EP0686505A1 - Vorrichtung zum Abschneiden einer Bahn - Google Patents

Vorrichtung zum Abschneiden einer Bahn Download PDF

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Publication number
EP0686505A1
EP0686505A1 EP95401195A EP95401195A EP0686505A1 EP 0686505 A1 EP0686505 A1 EP 0686505A1 EP 95401195 A EP95401195 A EP 95401195A EP 95401195 A EP95401195 A EP 95401195A EP 0686505 A1 EP0686505 A1 EP 0686505A1
Authority
EP
European Patent Office
Prior art keywords
blade
strip
link
links
elements
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
EP95401195A
Other languages
English (en)
French (fr)
Other versions
EP0686505B1 (de
Inventor
Pierre Tesseraud
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
Application filed by Individual filed Critical Individual
Publication of EP0686505A1 publication Critical patent/EP0686505A1/de
Application granted granted Critical
Publication of EP0686505B1 publication Critical patent/EP0686505B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/18—Web break detection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/20—Safety devices preventing damage
    • B41P2233/21—Safety devices preventing damage by cutting the web in case of web break

Definitions

  • the invention relates to a strip cutting device or disconnector of sheet material, in particular a device intended, in the event of damage, to cut and retain a strip moving at high speed; the invention relates more particularly to such a device intended to be installed in a rotary printing press machine in which a strip of paper to be printed is entrained and must be cut transversely and almost instantaneously when such damage occurs, in particular when the strip torn up.
  • the strip cutting device (s) arranged on the paper path are preferably controlled by electronic detection means to cut the strip into one or more sections, in particular so as to protect the blanket cylinder.
  • the known devices nevertheless have the drawback of not allowing a sufficiently clean cut at certain speeds.
  • the tension is such that actuation of the device most often causes a sort of poorly controlled bursting of said strip instead of a clean and substantially rectilinear sectioning transversely.
  • the known devices do not allow to cut a relaxed strip.
  • safety devices must be provided to prevent the device from being activated if the operator has engaged his hand or a finger in the area of activity of the cutting blade.
  • One of the aims of the invention is to propose a new strip cutter device of simple and original design ensuring a clear sectioning of the strip while scrolling.
  • Another object of the invention is to propose a tape cutter device with intrinsic operational safety making it possible to avoid bodily accidents.
  • the strip is "accompanied" during the cutting operation, which allows a clean cut.
  • the sections of sectioned strip are retained and cannot be driven towards the cylinders.
  • the particular shape of the base makes it possible to tighten the latter at the cutting location, guaranteeing its cutting.
  • the kinematics of the movement are such that the blade remains recessed from the press during most of its travel, so that it is impossible for an operator inserting his finger or his hand into the cutting space be injured by the blade itself.
  • the force exerted by the jack on the mechanism only becomes significant in the last millimeters of the stroke so that an accidental triggering of the device will only result in contact between the press (and not the blade) and the finger or the operator's hand at a point in the stroke where the force exerted by the jack remains low and harmless.
  • a strip cutting device 11 is shown, more particularly intended for cutting a strip of paper 12 represented by a dashed line in FIGS. 1 and 3.
  • the direction of travel of the strip is here indicated by the arrow F.
  • the device comprises a frame 14 in the form of an elongated rectangular parallelepiped intended to be installed with its largest dimension oriented transversely to the direction of travel F of the strip 12.
  • a space 15 for the passage of the strip is provided in this frame .
  • the base is made of elastomeric material.
  • the mechanism 22 comprises at least two sets of links 23a, 23b arranged symmetrically with respect to a plane P parallel to the direction of movement of the strip.
  • Each assembly 23a or 23b thus comprises two links: a first link 24 and a second link 25.
  • Each first link 24 is articulated to said frame, at its upper part, by a first pin 27 parallel to the direction of travel of the strip and this connecting rod comprises a yoke 28 at its lower end, receiving a second pin 30 parallel to the first, which constitutes the axis of a joint 32 which will be called hereinafter: "control joint”.
  • Each second link 25 is hingedly attached to said first corresponding link 24.
  • the blade 17 is at least one press 34 extending parallel to the blade, are hingedly attached to each second link.
  • An actuating cylinder 35 or the like at its ends 39a, 39b respectively attached to the two control articulations 32 of the two sets of rods 23a and 23b.
  • each second link comprises two similar and parallel elements 38A, 38B, spaced apart and mounted tight at the ends of said corresponding second pin 30, outside the yoke 28 while the end 39a or 39b of the jack 35 is connected articulated in the middle of this pin 30 and inside the yoke 28.
  • the two presses 38A, 38B are symmetrical with respect to a median longitudinal plane of the frame 14.
  • Each has a heel 43 lined over its entire length with a sheath of elastomeric material.
  • the two heels are capable of being applied to the base 19 on either side of the groove 20 when the blade 17 engages therein.
  • the profile of the base 19 is such that the opening of the groove 20 is at a level higher than that of the bearing surfaces of the presses. In this way, even if the strip is relaxed when the device is triggered, it is re-stretched on either side of the groove at the time of cutting.
  • the mounting of the blade 17 is as follows. In the vicinity of each set of links 23a, 23b, the blade has a hole 45 through which a third journal 46 extends extending between the two elements 38A, 38B constituting said second link 25. At least one of the holes 45 is oblong in the direction of the blade.
  • Bracing means are inserted between the two elements 38A, 38B and the blade 17. More precisely, these bracing means consist of bars 49 attached to the blade and of elastic elements 50, here deformable washers of the "Belleville" type. ", stacked on either side of the blade on the pins 46. The bars 49 or blade holders allow to stiffen the blade whose thickness is of the order of 1 mm.
  • the elastic elements 50 are distributed in equal number on either side of the blade so that the latter is well positioned opposite the center of the groove 20.
  • This configuration is suitable for cutting relatively thin and not very resistant strips.
  • the tape cutter is reversible.
  • the blade is driven by the strip in the direction of travel during cutting can be excessive. It is therefore advantageous to modify the position of the blade 17 relative to the groove 20, upstream by considering the direction of travel of the strip. It should be noted that the system described easily allows this adaptation.
  • the elements 38A, 38B constituting the rods 25 are easily removable so that said elastic elements 50 can be distributed in different numbers on either side of the blade 17 depending on the resistance of the strip to be cut. We can therefore optimize the position of the blade relative to the groove.
  • the blade 17 is given the greatest possible clearance in the direction of travel F during sectioning, this clearance being compensated by a momentary compression of the elastic elements.
  • the strip is accompanied along its path, which absorbs shocks due to the sudden blade drive by the band.
  • the shape as shown of said second links 25 and consequently of the elements 38A, 38B is an important characteristic of the invention. As can be seen in FIGS. 1 and 2, these elements have an approximately L shape so that the points of attachment of the blade and the press are not in alignment with the control joint 32. More precisely, the arrangement is such that the attachment points (pins 46) between the two second links of the two assemblies 23a, 23b and the blade are more distant than the attachment points (pins 40) between these same second links and the press or presses 34, when the cylinder 35 is piloted in extension.
  • the jack 35 is a gas jack which develops only a moderate effort (of the order of 6 kg).
  • the kinematics imposed by the shape of the rods 25 is such that, during most of the travel (and in particular as long as the height of the space 15 still allows the finger or hand to be inserted therein) the blade remains set back relative to the heels 43 of the presses 34, that is to say above said heels in the example described.
  • the force of the jack transferred to the presses and subsequently to the blade at the time of cutting is proportional to the cotangent of the angle between the two links 24, 25. It therefore only becomes important in the last millimeters of the race.
  • the invention is not limited to cutting strips scrolling. We have seen in fact that the tension exerted on the material at the time of cutting makes it possible to cut a non-tensioned and stationary strip.
  • the device can therefore be used as a simple shear for cardboard or plastic.

