Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
  • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
  • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
  • B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
  • B26D1/40—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a rotary member
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/01—Means for holding or positioning work
  • B26D7/018—Holding the work by suction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/18—Means for removing cut-out material or waste
  • B26D7/1845—Means for removing cut-out material or waste by non mechanical means
  • B26D7/1854—Means for removing cut-out material or waste by non mechanical means by air under pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/384—Cutting-out; Stamping-out using rotating drums
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/44—Cutters therefor; Dies therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/44—Cutters therefor; Dies therefor
  • B26F2001/4436—Materials or surface treatments therefore
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
  • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
  • B26F1/38—Cutting-out; Stamping-out
  • B26F1/44—Cutters therefor; Dies therefor
  • B26F2001/4472—Cutting edge section features

Definitions

• the present invention relates to a rotary cutting device for a rotary cutting apparatus, comprising at least one part made of a multiphase material, including at least one cutter portion having a first and a second substantially circular cylindrical outer surface, said cutter portion comprising at least one knife member protruding from and separating said first and second surfaces from each other, said first and second surfaces and said knife member being integral parts of said cutter portion.
• the invention also relates to a rotary cutting apparatus comprising an anvil roll and such a rotary cutter.
• Such a rotary cutter and such a rotary cutting unit marketed by Sandvik AB under the trade name "Sandvik CRC" are illustrated in Figs. 5 and 6.
• the known rotary cutter however suffers from the drawback that steel inserts must be taken away from the drum when re- sharpening a dull cutter. Furthermore, the inserts are screwed onto the drum, causing cumbersome screwing and unscrewing of the inserts before re- sharpening.
• the rotary cutter unit A comprises a rotary cutter drum B made a multiphase material, such as a carbide, ceramics or metallic powder, in working relationship with a rotary anvil drum C.
• the rotary cutter drum B is provided with a cutter portion D having surfaces Ea, Eb on either side of at least one knife member F protruding integrally from said surfaces Ea, Eb, the radially outer peripheral part of said knife member F having a diameter larger than that of said surfaces Ea, Eb, respectively.
• the knife member F extends 6-14 mm from the surface Ea and forms a cutting edge structure at said peripheral part.
• the rotary cutter drum B is provided with an arbour G adapted to be connected to a driving unit, such as an electric motor (not shown).
• a pair of annular abutment members Ha, Hb having a diameter larger than that of the surfaces Ea 1 Eb of said cutter portion D. Furthermore, the abutment members Ha, Hb have a diameter which is substantially the same as the radially peripheral part of said knife member F.
• the annular abutment members Ha, Hb are adapted to lie against and to transmit the rotation of the rotary cutter drum B to said anvil C, such that it turns in a direction opposite to that of said rotary cutter drum B.
• the cutting member 10 comprises respective sides that extend divergingly from an outermost portion of the knife member. One of those sides extends toward the exposed outer surface of the insert Ja, and the other side extends toward the exposed outer surface of the insert Jb.
• Both of the sides extend radially inwardly past the insert's outer surfaces since the cutting member is integral with (of one piece with) the surfaces Ea and Eb that underlie the inserts.
• the radial extension of the knife radially outwardly past the outer surfaces of the inserts is chosen depending on the material to be cut, but lies within the range of 0.5 mm to 5 mm.
• Radially directed holes La are formed in the body inside the knife member.
• Corresponding aligning holes Lb are made in the inserts Ja.
• Holes Lc are also formed in the cutter portion D axially outside the knife member F; aligning holes Ld are formed also at corresponding positions of said inserts Jb.
• the holes La, Lb and Lc, Ld communicate with axially extending channels M in said body, said holes La, Lb and Lc, Ld being selectively connected to a source of vacuum and/or to over pressure (alternatively atmospheric pressure) by means of a not shown control unit with suitable valves.
• the holes La and Lc are provided with not shown sealings, such as 0- rings or any kind of suitable gasket to seal against the inserts Ja, Jb, such that leakage between the insert and the surfaces Ea and Eb, respectively, is prevented.
• sealings such as 0- rings or any kind of suitable gasket to seal against the inserts Ja, Jb, such that leakage between the insert and the surfaces Ea and Eb, respectively, is prevented.
• the drums B, C rotate in the direction as indicated by arrows in Fig. 5.
