EP0468254B1 - Dispositif de coupe transversale pour des bandes imprimées - Google Patents

Dispositif de coupe transversale pour des bandes imprimées Download PDF

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Publication number
EP0468254B1
EP0468254B1 EP91111231A EP91111231A EP0468254B1 EP 0468254 B1 EP0468254 B1 EP 0468254B1 EP 91111231 A EP91111231 A EP 91111231A EP 91111231 A EP91111231 A EP 91111231A EP 0468254 B1 EP0468254 B1 EP 0468254B1
Authority
EP
European Patent Office
Prior art keywords
suction
knives
pair
knife cylinder
knife
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
EP91111231A
Other languages
German (de)
English (en)
Other versions
EP0468254A3 (en
EP0468254A2 (fr
Inventor
Hilmar Vits
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen 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 Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0468254A2 publication Critical patent/EP0468254A2/fr
Publication of EP0468254A3 publication Critical patent/EP0468254A3/de
Application granted granted Critical
Publication of EP0468254B1 publication Critical patent/EP0468254B1/fr
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
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1845—Means for removing cut-out material or waste by non mechanical means
    • B26D7/1863—Means for removing cut-out material or waste by non mechanical means by suction

Definitions

  • the invention relates to a cross cutter for material webs provided with printed images according to the preamble of claim 1.
  • the knife roller has a slot between each pair of parallel knives, into which the waste strip is sucked in and pneumatically discharged through a hollow roller pin.
  • Such a cross cutter has not proven itself in practice because it can easily lead to blockages in the discharge channel.
  • An increase in the cross section of the discharge channel, which reduces the risk of clogging, is countered by the associated reduction in the stability of the knife roller. This applies in particular to the case where the knife roller is equipped with two pairs of parallel knives.
  • the hardened, smooth, synchronous counter-roller is assigned to the cutter block equipped with a pair of parallel cutters. This is studded with protruding needles, which pierce the material web so that the waste strip is held by them and is stripped on the opposite side by stationary teeth of a comb.
  • a device for cutting sheets or webs of material in which the waste pieces resulting from the cutting are held in place by negative pressure and are repelled by the supply of blown air at a point which is displaced and is suitable for removal.
  • the suction and blowing air is supplied and removed via a hollow shaft, hoses and valves.
  • such a device is rejected as unsuitable because of the effort required for this (DE-OS 19 28 966, page 2 below to page 3 above).
  • FR-A-2 392 916 discloses an apparatus for treating cut pieces which are cut out of a continuously running web. Between two axially parallel cylinders, a strip of material is cut out by knife pairs of a knife cylinder. The material strip is then taken over by a cylinder arranged under the knife cylinder. Circumferential openings of this further cylinder can alternately be connected to a source of blown air and a suction air during its rotation, so that the one initially sucked in Material strip is later repelled from the circumference of the other cylinder.
  • the curved surface of the further cylinder serves as the counter surface to the cutting edges of the cutting knives - hence a moving surface, which does not simplify the exact cutting setting in comparison to a stationary counter surface.
  • a further cylinder is also required in order to convey the material strips away from the conveying plane, so that trouble-free web travel is ensured.
  • a knife cylinder which is provided with a pair of knives, works together with a stationary counter knife. The narrow web strip separated by the cut is sucked through an opening into a hollow shaft around which the knife cylinder rotates.
  • the design chosen for this device removes the strips of material through the interior of the cylinder, which creates the risk of a jam that is difficult to clear. If several pairs of knives are arranged on the circumference of the knife cylinder, this principle reaches its limits, since an enormous suction air volume flow has to be generated in order to convey the strips back into the inside of the knife cylinder against the centrifugal force which detects them.
  • the invention has for its object to provide a cross cutter for material webs provided with printed images of the type mentioned, with which the resulting waste strips can be removed without problems with high performance without great expenditure on device technology.
  • the waste strips accumulating between the knives of a pair of knives are safely removed from the processing process even at high outputs, because it is possible by means of the valve control to apply a high vacuum and a high overpressure of the suction and blowing air source to the suction and blowing air openings lay.
