Abstract: A multiple rotary knife for longitudinal splitting of webs, including a generally cylindrical annular body bearing a plurality of circumferential blades spaced apart, which are formed by continuous hard-metal rings mechanically fixed axially to the annular body.

Abstract: An electric saw device includes a first saw blade and a second saw blade. The first and the second saw blades are respectively driven by a small transmission shaft and a large transmission shaft to rotate in opposite directions. A round rib is disposed on an inner end surface of the first saw blade, and at least three recessed holes are arranged in a top end surface of the round rib at equal angle intervals. A steel ball is accommodated in each of the recessed holes, and protrudes out of the recessed hole. Protruding ends of the steel balls urge against an inner surface of the second saw blade, so as to limit a distance between the first saw blade and the second saw blade, and form a rolling friction when the first and the second saw blade rotate in the opposite directions.

Abstract: Assembly for perforating rod-shaped elements, particularly cigarettes, which comprises a driving shaft along which a number of rotary perforating cutters are arranged and the cutters are separated by distance rings, wherein each rotary cutter is positioned between two pushing elements and it protrudes from between those pushing elements.

Abstract: A cartridge is configured for slitting a mill roll in a slitting machine. The cartridge includes a first shaft mounted in bearings in a pair of endplates, with one end of the shaft having a driven yoke for rotation thereof. The first shaft includes a row of first circular blades spaced longitudinally by corresponding first spacers. A second shaft is pivotally mounted in the endplates, and is spaced parallel with the first shaft. A dovetail bar is fixedly joined to the second shaft parallel therewith. And, a row of blade holders are mounted along the dovetail bar, with each holder including a second circular blade aligned with a corresponding one of the first blades for cutting in shear a web unwound from the mill roll. The cartridge may be quickly replaced in the slitting machine for each production run thereof for alignment with cores on a corresponding arbor.

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: A cutting disc for separating containers (30) in a container-packaging-assembly (44) into defined container groups (31), the cutting disc (24) including two individual discs (22a, 22b). The individual discs (22a, 22b) each include at least one separator, and the rotational speeds of the individual discs (22a, 22b) are individually adjustable and preferably controllable separately of each other. Likewise, a cutting device (20) is disclosed that is employed within a packaging device (10) for containers (30). The described method makes it possible to separate an assembly (44) made from a continuous packaging (40) and a multitude of containers (30) connected with said packaging (40) into predefined container groups (31).

Abstract: A pair of saw blades includes a first blade, which is adapted to rotate in a first direction about an axis of rotation, and a second blade, which is adapted to rotate in a second direction opposite to said first direction about the same axis of rotation. Each blade has a blade body and cutting elements, which are provided along the periphery of the blade body and adapted to run close and in parallel to each other when the blades are rotating. A spacer, which extends into a space between the two blades, is attached to at least the blade body of one of the blades in order to support itself against and slide along a peripheral part of the other opposite blade.

Abstract: The invention concerns a pair of saw blades, including a first blade (1) and a second blade (2), which are arranged to rotate around the same rotational axis in opposite directions. Each of the blades (1, 2) has its own blade body (3, 4) and peripheral cutting elements (5, 6), wherein the blade body (3) of the first blade (1) has a front side, which is turned towards a back side of the blade body (4) of the second saw blade (2), and wherein the cutting elements (5, 6) form overhangs (9, 10) protruding from said front or back side.

Abstract: In one embodiment of the present invention, a hub device is disclosed for a pair of saw blades, which includes a first blade, which is arranged to rotate about a rotational axis in a first direction, and a second blade, which is arranged to rotate about the same rotational axis in a second direction opposite to said first direction. The hub device includes a first blade adapter, which has a support surface for the first saw blade, and a second blade adapter, which has a support surface for the second saw blade and a central fastener for a blade lock, which is arranged to secure both blades.

Abstract: An apparatus for positioning dicing saw blades at a fixed axial distance from one another independent of the thicknesses of the saw blades, where the saw blade thickness varies within a range. Flanges, spacers, and retention elements may be employed to achieve desired spacing of dicing saw blades in an assembly. At least one biasing element that is at least partially constrained about its outer radial periphery may be employed to achieve axial positional independence of each dicing saw blade with respect to other dicing saw blades of the assembly. Further, at least one retention feature may also be used to fix the position of the at least one biasing element in the assembly. Machining techniques may be used to form the components and features of the present invention.

Abstract: A shredder head adapted to shred data bearing documents and bottles.

