US3374699A - Sharpening arrangements - Google Patents

Sharpening arrangements Download PDF

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Publication number
US3374699A
US3374699A US475539A US47553965A US3374699A US 3374699 A US3374699 A US 3374699A US 475539 A US475539 A US 475539A US 47553965 A US47553965 A US 47553965A US 3374699 A US3374699 A US 3374699A
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United States
Prior art keywords
sharpening
disc
cutting edge
shaft
arrangement
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US475539A
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English (en)
Inventor
Schmermund Alfred
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Individual
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Individual
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Publication date
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Publication of US3374699A publication Critical patent/US3374699A/en
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Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B7/00—Cutting tobacco
    • A24B7/04—Cutting tobacco by machines with revolving knives
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/14—Machines of the continuous-rod type
    • A24C5/28—Cutting-off the tobacco rod
    • A24C5/30—Machines combined with devices for grinding the knives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/363—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of blades mounted on a turning drum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/38—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades for planing wood, e.g. cutter blades
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/303—With tool sharpener or smoother
    • Y10T83/313—Spatially fixed tool

Definitions

  • a rotary cutting device is described to cut, for example, tobacco, in which straight rotating cutting edges are inclined relative to the axis of rotation so that each cutting edge engages the tobacco progressively to obtain a slicing action rather than a chopping action.
  • the invention provides a rotatable disc for sharpening the cutting edges while they are rotating.
  • the sharpening disc is mounted in a lever arrangement operable by cams which are rotatable synchronously with the cutting edges so that the disc is reciprocated in the direction of the cutting edge which is being sharpened and is oscillated in a curved path transversely to the axis of rotation of the rotatable sharpening disc; means may be provided for feeding the sharpening disc towards the cutting edges.
  • Descriplion of invention The invention relates to arrangements for sharpening rotating cutting edges.
  • each cutting edge progressively engages the tobacco to be cut in order to obtain a slicing action rather than a chopping action. It is further desirable to employ cutters having straight cutting edges, since such cutters are less expensive to manufacture than cutters having curved cutting edges.
  • each straight cutting edge relatively to the axis of rotation so that the cutting edge when rotating describes a hyperboloid of revolution.
  • An arrangement has further been proposed for sharpening such an inclined straight cutting edge while rotating, the arrangement comprising a sharpening device movable rectilinearly at an inclination to the axis of rotation of the cutting edge, said inclination corresponding to the inclination of the cutting edge relatively to its axis of rotation.
  • FIG. 1 is a perspective view, partly broken away, of a specific arrangement of the invention
  • FIG. 2 is an elevational view of a part of the arrangement of FIG. 1;
  • FIG. 3 is a plan view seen from above of the part illustrated in FIG. 2, FIGS. 2 and 3 being on a larger scale than FIG. 1.
  • the arrangement illustrated comprises a base 30 provided with opposite side walls 20 having extensions 23in which a shaft 22 is rotatably mounted.
  • a carrier 24 is fixed to the shaft 22 and carries four cutters 25 each having a rectilinear cutting edge 251.
  • the cutting edges are inclined relative to the axis of rotation of the shaft 22, so that each cutting edge on rotation describes a hyperboloid of revolution.
  • One end of each cutting edge 251 is rotatable along a circle of radius R, the opposite end of each cutting edge being rotatable along a circle of radius 1'.
  • Means for displacing a disc 33 for sharpening the cutting edges 251 in a direction parallel thereto comprise two rods 1 which are arranged parallel to each cutting edge 251 when in position for sharpening and which thus are inclined to the shaft 22, the inclination corresponding to the difference between the radii R and r.
  • the rods 1 are mounted at one end in a holder 7 and at the other end in a holder 8.
  • the holder 7 is rotatable about a stud 5 held by a screw 12 in a guide member 4.
