JPH0338080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention, when cutting a long piece of wood into wood pieces of various sizes, cuts the pieces of wood into pieces of the various sizes from a good piece of wood from which defective parts such as joints and cracks have been removed. The present invention relates to a wood cutting device that can cut pieces of wood most effectively and with priority given to desired cutting dimensions.

PRIOR TECHNOLOGY When it comes to cutting wood pieces of various lengths from a long piece of wood depending on the purpose, conventional techniques such as a.
It is customary to cut 20 pieces of wood of size B, 40 pieces of wood of size C, and so on, according to the schedule for the day of work. However, not all of the long pieces of wood can be cut into useful wood pieces, and since there are defective parts such as joints and cracks here and there, it is necessary to cut the wood by removing the defective parts.

Problems to be Solved by the Invention As described above, if a long piece of wood from which a piece of wood of a required size is to be cut has defective parts as described above, and if wood is to be cut only from the part from which the defective part has been removed, it is inevitable that This results in a large amount of waste material being produced, which reduces the yield. To give a simple example, if 3 pieces of size A and 4 pieces of size B are effectively cut from a piece of wood of a predetermined length consisting only of good wood parts with no defects, then the pieces of wood of the same size length There are two defects such as joints and cracks,
Assuming that this part cannot be used as a piece of wood, excluding the defective part mentioned above, the only pieces of wood that can be effectively harvested are one piece of wood of size A, three pieces of wood of size B, and the remaining scraps. Although it is a good material part,
There are cases where it is necessary to discard the product because it does not meet the dimensions of either a or b. Therefore, in order to avoid wasteful scraps as much as possible, a skilled person roughly measures a,
b, c... Although wood pieces of various sizes are being cut effectively, there is a natural limit to cutting a large amount of wood in a limited amount of time, and this is the cause of a decrease in yield. It was hot.

Purpose of the Invention The present invention has been proposed in order to effectively solve the above-mentioned drawbacks inherent in conventional wood removal work, and is to remove defective parts such as joints and cracks from long pieces of wood. When harvesting wood from other parts of the wood, the computer stores a plurality of lengths (for example, 30 types) of each piece of wood, and uses the stored lengths to determine the required size according to the work schedule for the day. The purpose is to improve the yield and work efficiency by assigning priorities and cutting wood pieces of a size corresponding to the priorities from the good wood portion most effectively and without waste.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the intended purpose, the present invention provides a long wood cutting device for cutting long wood into pieces of various lengths, which includes: A belt conveyor whose longitudinal conveyance surface is slightly inclined toward the front side, and which conveys the long timber by bringing the side surface of the long timber into contact with its own weight against a reference frame extending downward along the conveyance surface; a wood sensor that is installed in the middle of the conveyance path of the belt conveyor and detects the tip of the wood; and a length measurement device that is placed adjacent to the wood sensor downstream in the conveyance direction and that measures the length of the wood by coming into contact with the wood. a defect sensor that is arranged adjacently downstream of the length measuring roller in the conveyance direction and sequentially detects markings made on both sides of defective parts such as knots and cracks in the wood in the conveyance direction; and various pieces of wood to be removed. a computer unit in which dimensions, priorities, etc. are stored, and data from at least the length measuring roller and the defect sensor are input; It consists of a positioning unit that clamps the wood at a desired position, and a circular saw that is movable up and down downstream of the positioning unit and that moves up and cuts the wood according to a command from the computer unit, and the wood sensor detects the tip of the wood. When the arrival is detected, the length measuring roller starts measuring the length of the wood, and when the defect sensor detects the first marking, the length measurement is finished, the data is input to the computer unit, and the defect sensor starts measuring the length of the wood. detects the next marking, restarts the length measurement by the length measuring roller, and ends the length measurement by detecting the first marking indicating another defective part,
The method is characterized in that the operation of inputting the data into the computer unit is repeated, and the positioning unit clamps the wood according to a command from the computer unit, and the circular saw moves up to cut off the good wood portion. shall be.

