Abstract: A spacer, blade core, assembly and methods for blade and blade core assemblies, including gang blade heads, include openings in blade cores for receiving spacers. A spacer and its opening can be the same shape or different shapes, and spacers can be interconnected or disconnected from each other. A spacer can be in contact or engaged with two blades, three blades, or more.

Abstract: A method of manufacturing engineered wood is provided, the method including: feeding wood through a processor while exposing the wood to compressive and tensile forces to produce naturally oriented strands of fibers; adding an adhesive to naturally oriented strands of fibers to provide adhesive covered strands; feeding the adhesive covered strands into a press; applying a first pressure to the adhesive covered strands to provide a pressed wood with a selected first dimension and a selected second dimension; and applying a second pressure normal to the first pressure to the pressed wood to provide an engineered wood having the selected first dimension, the selected second dimension and a selected third dimension and a selected density. An installation for manufacturing the engineered wood is also provided.

Abstract: Floor panels are shown, which are provided with a mechanical locking system comprising tongue and grooves provided with protrusions and cavities which are displaceable in relation to each other and configured such that the protrusions can obtain a vertically unlocked position where they match the cavities and a vertically locked position where the protrusions overlap each other.

Abstract: The invention relates to a method for producing a roughing tool (1), particularly a circular milling tool, comprising the following steps: fitting a lateral surface of a tool base body (10) that can be rotatably driven about an axis of rotation (2) with a number of cutting element blanks (20?) that are staggered in the axial and/or peripheral direction, such that a free edge of each cutting element blank (20?) protrudes out of the lateral surface in the mounted state; inserting a microtoothing comprising a plurality of axially spaced cutting teeth (21) into the respective free edges of the cutting element blanks (20?) by a material removal method, preferably by thermal machining, particularly preferably by eroding, in the premounted state on the tool base body (10). The invention further relates to a roughing tool produced by means of such a method.

Abstract: A router apparatus for cutting grooves in surfaces at a range of depths includes a housing having a central threaded aperture, a set of saw blades with a diameter less than the aperture. In addition, the apparatus includes at least one handle attached to a side of the housing, an adjustment bushing configured for operational engagement with the central threaded aperture, wherein turning the bushing adjusts the cutting depth of the set of saw blades, and a female coupling opposite the set of cutting blades wherein the female threads are operationally engageable with the male threads of a common right-angle grinder.

Abstract: A cutting tool assembly for milling a rail top, includes a first section and a second section mounted to the first section. Each section includes a plurality of insert-receiving pockets for receiving a plurality of different types of cutting inserts. The plurality of different types of cutting inserts are arranged in a plurality of helical teeth that may be separated by a helical chip flute. In one embodiment, a first type of cutting insert is formed with a radius, R, a second type of cutting insert is formed with a radius, R1, and a third type of cutting insert is formed with a radius, R2, to perform a milling operation on three different areas of the rail top.

Abstract: A cutting tool to cut a hollow vessel includes a conical member, a plurality of grooves, and a plurality of cutting members. The plurality of grooves are disposed in a semi-helix around an outer conical surface of the conical member. Each of the plurality of cutting members is disposed in fixed position within one of the plurality of grooves at a non-zero angle relative to a vertical axis.

Abstract: The invention relates to an interface between a knife and a knife holder, wherein the knife and the knife holder are designed such that the knife can be mounted on the knife holder in such a way that the knife is initially positioned on the knife holder in the axial direction, and then by rotating either the knife relative to the knife holder and/or the knife holder relative to the knife, the knife is locked on the knife holder with respect to the axial direction, wherein the knife has a single central fastening opening which is delimited by a knife edge region, and the knife holder has a fastening section for the fastening opening of the knife, which is delimited by a holder edge region.

Abstract: A waste strip-removing apparatus for use with a ripsaw that saws an incoming board into one or more usable boards and removes the opposite side edges, which become two waste strips that must be removed and transported to a different destination from that to which the usable board(s) is (are) transported. The apparatus includes two air-blasting units each having one or more air nozzles assigned to each waste strip. The air-blasting units are positioned with respect to a lateral direction by a positioning mechanism so that air directed from the nozzles impinges on the waste strips and moves them laterally away from the usable board(s). The positioning mechanism can include a linear motor having two forcers movable along a platen and respectively attached to air-blasting units.