Abstract: Disclosed is a diamond saw capable of reducing noise by installing a damper for absorbing vibration in a shank. The low noise diamond saw comprises: a shank formed of a circular metallic plate; and a diamond blade bonded to an outer circumferential surface of the shank, in which a damper is partially bonded to one or both of upper and lower surfaces of the shank by a spot welding.

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: A channel cutting tool may include an arbor that connects to a rotating spindle of a machining tool or a similar spinning part of a machining tool. Two slot cutting blades may be fixedly mounted to the arbor. An inner washer may be fixedly mounted on the arbor between the cutting blades and establish the blade spacing. An outer washer may be rotationally mounted to the inner washer with a smaller thickness to facilitate rotation relative to the two cutting blades. The arbor rotates about a longitudinal rotation axis, which also may be the rotation axis for the cutting blades, the inner washer, and the outer washer. The outer washer functions as a depth-limiting safeguard for the channel cutting tool.

Abstract: A light-weight mechanical spacer is provided and includes first and second housing plates and a plurality of shafts or posts. The housing plates include a generally circular shape and include a coaxial bore formed therethrough for receiving an arbor. The first and second housing plates are connected by a plurality of shafts to both define the overall width of the spacer as well as to provide increased strength. The shafts enable the light-weight design as they effectively replace the solid mass of steel commonly found in conventional spacers.

Abstract: A method and device for diverting signatures is disclosed. A first cutting device partially cuts a web, while a second cutting device downstream of the first cutting device fully cuts the web so as to form a plurality of signatures. At least one first belt and at least one second belt hold the plurality of signatures, with the first belt having at least one first raised outer section and passing through at least part of the second cutting device, and with the second belt having at least one second raised outer section. The first and second raised outer sections interact to offset the plurality of signatures so as to define an alternating first stream and second stream of the plurality of signatures.

Abstract: In a sawing tool for a hand circular power saw with two coaxial saw blades (11, 12), which can be driven to counter-rotate in relation to each other, which each have an outer set of teeth (13, 14) that represents a main cutter, in order to improve the cutting result even with continuing wear on the cutting edge and in order to reduce damage to the teeth (13, 14) when the saw blades (11, 12) are imperfectly balanced, a trimmer (10) is disposed between the two saw blades (11, 12), which serves to cut away a piece of material possibly remaining in the kerf between the saw blades (11, 12) and which is non-rotatably attached to one of the saw blades (11, 12) and shares an axial overlap with the main cutters (FIG. 3).

Abstract: A ventilated air cooled cutting system for a circular saw that produces a thinner kerf than previously achievable. The air cooled cutting system is comprised of a saw blade having a thin blade cutting portion and a thick hub portion. The blade cutting preferably is ground from a plate, while the hub portion remains substantially the thickness of the starting plate material. The thicker hub portion serves as a heat sink to conduct heat away from the thinner blade cutting portion. Cooling holes are provided in the hub portion to provide convection cooling of the hub portion. The thicker hub portion also provides rigidity or stiffness to the blade so that it is better able to withstand torsional forces experienced during the cutting operation. If additional cooling is required, a spacer collar having a series of axial and radial apertures can be fitted to the hub portion to force cooling air through the hub portion in order to enhance cooling.

Abstract: The invention falls within the field of labeling machine with the continuous introduction of a reeled label film. In particular, it relates to the cutting roller of the label film and it comprises a cooling line for the two support systems of the shaft of the cutting roller. The cooling line is preferably independent for each of the two systems and it comprises a probe for measuring the temperature of the related support which sends its measured value to a block for its comparison with a pre-set preferential temperature value. The block, according to the compared value, activates a solenoid valve inserted on the compressed air supply circuit.

Abstract: A spacer element having a first material and at least one second material. The at least one second material has a specific gravity less than that of the first material, and the first material is integrated with the at least one second material. Also contemplated is a rotary knife arrangement having such a spacer element.

Abstract: A slitting assembly (10) is disclosed in the preferred form of a rotary cutter including a shaft (50) upon which relatively thin, large diameter annular blades (56) are slid. Relatively large diameter hubs (60) are provided having inner surfaces for receipt on the shaft (50) and having axial ends which flushly abut with the axial faces of the blades (56) for holding the blades (56) in axially spaced relations on the shaft (50). An axial bore (54) is provided through the shaft (50) for circulating a coolant in fluid communication therewith by rotary unions (74, 78). Thus, the blades (56) are cooled below ambient temperature by conduction through hubs (60) and shaft (50) for imparting continuous longitudinal cuts in a band (12) of fat-free brownie products having an internal temperature higher than ambient. The outer periphery of the blades (56) rotate against a back-up roll (22) rotatable about a parallel axis below the band (12).

