US3452943A - Slitting knives - Google Patents

Slitting knives Download PDF

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Publication number
US3452943A
US3452943A US3452943DA US3452943A US 3452943 A US3452943 A US 3452943A US 3452943D A US3452943D A US 3452943DA US 3452943 A US3452943 A US 3452943A
Authority
US
United States
Prior art keywords
web
knife
slitting
cutting edge
spindle
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
Application number
Other languages
English (en)
Inventor
Edouard Roger Armelin
Arthur Frederick Geor Plaskett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe dEtudes de Machines Speciales SA
Original Assignee
Societe dEtudes de Machines Speciales SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Societe dEtudes de Machines Speciales SA filed Critical Societe dEtudes de Machines Speciales SA
Application granted granted Critical
Publication of US3452943A publication Critical patent/US3452943A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B26D1/02—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 stationary cutting member
    • B26D1/025—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 stationary cutting member for thin material, e.g. for sheets, strips or the like
    • 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
    • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D5/02—Means for moving the cutting member into its operative position for cutting
    • 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
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • 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
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6584—Cut made parallel to direction of and during work movement

Definitions

  • This invention relates to improvements in slitting knives which are primarily intended for cutting flexible web materials such as paper and cardboard.
  • the slitting knife is adapted to bear on the web material tangentially as it is rewound, slitting it to form the desired narrower rolls. Further the knife is made much longer than would normally be the case and is provided with an extended cutting edge along its length. In use initially such a knife is brought to bear on the web to be slit with the cutting edge at one end of the knife in contact therewith. As the slitting takes place and the cutting edge on the knife begins to wear, the slitting knife is moved progressively along its length so that a fresh cutting edge is continuously presented to the web.
  • the invention provides apparatus for slitting flexible web material, comprising a framework arranged to support a spindle carrying a roll of said web material for rotation in said framework and further arranged to support a further spindle for rotation in said framework, means for driving said further spindle to rewind said web from said roll onto said further spindle, and a knife pivotally mounted on said framework so as to bear on said web tangentially as it is rewound onto said further spindle and slit the web to form a plurality of narrower web rolls on said further spindle.
  • said knife is elongated and has a cutting edge provided therealong, and including 3,452,943 Patented July 1, 1969 means for progressively moving said cutting edge longitudinally relative to the point at which it contacts Said web.
  • a method of slitting flexible web material comprising unwinding a roll of said web material from a spindle, causing said web material to be rewound onto a further spindle under a knife cutting edge arranged to bear tangentially on said web as it is rewound onto said further spindle and slit said web to form a plurality of narrower web rolls on said further spindle.
  • FGURE 1 is a side elevation of a web slitting machine incorporating a slitting knife of the invention
  • FIGURE 2 is a part sectional view taken on the line IIII in FIGURE 1,
  • FIGURE 3 is a side elevation of a web slitting machine incorporating a further knife of the invention
  • FIGURE 4 is a view of the slitting knife taken in the direction of the arrow IV .in FIGURE 3, and
  • FIGURE 5 is a part sectional view taken on the line V-V in FIGURE 3.
  • FIGURE 1 shows the general arrangement of the machine for slitting a web into two parts.
  • the web 1 to be slit is on a reel 2 mounted freely on a spindle 3 on the machine frame 4.
  • the web 1 is wound simultaneously, as by an electric motor 30 and a belt 31, onto two reels 5 and 6 mounted on a common further spindle 7 on the machine frame 4.
  • a slitting knife 8 which bears tangentially thereon.
  • the knife 8 is in the form of a thin strip of steel having a cutting edge 9 formed along its entire or substantially its entire length.
  • the knife holder 10 is slidably mounted within an arm 11 which is itself pivotally mounted on the machine frame 4 at a point 12.
  • a tension spring 13 is provided between the arm 11 and the machine frame 4 and arranged so that it maintains the knife in constant slitting engagement with the web 1 as it is rewound onto the reels 5 and 6.
  • the back of the knife holder 10 has a rack out thereon which engages with a gear pinion 14 rotatably mounted concentrically to the pivot point 12 of arm 11.
  • a gear pinion 14 rotatably mounted concentrically to the pivot point 12 of arm 11.
  • FIGURES 3, 4 and 5 web slitting machine similar to that of FIGURE 1 is shown, as a further embodiment of a slitting knife of the invention.
  • those parts which are similar to those shown in FIGURES 1 and 2 are given like reference numerals.
  • the arrangement of the web 1 and its reel 2 and rewind reels 5 and 6 0n the machine frame 4 is similar to that of FIGURE 1.
  • the slitting knife however is in the form of a ribbon of steel provided in a coil 16.
  • the coil 16 is mounted on the top of an arm 17 which is pivotally mounted on the machine base 4 at a point 12 in a similar manner to the arm 11 in FIGURE 1.
  • the knife ribbon 15 is drawn from the reel 16 and passes through the nip between a pair of small rollers 18 and 19 which are rotatably mounted on the arm 17.
  • the roller 19 is carried by a shaft 20 which passes through the arm 17 and has a worm wheel 21 fixed thereon at the opposite end from the roller 19.
  • the worm wheel 21 is arranged in mesh with a worm gear 22 which is rotatably mounted on the machine frame concentrically to the pivot point 12 of the arm 17.
  • the knife ribbon 15 In order that the knife ribbon 15 is maintained with its cutting edge correctly aligned with the web, it is arranged to pass through a guide slot formed in the arm 17 which closely fits the knife ribbon 15 and affords the required support while allowing it to slide therethrough.
  • the arm 17 is biased towards the web 1 by means of tension spring (not shown) in a similar manner to that for arm 11 of FIGURE 1.
  • the worm 22 can be arranged for manual or automatic rotation as by the motor an da belt 32, with the result that the ribbon 15 is drawn past its point of contact with the web 1 and a fresh cutting edge thereon is continuously presented to the web.
  • the entire knife ribbon has been consumed it is discarded and a fresh one fitted.
  • either of these embodiments of the invention will provide means whereby a freshly sharpened cutting edge is continuously presented to the web to be slit and correct slitting of the web will be maintained despite wear caused to the cutting edge.
  • An apparatus for slitting flexible web material comprising:
  • a first spindle rotatably mounted on said framework so as to support a roll of the web to be slit;
  • said knife means pivotally mounted on said framework, said knife means having a cutting edge formed substantially along its entire length and arranged to bear on said web tangentially and thus slit said Web as it curves over said second spindle during rewinding, said knife means comprising:
  • said knife strip draw means includes a pair of rollers rotatably mounted on said arm in such position that said knife strip may pass through a nip between them on leaving said guide slot, and one of said rollers being arranged to be driven so as to draw said knife strip from said coil.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Treatment Of Fiber Materials (AREA)
US3452943D 1966-04-29 1967-04-17 Slitting knives Expired - Lifetime US3452943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1894566A GB1155002A (en) 1966-04-29 1966-04-29 Improvements in or relating to Slitting Knives