  • the holder 8 is mounted on a bracket 9 fixed to a guide member 4A and is provided with a groove 5C.
  • a stud 5A is provided which carries a roller 5B engaging the groove 5C.
  • the guide rods 1 together with the holders 7 and 8 are mounted on the guide members 4 and 4A.
  • the guide members 4 and 4A are displace-ably mounted on parallel guide rods 3 extending in transverse direction to the rods 1, the guide rods 3 being fixed on arms 2 which by means of bushings 21 are rotatable about the shaft 22, and thus the guide members 4 and 4A together with the holders 7 and 8 are rotatable about the shaft 22.
  • the arms 2 are of equal length, and are connected to operating rods 31, 32 which are linked to arms 62 mounted on a shaft 27 by means of hubs 66.
  • One of the arms 62 is provided with a roller arm 63 carrying a roller 64 which co-operates with ,a cam mounted on a control shaft 28.
  • a roller arm 63 carrying a roller 64 which co-operates with ,a cam mounted on a control shaft 28.
  • the cam 65 By means of the cam 65 the arms 2 and thereby the rods 1 with the sharpening disc 33 are rotatable about the shaft 22.
  • the guide member 4 carries a guide link 11, and the guide member 4A carries a similar guide link 10.
  • the guide links 10 and 11 are'each provided with a roller 13 rectilinearly movable in a stationary slot 14 provided in a bracket 15, each bracket 15 being fixed at its lower end 16 to a traverse 17 by means of angular pieces 18 and 19, the traverse 17 being mounted on the sidewalls 20.
  • the other end of each bracket 15 is fixed on a stationary part (not shown) of the machine.
  • the holder 8 has an extension 8A which carries a toothed wheel 42.
  • holding arms 51A and 51B are provided which comprise bearings 51, 51C, 48 and 49 in which shafts 50 and 47 are mounted which are angularly inclined to each other.
  • a toothed wheel 44 and a bevel gear wheel 45 are mounted on the shaft 47 .
  • a toothed driving belt 43' is trained around the toothed wheels 42 and 44.
  • a pinion 53 and a further bevel gear wheel 46 are mounted, the further bevel gear wheel 46 meshing with the bevel gear wheel 45.
  • the bearing 51C has a cylindrical extension on which guides 55 and a holder 52 for the guides 55 are rotatably provided.
  • a rack 54 is mounted in the guides 55 and meshes with the pinion 53. At one end, the rack 54 carries a clamp 56, a projection 58 of which is pivoted to an arm 57 which has a hub 67 rotatably mounted on the shaft 27 and secured against axial displacement by retaining rings 68.
  • the arm 57 has a roller arm 59 carrying a roller 60 co-operating with a cam 61 rotatable by the control shaft 28.
  • the control shaft 28 and the shaft 27 are mounted in portions 69 of the side walls 20 and are additionally supported by a support wall 29.
  • a guide member 37 for the sharpening disc 33 is slidably mounted on the rods 1 and carries an angular member 40 to which the driving belt 43 for displacing the guide member 37 is fixed by means of a clamp 41.
  • the guide member 37 is also provided with a transverse guide 38 on which a feed slide 39 is displaceable.
  • a motor 34 is mounted for rotating the sharpening disc 33 fixed thereto by means of a nut 35.
  • a tobacco rod to be cut is indicated by reference numeral 26.
  • the width of the carrier 24 for the cutters 25 equals approximately the length L of the cutters 25 which in turn approximately equals the width of the tobacco rod 26.
  • AA indicates a line passing through the centre of pivots connecting the operating rods 31, 32 to the arms 2. The distance s is indicative of the inclination of the cutting edge 251 relative to the axis of rotation of the carrier 24.
  • B--B indicates a line which connects the points of contact between the sharpening disc 33 and a cutting edge 251 when the sharpening disc 33 is in its uppermost position.
  • a indicates an angle through which the sharpening disc 33 can be turned upwards from a centre position; the sharpening disc 33 can be turned downwards by an equal angle so that the total angle of oscillations of the sharpening disc 33 amounts to 20c and is determined by the shape of the cam 65.
  • the slide 39 is reciprocatcd by means of the cam 61, rollers 60, the roller arm 59, the arm 57, the clamp 56 with its projection 58, the rack 54, the pinion 53, the shaft 50, the bevel gear wheels 46 and 45, the toothed wheel 44, the belt 43, the angular member 40 and the clamp 41.
  • the bearing 52 with the rack guides 55 follows the oscillations on the projections of the bearing 51C. This is enabled by the projection 58 forming a pivot and the rollers 13 being movable in the slots 14, so that the entire sharpening mechanism is moved by means of the guide members 4A in the transverse direction along the guide rods 3.
