JPH02286201A - Lumber cutting machine and method therceof - Google Patents

Abstract

PURPOSE:To promote bite and cut of cutter blades and improve the accuracy of cutting dimensions by forming tapered surfaces slanted from the cutting end peripheries of cutter blades toward the outside of a cutter blade thickness direction, and constituting such that supporting members may not project out of the tapered surfaces or phantom extension lines of the tapered surfaces. CONSTITUTION:Through forming tapered surfaces 15, 15 on cutter blades 7,8, holding forces applied on the cutter blades 7,8 may be utilized effectively in dividing into a shearing force of cutter blades 7,8 for biting into a lumber 17 and a component force of arrow F, F directions for spreading the lumber 17 left and right from a cutting surface 18. The front end surfaces of the supporting members 5,6 is covered at the tapered surfaces 15, 15, and as a result, stepped parts between the supporting omicronembers 5,6 and cuter blades 7,8, do not occur and thus it becomes possible that the cutter blades 7,8 can bite deeply and smoothly into the lumber 17.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wood cutting machine and a wood cutting method used as an attachment for, for example, construction machinery.

(Prior Art) As a conventional example of this type of cutting machine, a structure as shown in FIG. 6 can be mentioned. In FIG. 6, two support members 40
．． 41 is rotatably connected at the right end in the figure and can be opened and closed in a substantially scissor shape. A cutter blade 42.43 is replaceably attached to the inner edge of this support member 40.41.

With the above cutting machine, when cutting wood, for example, as shown in FIG.
The cutter blades 42 and 43 are used to cut the wood 44.

In addition, as prior art related to this invention, for example, JP-A-61-57772, JP-A-60-55170,
There is Utility Model Publication No. 1554, 1983, etc.

(Problems to be Solved by the Invention) However, when trying to cut a soft material such as wood 44 with a conventional cutting machine, for example, the upper cutter blade 43 cuts into the wood 44 so as to push it through.
There is a drawback that the end face 45 of the support member 4N collides with the wood 44, which prevents the cutter blade 43 from cutting further into the wood 44. If the support members 40 and 41 are pinched with even greater force from this state, , the cutter blades 42, 43 and the support members 40, 41 as a whole crush the wood 44, resulting in significant deformation of the cut surface and an irregular fractured surface shape.Therefore, the conventional cutting machine It is not suitable for cutting soft materials such as wood 44 with relatively uniform cut surfaces, and when such conventional cutting machines are used, the material to be cut may be cracked or crushed, resulting in uneven cuts. It is not possible to obtain a sharp cut surface.

Furthermore, the blade surfaces of the cutter blades 42 and 43 are flat;
The cutter blade 42.4 is used for cutting in the cutting process as described above.
The biting resistance of No. 3 is large, so it is necessary to apply an unnecessarily large force, and the workability is also poor.

These drawbacks are due to the fact that conventional cutting machines are designed to be suitable for cutting hard objects such as steel, concrete, and rocks, and in the case of hard objects, the cutter blade 42. Since the cutter 43 does not dig deeply into the object to be cut, the above-mentioned drawbacks do not occur, but a cutting machine for hard objects is not suitable for cutting soft wood or the like.

This invention was made to solve the above-mentioned conventional drawbacks, and its purpose is not to crush soft materials such as wood into irregular fractured surfaces as described above, but to create a somewhat regular shape. An object of the present invention is to provide a wood cutting machine capable of cutting wood and a wood cutting method.

(Means for Solving the Problems) Therefore, the wood cutting machine according to the first aspect of the present invention includes a pair of support members connected to each other so as to be openable and closable, and a pair of support members provided on the inner edge of the support members. In a wood cutting machine comprising a cutter blade, a tapered surface is formed that slopes outward in the thickness direction of the cutter blade from the mutually intersecting cutting edges of the cutter blade, and the tapered surface or a virtual extension line of the tapered surface is formed. The support member is configured not to protrude from the support member.

The wood cutting method according to the second claim is characterized in that the wood cutting machine according to the first claim is used to cut the wood into a predetermined length in the primary treatment stage of the pulp manufacturing process.