Abstract: A method of dividing deep-frozen food blocks comprising forming a succession of spaced parallel blade rows each row having a plurality of spaced parallel coaxial freely rotatable discoid blades and advancing successive food blocks past the successive blade rows so that the blades in the successive blade rows rotate with a peripheral speed which more or less matches the speed of the block advance so that there is minimal relative linear motion of the blade edges and the blocks whereby the blades groove the blocks by displacing block material to the sides of the grooves and selecting a number of blade rows such that while the grooves made by any blade row are quite shallow, the grooves made by all of the blade rows divide each of the blocks into a plurality of parts. Apparatus for practicing the method is also disclosed.

Abstract: A knife assembly for a veneer cutting apparatus, which includes at least two cutting blades mounted on a shaft. The cutting blades are independently rotatable to permit cutting of the veneer across its entire length or across a portion thereof.

Abstract: A duct insulation board grooving apparatus cuts a plurality of parallel grooves into duct boards with a plurality of rotary saw blades which are spaced on 1.57 inch or 3.14 inch centers. The saw blades have peripheral teeth which project outwardly on both sides of the saw blades to form grooves in a first major surface of a duct board which are wider than the saw blades. The grooves have sidewalls which extend perpendicular to the first major surface of the duct board and have a depth from 70% to 90% of the thickness of the duct board. The first major surface is typically coated and a second major surface of the duct board normally has a facing adhered thereto. After the duct board is grooved, the duct board can be curved to conform to the curvature of a tubular metal shell, with the parallel grooves of the duct board extending parallel to the axis of curvature, and placed in the tubular metal shell as a liner to form an insulated air duct.

Abstract: A shredder comprising a frame, at least two rotatable shafts supported in parallel by the frame, a plurality of cutting blades, each of the blades including a mount which is fixed to one of the shafts and has an outer peripheral side, and a number of tip pieces, each tip piece being fixed to the peripheral side of the mount, and a plurality of spacers mounted on each of the shafts alternately with the blades such that the spacers on each of the shafts are radially aligned with the blades on the other shaft.

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: A device is disclosed for limiting the movements of a shaft in response to the changes in tension in a sheet passing in contact with the shaft, and a cutting machine using such a device. The device comprises at least one cylindrically shaped member (10, 11) designed to be placed in contact with the said shaft (16) so as to limit the movements, each of the cylindrical members (10, 11) allowing two levels of contact with the shaft, a first variable level on a non-metallic surface of the member for normal tension conditions in the sheet (17) and a second, substantially fixed level for abnormally high conditions of tension in the sheet.

Abstract: The invention relates to a bracing device (4) for the blades of a saw mill (0) having at least two saws solid with a drive shaft (22), said device being characterized in that it comprises a ring (38) from the periphery of which a plurality of tongues (40) extend having an inherent transverse resilience, said ring (38) being adapted to be disposed between said saw blades.

Abstract: Dado shims that are disks of substantially incompressible, flexible, color coded plastic sheet material of uniform predetermined thicknesses having a central arbor hole and a radial slot narrower in width than the arbor hole diameter so that each shim is shaped like the letter "C" and can be distorted slightly during positioning on a saw arbor between dado set blades without removing any of the blades, by slipping the shim over the arbor through the slot until the shim seats on the arbor within the shim arbor hole.

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: An apparatus for slitting sheet material to a desired width includes laterally spaced circular slitter knives each fixed to a hub mounted on a rotatable shaft, each said hub being an hydraulic hub adapted to be expanded to permit axial movement on the shaft by injecting hydraulic fluid into an annular groove in the inside diameter of the hub. The novel feature comprises spacer rollers between the slitter knives to support the sheet material, these spacer rollers being arranged in cooperating pairs with each spacer roller comprising an annular hub portion with a plurality of equally spaced projections extending in an axial direction from at least one annular face of said hub. The projections are adapted to slidably mate with like projections of a cooperating spacer roller and each spacer roller hub is adapted to be expanded to permit axial movement thereof on the shaft by injecting hydraulic fluid into an annular groove in the inside diameter of the spacer roller knife hub.

Abstract: A spacer is provided for an essentially cylindrical tool on whose circumference arc-shaped blades are mounted with spacers between them by means of bolts extending in the axial direction through the spacers. The spacer is made of steel sheet and has tangs bent out of the plane of the sheet. The tangs determine the distance between neighboring blades and are disposed on the inside edge and outside edge of the spacer oriented in the circumferential direction of the tool and the spacer. The tangs situated side by side in the circumferential direction have spaces between them in order to make a simple adaption to different distances between neighboring blades possible while simultaneously improving the removal of heat.

