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EP0552396A1 - Schneidvorrichtung - Google Patents

Schneidvorrichtung Download PDF

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Publication number
EP0552396A1
EP0552396A1 EP92102201A EP92102201A EP0552396A1 EP 0552396 A1 EP0552396 A1 EP 0552396A1 EP 92102201 A EP92102201 A EP 92102201A EP 92102201 A EP92102201 A EP 92102201A EP 0552396 A1 EP0552396 A1 EP 0552396A1
Authority
EP
European Patent Office
Prior art keywords
blade
bar
slot
cutting
roll
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.)
Granted
Application number
EP92102201A
Other languages
English (en)
French (fr)
Other versions
EP0552396B1 (de
Inventor
Donald J. Steidinger
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.)
Individual
Original Assignee
Individual
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
Priority claimed from US07/823,963 external-priority patent/US5224408A/en
Priority claimed from US07/828,187 external-priority patent/US5211096A/en
Application filed by Individual filed Critical Individual
Publication of EP0552396A1 publication Critical patent/EP0552396A1/de
Application granted granted Critical
Publication of EP0552396B1 publication Critical patent/EP0552396B1/de
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
    • 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
    • B26D7/2628—Means for adjusting the position of the cutting member

Definitions

  • This invention relates to apparatus for cutting and more particularly the mounting of cutting blades in a rotating cylinder for cutting or perforating continuous webs of paper, plastic, fabric, etc. More specifically, the invention applies to the manner in which the cutting blade is adjusted, supported, clamped, and changed.
  • a widely used method of doing this is to use steel rule cutting blades clamped in a slot of a rotating cylinder or roll. The blades cut against a hardened steel impression cylinder or roll. A plurality of cutting rules are mounted around the circumference of the cylinder. The blades are first clamped lightly, the cylinder rotated one revolution to seat each blade in contact with the impression cylinder, then the blades are securely clamped before cutting any paper, plastic, fabric, etc.
  • a second problem is the long time it takes to install new blades.
  • the blades are typically held by a series of clamping screws each one of which must be set to a proper torque for the first revolution of the cylinder, and then tightened for the final clamping. If the torque for the first setting is too low, the blades will not cut. If it is too high, the blades will hit too hard giving short blade life and severe wear and tear on the bearings, drive gears, etc. If the blades are extended too far out of the blade cylinder slot for the first revolution, they can be permanently bent, and thus ruined -- as a bent blade will not cut cleanly.
  • the difficulty of setting cutting blades by this method results in many blades being set improperly requiring resetting, short blade life or poor quality cuts.
  • Another objective is to provide a mounting that is not adversely affected by changes in cylinder center distances due to heating.
  • Another objective is to provide a mounting that can accept non-uniform blade contact due to runout in the blade or impression cylinders.
  • Another objective is to provide a mounting that does not require a first clamping and then a final lock up clamping operation.
  • Another objective is to provide a mounting that permits fast changing of blades without the use of many clamping screws.
  • Still another objective is to provide a blade mounting that does not require the high clamping forces necessary in present systems.
  • Another objective is to provide a blade mounting that is quick and easy for the operator to make very accurately.
  • Another objective is to provide a blade mounting that permits the operator to change blades using nominal force without special tools, withdrawal devices, etc.
  • Another object is to provide for accurate adjustment of the blade height that is easily and quickly made by the machine operator.
  • Still another object is to provide a restraint to prevent the blade from "walking", i.e., moving across the width of the cylinder during the course of many cutting operations.
  • a blade cylinder operating in conjunction with an impression cylinder, the blade roll having an axially extending slot receiving a bar means supported from the slot bottom, the bar means being equipped with generally circumferentially extending ledge means at the bottom thereof, a blade mounted on the ledge means and supporting means for the bar offset from the center of the blade resulting in both radial and circumferential forces on the blade during the actual cutting operation.
  • the blade position is maintained by spring means bearing against the bar to exert a circumferential force against the bar means during that portion of a revolution of the blade cylinder when the blade is not actually cutting.
  • spring means bearing against the bar to exert a circumferential force against the bar means during that portion of a revolution of the blade cylinder when the blade is not actually cutting.
  • the numeral 10 designates generally the frame of the apparatus which rotatably supports a blade cylinder 11 and an impression cylinder 12. These are rotated by a gear train 13.
  • the numeral 14 designates the blade carried by the blade cylinder 11.
  • FIG. 2 One clamping arrangement for the blade 14 in the cylinder 11 is seen in FIG. 2.
  • a slot 15 is cut across the axial length of a rotating blade-holding or blade-carrying cylinder 11.
  • Blade 14 is mounted between the bar 16 and one side wall 17 at ledge 18.
  • the blade edge 19 is supported at some chosen distance above the blade cylinder 11 surface so that it just contacts impression cylinder 12 if cutting is to be through all plies or at some precise chosen distance short of impression cylinder 12 if the cutting is to be through only some of the plies.
  • the bar 16 is pressed against the blade 14 by springs 28 clamping the blade between slot wall 17 and part 22.
  • This clamping force is relatively small and is used to hold the blade when cutting is not actually taking place.
  • the cutting force C on the blade causes a torque T on part 22 clamping blade 14 much more securely.
  • the cutting force C results in a radially inward force on the ledge 18 tending to pivot part 22 around the point 29 (see FIG. 2). This causes the base 30 to move to the right in FIG. 2 to take up the clearance 31 -- thus resulting in torque T.
  • a small clearance 31 is desirable in order to easily pivot part 22 without binding when changing blades 14.
  • the invention finds application both with a resilient base 30 or a rigid base 30.
  • the base 30 is advantageously rigid so as to maintain the tip 19 of the blade 14 in predetermined position. This also applies to cutting where the tip of the blade 14 comes just into "kissing" contact with the surface of the impression or anvil roll 21.
  • the interference is taken up by virtue of having a resilient base 30.
  • the blade height is adjusted upwards until only the one or two plies are cut as desired.
  • a rigid pad 30 is used, so there is negligible downward movement of blade 14 at the time of cutting but the cutting force C is essentially of the same magnitude and creates the blade clamping torque T through there is negligible actual movement of bar 16.
