FI68549B - BAKAVSKILJARE VID EN RAMSAOG - Google Patents

Description

1 68549

Frame saw surface separator - Bakavskiljare vid en ramsäg

The invention relates to a surface cutter for a frame saw, which is preferably arranged in a knife guide device and consists of surface knives arranged on either side of a track or log, the tip is knife-shaped and has adjusting means for adjusting the distance between the .

In sawmills, frame sawing machines are usually used. The log is first driven to the frame saw alone. In this case, the supports provide only one or more sideboards on both sides and an o surface. The plain is then driven 90 inverted into a splitter frame saw. Boards or the like are sawn here from the heart goods. Here, too, one or more sideboards and a surface are obtained from both sides.

After each frame saw, a knife guide device is arranged, which consists of two sturdy, relatively long guide plates, the mutual distance of which is adjustable to correspond to a mere or heart stack. The knife guide is positioned so that the tips of the knives come as close as possible to the saw blade, and at the same time the end of the log, so that the knives hit the saw slots more securely.

The function of the knife guide is: to separate the side boards and surfaces from the core material, to guide only during sawing, to retain the board only until the side boards and surfaces have come off.

It is known to arrange the device in connection with the knife guide device.

2,68549 which separates the surface from the side boards. The surface is chipped and the side boards are taken to an edging machine. Separation of the surface greatly facilitates the work of the edging, and is essential in automatic edging.

There are two basic types of surface separator. In the second, the separation is performed with round rotating knives attached to the rear racks. The knives can be adjusted sideways. The surfaces guided outside the knives fall into the abyss and the side boards continue to be edged on the conveyor.

If the rotating knife does not hit the gap between the surface and the sideboard directly, it is adapted to rise when lifted by the compressed air cylinder so that it does not break and so that no downtime occurs. The rotating knife can then be arranged to automatically retrieve the gap, whereby it tends to descend downwards by moving sideways at a certain pressure. Due to the cylinders, this arrangement requires a relatively large amount of space, which is why the rotating knives have to be arranged relatively far to the rear, i.e. considerably further back than the actual guide knives. As a result, the device often operates with poor reliability, and the knives search the surface along the entire length of the log or just without finding a gap. The device is also expensive and requires compressed air.

The second basic type consists of auxiliary knives, extraction wheels and separate heart goods and side board tracks. Auxiliary knives are mounted on the actual guide knives. The gap between the auxiliary and guide knives is adjusted according to the sawing board dimensions. Board blanks are usually pulled out with wheels that can be raised and lowered. The surface parts of the log are guided from outside the auxiliary knives to the surface shaft, the board blanks are guided to the edging. The auxiliary knives are pneumatically controlled and their compression pressure is adjustable. A pressure of 390 n 3 68549 440 kPa is usually used. If the pressure is exceeded, the knives will open and the indicator light on the saw blade will illuminate.

The disadvantages of this solution are its high cost and the need for compressed air. If the surface goes inside the knife and the knives open, the saw line is usually directed to a stop. Such downtime is expensive. In addition, these require other accessories, such as overhead wheels for advancing the sideboards.

The object of the invention is to provide an inexpensive, simple and reliable automatic surface separator device. According to the invention, this is achieved in that spring members or counterweights are arranged on the surface knives, the direction of force of which is directed to press the surface knives towards the guide plates against the limit setting of the adjusting device.

Other preferred embodiments of the invention will become apparent from the appended dependent claims.

In the device according to the invention, the pressing and adjustment of the surface knives is arranged by means of a simple device provided with a spring member or a counterweight. In addition, the tips of the surface knives are at the same level or slightly further back than the tips of the guide plates, so that the surface knives hit the sawing gap more securely when the distance between the log head and the surface knives is as short as possible. The knife device does not require overhead wheels for side boards. Below are only short Belt Conveyors that are powered by a roller track.

The surface knives must open so much that if the surface goes inside them, it can pass through and does not damage the machine or stop sawing. The surface may be very thick at the base of the log. This is also realized in the device according to the invention 4 68549, because the surface knives have an oblique upward shape, their attachment point being located substantially above the path of the timber or timber, and because the surface separator plates are adapted to open sufficiently. It has proved particularly advantageous to place the attachment point of the surface knives outside the vertical plane formed by the surface knives, whereby the surface knife opens with a small movement if the surface goes from inside the surface knife, whereby it also returns more quickly to its operating position.

Between the blades of a frame saw, the so-called a base disc or a piece of surface, which is usually easier to remove from the knife device side. In this case, the openness of the device according to the invention is an advantage.

The invention will now be described in more detail with reference to the accompanying figures, in which Figure 1 shows a side view of a side saw and a surface separator of a frame saw alone, and Figure 2 is a top view of the separator according to Figure 1.

Figures 1 and 2 show the side saw and surface separator of the frame saw. The side plate and surface separator of the manifold look basically the same. The figures show the body 10 of the knife guide device, to which the guide plates 4 of the knife guide device are adjustably fitted. The guide plates 4 are adjusted to correspond to the width alone. Thus, the tip 1 of the knife guide device separates the side board or boards only. From the setting screws 7 of the surface knives 5, the distance of the tip 2 of the surface knife 5 from the tip 1 of the knife guide can be adjusted so that the desired number of side boards can be accommodated between the surface knife 5 and the guide plate 4 of the knife guide. The locking screw 6 secures the setting. The side boards are further conveyed for bending, for example to an automatic bending machine by a side board conveyor 3.

it 5 68549

As automatic edging machines cannot handle the surfaces connected to the side boards, the surfaces must already be separated in connection with the knife guide. The surfaces are separated by means of surface knives 5, and taken for chipping. If the tip 2 of the surface knives does not penetrate the gap between the sideboards and the surface due to an incorrect position or for any other reason, in which case the surface travels with the sideboards, the surface knives 5 are arranged also at the end of the log, i.e. the base end. The solution according to the invention makes this possible, because the attachment point of the surface knives is located substantially higher than the trajectory of the log, and then the possible attachment axis is not an obstacle to the surface. The outward movement of the surface knives according to the invention is adapted to allow the thickest surfaces to travel from the inside.

The device according to the invention also has a setting locking screw 6, which locks the adjusted setting of the surface knives. In practice, this solution is more convenient than locking with a separate tool.

Claims (5)

68549 A frame saw surface separator, preferably arranged on a knife guide device (1, 4) and consisting of surface knives (5) arranged on either side of a path of a mere or log, the tip (1) of which is knife-shaped and has adjusting means (7) for surface knives (5). ) for adjusting the distance from the guide plate (1, 4) of the knife guide to the common thickness of the side boards to be separated and means (6) for locking the surface knives in this position, characterized in that the surface knives (5) are provided with spring members (9) or counterweights. 5) towards the guide plates (1, 4) against the limit setting of the control device. Surface separator according to Claim 1, characterized in that the surface knives (5) form an angle with the path of movement of the log, which angle in the operating position of the surface knife (5) is between 2 and 12, preferably between 0 and 8. Surface separator according to Claim 1 or 2, characterized in that the attachment point (8) of the surface knives (5) is located outside the vertical plane formed by the surface knife (5). Surface separator according to one of the preceding claims, characterized in that the attachment point (8) of the surface knives (5) is located substantially above the path of movement of the log and that the maximum opening of the surface knives (5) is dimensioned sufficiently to allow the thickest possible surfaces to pass through. Surface separator according to one of the preceding claims, characterized in that the spring force of the spring elements (9) is adjustable. it