DE2318820A1 - CAGE SAW MACHINE - Google Patents

Description

P ATETCT AN W A LTSB ÖRO TlEDTKE - BüHLING - KlNNE 2318820

TEL. (0811) 539653-58 TELEX: 524845 tlpat CABLE ADDRESS: Garmanlapätent Munich:

80 0 0 M ü ηchen 2 '

Bavariarlng 4

P.O. Box 202403 April 13, 1973

B 5372 / c - · --._

Kockum Industri Aktiebolag
Söderhamn, Sweden

Frame saw machine

The invention relates to a frame saw machine.

Framing saw machines are often used to produce sawn timber from logs or blocks. The frame saw machines currently used as a rule have a stand anchored on a foundation, a saw frame which can be moved up and down in the stand / in which a plurality
are clamped by parallel saw blades, and a drive with a crankshaft and a connecting rod articulated to the saw frame, which moves the saw frame up and down in the stand.

409845/0176

pie recent improvements made to gang saws of this type relate to individual parts such as saw blades, saw frames and bearings. The basic design, on the other hand, has remained unchanged, and the problems that result from it, "iaß the frame saw machine is a source of strong vibrations, are therefore still present in the frame saw machines now in use suggest, these machines therefore require careful anchoring of the stand. The vibrations are mainly based on the fact that the movements of the saw frame and the connecting rod generate large fluctuating forces that can be transferred to the stator via the crankshaft.

The invention is based on the object of reducing the vibrations in a gang saw machine of the specified type of the stand to decrease significantly.

JJur solving this problem is in the invention Frame saw the crankshaft rotatably mounted in a cradle supported by the stand, which is under the Action of the forces that the crankshaft during its Rotation exerts on them, relative to the stand back and forth is movable substantially in the horizontal direction at right angles to the axis of the crankshaft.

409843/0176

Since the crankshaft thus move freely relative to the stator in the horizontal direction transversely to its axis it becomes periodic during its rotation 'Perform translational movement at the frequency of the saw frame's back and forth movement. This translational movement has a compared to the saw frame movement Phase shift on, such that the crankshaft is is in its central position when the saw frame is in its end positions and that the crankshaft is in its end positions when the saw frame is in his Central position. Because the crankshaft is in Moving this way will greatly reduce the fluctuations caused by the crankshaft on the stand transmitted forces and consequently a significant reduction in the stator vibrations achieved.

Pie mobility of the cradle can be realized in different ways. For example you can use the cradle on straight and horizontal sliding guides at right angles to the crankshaft, and they move by means of the translational movements load counteracting springs against their central position. Instead of straight sliding guides, sliding guides can also be provided which are curved in this way in the vertical direction are that the cradle and the crankshaft with increasing distance from the central position more and more relative to the stand be raised, causing the translational movement through

409843/0176

counteracted the weight of the cradle and the crankshaft will.

However, it is preferable for the cradle to swing on the stator via pendulum links on both sides of the crankshaft is hung. Preferably the pendulum links are parallel or essentially parallel to each other. The cradle can also carry the drive motor of the crankshaft.

A frame saw machine designed according to the invention is described below with reference to the drawing.

Fig. 1 is a side view of an embodiment the frame saw machine according to the invention, wherein a side part of the stand has been omitted;

Fig. 2 shows the lower part of the frame saw machine seen in the direction of arrow II of FIG.

The frame saw machine shown has a stand 11 which stands on a foundation 12. The stand carries in his lower part one driven by an electric or hydraulic motor 13 at a constant speed Crank drive with a crankshaft 14 and a connecting rod 15. In its upper part, the stator is in the usual way

409843/0176

rait vertical, optionally adjustable sliding guides 16 are provided. These interact with slide blocks 17 on a rigid saw frame 18 in which a plurality of saw blades 19 parallel to one another are clamped in vertical planes. The saw frame 18 is hinged to the connecting rod 15 and thus moves up and down in the stand when the crankshaft is rotated. The strain to be sawn or block is in a conventional manner mittelp upper and lower feed rollers in a horizontal ^2o: direction by the stator and moves the saw frame. . ·

As far as described above, the frame saw machine shown is known. What is new is that the bearings 21 of the crankshaft 14 are not arranged stationary in the stand 11, but on a cradle 22, which on the stand over four parallel and pendulum members 23 arranged on both sides of the crankshaft of the same length are suspended in a pendulous manner. The cradle 22 has two cross members 24 which are rigidly connected to one another via longitudinal members 25.

