Abstract: A controller that controls a machine tool, a method of controlling a machine tool, and a computer program that causes a computer to operate as a controller that controls a machine tool, the machine tool comprising multiple control axes and used for machining by cutting of a work as a machining target by means of coordinated motion of the control axes. The method includes acquiring a position command for driving a cutting tool or the work, acquiring a rotation speed of the rotated cutting tool or the rotated work, calculating oscillation amplitude, calculating an oscillation frequency, calculating an oscillation command for causing the cutting tool and the work to oscillate relative to each other, storing a command route, correcting the oscillation command based on the stored command route, determining a drive signal to be used for driving the servo motor, and outputting the drive signal.

Abstract: The transporting roller (1) has teeth (6) arranged in a distributed manner over the circumference. To allow a high advancing force to be achieved with the transporting roller (1) at the same time as an only low pressing force over a long operating time and service life, at least some of the teeth (6) comprise a main tooth (7) and at least one secondary tooth (9), which is arranged at a distance from the main tooth and has a smaller tooth tip radius (r2) than the main tooth (7). With the secondary teeth (9), there is an additional transfer of force exerted on the workpiece (2). The secondary teeth (9) limit the depth of penetration of the main teeth (7). When there is a high pressing pressure, the secondary teeth (9) penetrate partially into the work-piece (2). The main and secondary teeth (7, 9) penetrate only slightly into the workpiece (2), and so only a small amount of material has to be removed to eliminate any markings.

Abstract: A portable grinder unit includes a plurality of grinder heads for rending waste debris. A pair of side grapple arms are independently movable between a receive position and a feed position. A top grapple arm is movable between a receive position and a feed position. The grinder unit is mountable to a support vehicle and can receive mechanical power from the support vehicle.

Abstract: A knife and knife assembly for a planer side head. An L or an LV type side planer head is retro-fitted with knives having substantially less mass than the knives originally provided for these heads.

Abstract: A sharp edged knife stop can secure the position of knife blades in a cutting or chipping system and prevent the separation of knife blades. The sharp edged knife stops can also assist in the cutting or chipping and lower the amount of debris build up that would occur with the use of traditional knife stops. The sharp edged knife stop has the same inclination angle as the knife blades and the same difference in knife edge height as the knife blades above that of a retaining ring height.

Abstract: A clamping assembly to hold a woodworking knife in place in a woodworking machine. The clamping assembly comprises a clamping component comprising a body and an actuator. The body has three discrete contact positions distributed thereon: 1) a fulcrum located generally at one end, 2) a knife abutting portion located generally at the other end, and 3) a bearing surface located elsewhere. The actuator is for applying a clamping force to the body along a clamping axis located intermediate of the knife abutting portion and the fulcrum. The fulcrum is a surface having a normal that is at an angle to the clamping axis. The bearing surface is a surface wherein a line normal to the bearing surface intersects the line normal to the fulcrum at a position outside of the clamping component at a location farther askew of the clamping axis than the fulcrum.

Abstract: A knife and knife assembly for a planer side head. An L or an LV type side planer head is retro-fitted with knives having substantially less mass than the knives originally provided for these heads.

Abstract: The concept of using a cutting element proximate the end of an excavator or similar device, along with the concept of using a cogged belt pulley configuration, an overhead load adaptor, a single- or multiple-pivoting drum configuration, and other concepts disclosed herein. The present invention also provides an improvement of the prior art by providing a chipping action, which is according to the present invention an improvement over prior art shredding configurations.

Abstract: Apparatuses, methods, and systems for producing wood chips are disclosed. The disclosure in one embodiment produces smooth wood chips of generally uniform size and shape, suited for use in making paper, cardboard, and other recyclable materials. In one embodiment, an apparatus is disclosed for collecting, aligning and guiding wood scraps through an array of spaced-apart saw blades using a feeder assembly operating on a continual basis. The feeder assembly in one embodiment includes one or more paddle assemblies shaped to align and guide the wood scraps along a feeder path toward the saw blades. A system for controlling an apparatus is also disclosed. A method for reducing wood scraps into cut chips is also disclosed.

Abstract: The invention concerns a method for clamping a knife of a disc chipper, wherein the knife is pressed from the knife disc via knife a clamp against a wear plate in a diagonal position (?) with respect to the plane of the knife disc with a compressive force (N) substantially parallel with the axis of the knife disc. According to the invention, the compensating force of the force directed to the knife clamp, caused by the diagonal position (?) of the knife and transversal to the compressive force (N) is exerted to the wear plate.