Abstract: An adjustable router or shaper cutter assembly that facilitates the formation of an edge contour such as a rounded over contour on work-pieces of differing thicknesses.

Abstract: A stump grinder having a grinding member with a plurality of stacked plates. The stacked plates are joined by at least three bolts that extend the entire length of the plate stack and are secured by nuts at each end thereof. Adjacent plates are held apart from each other via spacers. Each spacer has a aperture through which one of the bolts passes. Each plate has three cutting elements secured thereon. The three cutting elements are spaced at approximately one hundred-twenty degrees apart from an adjacent cutting element. The three cutting blades are each mounted to have a different cutting path. To this end one of the blades is mounted on a first surface of the plate. The second blade is mounted on a second opposed surface of the plate and the third blade is mounted intermediate the first and second blades. The cutting paths may slightly overlap to ensure that now material is left uncut. The plates are mounted on a driven shaft.

Abstract: A device of double saw blades includes a first saw blade, a second saw blade, a driving device and security system. The first saw blade and the second saw blade rotate around a rotation axis oppositely, and respectively include a blade body and a cutting element mounting on a periphery of the blade body. The driving device connects with the first saw blade and the second saw blade, and has a driving diameter. The security system has a security distance provided between the blade bodies. The security system includes two rigidity enhancers. The rigidity enhancers respectively include a saw blade adapter mounting on an outer side of the blade bodies. The saw blade adapters respectively have a predetermined diameter to enhance a rigidity of the blade bodies, so as to reduce deformation thereof when working. The diameters are no more than the driving diameter.

Abstract: One aspect of the present invention includes a ripsaw stabilizing device that has a moveable carrier arm subassembly, a hold-down subassembly, a hold-down support engaged to the moveable carrier arm subassembly and a force applying subassembly engaged to the hold-down subassembly and the hold-down support that applies downward force such that downward force is applied to a piece of material being cut on both sides of the blade. Another aspect of the present invention includes a method for making a glue-line quality cut without further processing of the material being cut and without the use of a sacrificial material. Yet another aspect of the present invention includes a ripsaw including one or more ripsaw stabilizing devices of the present invention.

Abstract: A cutter head assembly for a wood planing machine includes a shaft, a plurality of cutter-mounting sleeve modules sleeved on the shaft, and a plurality of cutter modules respectively secured to the sleeve modules such that cutting edges of the cutter modules extend beyond outer wall surfaces of the sleeve modules. An angularly variable positioning mechanism includes an axially extending guiding member disposed on the mount segment, and a plurality of axially extending guided members disposed on inner wall surfaces of the sleeve modules to mate with the axially guiding member. By virtue of fitting engagement between the guiding member and a selected one of the guided member of each sleeve module that are sequentially sleeved onto the shaft, the cutting edges together define a cutting contour line that winds around the shaft.

Abstract: Embodiments of the present invention provide a wood processing machine adapted to cut wood workpieces along multiple optimized cutting paths. In various embodiments, the wood processing machine includes a first saw assembly and a second saw assembly that is disposed down stream from the first saw assembly. The first saw assembly is adapted to cut the workpiece along the first optimized cutting path and the second saw assembly is adapted to cut the workpiece along the second optimized cutting path.

Abstract: A movable blade unit for wood cutting machine is mounted to the rotating shaft of the wood cutting machine and includes a blade and an inner ring which is located between the blade and the rotating shaft. A movable ring is connected to the movable blade unit and includes a flange, an outer collar and the inner ring, wherein the flange is connected to the outer collar which is rotatably connected to the inner ring. The inner ring is mounted to the rotating shaft and a gap is defined between the inner ring and the rotating shaft. The inner ring includes multiple sets of rotating members which are in contact with the grooves in the rotating shaft so that the inner ring is rotatable and movable relative to the rotating shaft with little or reduced friction.

Abstract: A finger joint cutter is provided that inhibits occurrence of a blow out or a rip out and has a good cutting accuracy. The finger joint cutter is provided with a plurality of blade array groups 44a to 44d made of a plurality of cutting blades 14 aligned at a predetermined pitch L along a rotary shaft R to shave joint fingers by allowing the cutting blades 14 to cut into an end portion of a material to be cut at the same time. The cutting blades 14 are constituted from either a main blade 46 or an auxiliary blade 48. A rake face 50 of the main blade 46 is formed in an angle shape being tapered off towards an outer diameter. A width dimension l1 of a rake face 54 of the auxiliary blade 48 parallel to the rotary shaft R is set to be smaller than a width dimension l2 of the rake face 50 of the main blade 46 parallel to the rotary shaft R. The pitch L is set to be not less than the width dimension l2 of the main blade 46.