  • the bar 16 of this invention is made of two parts 22 and 23 which have tapered surfaces 24 and 25 in engagement.
  • the U-shaped part 22 which supports the blade 14 ordinarily is restrained from movement across the length (i.e., the axial dimension) of the slot 15 by bearers, viz., discs affixed to the ends of roll 11 or other means well known in the art.
  • the part 23 has means to be moved along the length of slot 15 thus raising and lowering the height of blade 14 by means of the inclined surfaces 24 and 25.
  • the means for indicating the amount of adjustment of blade 14 upwards or downwards can be very simple and accurate because a large movement of part 23 in relation to part 22 results in a small adjustment of blade height.
  • a reference graduation 27 is positioned on a part 22 (see FIG. 5).
  • Cooperating graduation marks 26 are provided on part 23 to indicate a convenient change in blade height, advantageously 0.001 inch when part 23 is moved the distance of one graduation.
  • the graduations are spaced much further apart than the adjustment made due to the ratio of change in blade height to movement of part 22 resulting from the angle of incline used on surfaced 24 and 25. It may be advantageous in certain instances to interchange the graduations on the parts 22 and 23 still providing the same result and indication.
  • FIG. 6 shows an arrangement using a rack and pinion that is especially advantageous for the machine operator.
  • a form of a T-handled key is used.
  • the key has pinion gear portion 33 and a cylindrical end portion 35 shown in FIG. 7.
  • the key is inserted through hole 34 in part 22 with the cylindrical end portion 35 in hole 36 in part 23 and pinion gear portion 33 engaged in rack 32.
  • By rotation of the pinion 33 in one direction or the other part 23 is caused to move in relation to part 22 thus causing the blade height to be raised or lowered accordingly.
  • Height adjustment is advantageous in normal cutting and perforating operations where the cutting is through all plies and which thereby enhances blade life and smooth, quiet running. This adjustment becomes especially advantageous when the cutting is to be through some but not all of multiple plies passing through the cutting station or roll nip simultaneously.
  • a base 30 that is resilient and, in fact, may be a spring.
  • the base 30 supports the bar such that the cutting edge 19 of the blade 14 is a few thousandths of an inch above the radius of cutting so that the blade and bar will be pressed downward into slot during the actual cutting operation.
  • the downward movement of the bar 14 compresses base 30 developing a force C sufficient to cut the material being processed.
  • the cutting force also creates a torque T that securely clamps the blade 14 against slot wall 17 during the actual cutting operation.
  • clamping force provided by springs 28 be modest so the operator finds it easy to move the bar to release the blade when installing or removing the blade. Excessive spring forces can result in deformation or damage to the bar when applying sufficient force to release the blade.
  • the bar clamps the blade by friction between the adjacent slot side wall and the clamping bar.
  • This clamping force must be substantially higher than the radial cutting force.
  • the clamping force is of at least 200 lbs. per inch and in actual practice much more than that in order to insure adequate clamping.
  • the circumferential force on the blade due to the thickness of the material to be cut and the projection of the blade over cutting radius is about 10 lbs. per inch of width.
  • One method to remove and install blades can consist of providing the bar 16 with holes in the top of the bar to accept a pin punch or the like for the operator to use as a lever to open the gap and release the blade. Therefore, the blades can be changed much more quickly than when using the series of clamping screws as are now commonly used.
  • an inhibiting member which may take a variety of forms for frictional engagement with the blade.
  • a friction surface on the bar can engage one side of the blade 14.
  • the high friction surface has particles that contact only a relatively small area and are sharp enough to actually bite into the blade under the action of torque.
  • the cutting blades are usually made of steel hardened to 40 Rockwell B to about 55 Rockwell C to ensure long life.
  • the friction surface can be an abrasive material such as aluminum oxide, silicon carbide, or the like, typically ranging from 36 to 240 in grit size. Also employed to advantage are other high friction materials such as plasma coated tungsten carbide. A friction surface can be located on the slot wall 17 with equal effectiveness.
  • the invention will be used with cylinders in the field which are difficult to apply the friction surface to.
  • the friction surface can be applied to the bar with less difficulty, it is sometimes advantageous to have the friction surface on an easily replaceable, inexpensive member.
  • the friction surface can be located on a member intermediate the blade 14 and the bar 16 or a member intermediate the blade 14 and the cylinder wall 17.
  • a particularly advantageous intermediate member is an element constructed of approximately 0.010" thick spring steel coated with the friction surface as mentioned above and having opposed generally planar surfaces.
  • the friction coating can be on both surfaces of the intermediate member in which case no additional axial inhibiting means is required for the intermediate member. Also, it is advantageous to adhere the intermediate member to the adjacent cylinder or bar wall.
  • the coating may be only on one surface of the intermediate member and the member itself restrained against axial movement by the usual means at the ends of the slot such as bearers or bar retainers well known in the art which so limit the bar or other holder means for the blade. It will be appreciated that the blades are typically shorter than the slot, hence the need for inhibiting axial movement.
  • the pad 30 may not only be resilient but can also take the form of a spring.
  • the pad 30 made of polyurethane would function effectively as a spring on bar 16.
  • the spring force required is in the range of 100 lbs. to 500 lbs. per inch of length of the cutting blade.
  • a force F of 150 lbs. per inch is typical when cutting bond papers of .002 to .005 inch thickness.
  • the blade 14 is supported so that the cutting edge 19 will be moved downward against the force of springs when it contacts the anvil cylinder 12. It is desirable that the amount of downward movement be minimal but sufficient to absorb the errors due to manufacturing tolerances in the height of the cutting rules, changes in center distance due to heating of the frames, run out of the cylinders, etc.
  • a convenient amount for this dimension is about .010 inch when cutting paper and plastic materials of .002 to .005 thickness. This amount can be chosen to meet the specific demands of the installation.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Cutting Devices (AREA)
  • Nonmetal Cutting Devices (AREA)
EP19920102201 1992-01-21 1992-02-10 Schneidvorrichtung Expired - Lifetime EP0552396B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/823,963 US5224408A (en) 1990-12-13 1992-01-21 Apparatus for cutting
US823963 1992-01-21
US828187 1992-01-30
US07/828,187 US5211096A (en) 1990-12-13 1992-01-30 Apparatus for cutting

