# US 4,396,048 A · Debarking machine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,396,048 A - Document ID: US4396048A - Status: Granted - Kind: A - Application number: 06/244,791 - Filed: 1981-03-17 - Granted: 1983-08-02 - Earliest claimed: 1981-03-17 - Assignees: Forest Country Engineering Co. - Inventors: Dennis Dubey - Web page: https://patentgrep.com/patent/US4396048A ## CPC - B27L 1/10: using rotatable tools (B27L1/04, B27L1/08, B27L1/12 take precedence) - B27L: REMOVING BARK OR VESTIGES OF BRANCHES (forestry A01G); SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER ## Abstract A machine is provided for removing the bark from logs. The machine supports a log for linear movement in the direction of the longitudinal axis of the log and for rotation about its longitudinal axis. A saw is supported for rotation about a second longitudinal axis generally parallel to the longitudinal axis of the log. The saw includes a saw blade wrapped around the second longitudinal axis in a helical pattern, the saw blade having a radially outer surface, a radially inner surface, and a cutting edge including saw teeth extending in the direction of the longitudinal axis of the log, the tips of the saw teeth projecting outwardly with respect to the saw blade. The saw is supported for selective engagement with the log, and is rotated about its longitudinal axis whereby the teeth will engage said log to strip the bark from the log. ## Claims ### Claim 1 A machine for removing the bark from logs, the machine comprising: means for supporting a log for linear movement in the direction of the longitudinal axis of the log and for rotation about said longitudinal axis, a saw supported for rotation about a second longitudinal axis generally parallel to the longitudinal axis of the log, said saw including a saw blade wrapped around said second longitudinal axis in a helical pattern, said saw blade having a radially outer surface, a radially inner surface, and a cutting edge, said cutting edge including saw teeth, said saw teeth extending in the direction of said longitudinal axis and the tips of said saw teeth projecting outwardly with respect to said saw blade, means for supporting said saw for selective engagement with the log whereby said saw teeth can engage the log, and means for causing rotation of said saw about said second longitudinal axis whereby said saw teeth will engage the log to strip the bark from the log. ### Claim 2 (depends on 1) The machine set forth in claim 1 and further including a pair of elongated sidewalls adapted to house the log therebetween, said elongated sidewalls being spaced apart at their lower edges and sloping upwardly and away from each other. ### Claim 3 (depends on 1) The machine set forth in claim 1 and further including a conveyor positioned beneath said means for supporting the log and for receiving material removed from the log by said saw. ### Claim 4 (depends on 3) A machine set forth in claim 3 and further including a pair of elongated sidewalls adapted to house the log therebetween, said sidewalls being spaced apart at their lower edges and sloping upwardly and outwardly away from each other, said sidewalls channeling material removed from said log onto said conveyor. ### Claim 5 (depends on 1) The machine set forth in claim 1 wherein the means for supporting the log includes at least one roller having a generally horizontal axis of rotation oriented obliquely with respect to said longitudinal axis of the log. ### Claim 6 (depends on 5) A machine as set forth in claim 5 wherein said means for supporting the log further includes means for rotatably driving said roller. ### Claim 7 (depends on 6) The machine as set forth in claim 6 wherein the means for supporting the log further includes means for supporting the roller for vertical movement. ### Claim 8 (depends on 1) The machine as set forth in claim 1 and further including a pair of elongated sidewalls positioned on opposite sides of said roller, said sidewalls being spaced apart at their lower edges to define an elongated opening therebetween and sloping upwardly and outwardly away from each other, and at least one roller having a generally horizontal axis of rotation oriented obliquely with respect to said longitudinal axis of the log, and means for causing vertical movement of said roller with respect to said sidewalls. ### Claim 9 (depends on 8) The machine as set forth in claim 8 and further including a conveyor positioned beneath said roller and for receiving material removed from said log by said saw. ### Claim 10 (depends on 1) The machine as set forth in claim 1 wherein the means for supporting the log includes a plurality of rollers, means for supporting said rollers in spaced apart relation in the direction of the longitudinal axis of the log, said rollers being supported for rotation about horizontal axes oriented obliquely with respect to the longitudinal axis of the log, and means for causing vertical movement of said rollers. ### Claim 11 (depends on 1) The machine as set forth in claim 1 wherein said saw teeth extend in a direction opposite to the direction of movement of the log. ### Claim 12 (depends on 1) The machine as set forth in claim 1 wherein the means for supporting said saw includes means for causing selective movement of said saw toward and away from the log. ### Claim 13 (depends on 1) A machine as set forth in claim 1 and further including a second saw supported for rotation about a longitudinal axis generally parallel to said longitudinal axis of said log and spaced from said longitudinal axis of said saw, and means for supporting said saws above said log and on opposite sides of the longitudinal axis of said log. ### Claim 14 (depends on 13) The machine as set forth in claim 13 wherein the blade of one of said saws is helically wrapped around its longitudinal axis in a first rotational direction and wherein said means for rotating causes rotation of said saw in said first direction, and wherein the blade of the other of said saws is helically wrapped around its longitudinal axis in an opposite rotational direction and further including means for causing rotation of said other of said saws in said opposite rotational direction. ### Claim 15 (depends on 1) The machine as set forth in claim 1 wherein said means for causing rotation of said saw causes rotation of said saw in the same rotational direction as the direction of helical wrap of said blade around the longitudinal axis of said saw. ### Claim 16 A machine for removing the bark from logs, the machine comprising: means for supporting a log for linear movement in the direction of the longitudinal axis of the log and for rotating said log about said longitudinal axis, a cutting means for engaging the log and for stripping bark from the log, and means for supporting said cutting means for selective engagement with the log, said means for supporting the log including at least one roller for supporting a log thereon, said roller having a generally horizontal axis of rotational oriented obliquely with respect to said longitudinal axis of the log, and means for rotatably driving said roller, and a pair of elongated sidewalls adapted to house the log therebetween. ### Claim 17 (depends on 16) The machine set forth in claim 16 and further including a conveyor positioned beneath said means for supporting the log and for receiving material removed from the log by said saw, and wherein said sidewalls are spaced apart at their lower edges and slope upwardly and outwardly away from other, said sidewalls channeling material removed from said log onto said conveyor. ### Claim 18 (depends on 16) The machine as set forth in claim 16 wherein the means for supporting the log further includes means for supporting the roller for vertical movement. ### Claim 19 (depends on 16) The machine as set forth in claim 16 wherein the means for supporting the log includes a plurality of rollers, means for supporting said rollers in spaced apart relation in the direction of the longitudinal axis of the log, said rollers each being supported for rotation about horizontal axes oriented obliquely with respect to the longitudinal axis of the log, and means for causing vertical movement of said rollers. ### Claim 20 A machine for removing the bark from logs, the machine comprising: means for supporting a log for linear movement in the direction of the longitudinal axis of the log and for rotation about said longitudinal axis, a saw supported for rotation about a second longitudinal axis generally parallel to the longitudinal axis of the log, said saw including a saw blade wrapped around said second longitudinal axis in the helical pattern, said saw blade having a radially outer surface, a radially inner surface, and a cutting edge, said cutting edge including saw teeth, said saw teeth extending in the direction of said longitudinal axis and the tips of said saw teeth projecting outwardly with respect to said saw blade, and said saw blade including of a plurality of separable sections, each of said sections including at least one of said saw teeth, and means for releaseably securing said separable sections together, means for supporting said saw for selective engagement with the log whereby said saw teeth can engage the log, and means for causing rotation of said saw about said second longitudinal axis whereby said saw teeth will engage the log to strip the bark from the log.