Abstract: The present invention includes a cutting wheel device for grinding materials, the cutting wheel comprising a plurality of discrete plates mounted on an axle and cutting heads positioned between the plates. The cutting heads having a portion extending beyond the periphery of the plate. Secondary cutters are attached to the cutting head to project over an adjacent discrete plate for keeping debris from lodging between adjacent cutting heads.

Abstract: Systems for orienting strands and/or other types of particles are provided. The systems may have tabs which extend from orienting disks and/or collars and/or spacers which may be disposed on shafts. The tabs may prevent accumulation of strands between disks utilized within an orienting system. For example, the tabs may contact strands and/or other particles and guide or force the particles to be moved past the disks toward successive disks, or onto a screen or conveyor line.

Abstract: A device for adjusting a sawing device's width, wherein the sawing device comprises at least two circular blades 10, 12, facing each other and adjacently positioned, and a fastener 44 adapted to assemble the blades together. The device for adjusting the sawing device's width comprises a wavy annular spring 14 provided between the blades, a recess 42 provided in each of the blades, wherein the recesses are positioned opposite to one another and wherein said wavy annular spring is received within the recesses, an adjustment member 32 adapted to force the blades together against said wavy annular spring or to part them so as to maintain a predetermined distance between the blades. The distance between the blades is set to present a desired cutting width.

Abstract: An apparatus having adjustable saws for wood cutting. A cutting head has at least two spaced apart disk-saws for producing respective slicing cuts in an article of wood, the saws defining respective distinct outer cutting diameters. Preferably, the disk-saws are bolted to the cutting head and spaced apart therefrom adjustable amounts by interdisposed control plates of predetermined thicknesses. Preferably, a first one of the disk-saws defines an annular ring having an inner diameter, and the outer cutting diameter for the first disk-saw is greater than the outer cutting diameter of a second one of the disk-saws. The outer cutting diameter of the second disk-saw is then less than the inner diameter of the first disk-saw, so that the second disk-saw is nested inside the first disk-saw while remaining axially displaceable therefrom.

Abstract: A scuffing device (30) arranged to impart texture to a plastic pallet surface (12) having a plurality of cutting members (34) axially aligned and mounted adjacent each other, the cutting members (34) having radial toothed edges for cutting into and imparting texture to the plastic pallet surface upon rotating engagement therewith. The device further having a shaft upon which the cutting members are mounted for providing rotational movement to the cutting members.

Abstract: A deburring tool includes a proximal cutter and a distal cutter which form a V-shaped groove within which a workpiece is positioned to remove burrs from both sides of the workpiece simultaneously. The cutting edges of the proximal and distal cutters do not include any under cuts and therefore can be formed using a powdered metal process.

Abstract: A gang blade assembly which controls the trajectory of detritus from a ball grid array substrate dicing operation is described. The assembly includes a cover which partially encases a hub with a plurality of blades. A brush is mounted on the cover to disrupt an air flow created by rotation of the hub and blades. The brush extends beneath the cover and has bristles which contact the hub. The bristles also serve to clear the hub of any detritus produced during dicing. More than one brush may be mounted on the cover.

Abstract: A scuffing device (30) arranged to impart texture to a plastic pallet surface (12) having a plurality of cutting members (34) axially aligned and mounted adjacent each other, the cutting members (34) having radial toothed edges for cutting into and imparting texture to the plastic pallet surface upon rotating engagement therewith. The device further having a shaft upon which the cutting members are mounted for providing rotational movement to the cutting members.

Abstract: A knife holder is provided which can be readily disassembled and maintained while remaining in a knife bank. Fasteners keep the cylinder housing and blade housing securely connected and are aligned parallel to the longitudinal axis of the knife holder for easy access while in the knife bank. The fasteners can be removed using a manual driver without the necessity of removing the knife holder bank from the web equipment.

