JPS62104702A - Lumbering device - 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 (Field of Industrial Application) The present invention relates to a sawmilling device, and particularly to a sawmilling technique for straight-grained slope boards.

(Conventional technology) Conventionally, when sawing straight-grained boards from cedar or pine logs, the fourth
As shown in the figure, it is common to cut a log 100 into four pieces and then sequentially cut the logs parallel to the cut surfaces 101, 101.

(Problems to be Solved by the Invention) However, when cutting is performed in the conventional manner, the plate material 102 facing the cut surfaces 101, 101 when cut into four pieces,
For No. 102, a regular straight grain can be obtained, but as the planking progresses, the wood grain becomes a straight grain and the width of the board can only be made narrow.

That is, in the past, there was a problem in that only a small amount of wide, straight-grained board material could be obtained.

(Means for Solving the Problems) The present invention was invented in order to solve the above-mentioned conventional problems, and its purpose is to saw all logs into straight-grained boards. An object of the present invention is to provide a sawmilling device that can perform the following tasks.

In order to achieve this objective, one of the lumbering apparatuses of the present invention is provided.

The log side machine that fixes the half-split log that is split into two along the length, and the side machine that attaches the circular saw can be moved in the length direction of the half-split log. The part side machine base is formed by a main frame and a movable frame to which a saw motor is attached, and a circular saw is attached to the saw motor so as to be parallel to the halved log, and a circular saw is provided. The movable frame is rotatably provided on the main frame so that the direction of the saw can be varied around the pith of the log.

(Function) In the sawmill of the present invention, the circular saw is installed parallel to the length direction of the halved log, and the movable frame to which the saw motor is attached is rotatably installed on the main frame. A half-split log fixed to a side machine stand can be cut along the length along a radial line passing through the log while increasing the thickness in the circumferential direction.

Therefore, when a half-split log is cut in this way, the direction of the cut surface is all in the radial direction of the log, so a straight-grained slope board with annual rings appearing parallel to the cut surface is produced. .

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.゛The sawmill A of this embodiment includes a log side machine stand 1, a section side machine stand 2, a saw motor 3. The main configuration is a circular saw 4.

The log side machine 1 is constructed of a cart 11 that moves horizontally on rails 10.10 (in the front and back directions of the drawing in FIG. 1
In the figure, the head block 13 is provided so as to be slidable in the left-right direction of the drawing), and the head block 13 has a structure in which fixing claws 15 each having a presser screw 14 are pivotally attached to the distal ends of the head blocks 13.

Next, the side machine stand 2 has a main frame 21 to which arcuate frames 20.20 formed around the centerline C are fixed to face each other on the left and right, and the arcuate frames 20.20. A movable frame 23 is slidably constructed along the outer circumferential guide edges 22, 22 of an arcuate frame 20.20, and a gear 24 is formed on the outer periphery of the movable frame 23.
The structure is such that a pinion 25 that meshes with the shaft 25 is provided on a shaft 26 that is rotatably supported on the main frame 21. Therefore, when a handle 27 provided on the shaft 26 is rotated, the pinion 25 and the gear 24 that meshes with it are rotated. The movable frame 23 rotates about the center line C while sliding along the outer circumferential guide edge 22.22 of the arc-shaped frame 20.20.

The saw motor 3 is fixed to a bracket 30 erected on the surface movable frame 23, and in this case, it is fixed in the direction toward the center line C by fastening and fixing it with a bolt 31 through a long hole (not shown). The position can be adjusted.

The circular saw 4 is attached directly to the motor 1lill 132 of the saw motor 3 in parallel with the moving direction (lateral direction) of the trolley 11, with its lower end wrapping around the center line C, and therefore , this circular saw 4 has the movable frame 2
3, its direction can be varied around the center line C.

Next, a sawing method using the sawmilling apparatus A of this embodiment will be explained.

First, a log of cedar, pine, or the like is split in half along the longitudinal direction to create a half-split log 5.

Next, the half-split log 5 is set on the log side machine stand 1.
In this case, the cut surface 50 of the half-split log 5 is placed face down on the base 12 of the trolley 11, each fixing claw 15 is bitten into the half-split log 5 by the cap screw 14, and then each head block 13 is Advance vertically to remove the pith 5 of the half-split log 5
1- is fixed at a position where it coincides with the center line C.

Next, move the movable frame 23 of the side machine stand 2 to the arc-shaped frame 20.
The circular saw 4 was rotated downward while sliding on the outer peripheral guide 922.22 of 20, and the circular saw 4 was set so that the direction of the circular saw 4 was along the radial line a, and the circular saw 4 was rotated by the saw motor 3. If the cart 11 of the log side machine 1 is moved laterally in this state, the circular saw 4 cuts the halved log 5 from the line a, and as shown in FIG. is sawn.

From then on, by rotating the movable frame 23 upward and sequentially setting the direction of the circular saw 4 along the lines s, c, d, etc., the direction of the circumference of the half-split log 5 A large number of slope boards 6 can be sawn from this half-split log 5 while maintaining the board thickness, and each slope board 6 sawn in this way has a cut surface that passes through the pith part 51 of the log. Since it is in the radial direction, it becomes a regular straight-grained slope board with growth rings appearing parallel to the cut surface.

Note that when knots appear on the surface of wood, the commercial value of the wood is significantly reduced, so the knots are removed before subsequent cutting.

One embodiment of the present invention has been described above with reference to the drawings.

The specific configuration of the present invention is not limited to the above-described embodiments, and even if there are design changes that do not depart from the gist of the invention, they are included within the technical scope of the present invention.

For example, in the embodiment, the log side machine is moved laterally, but the section side machine may be moved.

Further, the cart may be moved by hand or may be moved by a driving means.

In addition, although gears and pinions are used in the embodiment as a means for rotating the movable frame to change the direction of the circular saw, the present invention is not limited to this, and other drive means may be used. The amount can be arbitrarily set depending on the thickness of the slope board to be sawn.

Note that the slope board sawn by the sawmilling device of the present invention has its pith and epidermis removed, and can be used as a siding board or parting edge of a wooden house.
It can be used in various parts as other building materials.

(Effects of the Invention) As explained above, in the sawmilling device of the present invention, the direction of the circular saw can be changed around the pith of the log by rotating the movable frame, so it is possible to cut the log in half. It is possible to cut the raw wood along the length along a radial line centered on the pith while increasing the thickness in the circumferential direction of the raw wood.This allows you to create sloped boards with straight grain on both sides. The effect is that lumber can be sawn from half-split logs at a high yield.

[Brief explanation of drawings]

Fig. 1 is a side view showing a sawmilling device according to an embodiment of the present invention, Fig. 2 is a plan view of the device, Fig. 3 is a perspective view of a slope plate sawn by the device, and Fig. 4 is an explanation of the prior art. It is a diagram. A: Sawmill equipment 1: Log side machine stand 2: Section side machine stand 3: Saw motor 4: Circular saw 21: Main frame 23: Movable frame

Claims (1)

[Scope of Claims] 1) A log side machine stand that fixes the half-split log obtained by splitting the log into two along the length direction, and a saw side machine stand that attaches a circular saw to the half-split log. The saw side machine base is formed of a main frame and a movable frame to which a saw motor is attached, and the saw motor is provided so as to be movable in the length direction, and the saw side machine base is configured to be parallel to the halved log. A sawmilling device, characterized in that a circular saw is attached to the main frame, and the movable frame is rotatably provided on the main frame so that the direction of the circular saw can be changed around the pith of the log.