FI71685B - ANORDNING FOER RIKTNING AV EN STOCK VID SAOGVERK - Google Patents

Description

\ · & ΤΆ ΓΒΊ (11) KUU1CLUTUSJULKA, SU 71685 1 'utläggningsskrift c .... Pi to .: Iti .myonnetty ®c ^^ J Pi tent racMcIit ZO ZZ 1007 (51) Kv.ik.4 / lnt.ci. 'B 27 B 31/06 FINLAND —FINLAND (21) Patent application - Patentansökning 773699 (22) Filing date - Anjökningsdag 08.12.77 (EN) (23) Starting date - Giltighetsdag 08.12.77 (41) Published public - Blivit offentiig 09.06.79

National Board of Patents and Registration of Finland Date of filing and monthly publication - 31.10.86

Patent and registration authorities '' Ansökan utlagd och utl.skriften publicerad (86) Kv. application - Int. ansökan (32) (33) (31) Privilege claimed — Begärd priority (71) A. Ahlström Osakeyhtiö, Noormarkku, FI; 1 + 8601 Karhula, Finland-Finland (F I) (72) Olli Heikinheimo, Helsinki, Finland-Finland (FI) (51+) Device for directing logs at a sawmill -Anordning för riktning av en stock vid sägverk

The invention relates to a log alignment device comprising a conveyor for feeding logs to a rotating device, rotating devices, means for examining log side profiles, calculating devices for determining the optimum orientation of logs, orientation brackets located on the saw line and orientable said transfer device comprising an axis about which the levers are arranged to rotate, as well as supports supported at their free ends, the transfer of the log taking place mainly by means of a circumferential movement performed by the supports.

Since the logs are intended to be cut so that there is a bend in only one plane, it is sufficient to rotate the log upwards or downwards to give a satisfactory yield of sawn timber. In this case, the block only has to be oriented horizontally. The trend in logs is currently a major problem at the sawmill. For example, according to the Swedish Forest Research Institute (STFI Meddelande Serie B Nr 260), more than half of all supports are sawn at least ^ 5 mm incorrectly compared to the optimum yield.

2 71685 This is of great economic importance, given that an 8 mm centering error causes a yield loss of about 5% for 8 "logs. Attempts have been made to reduce this by using a so-called log concentrator in sawmills, which is mainly intended for Due to the structure of the log concentrators, their benefit is greatest when the log is theoretically in the correct shape, but in practice the log shape is quite different from the theoretically error-free logs, in which case more optimal processing of the log is required to obtain the optimum yield. The device takes into account the actual errors of the log and determines the correct orientation taking into account the errors.

To achieve this, the device according to the invention is characterized by what is set forth in the characterizing part of claim 1.

In the following, the invention and the advantages obtained by it will be explained in detail with reference to the accompanying drawing.

Figure 1 schematically shows a device according to the invention seen from the direction of a sawing line.

According to Figure 1 of the drawing, the device according to the invention comprises a conveyor 1, which brings the logs one by one transversely onto the rotating rollers 2, 3. When the rollers rotate the log, the position of the log with the convex side facing upwards is determined by optical or mechanical means. The log is stopped in this position.

With the log convex side up, the side profiles of the log are examined vertically. This can be done with mechanical sensors 4 or optically, or by another suitable method. The profile information is entered into a computer that optimizes the correct position and orientation of the 3,71685 logs relative to the saw line. According to this orientation and position information, the orientation brackets 5 are oriented, which are located in the area of the saw line and are laterally displaceable. Each alignment support consists of two parts 5 'and 5 ". Each part is shaped so that the support points of the log come into exactly the same places as when the log rests on the rotating rollers 2, 3.

The log is transferred to the orientation brackets by a conveyor comprising levers 7 rotatable about the shaft 6. At the free ends of the levers 7, V-shaped brackets 8 are mounted, on which the log is lifted from above the rotation rollers 2, 3. The brackets 8 are connected by chains to the shaft 6, whereby they always remain in the same horizontal position despite the movement of the levers 7. The position of the shaft 6 can be moved horizontally. Its position and movement in the horizontal plane are controlled on the basis of the same data as the orientation brackets 5. At the moment when the brackets 8 take the log over the rollers 2, 3, the shaft 6 is exactly at the distance of the lever 7 from the center line of the rollers 2, 3. The purpose of this is for the brackets 8 to take the log with them in exactly the position when it rests on the rollers. If the distance was not correct, the log could rotate slightly in either direction.

The same applies to the lowering of the log on the support brackets. In this case, the shaft 6 is moved horizontally to such a position that the distance of the shaft 6 from the orientation brackets 5 is exactly the same as the length of the lever 7. In this case, the log remains in the support on the same points as when it is in the support of the rollers 2, 3. When the log has thus obtained exactly the correct direction and position with respect to the sawing line, the orientation brackets lower perpendicularly downwards and the log remains in the support of the feed conveyor 9, which feeds the log through the saw.

4,71685

The levers 7 either move the log directly laterally or at the same time move it forward as shown in the drawing. Forward movement reduces the distance between the logs with the saw conveyor feed conveyor. In practice, the angular speed of the levers must be kept relatively low in order for the log to maintain its position on the supports 8 without slipping.

In practice, it is also possible to consider a structure in which the movable shaft 6 is mechanically connected to the orientation brackets 5, so that by orienting the orientation brackets, the shaft 6 also moves to the correct position.

The invention has been described above with reference to only one embodiment thereof, but it is not intended to limit the invention to the example described above only. Many modifications are possible, while remaining within the scope of the inventive idea set forth in the following claims.

Claims (2)

5,71685 A log alignment device comprising a conveyor (1) for feeding logs to a rotating device, rotating devices (2, 3), means (4) for examining log side profiles, calculating devices for determining the optimal orientation of the logs, orienting brackets (5) located on the saw line and orientable according to the above optimum orientation, and a transfer device for transferring the log from the support of the rotating devices (2, 3) to the orientation brackets (5), the transfer device comprising an axis (6) about which the levers (7) and bearings (8) mounted at their free ends are rotated ), in which case the support of the log (6) is approximately parallel to the log and movable horizontally, so that when the log is removed from the support of the rotating devices (2, 3) the supports (8) take the log with them. in exactly the position in which it rests on the rotating devices (2, 3) and correspondingly lowers tu for directional brackets (5). Device according to Claim 1, characterized in that the shaft (6) is connected, preferably mechanically, to the orientation brackets (5).