Embodiments Next, a preferred embodiment of the long wood cutting device according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front view of a wood removal device according to a preferred embodiment of the present invention, and FIG. 2 is a plan view of the device shown in FIG. In the figure, reference numeral 10 denotes a belt conveyor for transporting wood, and this conveyor 10 preferably has its transport surface tilted at a slight angle toward the front, so that the longitudinal side surface of the wood on the reference frame 12 is under its own weight. The structure is such that the indexing of the reference plane is automatically performed when the two contacts come into contact with each other.

In the middle of the conveyor 10, there is a phototube 14 for detecting the arrival of the leading end of the wood, and a phototube 1 for detecting markings (described later) indicating defective parts of the wood.
5 are arranged at a predetermined distance apart in that order. Further, the photoelectric detection section includes the conveyor 1
A roller 16 is provided that contacts the wood being conveyed on the surface of the roller 16, forcibly transports the wood, and measures the length of the wood. This roller 16 is rotationally driven by, for example, a servo motor, and the length measurement is performed by counting pulses transmitted from a rotary encoder attached to the servo motor.

At the end of the conveyor 10 there is a positioning unit 18.
is arranged to clamp the long pieces of wood that arrive on the conveyor 10 according to the required work instructions, and at the same time raise the circular saw 20 that is movable upward and downward at an appropriate timing to cut the wood. I'm starting to do it. Reference numeral 22 indicates a computer unit, which issues work instructions to cut the wood 26 according to various dimensions and lengths, and
Data necessary for carrying out the work is stored, such as the size and length of the wood pieces (30 different types), priorities, and the thickness of the circular saw. Furthermore, on the downstream side of the positioning unit 18, there is provided a material sorting device 24 for sorting wood pieces of various lengths according to size.

Embodiment Next, the actual use of the tree removal device configured as described above will be explained. As shown in FIG. 3, if a defective part 28 such as a joint or crack is found by inspecting the surface of a long piece of wood 26, two lines are drawn using a fluorescent marker on both sides of the part. Markings 30a and 30b are applied.
This marking work is performed manually by an operator on the upstream side of the conveyor 10, and only the wood that has been marked is supplied to the conveyor 10.

The wood 26 with the markings is conveyed on the conveyor 10, but at this time, the above-mentioned and fourth
As shown in the figure, since the conveyor conveyance surface is inclined at a predetermined angle toward the front side, the longitudinal side surfaces of the timbers 26 are securely brought into close contact with the reference frame 12 due to their own weight, and indexing of the reference surface is performed. It will be done. When the tip of the wood 26 passes through the location of the phototube 14 while being conveyed on the conveyor 10, it is detected that the wood has arrived at a fixed position, and the roller 16
A command is given to the servo motor that drives the servo motor, and length measurement begins. While the length is being measured by the rollers 16, the wood 26 is further conveyed on the conveyor 10, and the marking 30a, which is the first of the two markings indicating the defective part 28, is
When the phototube 15 detects this, one length measurement is completed. In other words, this measured length is a good material with no defects, and the length of this good material is input as data into the computer 22, and when it is cut by the circular saw 20 in the positioning unit 18 on the downstream side, it is Effective tree cutting is now being done (more on this later).

Since the wood 26 continues to be transported even after the first length measurement is completed, the second marking 30b indicating the defective portion 28 immediately arrives at the phototube 15. ,
This is detected. As a result, a command is given to the servo motor to start the next length measurement.
The servo motor starts measuring the length, and when the phototube 15 detects one of the two markings 30a indicating another defective portion 28 of the wood 26, the second measurement ends. As described above, due to the synergistic effect of the phototube and the marking indicating the defective portion, the length of the measured portion ends up being the length of the portion consisting only of good material without any defective portions. Therefore, it is only necessary to effectively cut pieces of wood of various lengths from the measured good wood portion according to the work schedule of the day.