Abstract: A comminuting machine rotor assembly comprising rotors carried by a shaft for conjoint rotation with the shaft, hammer heads carried by the rotors and extending radially outwardly from the shaft, and hammer inserts releasably attached to respective ones of the hammer heads. There is a wear material coating over at least a first cutting edge of an insert body of each insert. The first cutting edge of each insert body is defined by a front facet generally facing the direction of assembly rotation, a radially outer end facet adjacent the front facet, and an intervening radially distal corner of the hammer insert formed at the intersection of the front and end facets. The front and end facets are disposed at a relative angle of greater than 60 degrees to one another.

Abstract: An assembly for processing wood chips has a rotatable drum with a plurality of blades circumferentially spaced from one another fed by a feed chute assembly. The feed chute assembly comprises a moveable element mounted so as to be dynamically moveable between a first position and a second position. The feed chute assembly may include a downwardly angled feed chute and a redirecting wall disposed downstream thereof. The moveable element may be all or part of either or both of the main chute and the redirecting wall. Wood chips are directed toward the rotating drum at a rotational position that varies depending on the position of the moveable element. The wood chips fed to the drum are flung therefrom in a pattern that varies in a side view along the axis depending on the position of the element. There may be multiple moveable elements.

Abstract: A knife assembly for a chipper, which is intended to be installed in the knife frame includes a counter knife, a reversible knife including two cutting bevel edges, and a clamp. In addition, the knife assembly includes securing devices for securing the clamp and at least one locking piece running parallel to the longitudinal axis of the reversible knife to prevent lateral movement of the reversible knife relative to the counter knife. The reversible knife, the counter knife, and the locking piece are arranged in such a way that the position of the reversible knife relative to the knife frame can be set as desired. The locking piece is also arranged to form a fixed part of the reversible knife or the counter knife, and the counter knife is fitted to the knife frame using shape-locking.

Abstract: An apparatus for comminuting materials includes a rotating or stationary ring of knives that is arranged around a chipping chamber. The ring of knives is has a plurality of knife carriers, which are distributed around the knife ring axis in a circular shape, each knife carrier having a bearing surface. The bearing surface is a receptacle for a knife package that is comprised of a knife retaining plate and a slicing knife, and which is held in an operational position at a predetermined angle and a predetermined blade projection by fasteners. The knife carrier has a reference surface, which interacts with the knife package, and based on which the blade projection is determined. The slicing knife has at least one recess that originates in a rearward longitudinal edge, whereby the reference surface is arranged on the projection inside the recess, the projection extending vertically to the bearing surface.

Abstract: The invention relates to an intermediate product, a method for processing the intermediate product and a wood chipping device for processing the intermediate product. The intermediate product is substantially rod shaped and is sized in a range that includes between one and two times as oriented strand (OS) chips. The intermediate product is fed to a wood chipping device. The wood chipping device has a number of blades. The number of blades each have a number of cutting edges that run parallel to a blade ring axis, and which enclose a working chamber. The intermediate product is rotated about the blade ring axis and is aligned in such a way that it lies substantially parallel to the blade ring axis and is pressed by centrifugal force against the cutting edges.

Abstract: A rotary cutter of a wood planing machine includes: a rotary shaft that has alternately disposed fan-shaped vanes and fan-shaped grooves; and blades secured respectively to the fan-shaped vanes. Each of the fan-shaped vanes has a leading face and a trailing face. Each of the blades is attached securedly to the trailing face of the respective fan-shaped vane. The leading face of each of the fan-shaped vanes and the trailing face of an adjacent one of the fan-shaped vanes converge toward a center portion of the rotary shaft so as to define a respective one of the fan-shaped grooves, and cooperatively define an angle therebetween. The angle is greater than 60 degrees and less than 120 degrees.

Abstract: A two-part blade support base for mounting a chipper knife to a chipper disc wherein the parting line between the upper part and lower part is substantially parallel to a plane defined by the chipper disc. The parting line incorporates a vertical step which transmits shear forces which would cause the upper part to move outwardly of a chip receiving surface. A screw or bolt connects the upper and lower parts of the blade base. The upper part of the blade base may be constructed of a wear resistant material.

