EP0735938A1 - Procede et dispositif pour poin onner une pile d'objets - Google Patents

Procede et dispositif pour poin onner une pile d'objets

Info

Publication number
EP0735938A1
EP0735938A1 EP95933293A EP95933293A EP0735938A1 EP 0735938 A1 EP0735938 A1 EP 0735938A1 EP 95933293 A EP95933293 A EP 95933293A EP 95933293 A EP95933293 A EP 95933293A EP 0735938 A1 EP0735938 A1 EP 0735938A1
Authority
EP
European Patent Office
Prior art keywords
punch
punching
stack
knife
counter pressure
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
EP95933293A
Other languages
German (de)
English (en)
Other versions
EP0735938B1 (fr
Inventor
Michel G. Bruehwiler
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.)
Blumer Maschinenbau AG
Original Assignee
Blumer Maschinenbau AG
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 Blumer Maschinenbau AG filed Critical Blumer Maschinenbau AG
Publication of EP0735938A1 publication Critical patent/EP0735938A1/fr
Application granted granted Critical
Publication of EP0735938B1 publication Critical patent/EP0735938B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1818—Means for removing cut-out material or waste by pushing out
    • 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
    • B26D7/02—Means for holding or positioning work with clamping means
    • B26D7/025—Means for holding or positioning work with clamping means acting upon planar surfaces
    • 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
    • B26D7/06—Arrangements for feeding or delivering work of other than sheet, web, or filamentary form
    • B26D7/0608—Arrangements for feeding or delivering work of other than sheet, web, or filamentary form by pushers
    • 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
    • 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
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • 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
    • B26D2007/1881—Means for removing cut-out material or waste using countertools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F2210/00—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products
    • B26F2210/02—Perforating, punching, cutting-out, stamping-out, severing by means other than cutting of specific products of stacked sheets
    • 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
    • Y10T83/04—Processes
    • Y10T83/0448—With subsequent handling [i.e., of product]
    • Y10T83/0467—By separating products from each other
    • 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
    • Y10T83/04—Processes
    • Y10T83/0524—Plural cutting steps
    • Y10T83/0577—Repetitive blanking
    • 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
    • Y10T83/04—Processes
    • Y10T83/06—Blanking
    • 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
    • Y10T83/202—With product handling means
    • Y10T83/2033—Including means to form or hold pile of product pieces
    • Y10T83/2037—In stacked or packed relation
    • Y10T83/2046—Including means to move stack bodily
    • Y10T83/2048—By movement of stack holder
    • 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
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2098—With means to effect subsequent conveying or guiding
    • 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
    • Y10T83/202—With product handling means
    • Y10T83/2092—Means to move, guide, or permit free fall or flight of product
    • Y10T83/2096—Means to move product out of contact with tool
    • Y10T83/2122—By ejector within a hollow cutter
    • 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
    • Y10T83/869—Means to drive or to guide tool
    • Y10T83/8752—Tool moves work to and against cooperating tool
    • Y10T83/8756—Work forced through tool aperture or between spaced cooperating tools

