FI68548B - KAPSAOG FOER KAPNING AV SIDOBRAEDER FRAON STAOCKAR - Google Patents

Description

68548

CUTTING SAW FOR CUTTING LOG SIDE BOARDS

The invention relates to a cutting saw for cutting the side boards of continuously transported logs before separating them from the main product, which saw has a log feeder 5 and at least one cutting saw unit which can be moved longitudinally at the conveying speed of the logs.

In the cutting separation of logs into main goods and side-10 planks, the aim is to make the best possible use of wood, ie the cross-section of the log is divided so as to obtain the largest possible volume of processed timber products on all sides such as planks, planks and square timber.

15 Even very evenly grown tree trunks are not exactly cylindrical, but are slightly conical due to their natural taper. In general, tree trunks are also more or less curved. As a result, the side goods include, on the one hand, sideboards with a complete rectangular cross-section and, on the other hand, also surface boards.

The side boards must therefore be cut shorter than the main product. In a known method (DE application publication 2 750 712), this is done by clogging with the following cutting saws, which cut the side boards after they have been separated from the main product by sawing. In order to prevent side boards separated from the main product from pressing onto the main product during cutting sawing, so that cutting sawing damages the surface of the main product, the known method comprises a slit wedge placed in the sawing gap between

The necessary slit wedges to be placed between the side boards and the main product, which are placed in a movable cutting machine and hold the side boards during the cutting operation, make the structure considerably complex. The friction in the cracks prevents the cutting device from moving rapidly with respect to the log, so that on the one hand the speed of the log is limited and on the other hand there is not enough time to perform several cutting cuts. However, it would be desirable to perform several sawings when the part cut off as a sideboard scrap or surface board is relatively long and should therefore still be cut one or more times, e.g. for a simple subsequent separation of the scrap and utility board.

In order to avoid these difficulties, it has been proposed (DE patent application P 30 20 321.5) to perform cutting saws before sawing separating the sideboards, i.e. when 15 sideboards have not yet been separated from the main product. In this case, no special guidance or clamping of the side boards is required, and the cutting depth of the cutting saws can be kept very precise, so that damage to the surface of the main product due to the cutting saws is avoided.

20 In order to carry out this method, a device such as that shown in the proposed guide has cutting saw units located on both sides of the log feeder, which are guided perpendicularly on the stands. The stands are placed on 25 slides which move in the direction of transport of the logs.

In this case, two transfer actuators are required for the movement performed by the cutting saw units during the cutting saw, which move the cutting saw units simultaneously against two mutually perpendicular guides. 30 Due to the considerable complexity of the control and structures required, the aim is to simplify the equipment in these respects. The speed of movement of the cutting saw units must be adapted to the working speed of the following processing equipment. Therefore, relatively high speeds are required for the travel of the cutting saw units, with high deceleration and acceleration forces due to the often necessary changes in direction of movement, which are higher the higher the masses to be decelerated or accelerated. Also due to this, the structures of the moving parts are kept to a minimum.

The object of the invention is thus to simplify the control devices and structures required for the transfer movement in a cutting saw of the type shown in the guide.

According to the invention, this object is solved in such a way that the control of the cutting saw unit is inclined in the direction of transport of the logs or in the opposite direction to it and is only displaceable with respect to the direction of transport.

When the cutting saw unit moves along the inclined guide, both a movement component in the direction of transport of the logs and a perpendicular movement component are obtained. The movement component in the direction of transport of the logs moves the cutter-saw units synchronously with the logs, i.e. no relative movement is formed between the cutting saw unit and the log in the transport direction of the log. The perpendicular motion component represents the feed motion of the cutting saw. Namely, both motion components are obtained in a single direction by means of movement along 20 inclined guides.

To return the cutting saw unit to the home position after cutting, the cutting saw unit is moved transversely to the conveying direction of the logs so that the cutting saw unit is detached from the side board during the return movement along the inclined guide.

The longest path in this movement, at the turning points of which even the greatest decelerations and accelerations occur, then travels only a relatively light cutting saw unit, so the deceleration and acceleration forces present are small. In contrast, substantially larger and heavier parts, namely the control members of the cutting saw unit, move only a very short distance, which is only slightly longer than the thickness of the side board 35, in contrast to the previously proposed device mentioned above. Due to this, only very small acceleration and deceleration forces occur.

Since the movement of the cutting saw units takes place only in 68548 two directions, namely along inclined guides and transversely to the conveying direction, the guide tracks and the like are relatively simple in structure.

In a particularly preferred embodiment of the idea of the invention, it is provided that the control of the cutting saw unit consists of two parallel rotary guides attached to a bearing frame which moves to a fixed horizontal circular guide relative to the two frames. In addition to the structural simplicity, this embodiment has the advantage of a small space requirement, so that the device can also be built afterwards in existing plants.