• a web N is introduced into the rotary cutter unit A between the drums B and C.
• the holes La, Lb and Lc, Ld are controlled to be connected to the vacuum source, such that the web sticks to the insert Ja covering the surface Ea.
• the knife cuts the web to the shape of the knife member.
• the holes La, Lb are controlled to be connected to over-pressure or atmospheric pressure, such that the cut product is released from the insert Ja and is allowed to be transported by, e.g., a not shown conveyor belt.
• the holes Lc, Ld are still subjected to vacuum such that the trim P, i.e., residue of the web, is allowed to stick to the insert Jb covering the surface Eb such that the trim is allowed to continue rotation together with the drum B.
• the holes Lc, Ld are connected to over- pressure or atmospheric pressure, such that the trim P can be released and collected.
• U.S. Patent No. 5,967,009 discloses a rotary cutter having a drum made of steel provided with a plurality of knives formed in one piece with the drum. This kind of drum is disadvantageous, since the knife has limitations with respect to its size, since a knife of that kind protruding radially more than 1/4 inch (6.25 mm) would produce excessive momentum on the knife, in turn generating cracks in the steel, whereas a knife protruding less than 0.1 inch (2.5 mm) is not capable of being machined.
• the object of the invention is to achieve a less complex rotary cutting device.
• the object is solved by the rotary cutter as initially defined wherein the knife member extends in the range of 1 to 5 mm radially outwardly of the one of said first and second surfaces having the smallest diameter.
• the outer periphery of the knife member comprises a pair of cutting edges and a slanting portion extending from each edge towards said surfaces, respectively, said slanting portion extending to at least 50% of the radial extension of said knife member.
• the slanting portion extends substantially the whole radial extension of said knife member.
• a land surface disposed between the cutting edges may not be visible to the naked eye, since it may have an axial extension of only fractions of a millimeter.
• a plurality of openings are formed in the cutter portion adapted to be associated with a source of gas having a controllable pressure, at least one opening being arranged substantially at said knife member.
• a source of gas having a controllable pressure at least one opening being arranged substantially at said knife member.
• at least one annular member is adapted to abut a rotatable anvil drum, said annular member having a diameter extending substantially to the same extent above the surface as said knife member.
• At least one cutter portion and said at least one annular member are integral parts of a solid arbour.
• said at least one cutter portion and said at least one annular portion are integral parts of a single sleeve having an inner surface defining an inner diameter, said sleeve being adapted to be arranged on an arbour.
• said at least one cutter portion and one of said annular portions constitute an integrated part
• the other annular member constitutes a separate part of a sleeve having an inner surface defining an inner diameter, said separate parts being adapted to be arranged on an arbour to form said sleeve.
• said at least one cutter portion and said at least one annular member are separate parts of a sleeve having an inner surface defining an inner diameter, said separate parts being adapted to be arranged on an arbour to form said sleeve.
• a wall thickness of said sleeve is defined by the difference between the diameter of said inner surface and the one of the first or second outer surface having the smallest diameter, said wall thickness is suitably in the range of 1 cm - 10 cm.
• Fig. 1A is a perspective view of a rotary cutter unit comprised of a first embodiment of a cutter drum in engagement with an anvil drum.
• Fig. 1 B is an exploded perspective view of a second embodiment of a cutter drum according to the invention.
• Fig. 1 C is a further exploded view of Fig. 1 B.
• Fig. 1D is a view similar to Fig. 1C of a third embodiment of a cutter drum according to the invention.
• Fig. 2 is an enlarged fragmentary view of any of the drum embodiments of Figs. 1 A-1 D.
• Fig. 3 is an enlarged fragmentary view of Fig. 2 of a first spatial relationship between a knife member and an abutment member according to the invention.
• Fig. 4 is a view similar to Fig. 3 showing a second alternative spatial relationship between the knife member and the abutment member.
• Fig. 5 is a perspective view of a prior art rotary cutter unit as it cuts a web.
• Fig. 6 is an exploded perspective view of the prior art cutting drum used in Fig. 5.
• Fig. 1A shows a rotary cutter unit 2 comprising a rotary cutter drum 4 made of a multiphase material, such as a carbide, ceramics or metallic powder, arranged in working relationship with a rotary anvil drum 6.
• a rotary cutter unit 2 comprising a rotary cutter drum 4 made of a multiphase material, such as a carbide, ceramics or metallic powder, arranged in working relationship with a rotary anvil drum 6.
• the drum 4 is generally solid and has a pair of annular abutment members 12a, 12b, produced in one piece of a multiphase material, such as a carbide or ceramics.
