JPH0747501A - Method and equipment for dividing scrap - Google Patents

Abstract

PURPOSE: To improve classifying accuracy of a scrap by a constitution wherein a shoot for the scrap is fitted in the rear of a saw in the carrying direction of a lumber and the shoot is made open when the saw is separated from a cutting position. CONSTITUTION: A trimming saw has a circular saw 1 and a plurality of feeding rollers 4 and guide pulleys 6 and 7 for a conveyer belt are movably fitted by means of a hydraulic cylinder 13 in the rear of the circular saw 1. In addition, the trimming saw is provided with a supporting roller 10 positioned in the rear of the circular saw 1 and a shoot 12 for a scrap 11 of a lumber is arranged successively to this supporting roller 10. In addition, when the scrap 11 is cut off by means of the circular saw 1 and the circular saw 1 is separated from a cutting position, the guide pulleys 6 and 7 are moved in the carrying direction by actuating the hydraulic cylinder 13 to open the shoot 12 and the lumber 11 is advanced simultaneously by means of the feeding rollers 4 and the scrap 11 is discharged into the shoot 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sawing machine, and more particularly to a method and apparatus for separating scrap cut out from a trimming saw.

[0002]

2. Description of the Related Art Plates and other timber are cut into pieces of timber and scraps of a predetermined size by a trimming saw. The cutting of the timber is performed after the dimensions are measured based on the defects and quality marks of the timber and evaluated by a so-called optimization computer. Usually, the timber pieces and scraps thus formed are then sorted on a conveyor belt equipped with ejectors. As a means for separating scrap,
A method is known in which a second conveyor belt is arranged behind a first conveyor belt arranged immediately behind the trimming saw, and a gap is formed between the two conveyor belts. In this case, scraps that are shorter than the width of the gap between the conveyor belts are separated by gravity as they leave the first conveyor belt. Generally, scraps up to 80 mm in length are sorted in the gaps between conveyor belts. The accuracy of the sorting in this method depends on the length of the scrap and the width of the gap, and also on the speed of movement of the conveyor belt and the cross-sectional area of the timber. Further, a method of separating a long scrap by a scrap ejector or a blow nozzle is also known. Further, a method is known in which the trimming saw is tilted by about 30 ° and the scrap is slid sideways behind the circular saw.

[0003]

In the conventional method and apparatus for separating scrap, only 95 to 98% of the scrap is separated, and the remaining scrap is a passage for receiving the separated pieces of timber of a predetermined size. It has the drawback of being mixed inside. Scrap mixed into timber pieces of a given size causes damage, so such scrap must be removed by hand. Therefore, an object of the present invention is to improve scrap sorting accuracy.

[0004]