Abstract: A knife and apparatus for clamping the knife. The knife has front and back sides that, preferably, both include interlocking features adapted for interlocking engagement with corresponding inner and outer clamping members, to prevent slippage of the knife from the clamping members in orientations wherein the knife rests thereon in the chipping apparatus when the knife is unclamped. Preferably, the interlocking feature of the back side of the knife includes a semi-cylindrical groove, and the interlocking feature of the front side of the knife includes two spaced-apart deflector ridges. Preferably, the interlocking feature of the outer clamping member is a projection having a semi-cylindrical tip portion wherein the semi-cylindrical shape is preferably half-cylindrical, and wherein the projection extends from an inner surface of the outer clamping member sufficiently far that most of the back side of the knife does not make contact therewith.

Abstract: The invention is a planing cutter with a cylindrical cutter body (1) with recesses (3) along its enveloping surface. Each recess is delimited by a front wall (4), a rear wall (5) and a bottom (6) and contains a cutting element (7). Each cutting element (7) has a cutting edge (8), a lower edge (9), two lateral edges (10,11), a front face (12) and a rear face (13). One clamping device (2) is also located in each recess. According to the invention each lateral edge (10,11) of the cutting element (7) has a range (14) of grooves. At least one groove in each range interacts with a peg (17,18) protruding from one of the walls (4,5) of the recess (3). The invention also concerns a cutting element (7) for use with the cutter of the invention.

Abstract: A comminuting unit of a comminuting machine for comminuting material has a plurality of knife carriers with a longitudinal axis. The knife carriers are arranged along a comminution path of the comminuting unit and have a leading longitudinal edge. The knife carriers are aligned with the longitudinal axes transversely to the comminution path and parallel to one another. The knife carriers have an axis-parallel slicing knives arranged at the leading longitudinal edge. The slicing knives have a cutting edge extending at a predetermined angle and a predetermined projecting length into the comminution path. Axial passage slots are formed between the knife carriers allowing passage of material comminuted by the slicing knives such that a rearward longitudinal edge of a preceding knife carrier and the slicing knife of the following knife carrier together define the axial passage slot in the form of a guide channel.

Abstract: There is provided a rotatable cutting tool for supporting at least one knife in at least two alternate angular cutting configurations. The cutting tool includes a body that defines at least one cavity extending generally in a longitudinal direction of the body. Each cavity is defined by first and second knife support surfaces, which are provided in an opposing, non-parallel configuration. The first knife support surface is configured to support one of the knives that is urged against the first surface at a first hook angle, and the second knife support surface is configured to support one of the knives that is urged against the second surface at a second hook angle, which is different from the first hook angle.

Abstract: A device for comminuting material includes a plurality of knife carriers arranged along a comminuting path, wherein each knife carrier has a receiving unit with a stop for a knife bundle. The knife bundle is held in a position of operation in the receiving unit, wherein each knife bundle is composed of a knife support plate and a chipping knife. The knife support plate and the chipping knife are connected to each other so as to overlap in a transverse direction in a plane of the knife support plate. The knife support plate has at a longitudinal side thereof facing the stop of the knife carrier at least one stop surface, wherein the stop surface is adjustable in the transverse direction of the knife support plate.

Abstract: A ring slicer with easily removable knife and knife assembly. According to one aspect of the invention, a ring assembly comprises two end plates for rotation about an axis of rotation. Each of the knife assemblies comprises an elongate knife having a cutting edge extending along an elongate axis, a base, and a clamp for clamping the knife to the base. The knife assemblies are adapted for installation between the end plates such that the shoulder portions of at least two shoulder bolts extend through one of the end plates into the base.

Abstract: A ring slicer having an easily removable knife and knife assembly. Within the scope of the invention, there is an apparatus for cutting an article of wood, comprising a ring assembly comprising two end plates and a plurality of knife assemblies. Each knife assembly comprises a knife, a base, and a clamp for clamping the knife to the base. The assemblies are provided for installation between the end plates. According to one aspect of the invention, the bases include one or more first apertures and at least one of the end plates includes a corresponding set of one or more second apertures therethrough for receiving respective dowel pins. The first apertures are adapted to snugly slidingly receive the respective dowel pins. According to another aspect of the invention, for each knife assembly, the clamp includes an upper clamping member that is mounted to the base so that a portion of the upper clamping member is cantilevered from the base.

Abstract: The present invention relates to a method for reconditioning after rehardfacing the wear plates that are used on the mounting face of the knife disc of a disc chipper so that the original dimensions of the wear plate are substantially restored and further to a wear plate reconditioned in accordance with the method. According to the invention, the rear side (9) of the wear plates is machined to incorporate at least one additional groove (14; 14′, 19) and into the grooves (12 and 14; 14′, 19) made on the wear plate rear side are affixed machining allowance strips (16, 17), whereupon the allowance strips can be machined as required to restore the thickness dimensions of the wear plate.