  • the switching operations of the valve control with rapid pressure build-up and reduction required for the cross cutter to be used in printing shops can be easily mastered with special training of the valve control. With 30 print images per second, 60 air changes per second are necessary. Assuming 1/3 of a turn for the valve control switchover process, there is a period of a few milliseconds for the pressure build-up and release. With the from the relative movement of knife roller and fixed inlets and outlets of the suction and blown air source derived switchover can meet this requirement safely.
  • the suction hood has blowing air-operated floating nozzles with a conveying effect on the inside.
  • the waste strips can be protected against unintentional detachment by providing support levels set back between the knives and their cutting edges.
  • the knives have a certain shielding function for the waste strips.
  • a material web 1 provided with printed images is fed via a suspension table 2 to a cross cutter which consists of a rotating knife roller 3 with two pairs of parallel knives 4a, 4b and a stationary counter knife 5 with a knife 4c. Between the knives 4a, 4b, a series of suction and blowing openings 9 is arranged, which can be connected alternately to a suction and blowing air source via radial channels 17 in a manner to be described, depending on the rotational position of the knife roller 3.
  • the knife 4a In the position of the knife roller 3 shown in FIG. 1, the knife 4a has just cut a sheet 6 with the printed image from the material web 1 with the knife 4c, which sheet is removed via a floating table 7. A waste strip 8 which is still to be cut is held by the suction and blowing openings 9 which are subjected to negative pressure.
  • the knife 4b cuts off the waste strip 8 together with the knife 4c. This remains attached to the suction and blowing openings 9 until the suction and blowing openings are disconnected from the suction air source and connected to the blowing air source. This happens after at least 1/4 and at most 1/2, in particular 1/3, rotation of the knife roller 3 from the cutting position.
  • a suction hood 12 is arranged above the knife roller 3 and is equipped with a conveying action in the direction of arrow 11, 14 to form blown air nozzles 13 arranged on the inside.
  • the knife roller 3 webs 10 carry the suction and blowing openings 9, which consist of suction cups 9a and holding, axially pierced fastening screws 9b.
  • the axial channel of the fastening screws 9b opens into the channel 17, which in turn opens into an axial groove 16a of a rod 15, which is seated in a central bore in the knife roller 3.
  • two axial grooves 16a, 16b are arranged in the rod 15. They are sealed off from one another by sealing strips which are seated in grooves 18 and acted upon by an elastic hose.
  • connections 27a, 27b are provided at the ends of the two channels 16a, 16b, which abut tightly against a stationary distributor plate 25a, 25b with an inlet 26a and an outlet 26b.
  • the inlets and outlets 26a, 26b are rotatably offset relative to one another in such a way that when the suction and blowing openings 9 are in the cutting position, these with the inlets 26a for suction air (see FIG. 4 below) and the suction and blowing openings 9 which are not in the cutting position with the Outlets 26b for blown air (see FIG. 4 above) are connected.
  • the rotational displacement of the inlets and outlets 26a, 26b is such that, on the one hand, the waste strips are held long enough and, on the other hand, are blown off sufficiently early for removal. This can mean that the inlets and outlets 26a, 26b must not be diametrically opposite.
  • the stationary distributor plates 25a, 25b are screwed to hollow pins 24a, 24b, which in turn are connected to the lines Suction and pressure medium sources are connected.
  • the stationary hollow pins 24a, 24b are mounted by means of bearings 28a, 28b in a hollow bearing pin 3a of the knife roller 3.
  • the pressure required for sealing between the distributor plate 25a and the connections 27a, 27b is applied by a spring 30 which is supported on the one hand on a threaded ring 29 seated in the hollow pin 3a and on the other hand on the axially fixed on the hollow pin 24b in the form of an angular contact ball bearing 28b.
  • a side channel compressor of 100 mbar working pressure can be used for suction and blown air, with a pressure loss of 50% due to resistance.
  • the vacuum of 50 mbar under normal pressure with a total resistance figure of 12.5 is 4 milliseconds for covered and 8 milliseconds for free Suction cups with 2 mm bore used in the fastening screws 10.
  • the knife travel is 40 or 80 mm, corresponding to an angular travel of 22.5 degrees or 45 degrees.
  • the opening and closing of the openings of 12.5 mm diameter with 15 mm eccentric position takes 8 milliseconds with an angular path of 45 degrees each.
  • the time for switching from suction to bubbles is just short enough to ensure trouble-free operation on 1/4 rotation of the cutter roller 3 at 30 sheets per second, which corresponds to a speed of 900 revolutions per minute.
  • a centrifugal force of 180 g acts on a 1 m wide waste strip with a weight of 2 g.
  • the holding force on the suction cups 9a of 10mm inner diameter in 30mm division is 1250g and the repulsive force of the blowing openings 9b of 2mm diameter is 50g.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Cutting Devices (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Laminated Bodies (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (2)