Abstract: An adjustable profiling head for a wood cutting apparatus. There is a first body portion for carrying a plurality of first knives and a second body portion for carrying a plurality of second knives. The cutting edges of the knives define respective cutting surfaces of revolution about an axis that have different mean diameters for the two body portions. In one aspect of the invention, the body portions are adapted to receive the respective knives by associated knife clamping mechanisms that are adapted to be removably mounted to the body portions with one or more first control plates therebetween, for adjusting the radial positioning of the knives. In another aspect of the invention, the body portions are adapted to be removably mounted to each other so that the body portions are disposed axially adjacent one another with one or more second control plates therebetween, for adjusting the relative axial positioning of the knives of one of the body portions with respect to the knives of the other body portion.

Abstract: The invention relates to a device and method for making tenons using an adjustable shim placed between cutting blades. The adjustable shim has a plate with a recess capable of accepting spacers of varied thicknesses and a cover that encloses any of the spacers placed in the recess. The thickness of the adjustable shim is adjusted by placing spacers in the recess to shim apart the cutting blades leaving between them a distance approximately equal to the desired tenon thickness.

Abstract: A saw that uses an extension arbor that fits over the existing arbor to hold a dado blade. The extension arbor is held in place by a locking bolt that passes through a bushed brace that is secured to the guard. In this way, both ends of the extension arbor are supported, providing strength and stability of the saw. The saw has a larger base plate and guard to accommodate the wider blades. Any type of standard dado blade may be used with the extension arbor.

Abstract: In a timber incising machine incorporating a shaft mounted rotating incisor drum, an improved incising drum comprising a shaft configured for rotation by the incising machine; a plurality of circular incisor plates, each of the incisor plates having a plurality of equally spaced incisor teeth extending radially from the radial edge of the circular incisor plates at a desired location. A plurality of incisor plates are stacked in a desired quantity and positioned to place the incisor teeth in a desired pattern and fixed together to form a plate array as a single unit. A plurality of the plate arrays are mounted on the shaft so as to form a rotatable drum having a plurality of radially extending incisor teeth positioned in a desired pattern.

Abstract: A shaft assembly including an inner hub having a centrally-disposed bore therethrough and an outer surface for carrying a first member concentrically thereon for rotation therewith, an outer hub having a centrally-disposed bore therethrough and an outer surface for carrying a second member thereon for rotation therewith. The bore of the outer hub is adapted for receiving the inner hub concentrically therein for rotation therewith. An outer pressure-expansible sleeve is provided for being concentrically-mounted within the bore of said outer hub and pressurized for locking the outer hub onto the inner hub. An inner pressure-expansible sleeve is concentrically-positioned in the bore of the inner hub and pressurized for locking the inner hub onto a rotatable spindle, whereby the inner hub and outer hub and the respective members mounted thereon are locked in fixed, concentric relation relative to each other and to the rotatable spindle.

Abstract: A trim saw is mounted in conjunction with a hogger, or device for reducing scrap to particles, or saw dust. The hogger is made up of a any desired number of units that will reduce scrap to sawdust. Each unit has a pair of oscillator plates that hold a pair of semicircular blade portions at an angle to the axis of rotation, so the blade portions sweep a wide kerf. Since the blades are generally conventional saw blades, they can be sharpened by conventional machines, obviating the need for hand sharpening. Also, the relatively fine teeth on the hogger blades allows substantially uniform power loading for uniform operation.

Abstract: A matched pair of two rotatable cutting tools (bits) is adapted to be individually chucked into a common router. Each of these two cutting tools includes a shaft with a removable nut, two or three cutters, one or two bearings, and suitable shims. A first bit has cutters shaped to remove material from the edge of a planar wooden article such as plywood that requires a finished appearance, to form a preferably rounded concave dado in the plywood edge. A second bit has cutters shaped to form a mating wood insert having a preferably rounded convex shape that matches the contour of the concave dado in the plywood edge. The mating wood insert is glued into the dado in the plywood to complete the finished edging.

Abstract: A device for consolidating compositions contained in partially filled dual chamber dispensing cartridges includes a body having a pair of passages, and first and second couplers for connecting the body to first and second dual chamber dispensing cartridges. Once the device is connected to two cartridges, an applicator is connected to one of the cartridges and is used to expel any remaining compositions in such cartridge to chambers of the other cartridge. The contents of several partially empty cartridges can be consolidated in this manner so that a subsequent dispensing operation need not be interrupted to replace cartridges.