Abstract: The invention relates to an intermediate product, a method for processing an intermediate product and a wood-chipping device for processing an intermediate product. The intermediate product (20) is substantially rod-shaped and is between one and two times as long as oriented strand (OS) chips. The intermediate product is fed to a wood-chipping device comprising a large number of blades (4), whose cutting edges run at least approximately parallel to the blade ring axis (2) and which enclose a working chamber. The intermediate product is rotated about the blade ring axis and is aligned in such a way that it lies substantially parallel to said ring axis and is pressed by centrifugal force against the cutting edges of the blades.

Abstract: An apparatus for slicing elongate fibrous material has a slicing device having an axis of rotation about which the slicing device rotates during operation. The slicing device has slicing tools with a blade carrier and a blade unit. The blade units have cutting blade edges that together define a common cutting surface. The elongate fibrous material is fed in slicing cycles in the direction of its longitudinal extension to the blade units. Slicing is carried out parallel to the fiber orientation by realizing a relative movement between the elongate fibrous material and the blade units transverse to the fiber orientation. The slicing tools have an end face with a receptacle extending parallel to the end face. The slicing tools have a cutting element arranged in the receptacle. The cutting element performs a separating cut in a direction transverse to the fiber orientation in the separating plane between two slicing cycles.

Abstract: An improved method and apparatus which cuts certain wood pieces, commonly referenced as “mill ends,” such that the chips can be used to make paper, cardboard and other recyclable materials. The use of a horizontal drum in combination with a horizontal anvil and a “moving cavity” which orients elongate elements, is likewise contemplated.

Abstract: An apparatus for slicing elongate fibrous material has a slicing device having an axis of rotation about which the slicing device rotates during operation. The slicing device has slicing tools with a blade carrier and a blade unit. The blade units have cutting blade edges that together define a common cutting surface. The elongate fibrous material is fed in slicing cycles in the direction of its longitudinal extension to the blade units. Slicing is carried out parallel to the fiber orientation by realizing a relative movement between the elongate fibrous material and the blade units transverse to the fiber orientation. The slicing tools have an end face with a receptacle extending parallel to the end face. The slicing tools have a cutting element arranged in the receptacle. The cutting element performs a separating cut in a direction transverse to the fiber orientation in the separating plane between two slicing cycles.

Abstract: A method and apparatus for reducing the size of wood members, particularly pan-shaped wood members known in the industry as “lilypads”, such that the orientation of the fibers of the lilypads are encouraged to be substantially perpendicular to the longitudinal and rotation axis of a cutting drum having a plurality of cutting members extending from its circumferential surface.

Abstract: A process is disclosed for cutting logs to form large-surface wood chips, in which, on the one hand, a rotating knife ring provided with cutting knives which are oriented parallel to its axis of rotation and, on the other hand, a quantity of logs which are likewise oriented parallel to the axis of rotation of the knife ring are moved toward one another and the logs are cut. A device for carrying out this process is also disclosed. In a device of the type mentioned above, the movement of the knife ring directed to the logs and/or the movement of the logs directed to the knife ring is carried out on a curved path at least during the cutting process. In this way, individual chip sectors are “compressed”, while others are “expanded” in such a way that there is a greater proportion of chips whose quality lies within the predetermined tolerance.

Abstract: A log flaking and loading method and apparatus. First and second pairs of cutting heads have cutting heads spaced apart to receive a log passed therebetween and thereby to cut two substantially parallel sides. The log is first cut by the first pair of cutting heads, rotated about its elongate axis, and cut by the second pair of cutting heads to produce a four-sided cant. The logs are preferably stored ahead of the first pair of cutting heads in corresponding carriers, which are preferably held in a magazine for dispensing the loaded carriers.

Abstract: A system for converting wood products into viable base construction materials consisting of a support structure, a central structure consisting of a low speed, high torque, hydraulic motor which drives a central drive shaft to which a planing table is rotatably attached. Four or more feed chutes are radially attached to the outer supports and the logs are sliced over eight blades arranged on the planing table. An alternative embodiment consists of a rotary cutting device where logs are fed to cutting blades rotating below.