Abstract: A document shredder comprises a pair of cutter assemblies, each having a shaft on which there are cutter disks with interspersed spacers. The disks overlap to form a nip. On the one shaft, additionally, there are rings mounted in the spacers, and that permits the shaft to be axially compressed tighter than the shaft without rings. This provides for relative flexibility and axial movement between the shafts such that foreign objects can more easily be removed. A 20 inch cutter assembly driven by a single phase motor through a planetary gear system is provided.

Abstract: In order to be able to position the cutter blades (A, B, C) of a cutter head so that they are radially adjustable in a simple manner in the smallest possible axial space, toothing, (10) is formed in an elongated hole (7) in the area of the blade root (6) at its parallel opposite internal longitudinal edges, whereby toothing (11) at parallel opposite external longitudinal edges of a shaft mounting plate (8) engages with this toothing (10), the shaft mounting plate having a central opening (9), the shape of which corresponds to the cross section of a driven shaft (9'). In this arrangement the thickness of the shaft mounting plate (8) is not greater than the depth of the elongated hole (7), although the length of the shaft mounting plate (8) is smaller than the longitudinal extension of the elongated hole (7).

Abstract: Slitting shears for sheets and strips of metal. The shears include knife rollers which support circular knives and are adjustable for adjusting the overlap of the knives. The gaps between the knives are adjustable by means of spacer sleeves arranged on the rolls between the circular knives. The slitting shears further include a bending control unit for the knife rollers for keeping constant the adjusted knife overlap and knife gaps. The bending control unit makes it possible to prevent positional changes of the cutting edges of the circular knives under load, so that cut edges without burrs can always be produced independently of the cutting forces. Bending of the knife rollers can be compensated in a controlled manner by sensing the bending of a knife roller.

Abstract: Parallel spaced rotary arbors support a plurality of axially spaced circular slitter knives, and a series of spacer rings precisely locate the slitter knives on each arbor. Each spacer ring includes a rigid carrier ring having three circumferentially spaced undercut cavities which confine corresponding floating gage blocks each having a precision axial width slightly greater than the axial width of the carrier ring. The carrier rings on each arbor are rotatably aligned by a keyway and include a pair of flat ring sections each having circumferentially spaced tapered holes which mate with corresponding chamfered surfaces on the gage blocks. The ring sections are secured together by screws or spot welds, and the wider spacer rings have corresponding core rings confined between the ring sections.

Abstract: A pusher comprises a body with a plurality of piston holes provided on a front surface thereof, pistons slidably fitted to the piston holes and each having a front end extending in front of the body, an oil passage provided in the body and communicated with a bottom portion of each piston hole, a pressure chamber provided in the body and communicated with the oil passage, a threaded shaft threadably fitted to a threaded hole which is provided in the body and communicated with the pressure chamber, and oil filled in the bottom portion of each piston hole, the oil passage and the pressure chamber, where the piston is adapted to be pushed in front of the body by the threadable advancing of the threaded shaft at force larger than the advancing force of the threaded shaft.

Abstract: A manually actuatable produce cutter is provided including a horizontal produce receiving trough and a disc cutter assembly journalled for rotation about a horizontal axis paralleling the trough and with one sector area of the disc cutter registered with and extending across one end of the trough. The trough includes a follower plate guidingly supported therefrom for movement longitudinally of the trough toward and away from the disc cutter and the latter includes a central support shaft extending outwardly therefrom journalled from the trough and projecting toward the second end thereof. The disc cutter and shaft are axially disengageable from the trough in a direction extending outward of the first end thereof and the latch structure is provided for latching the disc cutter and shaft against axial disengagement from the trough, the latch structure, when in the release position, including portions thereof preventing movement of the following plate beyond a predetermined position toward the disc cutter.

Abstract: A blade assembly for a meat cutter, which assembly includes a drive shaft having an axis, a plurality of driving discs made of light metal mounted on the drive shaft, a plurality of cutting blades alternating with the driving discs along the shaft to form a stack with the driving discs, two end pieces mounted on the shaft and each disposed at a respective end of the stack, the driving discs being connected in a form locking manner with the shaft and the blades being axially clamped between the driving discs in a force transmitting manner, a plurality of outer rings of chemically resistant plastic material each disposed around a respective one of the driving discs and end pieces, and being substantially coextensive, parallel to the shaft axis, with the associated driving disc or end piece, and each ring having a radial dimension substantially equal to the axial dimension of each driving disc, and a plurality of sealing rings of a chemically resistant plastic elastomeric material each pressed into a respective

Abstract: A method of setting up tooling on parallel rotary arbors for cutting plural parallel longitudinal slits in a web of sheet material advancing between the arbors, using a set of tooling comprising multiple circular cutter elements and multiple circular spacer elements, the elements having various nominal axial lengths with a common axial length tolerance of .+-.t. Each element, measured to determine the deviation between its actual and nominal axial length, is detectably identified (e.g. by color coding) with one of plural discrete successive subranges of the overall tolerance range .+-.t, viz., with that subrange in which its measured axial length deviation lines.

