portion 12 having a smaller outer peripheral diameter toward the terminal end is formed.

A concrete example carried out by the inventor is that the outer diameter of the cutter is 150 mm, the outer diameter of the boss portion is 92 mm, the longer length of the cutter tip is 94 mm, the shorter is 84 mm, the lateral width is 15 mm, and the height is 26 mm. The protruding length from the boss portion is 40 mm for a long chip and 30 mm for a short chip. Further, all the base ends of the cutter tips are aligned at the same position, and the tips are provided in order of one long tip and two short tips. Therefore, four long cutter tips 11a are provided with a phase of 90 degrees, and two short cutter tips 11b are provided between them.

Further, the cutter tip 11 is fixed to the cutter boss portion 10 with a lead angle of 20 degrees with respect to the axial direction of the rotating shaft, and when viewed from the end surface of the cutter boss portion 10, it is 15 degrees. It is inclined.

Although the embodiment has the above-mentioned structure, a supply device and a take-out device for supplying the raw wood while supporting the raw wood are installed in front of and behind the ring frame 1. In FIG. 4, the raw wood is fed into the ring frame from the front direction.

The raw wood is supplied to the opening of the ring frame 1 while rotating the ring frame 1. If the air pressure is not sent to the air cylinder mechanism 7, each arm 5 moves downward due to its own weight with the part of the cutter 8 facing downward. Therefore, since the opening of the ring frame 1 is open, the arm 5 faces the opening. To supply raw wood. When it is confirmed that the tip of the log reaches the cutter 8, the ring frame 1 is rotated, and at the same time, air pressure is sent to the air cylinder mechanism 7 to press the cutter 8 onto the log surface.

The cutter 8 strips off the bark with the cutter tip 11 and cuts the bark stripped off shortly by the protrusion projecting from the cutter boss 10, which may cause the bark to become entangled with the cutter during the cutter operation. Absent.

Further, since the cutter tip 11 is formed with the taper portion 12 at the front and rear ends with respect to the rotation axis of the cutter, the wood portion having the bark peeled off is not damaged.

[0019]

[Effect of the device]

 According to the present invention, the cutter is provided with a plurality of cutter tips on the outer peripheral surface of the cutter boss portion so as to project from the front end surface which is parallel to the rotation axis of the boss portion and which is the entrance direction of the raw wood. The bark peeled off by the protruding cutter tip is cut into short pieces, which can surely prevent the bark from being entangled in the cutter.

[Brief description of drawings]

FIG. 1 is a perspective view showing the entire cutter.

FIG. 2 is a sectional view of a cutter.

FIG. 3 is a front view of a cutter.

FIG. 4 is a front view showing an example of a ring bar car equipped with a cutter.

[Explanation of symbols]

 1 Ring Frame 2 Main Machine Frame 3 Motor 4 Belt 5 Arm 6 Axis 7 Air Cylinder Mechanism 8 Cutter 9 Drive Axis 10 Cutter Boss Section 11 Cutter Tip 12 Tapered Section

Claims (2)

[Scope of utility model registration request] 1. A ring frame rotatably mounted on a main body frame, a plurality of arms pivotally mounted on the ring frame,
In a cutter rotatably provided at the tip of each arm located on the opening side of the ring frame, the cutter is parallel to the rotation axis of the boss on the outer peripheral surface of the cutter boss formed in a cylindrical shape. A bark stripping cutter characterized in that a plurality of cutter tips are provided so as to project from the front end surface, which is the direction in which the raw wood enters. 2. The bark stripping cutter according to claim 1, wherein the cutter tips are provided with different lengths protruding from the cutter boss portion.