Abstract: An improved wood pulverizer is provided with a rotating disc studded with a plurality of curved tapered hammers. One or more anvils is secured to the pulverizer with the anvil having teeth and slots located adjacent the surface of the disc. The hammers of the rotating disc pass through the slots of the anvils as the disc rotates to tear and shard wood into bits and pieces for subsequent use or processing. The anvils of the present invention are formed with two or more useable surfaces so that the anvils can be removed, rotated, and replaced to present fresh cutting surfaces to the disc. Further, the anvils are formed by a series of bolted together anvil segments to allow replacement of only single segments in the event of damage. Improved chip sizing grates are also provided with the grates having replaceable reversible gullet liners and grate rings formed by ring segments that together define a grate liner. Rotor rings are provided in some embodiments.

Abstract: A method and apparatus for reducing the size of wood members, particularly pan-shaped wood members known in the industry as "lilypads", such that the orientation of the fibers of the lilypads are encouraged to be substantially perpendicular to the longitudinal and rotation axis of a cutting drum having a plurality of cutting members extending from its circumferential surface.

Abstract: A drum assembly for a wood chipper includes a drum rotatable about a horizontal axis and a plurality of pockets disposed circumferentially about the drum. The drum assembly also includes a plurality of blades operatively connected to the drum, one of the blades partially overlapping one of the pockets. Each of the pockets has a depth greater than a width thereof and a capacity to hold a wood volume of a maximum size of wood being chipped.

Abstract: A method and apparatus for reducing the size of wood members, particularly pan-shaped wood members known in the industry as "lilypads", such that the orientation of the fibers of the lilypads are encouraged to be substantially perpendicular to the longitudinal and rotation axis of a cutting drum having a plurality of cutting members extending from its circumferential surface.

Abstract: A chip slicer has pivotably mounted chip-forming knives located so that the knife edges are in a plane which passes through the axis of rotation of the knives, as well as through the axis of pivoting. Another improvement is to employ a knife which has a blade which is bent at an obtuse angle to form a first and a second leg. The first leg has a cutting edge and an upper surface which defines a chip path. The second leg is bent with respect to the first leg in the direction of rotation of the knife ring. The knives are mounted to the ring by clamping wedges which are bolted to the knife ring so that they overlie the second leg and so clamp the knife blade by the second leg to thereby substantially remove obstructions from the chip path. A further improvement has chip depth gauges which are positioned in front of the knife edges. The depth gauges have trailing edges in the direction of rotation which extend substantially parallel to the upper surface of the blades.

Abstract: The invention relates to a knife assembly for slicing woodwool, comprising a knife with a chip surface (1), a clearance surface (2) and a cutting edge (3), defined by the intersection between both surfaces. The knife assembly is characterized by guiding ribs (4) extending perpendicularly to the cutting edge (3) and joining the chip surface (1) with an end (5) that substantially coincides with the cutting edge (3) and with the guiding surface joining said end and rising there towards. The guiding ribs (4) can be formed integrally with the knife.

Abstract: The present invention provides a replaceable insert cutting tool combination. The combination comprises a cutter head having at least one peripheral transverse indentation and being rotatable about an axis, the cavity including a knife support wall at least partially transverse to the cutter head periphery, and at least one threaded bore substantially parallel to the knife support wall. The combination further comprises a knife element disposed adjacent the knife support wall and having an edge extending from the indentation, in addition to at least one threaded element for engagement in the threaded bore. At least a pair of wedging elements are mounted adjacent the knife element in engaging side-by-side relation in the indentation.

Abstract: An interchangeable chipper tool attachment for a hog allows a hog machine to operate as either a hog or a chipper. An operator of the hog machine can remove hammer tools used in the hog and replace them with the chipper attachment. The chipper attachment includes knife receiving area, a knife support receiving area, and a fastener portion for mounting the tool holder to rotor disks on the rotor assembly of the hog machine. A knife assembly, including a chipper knife, is coupled to the tool holder at the knife receiving area and points in the direction of rotation of the rotor. A knife support block supports the chipper knife and is coupled to the tool holder at the knife support receiving area, a lateral face of the tool holder adjacent to the knife receiving area. When mounted in an interleaved fashion between the rotor disks of the rotor assembly, the chipper knife rotates in a circular path and produces chips by cutting wood waste against an anvil on the hog.