Abstract: A blade arrangement for cutting dados that includes magnetic dado spacers, which firmly adhere through magnetic attraction to the dado blades, is disclosed. Also, with the blade arrangement of the present invention, problems due to blade vibrations are reduced. The cutting width is conveniently measured and adjusted without having to repeatedly install and remove the nut, since the magnetic dado spacers hold adjacent blades firmly together, before they are tightened. Additionally, the use of magnetic dado spacers reduces the possibility of the spacers falling into and becoming caught in the thread of an arbor. A further advantage is that the magnetic dado spacers are much quicker and easier to install than prior art dado spacers.

Abstract: A magnetic dado shim is a disc cut from highly flexible magnetic sheeting, and includes a central arbor hole. When the magnetic dado shim is placed concentrically on a steel dado blade, it sticks securely thereto, and will not easily shim in position. Therefore, the magnetic dado shim will not fall into the thread of an arbor and become damaged when the dado set is tightened thereon. Accordingly, the magnetic dado shim is very easy to install.

Abstract: An adjustable dado having the adjustment ease of a wobble type dado with the cut quality of a stacking type dado. The outer cutting blade is bored and threaded, and a threaded adjusting collar is threaded into the outer blade. An adjustment washer has pins to engage openings in the adjusting collar, so that rotation of the adjustment washer adjusts the position of the outer blade. The invention allows quick and easy adjustment of a stacking dado without removal of the dado blades.

Abstract: A multiple saw blade adjustable dado cutter assembly. The cutter can be used with a table saw or a radial arm saw, for example, to make dado cuts in board lumber. A pair of cooperating cams, each connected to a saw blade, can be adjusted to make a dado cut of a desired width. If the desired dado width is wider than the two blade configuration can cut, a center cam attached to another blade can be inserted between the pair of cooperating cams. With the three blade configuration, the three cams cooperate to allow the three blades to be spaced for the desired width of cut. In both configurations and at any spacing width, the two or three blades employed remain in a generally parallel alignment and transverse to the axis of the arbor on which the assembly is secured. To permit the blades to function with this geometrical relationship and to be adjustable, not all of the blade teeth lie in the same plane. The sequentially operating three or more cam assembly has uses beyond dado cutting.

Abstract: A fastening system for a rip saw blade and chipping edger combination includes at least one rip saw blade provided with holes and at least one chipping edger mounted collinearly and adjacent to the rip saw blade on a turning arbor so that the teeth of the chipping edger is aligned with the holes provided in the rip saw blade. The rip saw blade, the chipping edge and the turning arbor are all held stationary relative to each other by anchoring the same on the turning arbor with a fastening device such as a nut. An intermediate space or recess is provided between the rip saw blade and the chipping edger to permit the rip saw blade to yield in either lateral direction.

Abstract: A debarker head for use in a rotary tree debarking machine has a drive shaft with a polygonal cross sectional shape and a plurality of substantially similar cutting elements with mounting apertures corresponding to the drive shaft shape and sized for slip fit engagement of the cutting elements on the drive shaft so that the cutting elements may be mounted to the drive shaft at a number of rotational positions relative to the drive shaft. Further, the cutting elements have a plurality of arms with cutting knives. The number of arms of at least some of the cutting elements is not an integer multiple of the number of sides of the mounting aperture so that a variety of cutting knife arrangements for debarking various species of logs using the same head may be obtained by adjusting the rotational position of the cutting elements relative to the drive shaft. This design of debarker head can be repaired in the field.

Abstract: A debarker knife assembly is disclosed including a plurality of disks rotatably and drivingly carried on a shaft. The disks have cutting teeth on their circumferences and are co-rotated on the shaft to remove the bark from a log as the log advances and rotates past the rotating debarker knife assembly. The disks are interchangeable and readily assembled or disassembled for repair or replacement. The cutting teeth are provided with replaceable, reversible cutting inserts fixed to the leading faces of the teeth.

Abstract: An indexable slot cutting tool for narrow widths having both head and base members with adjacent opposed cutting faces. An axially oriented sleeve with right hand differential pitch threading engages the head and base members to effect axial movement of the cutting faces for slot adjustment.

Abstract: A tool for use in a groove mill to simultaneously form spaced grooves in the interior surface of a bore with the tool including a shank and a pair of heads mounted thereon in spaced relation and in a detachable, non-rotative manner. Each head includes a plurality of insert pockets and inserts secured therein by screw threaded retainers and notches in one head aligned with the screw headed retainers for the inserts in the opposite head to enable indexing of the inserts without disassembly of the heads.

