JPS60244Y2 - knife in ring barker - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a new ring barker cutter knife for debarking logs.

Ring barker cutter knives generally have a fairly sharp cutting edge that can be used to strip the bark.

Although the cutter knife according to this invention is a ring barker, it generally belongs to cutter knives that tend to be cut off by striking.

When stripping foreign materials such as fir and Japanese tsuga, and domestic materials such as cedar and cypress, using a sharp cutter knife will damage the surface of the wood, reducing the value of the material, and will cause the wood to be stripped. Because the bark has long fibers, it gets entangled with the knife arm that rotates around the log, making it impossible to perform a smooth peeling process.For this reason, in this design, a neck is attached to the tip of the knife arm. A cutter knife that can be swung is attached, and the cutter knife has three or more blades around the shaft, and the blades are shaped by the strength of the friction between the cutting edge of each blade and the bark of the tree. The entire board is rotated about the axis, and the rotation of the vanes scrapes and strips off the bark.

Since the cutter knife has this structure,
The cutter knife does not cut into the wood with its cutting edge, the bark fibers that are cut into pieces by the cutter knife's cutting edge are shredded without forming bundles, and the blades of the cutter knife are not forced to rotate. , the cutter knife rotates toward the side of the scraped bark fiber mass that has greater resistance, and falls off from the cutter knife.

This invention will be explained below according to the illustrated embodiments.

FIG. 1 shows a knife arm holding and rotating mechanism common to ring barkers.

The knife arm 1 is configured to press a cutter knife 3 at its tip against the bark surface of the log A by means of a cylinder 2.

The cylinder 2 and the ring 4 to which the knife arm 1 is pivoted are then rotated in the direction of the arrow.

This rotation causes the cutter knife 3 attached to the tip of the knife arm 1 to scrape off the bark of the log A.

Figure 2 shows a detail of the cutter knife 3 pressed onto the bark side of logs A, A', A''.

The hatching indicated by 11 is located on the knife arm 1.
There is a horizontal holding part formed at the tip of the horizontal holding part, which may be a part formed by bending the parts 1, 1, and 1.

This holding part 11 is provided with a stepped through hole 12 in the vertical direction, and a cutter knife 3 is attached thereto.

The cutter knife 3 is made up of four vanes 31 and a boss 33 that brings them together and firmly integrates them into a shaft part 32.

The blade edge 34 of the blade plate 31 has a semi-circular rounded edge at the edge of the plate surface.

What is essential about this shape is that there is a part close to the hoss 33 and a part moving away from the bark surface, that is, a retreating part 35.

In other words, the cutting edge 34 protrudes in a semi-circular arc shape at a portion away from the axis center line of the cutter.
There may also be a substantially triangular wing plate formed with
(See figure 1').

Further, the cutting edge 34 is rounded at the corner of the thickness of the wing plate so as not to damage the pedestal.

The cutter knife 3 is constructed by inserting, for example, a spherical bushing 41 into which the shaft portion 32 is fitted, a socket 42 that complementarily receives the spherical surface of the bushing, and a stepped portion of the hole 12, and inserting the socket 42 into the socket. ~The shaft portion 32 is attached to the bearing which is fixed with the tubing ring 43.
is inserted and attached with a nut 45 via a spacer 44.

In this way, the cutter knife 3 is attached to the holding part 11 so as to be rotatable about the shaft part 32 and to be able to tilt and oscillate about the axial center line of the cutter knife 3.

When peeling was performed using the cutter knife 3 (diameter: 40 mm) according to the illustrated device and applying a pressure of 0 to 600 kg, the long fiber bark of cedar, cypress, etc. was peeled off very smoothly.

During this peeling process, the cutter knife 3 rotated and changed direction clockwise or counterclockwise at any time, cutting and scraping the bark with the cutting edge of the wing plate, and also peeling off the bark in the direction of the fibers as it rotated. .

As mentioned above, according to the cutter knife of this invention,
To enable smooth peeling of bark without damaging the skin of a log and without getting the bark entangled with a knife.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the operation of the knife arm to which the cutter knife according to the invention is attached, and Fig. 2 is a diagram showing the operation of the knife arm to which the cutter knife according to the invention is attached.
It is a partially enlarged view showing details of the knife. Explanation of symbols, 1: knife arm, 2: shilling, 3: cutter knife, 11; holding part of cutter knife 3,
12: Through hole, 31: Wing plate, 32: Shaft, 33: Boss,
34: Cutting edge, 35: Recessed portion, 41: Bush with spherical surface, 42: Socket, 43 Nist spring, 44 Nice spacer, 45: Nut.

Claims (1)

[Scope of utility model registration request] A horizontal holding part is provided at the tip of the knife arm to hold the cutter knife in a removable and replaceable manner.
The knife has a shaft that penetrates the holding part, and has three or more blades extending in the horizontal radial direction and the bark surface direction fixed to the tip of the shaft, and the bark contacting tip of the plate surface of each blade. The edge has a semi-circular roundness and the cutting edge has a retracted part near the center line of the shaft, making it possible for the shaft to rotate and swing in the penetrating part of the holding part. A cutter knife in the ring barker where it is held.