It has proved particularly advantageous to carry out the use of the height movement of the cutting saw unit and the use of the transverse movement in each case with a cylinder driven by a pressure medium, most preferably a cylinder operated by a pressurized oil. In particular, for the actuators of the height movement of the circular saw unit, the advantage of this type of operation, low weight with high efficiency, is particularly important because it keeps the moving masses 20 small.

The invention will be explained in connection with the exemplary embodiment shown in the following drawing. In the drawing:

Figure 1 shows a side board cutting saw as a side view, and

25 Figure 2 shows a crosscut saw of the arrow II in Figure 1

viewed from the direction.

The function of the cutting saw shown in the drawing is to provide cutting cuts 1 'perpendicular to the logs 1 edged on four sides across the side boards 1' still attached to the main product. As can be seen from the sectional view of Figure 2, the four corners of the log are most preferably already milled to chamfer the longitudinal edges of the 1 ′ ′ side panels to be separated at right angles. The logs 1 are conveyed by a feeder, of which only the second support rail 2 is shown in Fig. 2, and are fed to a device which divides the logs from all sides into processed wood spare products such as planks, planks, quadrangular 5 68548 timber, etc. circular saws, band saws or - as in Figure 1 - superimposed circular saws **.

Especially when using double circular saws **, a very high working speed and thus also a high transport speed of the logs can be achieved. Therefore, very little time is available to perform the cutting cuts 1 ', especially when the cutting cuts have to be performed in quick succession.

Figures 1 and 2 show only a cutting saw located on one side of the log 1. It is self-evident that a correspondingly implemented cutting saw is placed on the opposite side.

The cutting saw has a cutting saw unit 3, which includes a sawing motor which drives a circular saw H with a horizontal axis of rotation. The cutting saw unit 3 can move along two rotary guides 6 inclined in the opposite direction to the transport direction of the logs 1 (arrow 5 in Fig. 1) between the upper and lower positions. The drive required for this consists of a cylinder 7 driven by a pressurized oil, the piston rod 8 of which is connected to a cut-off unit 3.

Both rotary guides 6 are fixed to a frame 9 which also supports a cylinder 7. The frame 9 is mounted 25 horizontally displaceably on two rotary guides 10 transverse to the conveying direction of the logs 1. The horizontal movement of the frame is performed by a pressurized cylinder 11 fixed to the machine body 12 connected to frame 9.

The trajectory is shown in Fig. 2. The cylinder 7 rapidly moves the cutting saw unit 3 downwards from the upper starting position shown in Fig. 2 along the inclined guides 6. The circular saw * 4 then performs the cutting saw 1 '. The horizontal movement component 35 of the cutting saw unit 3 corresponds to the transport movement of the log 1.

After the cutting saw unit 3 has performed the cutting saw and the circular saw * 4 from contact with the sideboard 1 "68548 (shown in broken lines in Fig. 2), the cylinder 11 pulls the frame 9 to the position shown in dotted lines in Fig. 2. The distance traveled corresponds to at least the thickness of the sideboard 1". Finally, the cutting saw unit 3 lights up again. The Kos-5 ka circular saw * + is then released from contact with the side board 1 ”, the continuous transport of the log 1 does not interfere with the return movement of the cutting saw. In the upper position of the cutting saw unit 3, the cylinder 11 moves the frame 9 forward again and the cutting saw unit 3 can start the next cutting-10 cutting again.

In contrast to the embodiment shown, in which the rotary guides 6 are inclined in the opposite direction to the conveying direction 5 of the logs 1 and the cutting is performed as the cutting saw unit 3 moves downwards, a device can also be selected in which the guides 6 are inclined in the conveying direction.

Il

Claims (3)

7 68548 A cutting saw for cutting the side boards (1 ") of continuously transported logs (1) before separating them from the main goods, the saw having a log feeder and at least one cutting cutter unit (3) longitudinally displaced at the conveying speed of the logs (1) , which can move along the guide (6) in the height direction, characterized in that the guide (6) of the cutting saw unit (3) is inclined to the conveying direction (5) of the logs (1) or in the opposite direction and only transverse to the conveying direction (5). Cutting saw according to Claim 1, characterized in that the control of the cutting saw unit (3) consists of two parallel rotary guides (6) which are fastened to a bearing frame (9) which moves to a horizontal rotary guide (10) fixed relative to the two frames. Reciprocating saw according to Claim 1 or 2, characterized in that the operation of the height movement and the transverse movement of the cutting saw unit (3) are in each case carried out by a cylinder (7 and 11) driven by a pressure medium, preferably by a pressurized oil.