• the rotary cutter drum 4 is provided with a cutter portion 8 situated axially between the abutment members 12a, 12b.
• the cutter portion has outwardly exposed surfaces 9a, 9b on either side of at least one endless knife member 10 of the cutter portion, which knife member protrudes radially outwardly beyond said surfaces 9a, 9b.
• the radially outer periphery of the knife member 10 has a diameter larger than that of each of said surfaces 9a, 9b.
• the knife member 10 extends 1-5 mm from the surface 9a and forms a cutting edge structure at its radially outer periphery.
• an arbour 11 adapted to be connected to a driving unit, such as an electric motor (not shown).
• abutment members 12a, 12b have a diameter which is substantially the same as the radially peripheral part of said knife member
• the annular abutment members 12a, 12b are adapted to lie against, and transmit the rotation of the rotary cutter drum 4 to said anvil 6, such that the anvil turns in a direction opposite to that of said rotary cutter drum 4.
• Fig. 1 B shows a rotary cutter drum 4A according to a second embodiment of the invention adapted to be arranged in working relationship with a rotary anvil drum 6 to form a rotary cutting unit.
• the drum 4 is constituted by an arbour part 17a and a sleeve part 17b, the sleeve part having a cutter portion 8 with at least one knife member 10 and an annular abutment member 12a, 12b on each side of said cutter portion 8.
• the arbour part 11 is preferably made of steel, whereas the sleeve part is preferably made of a multiphase material.
• the sleeve part 17b has an inner surface 17c, the diameter of which is slightly smaller that that of the outer surface 17d of the arbour part 17a.
• the sleeve part 17b is mounted on the arbour part 17a by press fit.
• the sleeve part 17b needs to be serviced, e.g., due to a dull knife member 10, the sleeve part 17b is slid off the arbour part 17a after performing a cold treatment on the arbour part.
• the sleeve part 17b may be divided into three pieces, i.e., a knife part 17e comprising the cutter portion 8 and two separate parts 17f, 17g, comprising said abutment members 12a, 12b.
• the sleeve portion 17b of a drum 4B may instead be divided into two pieces, wherein the cutter portion 8 and one of the abutment members 12a constitute one part 17h, and the other of said abutment members 12b constitutes a second part 17i.
• Figs. 2-4 show the knife member 10, the surfaces 9a, 9b and one of the annular abutment members 12a of any of the embodiments shown in Figs. 1A-1 D.
• the knife member 10 extends by a radial distance d in the range of 1 mm to 5 mm radially outwardly beyond the surfaces 9a and 9b, assuming that the surfaces 9a and 9b have equal diameters.
• the knife member 10 extends by a distance d in the range of 1 mm to 5 mm radially outwardly beyond the surface 9a or 9b having the smaller diameter. Stated differently, the knife member extends by a distance d in the range of 1 mm to 5 mm radially outwardly beyond a smallest diameter portion of the first and second exposed surfaces 9a, 9b.
• the annular abutment member 12a extends substantially to the same elevation, i.e., to substantially the same location radially outwardly of the surface 9a as the knife member 10. However, there may be a slight difference 19 (Fig.
• radial extension between members 12a and 10 may, e.g., in the range of -0.5 mm to +0.5 mm, depending on the material of the web to be cut.
• This difference 19 is shown as a positive value in Figs. 3 and 4.
• the radially outer cutting edge structure of the knife member 10 comprises a pair of cutting edges 20a, 20b separated axially by a land area 20c.
• a side portion 21 terminates radially inwardly at the exposed surfaces 9a, 9b, respectively.
• the side portion 21 comprises a slanting portion 22 and a concavely curved portion 24 for facilitating manufacture of the edge, such that the strength thereof becomes optimal.
• the slanting portions diverge toward the surfaces 9a, 9b.
• the land area 20c might not be visible to the naked eye, i.e., it can be in the range of 1 asm and 0.5 mm.
• a modified knife member 10A comprises a slanting portion 22 and a substantially radially extending portion 26.
• the radially extending portion constitutes less than half the height of the knife member 10

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• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
• Nonmetal Cutting Devices (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
• Crushing And Pulverization Processes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=32733760

Family Applications (1)

Country Status (6)

Cited By (4)

Families Citing this family (14)

Citations (7)

Family Cites Families (9)

• 2004
  • 2004-07-02 SE SE0401736A patent/SE528041C2/sv not_active IP Right Cessation
• 2005
  • 2005-06-20 KR KR1020067025261A patent/KR20070020264A/ko not_active Application Discontinuation
  • 2005-06-20 CN CNA2005800203151A patent/CN1968795A/zh active Pending
  • 2005-06-20 WO PCT/SE2005/000947 patent/WO2006004492A1/en active Application Filing
  • 2005-06-22 EP EP05445049A patent/EP1612014A1/en not_active Withdrawn
  • 2005-07-04 JP JP2005195165A patent/JP2006015485A/ja active Pending

Patent Citations (7)

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