Chipper with detachable facing knives

Abstract

A rotary chipping head with multiple knife structures distributed about its periphery. Each knife structure includes an end-located chipping knife with a cutting edge movable in a plane disposed perpendicular to the axis of rotation of the chipping head. End-located facing knives are interspersed with the knife structures for producing a smooth face in the work being processed. Anvils preceding the facing knives produce compression in the work being processed. Detachable facing elements mount the facing knives and the anvils.

It is claimed and desired to secure by letters patent: 
     
       1. A rotary chipping head comprising: a chipping head body mountable for rotation about an axis in an operative direction,   said body having a face at one end thereof delineating the end of the body and said face extending generally normal to said axis and said body having an outer periphery extending about said axis disposed in an axial direction inwardly from said face,   knife structure detachably mounted on the periphery of said body having one cutting edge extending in an axial direction and effective to cut chips from a workpiece as a workpiece is advanced into the knife structure and a second cutting edge producing a cut in the workpiece in a plane disposed perpendicular to said axis,   an end-located facing knife mounted on said end of said body having a third cutting edge disposed normal to the axis of said body for producing a facing cut in a workpiece which trails the cut produced by the second cutting edge, with said body rotated in an operative direction, .Iadd.the third cutting edge being axially displaced from the second cutting edge, .Iaddend.and   an anvil portion mounted on the end of said body disposed in a circumferential direction intermediate the said second and third cutting edges operable to press against the workpiece immediately prior to the workpiece being cut by said third cutting edge.   
     
     
       2. The chipping head of claim 1, wherein the end-located facing knife and anvil portion are mounted on a common facing element which is detachably and removably mounted on the end of the chipping head body. 
     
     
       3. The chipping head of claim 2, wherein the end-located facing knife is detachably mounted on the facing element. 
     
     
       4. The chipping head of claim 1, wherein the end-located facing knife has a front face that faces inwardly on the end of the chipping head body and which is disposed at an acute angle of less than 45-degrees with respect to said face of the cutter head body. 
     
     
       5. The chipping head of claim 4, wherein the end-located facing knife is a double-edged knife, and includes a pair of oppositely disposed knife edges, either one of which is positionable as a third cutting edge. 
     
     
       6. The chipping head of claim 1, wherein the facing knife and anvil portion are mounted on a common first facing element which is detachably and removably mounted on the end of the chipping head body, and which further includes a detachably and removably mounted second facing element adapted to be mounted on said chipping head body as a replacement for said first facing element, said second facing element having a saw-type cutter mounted thereon for producing a rough cut in a workpiece. 
     
     
       7. A rotary chipping head comprising: a chipping head body mountable for rotation about an axis in an operative direction,   said body having a face at one end thereof delineating the end of the body and said face extending generally normal to said axis and said body further having an outer periphery extending about said axis disposed in an axial direction inwardly from said face,   multiple knife structures detachably mounted on the periphery of said body with the knife structures being distributed in a circumferential direction about the periphery of said body, each knife structure having one cutting edge extending in an axial direction and effective to cut chips from a workpiece as a workpiece is advanced into said structure and a second cutting edge extending normal to said axis producing a cut in the workpiece in a plane disposed perpendicular to said axis, and   an end-located facing knife associated with each of said knife structures mounted on said end of said body having a third cutting edge disposed normal to the axis of said body for producing a facing cut that trails the cut produced in a workpiece by the second cutting edge of the knife structure associated therewith, with said body rotated in an operative direction.Iadd., the third cutting edge being axially displaced from the second cutting edge.Iaddend..   
     
     
       8. The rotary chipping head of claim 7, which further includes an anvil portion mounted on the end of said chipping head body intermediate each knife structure and the end-located knife associated with the knife structure for pressing against the workpiece prior to being cut by the third cutting edge of an end-located knife. 
     
     
       9. The rotary chipping head of claim 7, wherein each end-located facing knife is a double-edged knife, and includes a pair of oppositely disposed knife edges, either one of which is positionable as a third cutting edge. 
     
     
       10. A rotary chipping head comprising: a chipping head body mountable for rotation about an axis in an operative direction,   said body having a face at one end thereof delineating the end of the body and said face extending generally normal to said axis and said body having an outer periphery extending about said axis disposed in an axial direction inwardly from said face,   multiple knife structures detachably mounted on the periphery of said body equally circumferentially distributed about the periphery of said body, each knife structure including one cutting edge extending in an axial direction and effective to cut chips from a workpiece as a workpiece is advanced thereinto and a second cutting edge for producing a cut in the workpiece in a plane disposed normal to said axis,   and a pair of trailing end-located knives associated with each of said knife structures, one of said end-located knives in a said pair having a third cutting edge disposed normal to the axis of said body for producing a facing cut in a workpiece that trails the cut produced by said second cutting edge, and the other of said end-located knives in said pair having a fourth cutting edge disposed normal to the axis of said body for producing a facing cut in a workpiece that trails the cut produced by said third cutting edge.Iadd., the third and forth cutting edges being axially displaced from the second cutting edge and from each other.Iaddend..   
     