Abstract: Labor and material costs for the maintenance and replacement of rotary slitting and slotting knives used in the conversion of corrugated paperboard are reduced by utilizing air channels behind shear knives of thin steel stampings for convective removal of heat from knife bodies.

Abstract: The present invention relates to a circular saw blade comprising a first annular saw blade having a plurality of teeth projecting radially from the periphery thereof and a second circular saw blade having a plurality of teeth projecting radially from the periphery thereof. The first blade has a greater diameter and a smaller thickness than the second blade and the teeth on the first blade are angularly set so as to partially extend into the cutting plane of the second blade. The blades are mounted coaxially adjacent to one another such that when used to cut through a workpiece, the first blade makes a fast rough cut and the second blade follows partially within the path of the first blade and provides a smooth, finished cut.

Abstract: A machine for cutting slabs of frozen meat into cubes comprises a rotating cutting drum having alternatingly disposed slitting discs and knife discs. The slitting discs have a contour to minimize the risk of fracturing upon penetration into the meat in that the slicing edge thereof extends over a substantial portion of their circumference and slices the slab into a plurality of strips which are cut into cubes by the knife discs.

Abstract: An improvement in a method for simultaneously slicing one or a multiplicity of boules of silicon into silicon wafers, the improvement of which comprises forming a plurality of vertical stacks of horizontal saw blades of circular configuration arranged in juxtaposed coaxial alignment, each blade being characterized by having a cutting diameter slightly greater than the cutting diameter of the blade arranged immediately thereabove; imparting simultaneous rotation to the blades, supporting in depending relation a plurality of enlongated boules of silicon, simultaneously translating the boules through the blades, and simultaneously imparting rotation to the boules as the boules are passed through said blades for slicing wafers therefrom; and an improved apparatus for performing said method.

Abstract: A blade assembly has a support shaft extending along an axis and having an end member and a polygonal-section portion extending axially from the end member. A plurality of like metallic support disks are supported on this shaft and have central holes traversed by and complementary to the polygonal-section portion and outer peripheries. Respective metallic blades lie flatly axially on the support disks and each have a radially outwardly projecting cutting portion extending radially outwardly past the outer periphery of the respective support disk. The blades with the respective support disks are axially spaced along the polygonal-section portion. Respective fasteners engaged axially through the support disks and the respective blades secure each blade to the respective support disk for joint rotation therewith.

Abstract: Apparatus for slitting sheet material includes a pair of rotatable shafts having cooperating cutting knife assemblies thereon. The knives on one shaft are in the form of axially-spaced knife rings receivable between knife members on the other shaft. The knife rings are elastically deformable axially of the shafts and are spaced-apart a distance slightly greater than the spacing between the knife members to insure the absence of any gaps between the cooperating cutting knives. The knife members are releasably clamped axially on their shaft and are biased apart upon release of the axial clamping force in order to allow positioning of the knife rings between the knife members. Central mounting holes in the knife members increase in size from the axial center thereof toward the opposite ends thereof for allowing limited tilting movement of the knife members relative to the shaft on which they are mounted.

Abstract: An apparatus for separating conductors of a ribbon cable comprising a pair of fixed rollers having a plurality of radial intermeshing teeth spaced to engage the conductors.

Abstract: A document shredder having first and second rotary cutting disks alternatively arranged and held in shredding engagement with one another to shred waste material into strips, first spacer members disposed in first gaps formed between the first rotary cutting disks, and second spacer members disposed in second gaps formed between the second rotary cutting disks. The first stationary cutting members have cutting edges held in shredding engagement with outer peripheries of the second rotary cutting disks in the first gaps to cut the strips into chip fragments in the first gaps. The second spacer members have cutting edges held in shredding engagement with outer peripheries of the first rotary cutting disks in the second gaps to cut the strips into chip fragments in the second gaps.

Abstract: Assembly for perforating rod-shaped elements, particularly cigarettes, which comprises a driving shaft along which a number of rotary perforating cutters are arranged and the cutters are separated by distance rings, wherein each rotary cutter is positioned between two pushing elements and it protrudes from between those pushing elements.