Abstract: Wood wafers are produced by feeding logs to a rotary cutter head drum with the longitudinal axis of the logs disposed substantially parallel to the rotational axis of the drum. The drum mounts a plurality of wafer cutting head units arranged in a V-shaped pattern with the apex of the V trailing the base thereof and with the cutting blades defining the ends of the base positioned at the opposite ends of the operative length of the drum. Each wafer cutting blade having a cutting edge disposed substantially parallel to the axis of the drum and offset circumferentially and axially from an adjacent cutting blade so that the cut produced by a cutting blade overlaps the cut produced by the next adjacent preceding cutting blade.

Abstract: A drum chipper for chipping wood material includes a chipping drum having a blade mounted at an opening formed through a circumferential surface of the drum. The drum includes an internal conical surface positioned for a chip to flow radially inwardly from the blade towards the conical surface and outwardly through an axial face of the drum.

Abstract: A long-timber chipping machine has a timber feed channel for receiving longitudinally arranged timbers, advanced using a timber-advancing device to a vertically movable chipping device positioned at the downstream end of the feed channel. The chipping device has a rotatable cutter ring equipped with chipping cutters on its cylindrical inner wall, which defines a chipping chamber. The chamber is aligned with the downstream end of the feed channel. To improve the chipping, a curved timber-receiving plate projects into the chipping chamber from the downstream end of the feed channel, which also has a matching curved base. The curvature of the plate and the base match the curvature of upper cylindrical inner wall of the cutter ring so that the upper cylindrical inner wall can be lowered closely to the plate, leaving only a very small clearance and exposing all of the timbers to the chipping cutters.

Abstract: An improved knife clamping system for use in an apparatus for processing wood, such as a flaker, chipper or waferizer, that employs a rotary disc or ring, cutting knives, holding locations mounted on the disc or ring to receive the cutting knives, clamping members to engage and hold the cutting knives in position and fasteners to mount the clamping members to the holding locations. The improvement comprises providing a surface having an undulating profile to engage against the cutting knives. The undulating surface can be formed on the clamping member, at the holding location or at both locations. The surface is shaped to deform to engage the cutting knives with a uniform clamping load upon securing of the fasteners to a pre-selected torque. The foregoing arrangement requires fewer fasteners while still maintaining an adequate clamping force on the cutting knives. This makes parts less expensive and reduces the time to change the knives as there are fewer parts to loosen and tighten.

Abstract: The invention relates to a cutter block and a knife for chippers for removing particles of wood, which are used for producing particle board and the like. The knife is embodied as a disposable discontinuous or multiple edge knife or as a solid blade knife. The knife has retention and guiding recesses engaged form-fittingly by positioning pins of a support plate. Further, the knife is in compressive contact with a side wall face, trailing in the direction of rotation of the cutter block of the recess in the surface region of the block body.

Abstract: A cutting roll of the type with a cylindrical base member and at least one substantially axially-parallel blade attached thereto for separation of sugarcane, sweet sorghum, and the like. Grooves in the base have serrated walls engaging serrated sides of blade members, and wedging members secure the blades in proper radial adjustment in the grooves. A plurality of blade segments in each groove and a slight angling of the serrations allows blade rotation and provides a highly accurate and easily adjustable cutting roll.

Abstract: A drum chipper having a rotatable, power-driven drum supporting a knife. With rotation of the drum, a cutting edge in the knife is moved past a cutter bar. A knife mounting keyed to the knife is adjustably positioned along a path in the drum to position the knife. The knife is a double-edged knife, with one edge replacing the other with dulling of the latter edge.

Abstract: An infeed chute with a material and air deflector is provided for a shredding device such as a bark hog. The infeed chute is attached to the inlet of the cutting device and a material and air deflector is defined therein for preventing material from being ejected out of the infeed chute by the cutting blades without substantially obstructing material inflow. The material and air deflector is attached to the inside of the infeed chute and includes a flat plate upstream deflector surface and a curved downstream deflector surface. The deflector surfaces extend across the infeed chute to define a substantially tortuous path between the inlet and outlet of the infeed chute to prevent material ejected by the cutting device from leaving the inlet of the infeed chute or from obstructing infeed flow.

Abstract: Method and chipping device for cutting chips (10) from elongated pieces of wood (5) in a manner that the wood to be chipped is fed into a rotating cylinder (1) and chips are cut of the side of the piece of wood by ranges of blades formed by several blades (7) inside the cylinder surface. The wood to be chipped (5) is directed to the cylinder in a manner that the angle between the pieces of wood (5) and the ranges of blades is acute. Each piece of wood to be chipped is in contact with two or more blades (7) in different range of blades during the cutting.