DE2345961A1 - Wood chipper blade shaft - has two blades offset on common holder, for comb and/or stripper blades - Google Patents

Abstract

Blade shaft for a wood chipper has comb blades in holders, preceded by a chip-collecting space bounded by a gap-limiter, a flywedge and wood support bars. Two comb blades or a comb and a stripper blade, are arranged, offset by the division of the blade edges, on a common holder. Pref. each holder has a distance piece, on which is supported the blade facing the holder, which has a recess for passage of the fasteners connecting the more remote blade to the holder, held by clamp seating between the holder and the more remote blade. The blade shaft can receive a larger number of blades, to give higher productivity.

Description

of the company Bürener Maschinenfabrik GmbH, 4793 Buren, Fürstenberger Str. 37

concerning:
"Knife shaft for wood chipping machines"

The invention relates to a knife shaft for wood cutting machines with arranged on the circumference, held by holders in the shaft, in front of which one of a gap limiter, a centrifugal wedge and a chip collection space delimited by wooden support bars or comb knives.

In the case of known knife shafts which are equipped with comb knives, one that cuts into a gap is seated on each holder Comb knife. Om the strip that made the gap of the comb knife leaves, cut away, successive comb knives have to be axially offset around the gap between two Cutting be arranged so that the strip is cut away by the following knife. This is just it possible to accommodate a limited number of knives in the knife shaft.

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The object of the present invention is to provide _for a knife shaft which can accommodate a greater number of blades to achieve .to a larger production rate, at the same time the chip quality is improved.

This object is achieved by a knife shaft of the type mentioned, which is characterized in that two comb knives offset by one knife pitch or one comb knife and one strip knife on a common one Holders are arranged so that a stepped cutting edge is created, which chips over the entire length of the cutter head cuts that correspond to the division of a comb knife. This way it will double the number of cutting on the knife shaft with the same number of holders as before - housed: the cutting edge of the rear comb knife or The strip knife cuts those in the gaps of the front caliper knife stopped lanes.

It is advantageous here if the holder has a spacer on which the knife facing the holder is placed rests, the latter having a recess through which the second knife is fixed to the holder, for example by screws is connected, while the first, the holder zugeker ^ hte knife by a press fit between the holder and the second knife is held. This results in a very simple type of fastening for the two arranged one behind the other Knife.

In order to support the cutting edges of the front quay knife, When using two comb knives, the cutting edges become somewhat wider than the gaps, so that the cutting edges

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of the rear knife in the edge area are also still under the cutting edges of the front knife and thus these Support against the cutter head cheek. Alternatively, you can but also if Kaninesser with the same width of gaps and cutting edges are to be used, separate spacers for this purpose.

In order to avoid the chips breaking due to the impact in the chip collecting chamber, the latter is preferably in the Pear-shaped section, with webs on the knife holders forming a flight circle with the circumference of the knife shaft form. The centrifugal wedges can be covered by gap limiters that are positively fastened in the cutter head are.

It is also useful that the wooden support webs have a recess in front of the corresponding knife.

The invention is explained in more detail below with reference to the exemplary embodiment shown in the figures.

Fig.l and 2 show details of axially offset cuts through a cutter head, which according to of the present invention is formed, wherein two comb knives are used.

The cutter head 3 has a holder 2 which is provided with a spacer 11 and two comb knives 1, 1 * which is offset by half the knife division on the shark

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ter 2 are arranged. Here, the knife 1 rests on the spacer 11. It has a recess 12 through which the second knife 1 * is firmly connected to the holder 2 by screws 9, while the knife 1 by a press fit between the holder 2 and the knife 1 ' is held. This facilitates the adjustment in a semi-automatic setting device. The cutting edges of the comb knives 1 and I ¹ are slightly wider, about 1.5 mm, than the gaps.

In Fig. 1 the section through the cutter head is placed so that the knife 1 'as a whole in section, the knife 1, however, is shown only in the lower part in section and the attachment of the knife in the holder 2.

The holder 2 with the knives 1 and 1 'is in the The cutter head 3 is held in a manner known per se by a centrifugal wedge 10 which forms the bottom of the chip collecting space 5 forms, which is further limited by the gap limiter 6, so that a total of a pear-shaped chip collecting space 5 trains. The gap limiters 6 are form-fitting in the Cutter head 3 attached.

Furthermore, wooden support webs 7 are provided, which are shown in section in FIG. 2 and are connected to the holder 2 by means of screws. These wooden support webs have a recess 8 in front of the corresponding knife 1 or I ¹ (in FIG. 2, the recess 8 is in front of the knife 1 '). In this way, the cutting edge of a knife is also located behind the wooden support web 7, otherwise there,

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where the interruptions in the knife caused by the wooden support webs are from the following knife a chip of double thickness would be cut, which is avoided by making the recess 8. The order this recess in the wooden support bars 7 is not only suitable for knife shafts with comb knives, but also for those with strip knives, as the latter have the same advantages. The strip knife can then be formed rat continuous cutting edge.

- patent claims -

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Claims (7)

Claims IJ knife shaft for wood cutting machines with Kanmessern arranged on the circumference, held by holders in the shaft, in front of which there is a chip collection space delimited by a gap limiter, a centrifugal wedge and wood support webs or comb knives, characterized in that on a common holder (2) two to the knife edge division offset comb knives (1, I ¹ ) or a Kama and strip knife are arranged. 2. Knife shaft according to claim 1, characterized in that each holder (2) has a spacer (11) on which the knife (1) facing the holder is supported, and that the knife facing the holder also has a recess (12) has for the passage of the fastening means with which the knife (I ¹ ) facing away from the holder is connected to the latter, and is itself held by a press fit between the holder and the knife facing away from it. 3. Knife shaft according to claim 1 or 2, characterized in that the mutually offset cutting edges two comb knives are a little wider than the gaps between the cutting edges and the cutting edges of the one facing the holder Comb knife are supported by those of the knife turned away from him. 4. Knife shaft according to claim 1 or 2, characterized in that the cutting edges of the Kammonessers facing the holder are supported by spacers on the cutter head cheek. B09812 / 0195 • τ 5. Knife shaft according to one of the preceding claims, characterized in that the chip collecting space (5) in the Section is pear-shaped, the webs of the knife holder (2) forming a flight circle with the circumference of the Form knife shaft. 6. Knife shaft according to one of the preceding claims, characterized in that the centrifugal wedges (10) through gap limiters (6) are covered, which are positively attached in the cutter head (3). 7. Knife shaft according to one of the preceding claims, characterized in that the wooden support webs in front of the Knives have recesses (8). 5Ό981 2/0195