DE1052669B - Wood chip machine - Google Patents

Description

GERMAN

The invention relates to a wood chipping machine with mounted on the circumference of the knife shaft Knives. The invention consists in that the feed line for the longitudinally introduced Wood forms an acute angle with the knife shaft and that the cutting edges of the knives are ground stepwise one behind the other at the same angle. This training of the knife shaft with Feed has the following essential advantages:

It is no longer necessary to cut the wood to length before machining, which saves a lot of work will. It is no longer necessary to make grooves in the shaft body, as the chip thickness is limited always lies on the inner knife flight circle part, so that the shaft body can be used for any chip length is. The stepped ground knives make it possible to cut the shaft body so> to arrange that the tips or the step-shaped cutting edges, one behind the other come into engagement, lie on a helical line, the slope of the chip length is equivalent to. The wood to be machined is inevitably inclined to the rolling speed Knife shaft, but parallel to the cutting edge, fed so that the cut is always parallel to the Fa wood chip machine

sern takes place. The effect of the new knife shaft

is similar to that of a hob cutter, with the wood fed in taking the form of a rack, but with the teeth, d. H. the entire cut wood surface, cut deeper and deeper as the feed progresses so that it is completely machined. Other advantages are that the feed the machine can be done automatically via chains or roller conveyors, so that an operation of the Machine is not required. A debarking machine and splinter detector can be arranged in the feeder belt will. Due to the forced feed, which depends on the tool shaft speed and the Number of knives or cuts per revolution is available, the chip thickness is limited at the same time. Since the wooden support table and the knife shaft axis are not in one plane, there is a simple possibility given to cut the wood at an angle, but parallel to the grain, with a pulling cut.

For cutting waste wood, you already have a stop rail on a support table in front of a knife disc arranged in an oblique direction to the knife disc and the wood in the space between Knife disk and stop rail filled, with it being pulled forward in the direction of rotation of the knife disk and so can be machined. Here, however, the acute angle has a different function than with of the invention, in which a special positive drive is provided for the advance.

Applicant:

F. Meyer & Schwabedissen,
Herford (Westphalia), Diebrocker Str. 3

Dipl.-Ing, Josef R. Rothwangl ₁ Herford (Westphalia),
has been named as the inventor

An exemplary embodiment is shown in the drawings. It shows

1 shows the knife seat in a simplified side view,

FIG. 2 shows the front view of the knife in the direction of arrow A in FIG. 1,

3 shows the top view of the machine,

4 shows the wood supply in a simplified perspective view.

The knife shaft body 2 , in which the individual step-ground knives 3 are fastened, is mounted on a shaft 1. The knives consist of the actual knife blade, which is embedded in the body of the knife shaft 2 , running parallel to or at a certain angle to the shaft 1. They are embedded in the knife shaft body in such a way that their surface bearing the cutting edges forms the required cutting angle of about 60 ° in relation to the knife shaft tangent.

The knives used in the machine are ground in such a step or saw shape that all Low points of the individual levels and all high points are each on a line that is parallel or extends at a certain angle to the axis of the knife shaft. As a result, lie all cutting edges at an angle to the knife shaft axis. This angle is designated as angle α in FIG. 2.

Of course, the chest of each step is relief-ground at the angle β, just as the wedge angle γ is calculated in such a way that the teeth are prevented from jamming. Each step or each tooth thus works with its cutting edge in such a way that the processed wood is also toothed.

In order to enable even chip removal, the knives are positioned on the circumference of the

809 769/148

Claims (4)

Knife shaft distributed that: z. B. the tips 5 of each step or each tooth 6 of the second and further knife are offset in relation to the tips or teeth of the first knife, so that when these have been connected to one another, a helical line is created. This imaginary helical line runs constantly around the knife shaft at the same distance. In other words: the pitch of the knife pitch corresponds to a chip length on the circumference of the knife shaft, i.e. also a pitch. As a result, the cut is shifted by one pitch for each revolution. In order to enable the chips to slide off properly, a chip groove 4 is provided in front of each knife 3. The drive of the corrugation takes place via a belt drive 7 from a motor (not shown). The corrugation drives the corrugated feed rollers 9 via a switchable gear 8, so that the feed device feeds the wood to the machine according to the speed of the cutter shaft 2. By combining the two movements, they are inevitably coordinated with one another. The requirement of this coordination arises from the fact that, on the one hand, the wood to be machined suffers a constant advance and, on the other hand, the pitch of the teeth, in relation to this advance, corresponds to a division of the knife 3 per revolution. The supplied wood takes on the shape of a rack, in which, however, the teeth, i.e. the entire cut wood surface, are cut deeper and deeper in the course of the advance so that it is completely machined. The provided gear 8 is designed such that when using knives with a different pitch, that is, a different step size and therefore a different chip length, the rotary movement of the feed rollers 9 can be adjusted to the corresponding pitch. The transmission can be adjusted by moving the switching lever 10 or 11. Furthermore, it is designed in such a way that a reversal is also possible, so that the inserted wood receives a backward movement and thus falls out of the machine. Since the chip removal should take place parallel to the grain of the wood, while the individual cutting edges, as already mentioned, are at an angle α to the corrugation, the wood is fed in at the same angle. Parallel to the pair of feed rollers 9 at an angle α to the corrugation, several toothed transport rollers 12 are arranged, which are driven via cardan shafts and gear housings 14 and are also in positive connection with the drive of the shaft 1. The transport rollers 12 have two tasks to fulfill: 1. The synchronous advancement of the wood, and 2. to prevent the wood from turning during processing by means of their cutting edges. Claims. 1. Wood chipping machine with knives attached to the circumference of the knife shaft, characterized in that that the feed line for the wood introduced in the longitudinal direction with the knife shaft forms an acute angle and that the cutting edges of the knives are stepped one behind the other are ground at the same angle. 2. Wood chip machine according to claim 1, characterized in that the cutter shaft is coupled to the feed device via an adjustable gear (8). 3. Wood chipping machine according to claim 1, characterized in that the stepped ground knives (3) are arranged offset on the shaft body in such a way that their pitch on the circumference is equal to the pitch, and the tips (5) of each tooth or each step ( 6) form a helix. 4. Wood chipping machine according to claim 1, characterized in that the feed line arranged at an acute angle to the knife shaft consists of one or more pairs of corrugated rollers (9) and one or more toothed transport rollers (12) . Considered publications:
German patent specification No. 924 950. 1 sheet of drawings © 809'76 »/ 148 3.59