Publications (1)

Publication Number Publication Date
US3452943A true US3452943A (en) 1969-07-01

Family

ID=10121144

Family Applications (1)

Application Number Title Priority Date Filing Date
US3452943D Expired - Lifetime US3452943A (en) 1966-04-29 1967-04-17 Slitting knives

Country Status (5)

Country Link
US (1) US3452943A (fa)
BE (1) BE697766A (fa)
DE (1) DE1561734A1 (fa)
GB (1) GB1155002A (fa)
LU (1) LU53439A1 (fa)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US129319A (en) * 1872-07-16 Improvement in paper-cutting machines
US255638A (en) * 1882-03-28 krueger
AT73666B (de) * 1913-03-26 1917-08-25 Abadie Papier Ges M B H Einrichtung und Vorrichtung zur Herstellung von Blattmetallrollen.
US1926340A (en) * 1932-03-21 1933-09-12 Graham Paper Company Method of producing slitted-web paper rolls
US2747666A (en) * 1952-03-19 1956-05-29 Columbus Coated Fabrics Corp Slitting machine having two laterally movable outer knives and a center knife maintained midway between the outer knives

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US129319A (en) * 1872-07-16 Improvement in paper-cutting machines
US255638A (en) * 1882-03-28 krueger
AT73666B (de) * 1913-03-26 1917-08-25 Abadie Papier Ges M B H Einrichtung und Vorrichtung zur Herstellung von Blattmetallrollen.
US1926340A (en) * 1932-03-21 1933-09-12 Graham Paper Company Method of producing slitted-web paper rolls
US2747666A (en) * 1952-03-19 1956-05-29 Columbus Coated Fabrics Corp Slitting machine having two laterally movable outer knives and a center knife maintained midway between the outer knives

Also Published As

Publication number Publication date
LU53439A1 (fa) 1967-06-19
DE1561734A1 (de) 1969-12-18
BE697766A (fa) 1967-10-02
GB1155002A (en) 1969-06-11

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