(Function) In the wood cutting machine according to the first claim and the wood cutting method according to the second claim, the tapered surface of the cutter blade allows the cutter blade to bite into the wood easily and smoothly. It exerts a drafting action, and as the cutter blade digs in, the force that pinches the wood creates a component force that pushes the wood open from side to side, promoting the cutter blade's biting and cutting.

The support member is designed not to protrude from the tapered surface or the imaginary extension line even when the cutter blade digs deeply into the wood, so the support member does not prevent the cutter blade from digging into the wood, and the cutting operation becomes smooth.

(Embodiments) Next, specific embodiments of the wood cutting machine of the present invention will be described in detail with reference to the drawings.

In FIG. 2, which shows a well-known power shovel type shovel employing a wood cutting machine according to the present invention, a wood cutting machine 4 is provided on a power shovel main body 1 via a boom 2, an arm 3, and the like. This cutting machine 4 functions as a working means for the power shovel main body 1, and is detachably provided at the tip of the arm 3, and can be replaced with another working means such as a packet.

This cutting machine 4 is comprised of a pair of support members 5.6, a pair of cutter blades 7.8, a hydraulic cylinder 9, and the like. First, the support member 5.6 is connected to the fixed side support member 5 by the pin 1.
0.11 and is rotatably attached to the tip of the arm 3, and the rotatable side support member 6 is rotatably attached to the support member 5 with a pin 12 to form a substantially scissor shape that can be opened and closed. The cutter blade 7.8 is replaceably attached to the inner edge of the support member 5.6.

A hydraulic cylinder 9 is installed between the base end of the support member 5 on the fixed side and the tip end of the support member 6 on the rotation side. This hydraulic cylinder 9 has both ends connected to pins 13.1.
4 is rotatably connected to the support member 5.6,
It is adapted to be extended and contracted by hydraulic pressure supplied from the power shovel main body 1.

In FIG. 3 schematically showing the cutting machine 4 as described above,
Said cutter blade 7.8 extends over substantially the entire length of the support member 5.6. Also, the cutter blade 7.8 has a tapered surface 15.
．． 15 is formed.

This tapered surface 15.15 is inclined outwardly in the thickness direction of the cutter blade 7.8 from the cutting edge 16.16 of the cutter blade 7.8, and covers the entire inner edge of the support member 5.6. covered.

As shown in FIG. 1 (corresponding to the l-1 cross section in FIG. 3), which shows the cutting state in which wood is sandwiched between the cutter blades 7.8, the tapered surface 15.15 of the cutter blade 7.8 is connected to the supporting member. The support member 5.6 is formed so as to cover the entire surface of the support member 5.6 so as not to come into contact with the wood 17 even when the cutter blade 7.8 deeply bites into the wood 17. Therefore, a step unlike the conventional one does not occur between the cutter blade 7.8 and the support member 5.6, and the cutting of the cutter blade 7.8 is prevented from being blocked by the step. is being done.

Next, the operating state of the cutting machine 4 will be explained. When cutting the wood 17, the wood 17 is held between the cutter blades 7.8 and the hydraulic cylinder 9 is extended, so that the supporting member 6 on the rotating side closes against the supporting member 5 on the fixed side. It rotates to exhibit a scissor-like shearing action and cut the wood 17.

During this cutting, as shown in Fig. 1, the cutter blade 7.8
Even if the support member 5.6 is deeply dug into the wood 17, the support member 5.6
is covered with a tapered surface 15.15, and the supporting member 5.
6 comes into contact with the cut surface 18 of the wood 17, and the cutting of the cutter blade 7.8 into the wood 17 is not prevented, and the cutting of the cutter blade 7.8 becomes smooth. Moreover, as the cutter blade 7.8 bites into the wood 17, the inclined taper surface 15.15 acts like a cutter, and as the cutter blade 7.8 bites into the wood 17, the cutter blade 7.8 This clamping force generates a force that pushes the wood 17 open from the cutting surface 18 to the left and right, and this force acts in the directions of arrows A and A, promoting cutting of the wood 17 and making it easier to cut the wood 17. .