Definitions

  • the invention relates to a method and a device for punching a stack of flat structures, in particular labels, according to the preamble of claims 1 and 3.
  • the present invention is based on the object of creating a stamping method which ensures both a high stamping quality and a high working speed of the stamping device.
  • the most important advantage of this invention is that a new stack of flat structures, in particular labels, can be put back into the punch, while at the same time the finished stamped stack of labels is still removed from the punch knife.
  • Deformations and / or impressions in the stamped labels, which result from the puncturing of the stamped stack with a plunger, as in the method with the device according to DE-A-40 13 071, are also particularly favorable Avoided way. Since the counterpressure stamp both generates counterpressure during punching and is also used to push back the punched stack, the mechanical outlay of the device according to the invention is also less. Further advantages of the invention result from the dependent claims and from the following description. There, the invention is explained in more detail using an example shown schematically in the drawings.
  • Fig.l a label punching device in side view
  • FIG. 2 shows an enlarged illustration of the label punching device according to FIG. 1,
  • FIG. 3 shows an enlarged top view of the label punching device according to FIG. 1,
  • FIG 5 shows some of the process stages of the punching process with the label punching device in a top view.
  • a label punching device 1 is shown very schematically, which essentially has a machine frame 2 with a punching ram 3, a punching knife 4 and a counter pressure stamp 5.
  • the punching ram 3 can be pushed back and forth in a ram cylinder 6 by means of a hydraulically operated piston (not shown here).
  • the punch knife 4 is held in a holder 8, with which the punch contour of the punch knife 4 can be adapted if necessary and other punch knives can be set up.
  • This holder 8 is designed in the manner of two screw clamps which set the punching contour in two dimensions which are perpendicular to one another.
  • the counter pressure ram 5 can be moved back and forth in a counter pressure cylinder 9 by means of a hydraulically or pneumatically actuated piston (not shown).
  • the holding device 8 and the impression cylinder 9 are fastened on a slide 10.
  • the carriage 10 itself is mounted on a cantilever 11 on the machine frame 2 such that it can be moved back and forth by means of a piston and cylinder unit, not shown here.
  • the slide 10 can be fixed by means of a mechanical locking device (not shown here) for the actual punching process. This locking can be obtained in a manner known per se by means of a non-positive locking or also hydraulically.
  • the punch 4 can be moved in an inclined plane 12, which forms an angle of approximately 25 ° with the horizontal or horizontal plane.
  • the boom 11 is attached to the machine frame 2 parallel to this plane 12, so that the carriage 10 is also movably mounted parallel to the inclined plane 12.
  • the piston of the counter-pressure cylinder 9, which is not visible in FIG. 1, is connected to a piston rod 14 and a cylindrical pressure tappet 15.
  • the counter pressure stamp 5 has a rotation-proof guide rod 18 with a cylindrical head part 19.
  • the longitudinal axis of the stamping ram 3, the longitudinal axis of the counter-pressure ram 5 and the longitudinal axis of the counter-pressure cylinder 9 are aligned in the inclined plane 12.
  • the pressure ram 15 lies loosely with a flat surface on this cylindrical head part 19, ie is non-positively connected to it.
  • the holder 8 for the punching knife 4 is fastened on the carriage 10 so as to be displaceable in directions perpendicular to the inclined plane 12, so that it can be displaced independently of the impression cylinder 9 in order to move the punching knife 4 onto the desired label contour in the directions of displacement perpendicular to the direction of movement to be able to adjust.
  • the impression cylinder 9 is also mounted on the carriage 10 such that it can be displaced perpendicular to the inclined plane 12. In FIGS. 2 and 3 this is indicated by the arrows 22 and 23 and the displaceability of the pressure ram 15 is also indicated by dashed lines.
  • the punch knife 4, the counter pressure stamp 5 with the cylindrical head part 19 and the holder 8 form a unit which can be displaced on the slide 10 and which can be aligned as a whole with the punched material 7, for example on the printed image of a label.
  • a slight displacement of the cylindrical head part 19 from the direction of movement has no influence on the pressure distribution in the stack 7.
  • FIGS. 4 and 5 shows a side layer of the label punching device 1 as in FIGS. 1 and 2
  • FIG. 5 shows a plan view as in FIG. 3.
  • the three last steps of the punching process are illustrated with the aid of FIG.
  • the coordinates A, B, C and D given below are to be understood as abscissas with respect to the inclined plane 12.
  • the coordinate E lies on an axis perpendicular to the inclined plane 12.
  • the basic position of the label punching device 1 is shown in FIG. 4a.
  • the punching ram 3 is in an initial position A 0 , in which the stack 7 of pre-cut labels is aligned with the punching ram 3 becomes.
  • the carriage 10 with the punching knife 4 is in the punching position B Q , in which the carriage 10 is fixed by means of the mechanical locking mentioned above.
  • the pressure ram 15 is in an initial position C Q , which at the same time defines the initial position D Q of the counter pressure ram 5, in which the counter pressure ram 5 projects over the punching knife 4 with a slight projection (see also FIGS. 2 and 3).
  • the coordinates CQ and DQ are related to the coordinate BQ of the slide 10, ie are defined in the moving coordinate system of the slide 10.
  • FIG. 4b The next step is shown in FIG. 4b, in which the stack 7 of pre-cut labels is pushed with the punch 3 against the counter-pressure stamp 5 into the end position A ⁇ .
  • the counter pressure stamp 5 presses against the punched material with a predetermined and constant force, whereby the stack 7 is stabilized and fixed, and at the same time the air still present between the sheets is pressed out.
  • the stack 7 is then pushed in by the punching knife 4, the pressure ram 15 being pushed into the end position C 1 and the counter pressure plunger 5 into the end position 4.
  • the stack 26 of punched labels located in the punch knife 4 is then pressed out of the punch knife 4 by the counter pressure stamp 5 and pushed onto the receiving device 25.
  • the pressure ram 15 and the counter pressure stamp 5 are then again in their initial positions C Q and DQ, the counter pressure stamp 5 projecting again with a slight projection over the front edge of the punching knife 4.
  • the receiving device 25 with the stack 26 of finished labels is moved laterally out of the punching area into the transfer position Ei, and the stack 26 can then be fed to further processing such as a banding unit.
  • the carriage 10 is brought back according to the punching position B Q Fig. 4a, and can nem next working cycle of the stacking newly presented are punched 7-scale structures in egg ⁇ .
  • the punching knife 4 with the counter pressure stamp 5 does not necessarily have to be movably mounted on a carriage 10.
  • the label punching device 1 described could also have the punch 4 movably mounted on a carriage and the punch 4 fixed to the machine frame 2, and in this way there was space between the punch 3 and the punch 5 to remove the stack 26 to create die-cut labels. It is also not absolutely necessary for the carriage 10 to move parallel to the inclined plane 12, but could also create the necessary space by a direction of movement at right angles to it. However, with such a variant the mechanical structure of the label punching device becomes more complicated again, which is avoided as far as possible with the preferred embodiment shown and shown in the figures.