  • the feed of the sharpening disc 33 to the cutting edges 251 is effected by means of the transverse guide 38 and the feed slide 39 in known manner.
  • the reciprocating and oscillating movements are controlled in timed relationship by the cams 61 and 65 which are jointly rotatable by the control shaft 28 which is driven by any suitable drive which also drives the shaft 22 for rotating the cutters 25.
  • the cams 61 and 65 are shaped and keyed to the control shaft 28 in such a manner that during sharpening a line connecting the centre of the sharpening disc 33 to the instantaneous point of contact between the sharpening disc 33 and the rotating cutting edge 251 which is just being sharpened passes through the axis of the shaft 22, that is to say through the axis of rotation of the cutting edge 251.
  • An arrangement for sharpening a rotatable straight cutting edge while rotating comprising a rotatable carrier, at least one cutter attached to said carrier for rotation therewith, said cutter having a straight cutting edge inclined relative to the axis of rotation of said carrier so as to describe, when rotating, a surface of revolution of second order, a rotatable disc for sharpening said cutting edge while rotating, means for reciprocating said disc rectilinearly in the direction of said cutting edge while being sharpened, means for oscillating said disc in a curved path transversely to its own axis of rotation, and means for feeding said disc towards said cutting edge.
  • feeding means comprise a feed slide on which said motor is mounted, and means for guiding said feed slide in a direction transverse to the axis of rotation of said disc.
  • feeding means comprise a feed slide carrying said disc, and means for guiding said feed slide in a direction transverse to the axis of rotation of said disc.
  • said reciprocating means comprise a toothed driving belt, gear means meshing with said toothed driving belt, means for alternatingly rotating said gear means in opposite senses, thereby reciprocating said toothed driving belt, and means for fixing said guiding means to said driving belt.
  • said reciprocating means comprise a toothed driving belt, gear means meshing with said toothed driving belt, means for alternately rotating said gear means in opposite senses, thereby reciprocating said toothed driving belt, and means for linking said disc to said belt.
  • said means for alternately rotating said gear means in opposite senses comprise a rotatable cam, a follower co-operating I with said cam, a rack, linking means between said follower and said rack to reciprocate said rack, and means operatively connecting said rack to said gear means.
  • oscillating means comprise a second rotatable cam, a second follower co-operating with said second cam, a linkage between said follower and said disc for oscillating the same, said arrangement further comprising a rotatable shaft, said cam and said further cam being keyed to said shaft for joint rotation, whereby the operation of said reciprocating means is correlated to the operation of said oscillating means.
  • oscillating means comprise. a rotatable cam, a follower co-operating with said cam, and a linkage between said follower and said disc for oscillating the same.
  • said linkage comprises a first shaft, a first arm connected to said follower and oscillatable about said shaft, a sec ond arm connected to said first arm and oscillatable about said shaft, 21 second shaft, a rod pivoted to said second arm, a third arm pivoted to said rod and oscillatable about said second shaft, and a carrier rod carrying said disc and connected to said third arm.
  • a tobacco cutting arrangement comprising a rotatable carrier, at least one cutter attached to said carrier for rotation therewith, said cutter having a straight cutting edge inclined relative to the axis of rotation of said carrier so as to describe, when rotating, a surface of revolution of second order, a rotatable disc for sharpening 5 6 said cutting edge while rotating, the axis of rotation of References Cited said disc being substantially parallel to said cutting edge UNITED STATES PATENTS while being sharpened, means for reciprocating sa1d dlsc rectilinearly in the direction of its own axis of rotation, 1,149,255 8/1915 GlantZ 51249 means for oscillating said disc in a curved path trans- 5 3,144,063 8/ 1964 Schmermlmd 146117 versely to its own axis of rotation, and means for feeding said disc towards said cutting edge.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing Of Cigar And Cigarette Tobacco (AREA)
  • Manufacture Of Tobacco Products (AREA)
US475539A 1964-11-25 1965-07-28 Sharpening arrangements Expired - Lifetime US3374699A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB47832/64A GB1096901A (en) 1964-11-25 1964-11-25 Arrangements for sharpening rotating cutting edges

