VILJANEN, Reijo (Bergslagsvägen 127 A 7, Kolsva, S-730 30, SE)
| CLAIMS A measuring and data transfer control system of blade position in a^saw device, and the control system connected to sawing of wood and in the device a piece of log (5) is sawn off using a blade or several pieces (5.1), (5.2), (5,3) side by side or one after another into phase shift between themselves on sawing by means of fitted blades (1);(2) and as sawing means band saws or circular saws are used and in connection of which blades there are sensors (6) measuring the position of blades and power means, (7),(8) as magnets or mechanical control means, characterized in that in a situation of sawing the portion of sawing blade (1);(2);(13) distance position in regard to counter part (12) or in regard to the other sawing line of blade (1);(2) is measured, for instance, by means of distance sensor (6) and at the same time, for the log a length coordinate system is formed to indicate its, distance position, where per each coordination value a corresponding measured thickness data is fitted, whereby the real thickness of the removed sawn piece is continuously measurable, and data of thickness transmittable to the unit (9) which is controlling the system. 2. A control system according to claim 1 characterized in that, the distance position of blade is measured through the log (5). 3. A control system according to claim 1 characterized in that, the distance position of blade is measured immediately from the blade portion beside the log (5). 4. A control system according to claim 1 characterized in that, if in the sawing line of former blade a deviation causing variation of thickness from the intended sawing line is observed the latest blade of blades one after the other is steered off the intended sawing line in order to compensate said deviation, and to achieve intended thickness for sawn piece (5.1);(5.2,); (5.3). 5. A control system according to claim 1 characterized in that, crossing of error limit of measurement result is fitted to refuse the sawn piece. 6. A control system according to claim 1 characterized in that, the control system has an unit, which on basis of measurement results classifies and assorts the produced sawn pieces. 7. A control system according to claim 1 characterized in that, the steering system, the achievement of sawn pieces, and reporting of them, are connected to remote follow-up, for instance by means of a computer in the local network or through internet or telephone network. 8. A control system according to claim 1 characterized in that, wood is sawn at the same time by means of several saws one after another and each produced sawn piece (5.1);(5.2); (5.3) is under control of the system moved to next sawing. 9. A control system according to claim 1 characterized in that, wood is sawn on a sawing line comprising several sawing units one after another and each produced sawn piece (5.1);(5.2);(5.3) is under control of the system moved to next sawing. |
TRANSFER AND ADJUSTMENT OF POSITION OF A SAW BLADE
This invention is related to a measuring and data transfer control system of a blade position in a saw device, the system connected to sawing of wood, and where from wood a piece is sawn off using a blade or several sawn pieces side by side or one after another into phase shift by sawing taking place by means of blades fitted between themselves and as sawing means band saws or circular saws are used and in connection of which blades there are sensors measuring the position of blades, and power means, such as magnets or mechanical control means controlling the position of the blades.
Previously known as measurement of checking the pieces sawn off the wood, is for instance, mechanical measuring of sawn piece by so called calliper principle, measuring of shape by photographing, further, checking the measurements of it by means of light or laser beams.
The weakness of these measuring is that they are done only when the sawn piece has been ready-sawn and removed from the saw device. Accordingly, the sawn piece has to travel some time on the conveyor, before its quality has been clarified and it can be steered to the spot wanted for continuous sawing, hi addition, known ways of sawing are inaccurate, slow, and essentially lengthening the sawing lines. Further, in known systems it is not possible to have impact on the course of sawing so that the thickness fault observed, in the achieved sawn piece, could be compensated with the blade behind, while the sawn piece is still under sawing.
Further known, among others, from publications US 5819613 and 5722474 are ways of measuring of a log to be sawn, where, the shapes of log are measured before it is steered to the blade to get sawn. The blade is steered according to data of log achieved beforehand. However, the disadvantage by measuring is that from an actual measuring situation no data is achieved, as a matter of fact, how thick the piece was removed by sawing. Presented in publication EP 0535296 is cutting of thin discs from a pole so that the position of the cutting blade is measured and by means of the control system kept on the intended line. However, the position of blade is not measured in regard to the position cutting counter part or in regard to the position of another blade cutting beside. It is measured in regard to the position of the measuring sensor. The system does not give reliable data of the thickness of the final removed disc.