That is, said effective tree removal is carried out with the aid of data input and stored in a positioning unit 18 and a computer unit 22 installed downstream of the conveyor 10. As a result of the length measurements, it is known that the wood 26 has a plurality of good wood parts that can be effectively cut as is, and all the measured length results are stored in the computer unit 22. Therefore, the computer unit 22 selects a combination of wood pieces of any length from the good quality wood portion according to the pre-stored various lengths of the wood pieces and the priority order input according to the work schedule of the day. It is calculated in real time whether the cutting should be done or not, and the calculation result is given to the circular saw 22 as a drive command.

As a result, the quality wood portion of the wood 26 arriving at the positioning unit 18 is cut into pieces of wood of various lengths in the most effective and waste-free form depending on the measured length. Also, in the next block (for example, the second length measurement part), wood pieces of various lengths are cut according to the measured length in priority order according to the work schedule of the day. be done.

Note that the wood pieces cut into various predetermined lengths are sent to the material sorting device 24, sent out in a direction perpendicular to the conveyance direction by fences 32 that arrive intermittently, and dropped at positions according to their respective lengths. and transported by a sorting conveyor 34.

Effects of the Invention As explained above, according to the long wood cutting device according to the present invention, when cutting wood pieces of various sizes from a long piece of wood, it is possible to cut wood pieces of various sizes from a long piece of wood by removing defective parts such as joints and cracks. It is possible to most effectively cut pieces of wood of various lengths according to the length of the good wood portion according to the priority set by the work schedule of the day, thereby reducing waste and significantly improving yield.

[Brief explanation of drawings]

FIG. 1 is a front view schematically showing a preferred embodiment of a long wood cutting device according to the present invention, FIG. 2 is a plan view of the device shown in FIG. 1, and FIG. FIG. 4, an explanatory diagram showing a state in which defective portions are indicated by marking, is a side view of the apparatus shown in FIG. 1, viewed from the left. 10...Belt conveyor, 12...Reference frame, 1
4...Wood sensor, 15...Defect sensor, 16...
... Length measuring roller, 18 ... Positioning unit, 20
... Circular saw, 22 ... Computer unit, 26
...Wood, 28...Defective part, 30a, 30b...
…marking.

Claims (1)

[Scope of Claims] 1. In a wood cutting device that cuts a long piece of wood into wood pieces of various lengths, the longitudinal conveying surface is slightly inclined toward the front, and the reference frame extends downward along the conveying surface. The side surface of the long piece of wood 26 is brought into contact with 12 by its own weight, and the piece of wood 26
a belt conveyor 10 that conveys the wood 26; a wood sensor 14 that is provided in the middle of the conveyance path of the belt conveyor 10 and detects the tip of the wood 26; A length measuring roller 16 that measures the length of the wood 26 by contacting the length measuring roller 16, which is arranged adjacently downstream of the length measuring roller 16 in the transport direction, and is located on both sides in the transport direction of defective parts 28 such as joints and cracks existing in the wood 26. Marking 3 on
A defect sensor 15 that sequentially detects 0a and 30b, and a defect sensor 15 that stores various dimensions and priorities of pieces of wood to be cut, and at least the length measuring roller 16.
and a computer unit 22 into which data from the defect sensor 15 is input, and a positioning unit 18 that is arranged in series downstream of the belt conveyor 10 in the conveying direction and clamps the wood 26 coming from the conveyor 10 at a predetermined position. A circular saw 20 is provided downstream of the positioning unit 18 so as to be movable up and down, and rises in response to a command from the computer unit 22 to cut the wood 26, and the wood sensor 14 detects the arrival of the tip of the wood 26. Then, the length measuring roller 16 starts measuring the length of the wood 26, and when the defect sensor 15 detects the first marking 30a, it ends the length measurement, inputs the data to the computer unit 22, and The defect sensor 15 detects the next marking 30b
When this is detected, the length measurement by the length measuring roller 16 is restarted, and the length measurement is terminated by the detection of the first marking 30a indicating another defective part, and the data is transferred to the computer unit 22.
The positioning unit 18 clamps the wood 26 in response to a command from the computer unit 22, and the circular saw 20 ascends to cut off the good wood. A device for removing long pieces of wood.