Landscapes

  • 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)
  • Making Paper Articles (AREA)

Abstract

L'invention concerne le poinçonnage d'une pile (7) d'objets plats, notamment d'étiquettes en papier ou en demi-carton, à l'aide d'un poinçon de perforation (4), d'un pilon de perforation (3) déplaçable en va-et-vient sur le poinçon de perforation (3) et d'un contre-poinçon (5) guidé à travers le poinçon de perforation (4), ce dernier (4) et le contre-poinçon (5) étant montés sur un chariot (10) se déplaçant en va-et-vient par rapport au pilon de perforation (3). Un dispositif collecteur (26) se déplaçant en va-et-vient latéralement par rapport à la zone de poinçonnage peut ainsi enlever la pile poinçonnée (21), et simultanément, une nouvelle pile (7) de feuilles prédécoupées peut être présentée devant le pilon de perforation (3).
EP95933293A 1994-10-20 1995-10-17 Procede et dispositif pour poinconner une pile d'objets Expired - Lifetime EP0735938B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH315494 1994-10-20
CH3154/94 1994-10-20
CH03154/94A CH689275A5 (de) 1994-10-20 1994-10-20 Vorrichtung und Verfahren zum Stanzen eines Stapels.
PCT/CH1995/000241 WO1996012593A1 (fr) 1994-10-20 1995-10-17 Procede et dispositif pour poinçonner une pile d'objets

Publications (2)

Publication Number Publication Date
EP0735938A1 true EP0735938A1 (fr) 1996-10-09
EP0735938B1 EP0735938B1 (fr) 2001-07-04

Family

ID=4249786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95933293A Expired - Lifetime EP0735938B1 (fr) 1994-10-20 1995-10-17 Procede et dispositif pour poinconner une pile d'objets

Country Status (6)

Country Link
US (1) US5768963A (fr)
EP (1) EP0735938B1 (fr)
CA (1) CA2179069C (fr)
CH (1) CH689275A5 (fr)
DE (1) DE59509382D1 (fr)
WO (1) WO1996012593A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6075965A (en) * 1996-07-29 2000-06-13 Eastman Kodak Company Method and apparatus using an endless web for facilitating transfer of a marking particle image from an intermediate image transfer member to a receiver member
EP2944440A1 (fr) 2014-05-15 2015-11-18 Blumer Maschinenbau Ag Dispositif et procédé d'estampage destinés à produire des étiquettes
EP3524398A1 (fr) 2018-02-12 2019-08-14 Blumer Maschinenbau Ag Dispositif d'estampage destiné à fabriquer des étiquettes moulées