A closable chute for scraping is attached to the rear of the saw along the direction of transport of timber, and the chute is opened by moving the saw away from the cutting position. In the saw machine, a supply roller is provided just behind the saw along the direction of the timber transportation, and a guide pulley is movably mounted in the direction of the timber transportation. The main feature of the present invention, which is not found in the conventional method and apparatus for separating scrap, is that the scrap has a conveying speed of almost zero immediately after cutting, and the scrap is at this point (that is, the conveyor device). Immediately after becoming stationary during the cutting step), the sheet is conveyed at a low speed, and no noticeable delay occurs in the conveying step even for a short time. Therefore, as compared with the case where scrap is separated from the moving conveyor belt, the scrap separation capacity is extremely high. In this case, there is a risk that scrap will be conveyed by the next conveyor belt.
After the scrap is cut, an opening is formed immediately behind the last feed roller of the trimming saw along the transport direction of the timber piece, and at the same time, the timber piece is transported. The formation of openings and the transportation of timber are controlled by signals from the computer. It should be noted that this signal is formed on the basis of a short piece of timber, and is formed when the cutting of the piece of timber is completed. After the scrap passes through the opening, another signal closes the opening. In addition,
The formation of these signals is done in a known manner. The device for performing these steps has a closable chute. This chute is arranged just behind the last supply roller, which is arranged behind the saw along the direction of transport of the timber pieces. The supply roller is attached in a fixed state along the transport direction. In the preferred embodiment, the chute is configured to be closed by a conveyor belt. The length of the conveyor belt can be changed by a guide pulley attached so as to be movable in the carrying direction. The chute may be fitted with a blower or compressed air generator. By doing so, the scrap can be dropped more efficiently than when the scrap is dropped only by the action of gravity. The contents of the present invention will be fully apparent from the following description of the embodiments based on the drawings.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. The trimming saw has a circular saw 1 and supply rollers 2, 3, 4. A conveyor belt 5 is also attached to the trimming saw. Supply rollers 2, 3, 4
Is mounted on a fixed bearing (not shown).
The guide pulleys 6 and 7 of the conveyor belt 5 are attached so as to be movable in the direction in which timber is conveyed (the direction of the arrow in the figure). The movable distance of the guide pulleys 6 and 7 is about 200 mm
Is. The trimming saw has supporting rollers 8, 9 and 10 for supporting the timber 11 being conveyed. These support rollers 8, 9 and 10 are attached to fixed bearings. A chute 1 for scraping timber is provided on a supporting roller 10 located behind the circular saw 1 along the conveying direction of the timber and on a supply roller 4 located above the supporting roller 10.
2 is attached. A hydraulic cylinder 13 for moving these guide pulleys 6 and 7 is connected. The hydraulic cylinder 13 includes a well-known control unit (not shown). In addition, these guide pulleys 6,
7 can also be moved pneumatically or electrically.
As long as the trimming saw cuts out a piece of timber of a predetermined size to be further processed, the guide pulley 6 is a support roller 10
It is located just behind. At this time, the chute 12 is almost covered with the conveyor belt 5.

As soon as the scrap 14 is cut off by the trimming saw and the circular saw 1 is moved away from the cutting position, a signal is generated by a computer (not shown). The hydraulic cylinder 13 is controlled by this signal, the guide pulleys 6 and 7 are moved in the transport direction, and the chute 12 is moved.
Is released. At the same time, the supply rollers 2, 3, 4 are driven by this signal, and the timber 11 is further conveyed. As a result, the scrap 14 is dropped into the chute 12. After that, the hydraulic cylinder 13 is further controlled by another signal, and the guide pulleys 6 and 7 are moved in the direction opposite to the direction in which the timber is conveyed. As a result, the guide pulley 6 is again arranged immediately behind the support roller 10, and the chute 12 is again covered with the conveyor belt 5. In this state, the cut timber pieces having a predetermined size can be conveyed to the conveyor belt 5 as needed.

The above-described embodiments are merely examples for explaining the content of the invention, and do not limit the scope of the invention. Therefore, the above embodiment can be modified in any way without departing from the scope of the invention which is limited by the claims.

[Brief description of drawings]

FIG. 1 is a side view of a trimming saw according to the present invention.

FIG. 2 is a side view similar to FIG. 1 with the conveyor belt moved to another position.

[Explanation of symbols]

 2, 3, 4 Supply roller 6, 7 Guide pulley 12 Chute

Claims (5)

[Claims] 1. A saw machine configured to mount a closable scrap chute behind the saw along the direction of timber transport and to open the chute by moving the saw away from the cutting position. A method for separating scraps to be cut out, the method comprising a step of opening the chute and carrying the timber further forward. 2. The opening of the chute and the transportation of timber forward are controlled by a signal from a computer, the chute is closed by another signal after the scrap has passed through the chute, and the chute is opened. 2. The method according to claim 1, wherein the signals involved are formed on the basis of a short piece of timber and are arranged to be formed when the cutting of the piece of timber is terminated. 3. An apparatus for carrying out the method according to claim 1 or 2, wherein a supply roller is provided immediately behind the saw along the direction of transport of the timber and the direction of transport of the timber. A device in which a guide pulley is attached so as to be movable in that direction. 4. A device according to claim 3, wherein the chute (12) is fitted with a blower or a compressed air generator. 5. The apparatus according to claim 3, wherein one or a plurality of supply rollers are fixedly mounted along the conveying direction of the timber.