By means of the control system according to the invention the problems of faulty thickness appearing on sawing are solved, and the achievement of a first rate amount of sawn pieces improved. The control system according to the invention is characterised in that in a situation of sawing the distance position of the blade portion is measured in regard to the counter part or, for instance, in regard to the sawing line of another blade by means of the distance sensor, and at the same time for the log length coordinates indicating its length station is formed, where per each coordination value measured corresponding data is adapted, whereby the real thickness of the removed sawn piece is continuously measurable and thickness data transferable to a unit controlling the system.
The advantage of the control system according to the invention is that the achieved sawn piece is measured already at the same time a s it is sawn. Accordingly it can at once be transferred to continuous sawing, according to its quality, or to refuse. Its thickness is known exactly in each of its length coordination positions. The follow-up of real time achievement is possible on the spot and by means of remote data transfer. The sawing can be watched, for instance, from the monitor, and the display of thickness is in real time all the time on the monitor. By means of the consecutive sawing arrangement it is possible by means of the control of latter blade in order to compensate possible winding of the former blade in order to keep the thickness of the sawn piece constant.
In the following the invention is disclosed with reference to the enclosed drawing , where: Figure 1 shows sawing of wood according to the invention viewed diagonally means of two saws, one after another.
Figure 2 shows continuous sawing of the piece against the counter by means of one saw device.
hi figure 1 sawing of wood 5 is presented with two bade saws one after another, which are among themselves in phase shift of distance a. In the saws there i the saws blades 1 and 2, idler wheels 3 of bade steels high up and wheels 4 down . blades 1 and 2 are controlled by magnetic means 7 from the wood 5 upside and by means 8 from the lower side. By means of distance measuring means 6 the position of blades 1 and 2 inside wood 5 is measured. When circular log 5 runs only on the lower car (not shown) it is not pressed against the side control, but the log runs freely fixed to the lower car. In this case the position of blade 2 is also measured inside log 5 by means of sensor 6, but yet no value its thickness is achievable. When also the position of the other latter blade 1 is measured inside the wood, as comparison, it is possible in regard to the position of blade 2, to achieve the thickness of sawn piece 5.1 in the middle. These Measuring data are taken direct to the control and data collecting unit 9 .When wood 5 arrives at first contact to blade 2 the coordinate formation of wood length gets started, whereby the distance station data of both blades 1 and 2 can by means of cable 11 be connected with corresponding length coordinate of the wood. It is possible in real time to send from unit 9 sawing data, for instance, by means of the near net cable 11 computer 10 or over internet for remote follow-up to computer or to the telephone net work
It is possible in the sawing of figure 1, by means of blade 2 running behind, to correct the windings caused by possible deviations of blade 2 in controlling blade 1 by means of magnetic means of magnetic devices 7 and 8, so that the thickness of sawn piece 5.1 in the middle remains constant. The thickness of utmost sawn pieces 5.2 and 5.3 does not care and they are not measured now. For blades 1 and 2, for instance already a remote distance a of 200 mm is enough in the direction o the wood motion, so that that compensation could be done.
In figure 2 continuous sawing of sawn piece 5.1 against counter 12 is presented sawn piece 5.4 that arises is to its thickness that what it becomes. Then the data of one distance measuring sensor 6 is sufficient for accurate measuring of a new sawn piece removed against counter 12. Also in this connection of blade 13 magnetic or mechanical means 7 and 8 can be used for sideways control of bade, by means of which the blade is controlled as needed, so that the thickness sawn piece 5.1 remains constant. With greater logs 5 and sawn pieces in question more distance sensors 6 can be placed one on top of another, whereby data of thickness is achieved, for instance from the upper and lower of the sawn piece and from its central.
In some cases the position of the blade must not be measured through the log, but, it is enough that the position of the blade is measured from the blade portion visible on both sides tensed, so that it does not any more turn inside the log. For instance, the position of blade can be measured distance gauge with a laser-distance gauge distance gauge even from an oblique angle in regard to the blade level.
hi a case wood is sawn with one blade without pressing it against the counter. This comes into question by the first sawing of circular log. Even in this sawing the position of blade is measured across the whole distance of sawing. If in some spot the blade has turned off the in tended line, it is observed by means of the sensors and verified as deviation from the intended line aroused on sawing.
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