Drum for a chopping device, in particular a precision chipper

Abstract

A drum for a precision chipper, said chipping device comprising: a shaft on which the drum is arranged, wherein cutting tools are provided on the outer circumference of the drum in blade holders, which cutting tools are used to chop the material to be chipped; at least one distancing piece, which has a support surface or contact surface for the material to be chipped on the drum, the height of which distancing piece being used to determine the chip size, wherein the vertical position of the distancing piece on the drum can be set or adjusted. The distancing piece, when viewed in cross-section, has an approximately T-shaped form such that it can be placed on the outer edge of the drum disk by means of a positively locking surface of the distancing piece, said surface being formed on the face pointing towards the drum by the inner radius of the distancing piece.

Claims

1. A drum for a precision chipper comprising a shaft and at least two discs arranged in parallel on the shaft, cutting tools are provided on outer circumferences of the discs in blade holders, and elongated distancing pieces each having a supporting surface or contact surface on outer circumferences of the discs, height of the discs determining a chip size for a chipping process, wherein a level of the distancing pieces on the discs can be set or changed, wherein the distancing pieces, seen in cross-section transversely to longitudinal extensions of the distancing pieces, are configured T-shaped with an upper web having two form fitting surfaces corresponding with an outer radius of the outer circumferences of the drum discs, wherein the form fitting surfaces are displaced to each other, so that the distancing pieces can be placed on the outer circumferences of the discs in two different height positions relative to central axes of the discs by the form-fitting surfaces.

2. The drum according to claim 1, wherein the distancing piece is arranged on the drum such that the distancing piece can be replaced.

3. The drum according to claim 2, wherein the distancing piece is a deflector.

4. The drum according to claim 1, wherein the drum is configured as a rotor.

5. The drum according to claim 1, wherein the blade holders along with the cutting tools and the distancing pieces on each disc.

6. The drum according to claim 1, wherein the blade holders are configured in several parts, consisting of a blade holder bottom, an intermediate piece, and a pressure piece, wherein the cutting tool is arranged between the intermediate piece and the pressure piece, two distancing pieces and two cutting tools are arranged on each disc.

7. The drum according to claim 1, wherein the cutting tools or the distancing pieces of two adjacently arranged drum discs are arranged offset.

8. The drum according to claim 1, wherein a side of the distancing piece that is placed on the disc which is a side of the upper web the distancing piece facing in mounted position the disc, corresponds with an outer radius of the disc.

9. The drum according to claim 7, wherein a middle web of the distancing piece has at least two bore holes interacting with fasteners for fastening the distancing piece on the disc.

10. The drum according to claim 9, wherein the middle web of the distancing piece has two other bore holes in order to attach the distancing piece the disc at another level with reference to a center of the disc.

11. The drum according to claim 1, wherein bore holes at a middle web of the distancing pieces interacting with fasteners for fastening the distancing pieces on associated disc, and wherein the bore holes for height adjustment of the distancing piece are configured as elongated holes.

12. The drum according to claim 11, wherein the bore holes have notches for fixing the distancing piece at levels defined by the notches.

13. The drum according to claim 1, wherein a triangularly configured support pre-surface is provided on the support surface.

14. The drum according to claim 13, wherein the support pre-surface has flattened corners, and the support pre-surface is a protecting element for the support surface.

15. A precision chipper with at least one drum according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following the invention will be described in detail by means of an example. In the drawings:

(2) FIG. 1 a front perspective view of an embodiment of the drum according to the invention, and

(3) FIG. 2 a front elevational view of the drum shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

(4) FIG. 1 shows a three-dimensional representation of an embodiment of the drum 1 according to the invention for the chopping device. It is pointed out that this embodiment in no way restricts the invention, and presents only one of several possible embodiments. Drum 1 is arranged on a shaft 2. In the shown embodiment the drum consists of five drum discs 11 arranged spaced on the shaft 2. Two cutting tools 3 are arranged on each of the drum discs 11 in blade holders 31. The blade holders 31 consist of a blade holder bottom 33, an intermediate piece 32, and a pressure piece 33, the cutting tool 3 being arranged between the intermediate piece 32 and the pressure piece 33. The distancing piece 4 is arranged in cutting direction in front of the cutting tool 3. The distancing piece 4 is configured T-shaped, as can be seen clearly in FIG. 1 in the bottom distancing piece 4. The distancing piece 4 is attached through its middle web on one side to the drum disc 11. Attaching is in bore holes 45 by means of fastening means 43. On the middle web of the T-shaped distancing piece 4 other bore holes 44 are provided. These are provided for the case that the distancing piece 4 should be fastened to the drum disc 11 at another level. This is carried out in a simple manner by fastening the distancing piece 4, after releasing it from the fastening means 43, on the other side of the drum disc 11 in bore holes provided here correspondingly by means of bore holes 44 and the fastening means 43. As it can be seen the upper web of the T is provided offset at different levels, and this is on the side facing the drum discs 11 when used as intended. At the inner radius of the distancing piece 4 form fitting surfaces 46 are provided. The distancing piece 4 has a support surface 41 that is active before the cutting tool 3 is active or attacks the material to be chopped. i.e., the support surface 41 determines the chip size of the material to be chopped. Seen in cutting direction a support pre-surface 42 is provided in front of the support surface 41, the support pre-surface being designed essentially triangularly. This support pre-surface 42 has rounded or flattened corners. The support pre-surface 42 serves as protecting element for the support surface 41.

(5) FIG. 2 shows a front view of the drum 1 shown in FIG. 1. The reference numbers presented in FIG. 1 are also used in the same way in this figure for identical features so that a new presentation is not necessary.

(6) The invention has been described before by means of an example. The claims filed now and to be filed later on along with the application are attempted formulations without prejudice for obtaining a-broader protection.

(7) The dependent claims refer to the further embodiment of the subject matter of the main claim by means of the characteristics of the respective dependent claim. However, these are not to be understood as a waiver for obtaining independent, subjective protection for the characteristics of the referred dependent claims.

(8) Characteristics, so far only disclosed in the description, can be claimed in the course of proceedings as being of decisive inventive relevance in the claims, for example to distinguish from the state of the art.