The cradle 22 can thus substantially back and forth in the horizontal direction and at right angles to the axis of the crankshaft swing, not shown stops prevent excessive deflection of the cradle. The vibration is free, insofar as the movement of the cradle is not inevitable is performed and this is fixed within the limit of the attacks

409843/0176

vibration range only due to friction and inertia and gravity is counteracted. As a result, the cradle ate via pendulum links in the manner shown is suspended and is thus raised slightly when it moves out of the central position, i.e. the position in which the pendulum links are vertical and the cradle and the crankshaft assume their lowest position, in the one or moved in the other direction, gravity always tends to return the cradle to this position.

As can be seen from Fig. 1, the cradle 22 also carries the drive motor 13, which thus the vibration the cradle participates.

When the driven by the crank mechanism 14, 15 Saw frame 18 moves up and down in the stand during sawing, carries out the cradle 22 and consequently also the Crank wool creates a transverse oscillation around its central position on the pendulum links 23. This transverse oscillation has the same frequency as the up and down movement of the saw frame 18, but is so out of phase with it that that the cradle and the crankshaft are in their left end position (as seen in Fig. 1) when the saw frame at halfway during its downward movement Away after its lower end position. When the saw frame is in its upper or lower end position, are the cradle and the crankshaft in their communication, and if the saw frame is moving upwards is halfway to its upper end position,

409843/0176

the cradle and the crankshaft are in theirs right end position.

The amplitude of the transverse oscillation of the cradle 22 naturally depends on the geometric design, the dimensions of the cradle and the crankshaft, etc. but is independent of the speed of the crankshaft. as Example can be mentioned that the deflection after both Sides from the central position is about 5 cm in a frame saw machine according to the invention, in which the total weight of the cradle 22, the crankshaft 14, the connecting rod 15 and the saw frame about 3 500 kg, the speed 380 rpm., the length of the pendulum links 23 is about 24 cm and their distance across the crankshaft is about 150 cm. With this frame saw machine the total tensile force in the pendulum links, i.e. the force that the cradle exerts on the stand, fluctuates between 3,300 and 3,500 kp (32,300 and 34,300 newtons). The vertical component of this force is almost entirely the Gravity on said parts. The horizontal component varies between 0 and about 750 kg (0 and 7 nev / ton). If the crankshaft were mounted in a stationary position opposite the stand, as is the case with the current frame saw machines is the case, the horizontal component would fluctuate between 0 and about 14,000 kp (O or 137,000 newtons).

409843/0176

In the embodiment shown, the transverse oscillation is essentially only through a cradle counteracted gravity. However, it is within the scope of the invention to provide springs or other means which always weigh the cradle against its central position. Of course, the pendulum members 22 in the The central position should not be exactly, parallel and vertical, but rather they can also be arranged in such a way that they are slightly inclined to the vertical in the central position.

409843/0176

Claims (3)

Claims 1, frame saw machine with one stand, one im Stand up and down movable saw frame and a saw frame drive with a crankshaft and a connecting rod articulated to the saw frame, characterized in that that the crankshaft (14) is rotatable in one of the stator (11) carried cradle (22) is mounted under the action of the forces generated by the crankshaft during its Rotation exerts on them, relative to the stand back and forth is movable substantially in the horizontal direction at right angles to the axis of the crankshaft. 2.'Gattersägemaschine according to claim 1, characterized in that that the cradle (22) on the stand (11) over Pendulum links arranged on both sides of the crankshaft (14) (23) is suspended pendulum. 3. Frame saw machine according to claim 2, characterized in that that the pendulum members (22) are essentially the same length and parallel to one another. 409843/0176 Blank page