Landscapes

  • Nonmetal Cutting Devices (AREA)
EP19950401195 1994-05-26 1995-05-23 Vorrichtung zum Abschneiden einer Bahn Expired - Lifetime EP0686505B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9406402 1994-05-26
FR9406402A FR2720330B1 (fr) 1994-05-26 1994-05-26 Dispositif coupe bande.

Publications (2)

Publication Number Publication Date
EP0686505A1 true EP0686505A1 (de) 1995-12-13
EP0686505B1 EP0686505B1 (de) 1997-11-05

Family

ID=9463538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950401195 Expired - Lifetime EP0686505B1 (de) 1994-05-26 1995-05-23 Vorrichtung zum Abschneiden einer Bahn

Country Status (3)

Country Link
EP (1) EP0686505B1 (de)
DE (1) DE69500975T2 (de)
FR (1) FR2720330B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1010504A2 (de) * 1998-12-14 2000-06-21 ERHARDT + LEIMER GmbH Vorrichtung zum Durchtrennen einer laufenden Warenbahn
EP2447069A1 (de) 2010-11-02 2012-05-02 Komori Corporation Bahnschneidevorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0037642A1 (de) * 1980-03-31 1981-10-14 Baldwin Technology Corporation Verfahren und Vorrichtung zum Schneiden von Band
DE3431686A1 (de) * 1984-08-29 1986-04-24 Werner J. 8901 Diedorf Kotterer Vorrichtung zum verhindern maschinenschaedigender wickler
EP0525450A1 (de) * 1991-07-23 1993-02-03 Grafotec Kotterer Gmbh Vorrichtung zum Durchtrennen und Halten einer gerissenen Bahn

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0037642A1 (de) * 1980-03-31 1981-10-14 Baldwin Technology Corporation Verfahren und Vorrichtung zum Schneiden von Band
DE3431686A1 (de) * 1984-08-29 1986-04-24 Werner J. 8901 Diedorf Kotterer Vorrichtung zum verhindern maschinenschaedigender wickler
EP0525450A1 (de) * 1991-07-23 1993-02-03 Grafotec Kotterer Gmbh Vorrichtung zum Durchtrennen und Halten einer gerissenen Bahn

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1010504A2 (de) * 1998-12-14 2000-06-21 ERHARDT + LEIMER GmbH Vorrichtung zum Durchtrennen einer laufenden Warenbahn
EP1010504A3 (de) * 1998-12-14 2003-03-26 ERHARDT + LEIMER GmbH Vorrichtung zum Durchtrennen einer laufenden Warenbahn
EP2447069A1 (de) 2010-11-02 2012-05-02 Komori Corporation Bahnschneidevorrichtung

Also Published As

Publication number Publication date
EP0686505B1 (de) 1997-11-05
FR2720330B1 (fr) 1996-07-05
DE69500975D1 (de) 1997-12-11
DE69500975T2 (de) 1998-06-10
FR2720330A1 (fr) 1995-12-01

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