In this embodiment as described above, the cutter blade 7.8
By forming the tapered surface 15.15 on the cutter blade 7.8, the pinching force applied to the cutter blade 7.8 is reduced.
It is possible to effectively utilize the force by dividing it into the component force in the direction of arrow A and arrow A for pushing the force outward and spreading it left and right. In addition, since the tapered surface 15.15 covers the entire end surface of the support member 5.6, the support member 5.6 in the case of FIG. 1 is different from the conventional example shown in FIG. No step occurs between the cutter blade 7.8 and the cutter blade 7.8, making it possible to deeply and smoothly bite the cutter blade 7.8 into the wood 17.

Although specific embodiments of the wood cutting machine of this invention have been described, the wood cutting machine of this invention is not limited to the above embodiments, and can be implemented with various modifications within the scope of this invention. is possible.

For example, in the above embodiment, the tapered surface 15.15 of the cutter blade 7.8 covers the entire end surface of the support member 5.6, but this is not necessarily limited to this case.
As shown in the figure, a tapered surface 20 is formed on the support member 19, and a small angle γ is separated between the inclination angle α of the tapered surface 15 of the cutter blade 7.8 and the inclination angle β of the tapered surface 20, Alternatively, the configuration may be such that β is not larger than α, so that the tapered surface 20 of the support member 19 does not come into contact with the wood 17 even when the cutter blade 7.8 bites into the wood 17. Furthermore, as shown by the imaginary line in FIG. 4, a flat portion 22 may be formed on the cutting edge of the cutter blade 7.8 to prevent the cutting edge from chipping.

Furthermore, as shown in FIG. 5, the cutting edge of the cutter blade 7.8 may be formed into a wave-shaped curved blade 23 to prevent the wood 17 from escaping from the cutting edge when the wood 17 is pinched. good.

The wood cutting machine described above is suitable for use, for example, in the primary treatment stage of a pulp manufacturing process. In other words, it is used in the process of cutting construction waste, raw wood, and other wood into predetermined lengths, and in this type of usage, it is possible to obtain a more even cut surface than before, and the cutting accuracy is also improved. This will allow you to take advantage of the benefits even more effectively.

(Effects of the Invention) As described above, in the wood cutting machine according to the first claim of the present invention and the wood cutting method according to the second claim, the cutter blade can be easily moved against the wood by the tapered surface of the cutter blade. The cutter blade can be cut into the wood smoothly and smoothly, and the tapered surface has a simulating effect, and as the cutter blade cuts into the wood, the force that pinches the wood can generate a force that pushes the wood open from side to side. It can promote the biting and cutting of the cutter blade.

The support member is designed so that it does not protrude from the tapered surface or the virtual extension line even when the cutter blade is deeply dug into the wood, which prevents the support member from blocking the cutter blade from digging into the wood, making the cutting operation smoother. can. Therefore, the cut surface of the wood becomes a more regular cross-section than before, and the accuracy of the cut dimensions is also improved.

[Brief explanation of drawings]

Fig. 1 is a structural schematic diagram showing the cutting operation by the cutting machine of the present invention, Fig. 2 is a structural schematic diagram of a power shovel, Fig. 3 is a structural schematic diagram illustrating the main parts of the cutting machine, and Fig. 4 is another implementation. FIG. 5 is a structural diagram showing yet another embodiment. FIG. 6 is a structural diagram showing a conventional example. FIG. 7 is a structural diagram showing A of FIG. 6.
-A sectional view. 4... Cutting machine, 5.6... Support member, 7.8...
Cutter blade, 15...Tapered surface, 17...Wood. Patent Applicant Okada Aiyon Co., Ltd. Figure 4 Figure 6 Figure 7

Claims (1)

[Claims] 1. A wood cutting machine comprising a pair of support members connected to each other so as to be openable and closable, and a pair of cutter blades provided on the inner edge of the support member, in which the cutter blades intersect with each other. A cutter blade for wood, characterized in that a tapered surface is formed that slopes outward in the thickness direction of the cutter blade, and the support member is configured not to protrude from the tapered surface or a virtual extension line of the tapered surface. Cutting machine. 2. At the primary treatment stage of the pulp manufacturing process,
A method for cutting wood, comprising cutting wood into a predetermined length using the wood cutting machine according to claim 1.