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Publication number Priority date Publication date Assignee Title
DE19847552A1 (de) * 1998-10-15 2000-04-20 Schuler Pressen Gmbh & Co Vorrichtung zum Stanzen und Paketieren von Stanzblechen
DE19847551A1 (de) * 1998-10-15 2000-04-20 Schuler Pressen Gmbh & Co Vorrichtung zum Stanzen und stanzbildgerechten Stapeln von Stanzblechen
ES2168238T3 (es) * 1999-11-23 2005-03-16 Blumer Maschinenbau Ag Procedimiento y dispositivo para la produccion de pilas acabadas de estructuras planas a partir de una pila basica.
DE10023932A1 (de) * 2000-05-17 2001-11-22 Mohr Adolf Maschf Vorrichtung zum Stanzen eines Stapels aus blättrigem Gut
ATE337893T1 (de) * 2004-03-08 2006-09-15 Mohr Adolf Maschf Stanze zum konturenstanzen eines vorgeschnittenen nutzenstapels
JP2007260820A (ja) * 2006-03-28 2007-10-11 Ngk Insulators Ltd 高アスペクト比な貫孔部を有する工業用部品の製造方法
CH707264A2 (de) * 2012-11-21 2014-05-30 Blumer Maschb Ag Verfahren zum Bilden von Formetikettenstapeln.
BE1022742B1 (nl) * 2015-02-24 2016-08-26 VERSTRAETE IN MOULD LABELS, naamloze vennootschap Automatische stansmachine.
DE102015106244A1 (de) * 2015-04-23 2016-10-27 Engelhardt-Druck Gmbh Durchstoßstanzverfahren zur Herstellung von Etiketten
ES2967366T3 (es) * 2021-03-11 2024-04-29 Adolf Mohr Maschf Gmbh & Co Kg Procedimiento para el troquelado de contorno de una pila inicial de material en hojas, así como dispositivo de troquelado para la realización del procedimiento

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US2483735A (en) * 1947-02-15 1949-10-04 Printing Machinery Company Machine for die-cutting paper
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US3290977A (en) * 1965-09-01 1966-12-13 Printing Machinery Company Die cutting machines for labels and the like
CH438907A (de) * 1966-06-21 1967-06-30 Frey Wiederkehr & Cie Aktienge Verfahren zum Ausstanzen von Zuschnitten aus einem Stapel blattförmigen Materials und Vorrichtung zur Durchführung des Verfahrens
US3546990A (en) * 1967-05-29 1970-12-15 Frey Wiederkehr & Cie Ag Brief Method and apparatus for die cutting blanks from stacks of sheet material
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JPS63165031A (ja) * 1986-12-26 1988-07-08 Kosumetsuku:Kk プレス機械の加工板孔あけ用ノツクアウト装置
DE4013071A1 (de) * 1990-04-21 1991-06-13 Gerhard Busch Gmbh Graphische Vertkale stanzvorrichtung
EP0482435A3 (en) * 1990-10-25 1993-06-30 Hans Blumer Method and device for determining the position of an element for marking a separation of flat articles in a pile

Non-Patent Citations (1)

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Title
See references of WO9612593A1 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6075965A (en) * 1996-07-29 2000-06-13 Eastman Kodak Company Method and apparatus using an endless web for facilitating transfer of a marking particle image from an intermediate image transfer member to a receiver member
EP2944440A1 (fr) 2014-05-15 2015-11-18 Blumer Maschinenbau Ag Dispositif et procédé d'estampage destinés à produire des étiquettes
EP3524398A1 (fr) 2018-02-12 2019-08-14 Blumer Maschinenbau Ag Dispositif d'estampage destiné à fabriquer des étiquettes moulées

Also Published As

Publication number Publication date
DE59509382D1 (de) 2001-08-09
CH689275A5 (de) 1999-01-29
WO1996012593A1 (fr) 1996-05-02
EP0735938B1 (fr) 2001-07-04
CA2179069A1 (fr) 1996-05-02
CA2179069C (fr) 2000-01-11
US5768963A (en) 1998-06-23

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