     
       11. The rotary chipping head of claim 10, which further includes an anvil portion mounted on the end of said chipping head associated with each knife structure which contacts the workpiece with rotation of the workpiece immediately in advance of said third cutting edge and which is operable to press against the workpiece prior to being cut by the third cutting edge. 
     
     
       12. The rotary chipping head of claim 11, wherein said pair of end-located knives and said anvil portion are mounted on a common facing element which is detachably mounted on the end of said chipping head body. .Iadd. 
     
     
       13.  A rotary chipping head comprising: a chipping head body mountable for rotation about an axis in an operative direction,   said body having a face at one end thereof delineating the end of the body and said face extending generally normal to said axis and said body further having an outer periphery extending about a perimeter of said face,   a side-chipping knife detachably mounted about the periphery of said body, the side-chipping knife having a first cutting edge extending at an angle relative to said axis away from said face and effective to cut chips from a workpiece as the workpiece is advanced into said side-chipping knife, and   at least two end-located knives associated with the side-chipping knife, said two end-located knives having second and third cutting edges, respectively, disposed in axially offset planes, said planes being generally normal to the axis of said body whereby the second and third cutting edges produce facing cuts in the workpiece which are axially offset from one another with said body rotated in an operative direction..Iaddend..Iadd.   
     
     
       14.  The chipping head of claim 13, further comprising a third end-located knife associated with the side-chipping knife, the third end-located knife having a fourth cutting edge disposed in a plane axially offset from the planes associated with the second and third cutting edges and..Iaddend..Iadd.15. The chipping head of claim 14, wherein the third cutting edge is positioned radially inwardly toward the axis relative to the second cutting edge, and the fourth cutting edge is positioned radially inwardly toward the axis relative to the third cutting edge..Iaddend..Iadd.16. The chipping head of claim 15, wherein the third and fourth cutting edges are radially positioned to substantially trail the cut produced by the second cutting edge in view of the rate at which the workpiece is advanced and the speed at which the chipping head is 
     
     
        rotated..Iaddend..Iadd.17.  The chipping head of claim 16, wherein the third end-located knife and the end-located knife with the third cutting edge are mounted on a common facing element which is detachably mounted to the end of the chipping head body, whereby different facing elements can be selectively mounted to the chipping head body to adjust the positions of the third and fourth cutting edges to accommodate different advance rates for the workpiece and different head rotation speeds..Iaddend..Iadd.18. The chipping head of claim 13, wherein the third cutting edge is positioned radially inwardly toward the axis relative to the second cutting edge..Iaddend..Iadd.19. The chipping head of claim 18, wherein the third cutting edge is positioned to substantially trail the cut produced by the second cutting edge in view of the rate at which the workpiece is advanced and the speed at which the chipping head is rotated..Iaddend..Iadd.20. The chipping head of claim 13, further comprising an anvil portion mounted on the end of said chipping head body at a circumferential position intermediate the second and third cutting edges and being operable to press against the workpiece immediately prior to the workpiece being cut by the third cutting edge..Iaddend..Iadd.21. The chipping head of claim 20, wherein the anvil portion and the end-located knife having the third cutting edge are mounted on a common facing element which is detachably mounted to the end of the chipping head body..Iaddend..Iadd.22. The chipping head of claim 21, wherein the end-located knife having the third cutting edge is detachably mounted on the common facing element..Iaddend..Iadd.23. The chipping head of claim 21, wherein the end-located knife having the third cutting edge and the anvil portion are mounted on the common facing element which is selectively attachable on the end of the chipping head body, and which further includes a second facing element selectively attachable on said chipping head body as a replacement for said first facing element, said second facing element having a saw-type cutter mounted thereon for producing a rough cut in the workpiece..Iaddend..Iadd.24. The chipping head of claim 13, wherein each of the end-located knives has a front face that faces inwardly on the end of the chipping head body and which is disposed at an acute angle of less than 45-degrees with respect to the face of the chipping head body..Iaddend..Iadd.25. The chipping head of claim 24, wherein the end-located knives each include a pair of opposed knife edges, either one of which is positionable as a cutting edge..Iaddend.