Publications (1)

Publication Number Publication Date
US3374699A true US3374699A (en) 1968-03-26

Family

ID=10446399

Family Applications (1)

Application Number Title Priority Date Filing Date
US475539A Expired - Lifetime US3374699A (en) 1964-11-25 1965-07-28 Sharpening arrangements

Country Status (6)

Country Link
US (1) US3374699A (de)
BE (1) BE672632A (de)
CH (1) CH429490A (de)
DE (1) DE1477903A1 (de)
FR (1) FR1458827A (de)
GB (1) GB1096901A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472107A (en) * 1966-01-11 1969-10-14 American Enka Corp Tow cutting apparatus having knife resharpening means
US4635402A (en) * 1984-03-15 1987-01-13 Japan Tobacco, Inc. Knife abrasive apparatus for rotary drum shaped cutter
US4718198A (en) * 1984-02-02 1988-01-12 Hauni-Werke Korber & Co. Kg. Apparatus for grinding cutting edges of knives in tobacco cutting machines
US5924914A (en) * 1997-07-21 1999-07-20 Engh; Harry W. Rotary cutter head knife jointer
US20120267458A1 (en) * 2009-09-29 2012-10-25 Dickinson Legg Limited Cutting and grinding apparatus

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2057314A (en) * 1979-08-31 1981-04-01 Morisaki Jutakusangyo Kk Super-surfacer for machining timber
DE8402941U1 (de) * 1984-02-02 1985-05-30 Hauni-Werke Körber & Co KG, 2050 Hamburg Vorrichtung zum Schleifen eines Schneidprofils zum Schneiden von Tabak
DE19817176A1 (de) * 1998-04-17 1999-10-21 Case Harvesting Sys Gmbh Vorrichtung zum Schleifen der Häckselmesser an Trommel-Häckselmaschinen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1149255A (en) * 1914-03-10 1915-08-10 Ludwig B Glantz Sharpening attachment for ensilage-cutters.
US3144063A (en) * 1961-01-18 1964-08-11 Schmermund Alfred Cutting machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1149255A (en) * 1914-03-10 1915-08-10 Ludwig B Glantz Sharpening attachment for ensilage-cutters.
US3144063A (en) * 1961-01-18 1964-08-11 Schmermund Alfred Cutting machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472107A (en) * 1966-01-11 1969-10-14 American Enka Corp Tow cutting apparatus having knife resharpening means
US4718198A (en) * 1984-02-02 1988-01-12 Hauni-Werke Korber & Co. Kg. Apparatus for grinding cutting edges of knives in tobacco cutting machines
US4635402A (en) * 1984-03-15 1987-01-13 Japan Tobacco, Inc. Knife abrasive apparatus for rotary drum shaped cutter
EP0155879A3 (en) * 1984-03-15 1988-09-07 Japan Tobacco Inc. Knife abrasive apparatus for rotary drum shaped cutter
US5924914A (en) * 1997-07-21 1999-07-20 Engh; Harry W. Rotary cutter head knife jointer
US20120267458A1 (en) * 2009-09-29 2012-10-25 Dickinson Legg Limited Cutting and grinding apparatus
US9474302B2 (en) * 2009-09-29 2016-10-25 Dickinson Legg Limited Cutting and grinding apparatus, method of manufacture of cut lengths of tobacco, and method for controlling the operation of a cutting apparatus

Also Published As

Publication number Publication date
BE672632A (de) 1966-03-16
GB1096901A (en) 1967-12-29
CH429490A (de) 1967-01-31
DE1477903A1 (de) 1970-06-18
FR1458827A (fr) 1966-11-10

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