Publications (2)

Publication Number Publication Date
EP0552396A1 true EP0552396A1 (de) 1993-07-28
EP0552396B1 EP0552396B1 (de) 1996-06-19

Family

ID=27124776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920102201 Expired - Lifetime EP0552396B1 (de) 1992-01-21 1992-02-10 Schneidvorrichtung

Country Status (3)

Country Link
EP (1) EP0552396B1 (de)
DE (1) DE69211672T2 (de)
ES (1) ES2088034T3 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244151B1 (en) 1998-06-11 2001-06-12 Tamarack Products Inc. Apparatus for adjusting cutting bar
WO2010006572A1 (de) * 2008-07-16 2010-01-21 Ips Intelligent Pelletizing Solutions Gmbh & Co. Kg Stranggranulator mit schneidspaltverstellung
DE102009009820A1 (de) * 2009-02-20 2010-08-26 Krones Ag Schneidwerkzeug zum Schneiden von Etiketten

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933497A1 (de) * 1999-07-16 2001-01-18 Rieter Automatik Gmbh Vorrichtung zur Schneidspalteinstellung und Verfahren

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB988996A (en) * 1962-10-01 1965-04-14 Avisun Corp Shear type cutter
US3769868A (en) * 1971-04-19 1973-11-06 Strucker O Kg Transverse cutting machine
US4848202A (en) * 1987-10-29 1989-07-18 The Hamilton Tool Company Cut off or cross perforator or scoring cylinder with quick blade release
GB2231296A (en) * 1989-05-12 1990-11-14 Gd Spa Method of adjusting and controlling a cutting device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB988996A (en) * 1962-10-01 1965-04-14 Avisun Corp Shear type cutter
US3769868A (en) * 1971-04-19 1973-11-06 Strucker O Kg Transverse cutting machine
US4848202A (en) * 1987-10-29 1989-07-18 The Hamilton Tool Company Cut off or cross perforator or scoring cylinder with quick blade release
GB2231296A (en) * 1989-05-12 1990-11-14 Gd Spa Method of adjusting and controlling a cutting device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6244151B1 (en) 1998-06-11 2001-06-12 Tamarack Products Inc. Apparatus for adjusting cutting bar
WO2010006572A1 (de) * 2008-07-16 2010-01-21 Ips Intelligent Pelletizing Solutions Gmbh & Co. Kg Stranggranulator mit schneidspaltverstellung
DE102009009820A1 (de) * 2009-02-20 2010-08-26 Krones Ag Schneidwerkzeug zum Schneiden von Etiketten

Also Published As

Publication number Publication date
DE69211672D1 (de) 1996-07-25
ES2088034T3 (es) 1996-08-01
DE69211672T2 (de) 1996-10-24
EP0552396B1 (de) 1996-06-19

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