Abstract: A woodworking machine to form finished dimensional lumber from cants by a single pass of the cants through the machine and comprising compression and feed rollers above and below a longitudinal path and parallel longitudinally offset arbors respectively are mounted above and below the path upon which spaced saw blades are mounted with opposed blades in common planes and of diameters adequate to form complete cuts through a cant during a single pass, the arbors also supporting between the blades additional cutters to plane the edges of the dimensional lumber and form rounded edges thereon.

Abstract: A shredder structure, components, and sub-combinations thereof, useful for shearing, shredding, and/or chopping a variety of materials such as municipal and industrial solid waste products, vehicle tires, and other materials desired to be comminuted. The hopper of the structure is preferably hinged to provide easy access to the made-up shaft. The shaft carries a series of rotating bladeholders keyed to the shaft and provided with radial protrusions and contiguous slots accommodating fitted-blade placement. The rotating bladeholders are spaced apart by spacers which serve not only to mutually space the rotating bladeholders, but also to support the sides of the rotating blades so as to form with the bladeholder slot pockets or seats for such blades. Particular support structure is used for the stationary blade employed, with which the individual rotating blades on each bladeholder co-act.

Abstract: Apparatus for eradicating tree stumps comprising a rotary cylinder or drum having knives or teeth around its periphery. The teeth include both cutter teeth and chipper teeth. The primary purpose of the chipper teeth is to hog out and remove the fibrous wood material. The primary purpose of the cutter teeth is to break up and cut or slit the fibers so that they may be more easily hogged out by the chipper teeth.

Abstract: A wood incisor for perforating the surfaces of a rectangularly cross-sectioned elongate board preparatory to preservative treatment is comprised of sets of paired horizontal and vertical drums arranged in a manner to provide a rectangular passageway of adjustable height and width for passing various sized boards, with each drum having a plurality of outwardly protruding cutting teeth. Each set of drums includes a fixed drum which is driven, and an idler drum which is slideable with respect to its associated fixed drum by actuation of positioning hydraulic cylinders to provide the adjustability of the passageway therebetween. Each of the positioning hydraulic cylinders is joined end-to-end with a cushioning hydraulic cylinder which is connected hydraulically to an accumulator tank containing pressurized hydraulic fluid and air. Thus the position of each idler drum relative to its associated fixed drum is responsive to the lateral force imparted to that set of drums by the board passing therebetween.

Abstract: A stacked disc cutter assembly for producing finger joints including a plurality of discs, each of which has a plurality of cutter teeth secured to and projecting radially outwardly therefrom. The discs are of substantially similar outer diameter and when assembled and secured together in side-by-side, contiguous, concentric relationship they form a solid cylindrical core for the assembly. The cutter teeth projecting radially outwardly from the discs and so arranged on the discs that they are spaced apart both axially and circumferentially of the cutter assembly. SUBACKGROUND AND SUMMARY OF THE INVENTIONThis invention relates to a stacked disc cutter assembly for producing finger joint cuts in material, and more particularly to such a stacked disc finger joint cutter assembly wherein cutter teeth thereon are spaced apart both axially and circumferentially about the assembly.In the past, various types of cutter devices have been designed for producing finger joints in material such as wood.

Abstract: Apparatus for eradicating tree stumps comprising a rotary cylinder or drum having knives or cutters around its periphery. The cutters are mounted on rings which encircle the drum. The rings have circumferentially spaced mounting surfaces which are staggered relative to one another so that the cutters when secured to the mounting surfaces are themselves staggered for more effective cutting action. The drum is supported by two rotary hydraulic and/or electric motors having aligned output shafts which are connected to the ends of the drum to support and also to rotate it. The motors are carried by the arms of a yoke. Instead of two motors, there may be a motor at one end of the drum and a bearing at the other.

Abstract: A rotary cutter knife in which a body is provided which is made up of coaxial discs in adjacent relation. Each disc has cutting edge portions distributed about the periphery thereof and in one relatively rotated position of the discs the cutting edge portions align in the axial direction thereby positioning the cutting edge portions for easy sharpening. In another rotated position of the discs, the cutting edge portions are staggered and the cutting load on the cutter knife is thereby distributed circumferentially during working operations of the cutter knife. Cooperating elements of keying means are provided for keying the discs in the two relatively rotated positions thereof.