Claims
- 1. A debarking shaft (3) for a debarking machine (1), said debarking machine being intended for the decortication or pretreatment of logs (2) for separately performed final barking and for the expulsion of at least some of the removed barks from a wood flow passing through the debarking machine, said debarking machine comprising a number of rotatable debarking shafts (3) extending parallel to the advancing direction of the logs (2) to be fed therethrough and provided with a number of teeth (4) extending beyond the circumferential surface of the shaft (3) and adapted to strip bark off the presently processed logs (2) transversely to the lengthwise direction of the logs and at the same to convey the logs transversely relative to said shafts (3), and said shafts (3), together with the teeth (4) thereof, being adapted to constitute at least a part of a support surface, upon which the presently processed logs (2) travel through the debarking machine (1), characterized in that the debarking shaft (3) has its teeth (4) designed as a number of annular tooth rims (20), each of said tooth rims comprising two or more releasably connected elements (21, 22), having the outer periphery provided with the teeth (4) and said elements being adapted to be fitted around a body member (25) of the debarking shaft (3) by way of press clamping.
- 2. A shaft as set forth in claim 1, characterized in that the elements (21, 22) of the tooth rim (20) are provided with clamping means (23) for forcing the elements (21, 22) toward each other against the body member (25) of the debarking shaft (3).
- 3. A shaft as set forth in claim 2, characterized in that the clamping means (23) comprises a headless screw, having one end provided with a left-handed thread and the other end with a right-handed thread, as well as a gripping section (24) between the threads for turning the headless screw.
- 4. A shaft as set forth in claim 1, characterized in that the debarking shaft (3) has its body member (25) constituted by a circular pipe.
- 5. A shaft as set forth in claim 1, characterized in that the debarking shaft (3) has its body member (25) provided, for each tooth rim (20), with a guide element, preferably a key and slot, for guiding the tooth rims to position.
- 6. A shaft as set forth in claim 1, characterized in that the debarking shaft (3) has its body member (25) designed in its cross-section as a polygon.
- 7. A shaft as set forth in claim 1, characterized in that the teeth (4) are designed to be effective in both rotating directions of the debarking shafts (3).
- 8. A shaft as set forth in claim 1, characterized in that the teeth (4) effective in opposite rotating directions of the debarking shaft (3) are different from each other.
- 9. A shaft as set forth in claim 1, characterized in that the teeth (4) effective in opposite rotating directions of the debarking shaft (3) are identical to each other.
- 10. A shaft as set forth in claim 1, characterized in that the tooth rim (20) has one or more sections which are toothless.
- 11. A debarking machine for removing bark from logs fed lengthways therethrough, said debarking machine comprising:
a plurality of rotatable debarking shafts, each debarking shaft comprising a shaft body; a plurality of annular tooth rims, each of said tooth rims comprising two or more releasably connected elements having an outer periphery configured as debarking teeth; and clamping means for clamping said annular tooth rims to said shaft body.
- 12. The debarking machine of claim 11, wherein said clamping means comprises fastener means for drawing the elements toward each other around the shaft body.
- 13. The debarking machine of claim 12, wherein the fastener means comprises a headless screw having a left-hand threaded shank portion and a right-hand threaded shank portion connected by a gripping section between the left-hand and right-hand threaded shank portions for turning the headless screw.
- 14. The debarking machine of claim 11, wherein the shaft body is cylindrical.
- 15. The debarking machine of claim 11, wherein the shaft body is provided with a guide element for each tooth rim for guiding the tooth rims into position.
- 16. The debarking machine of claim 15, wherein the guide element comprises key projecting from the shaft body or a slot in the shaft body.
- 17. The debarking machine of claim 11, wherein the shaft body is configured in its cross section as a polygon.
- 18. The debarking machine of claim 11, wherein the tooth rims are provided with teeth that are effective at stripping bark from logs regardless of the direction of rotation of the debarking shafts.
- 19. The debarking machine of claim 18, wherein the teeth effective in one direction are different from the teeth effective in the other direction.
- 20. The debarking machine of claim 18, wherein the teeth effective in one direction are identical to the teeth effective in the other direction.
- 21. The debarking machine of claim 11, wherein one or more tooth rims have one or more elements which are toothless.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Application No. 60/283,770, filed Apr. 13, 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60283770 |
Apr 2001 |
US |