  1. Guillotine pour nappes de matière comportant des sujets imprimés, se composant d'un cylindre porte-lames (3) supportant au moins deux lames parallèles (4a, 4b), ainsi que d'une contre-lame (4c) montée en position fixe et d'un dispositif d'évacuation (9, 12) fonctionnant par aspiration d'air pour les bandes de chute (8) qui sont produites entre les deux lames (4a, 4b) lors de la coupe transversale,
       caractérisée en ce que le dispositif d'évacuation comprend entre les lames (4a, 4b) de chaque paire de lames des orifices d'aspiration et d'insufflation (9) dont chacun peut être raccordé à une source d'air d'aspiration et d'air d'insufflation par un canal (16a, 16b, 17) passant dans le cylindre porte-lames (3) et au moyen d'une commande par distributeurs (25a, 25b, 26a, 26b, 27a, 27b) en fonction de l'angle de rotation du cylindre porte-lames (3) en rotation, de manière que les orifices d'aspiration et d'insufflation d'air (9) de chaque paire de lames soient raccordés lors de la coupe à la source d'air d'aspiration et à la source d'air d'insufflation dans une plage angulaire qui est décalée par rapport à la position angulaire de la coupe produite par les deux lames, chaque commande par distributeurs (25a, 25b, 26a, 26b, 27a, 27) étant disposée sur le cylindre porte-lames (3), une admission (26a) étant réalisée en position fixe sur un côté extrême et une sortie (26b) d'air d'aspiration et d'air d'insufflation décalée angulairement par rapport à l'admission étant réalisée sur l'autre côté extrême du cylindre porte-lames (3), chacune desdites commandes comprenant également des raccord (27a, 27b) du canal (16a, 16b) menant aux et provenant des orifices d'aspiration et d'insufflation (9) des deux lames correspondantes, ces raccords balayant successivement l'admission et la sortie (26a, 26b) pendant une rotation du cylindre porte-lames (3), chaque côté extrême du canal comportant un raccord (27a, 27b) et le canal recevant une dépression pendant le balayage de l'admission (26a) et une surpression pendant le balayage de la sortie (26b) et le dispositif d'évacuation comprenant une hotte d'aspiration (12) qui est disposée au-dessus du cylindre porte-lames (3) de manière que les bandes de chute (8) repoussées par l'air d'insufflation puissent être aspirées dans la hotte d'aspiration (12).
  2. Guillotine selon la revendication 1, caractérisée en ce que des plans d'appui disposés entre les lames (4a, 4b) et décalés vers l'arrière par rapport au fil de ces dernières sont prévus pour les bandes de chute (8).
EP91111231A 1990-07-21 1991-07-05 Dispositif de coupe transversale pour des bandes imprimées Expired - Lifetime EP0468254B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4023257A DE4023257C2 (de) 1990-07-21 1990-07-21 Querschneider für mit Druckbildern versehene Materialbahnen
DE4023257 1990-07-21

Publications (3)

Publication Number Publication Date
EP0468254A2 EP0468254A2 (fr) 1992-01-29
EP0468254A3 EP0468254A3 (en) 1992-03-18
EP0468254B1 true EP0468254B1 (fr) 1995-02-22

Family

ID=6410770

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91111231A Expired - Lifetime EP0468254B1 (fr) 1990-07-21 1991-07-05 Dispositif de coupe transversale pour des bandes imprimées

Country Status (4)

Country Link
EP (1) EP0468254B1 (fr)
JP (1) JPH0725057B2 (fr)
AT (1) ATE118718T1 (fr)
DE (2) DE4023257C2 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK172150B1 (da) * 1992-05-18 1997-12-01 Ib Groenbjerg Maskine til at skære en papirbane op i ark under samtidig afskæring af en tværgående strimmel
DE4229699C2 (de) * 1992-09-05 1995-09-21 Heidelberger Druckmasch Ag Vorrichtung zur kontrollierten Beseitigung von Abfall-Stücken von Bedruckstoffen
DE59304886D1 (de) * 1992-10-30 1997-02-06 Grapha Holding Ag Vorrichtung für das Herstellen formatgleicher Bogen aus Materialbahnen
GB9226932D0 (en) * 1992-12-24 1993-02-17 Molins Plc Web cutting device
CA2142081A1 (fr) * 1994-02-18 1995-08-19 Gary R. Wunderlich Dispositif pour evacuer les chutes d'une scie transversale
WO1995028261A1 (fr) * 1994-04-13 1995-10-26 Winkler & Dünnebier Emporte-piece souple et cylindre-support
IT1269107B (it) * 1994-06-08 1997-03-21 Bruno Losi Perfezionamenti ad un metodo e ad una apparecchiatura per la separazione degli sfridi da un foglio fustellato di film adesivo su pellicola di supporto, in particolare per la produzione di etichette adesive
DE19532027A1 (de) * 1995-08-31 1997-03-06 Koenig & Bauer Albert Ag Verfahren und Vorrichtung zum Entfernen von auf Punkturnadeln befindlichen Beschnittstreifen
EP1125646B1 (fr) 2000-02-01 2003-08-06 Heidelberger Druckmaschinen Aktiengesellschaft Dispositif pour enlever des particules de bandes
DE10004305A1 (de) * 2000-02-01 2001-08-02 Heidelberger Druckmasch Ag Verfahren und Vorrichtung zur Entfernung von Partikeln von Materialbahnen
DE102004051143B4 (de) * 2004-10-20 2006-09-21 Maschinenfabrik Wifag Falzvorrichtung für eine Rollen-Rotationsdruckmaschine
DE202015008522U1 (de) * 2015-12-14 2016-01-19 Harro Höfliger Verpackungsmaschinen GmbH Vorrichtung zum Herauslösen von Teilbereichen aus einer Materialbahn
CN105398859A (zh) * 2015-12-15 2016-03-16 无锡宝南机器制造有限公司 数码书刊折页机旋转裁刀吹气结构
IT201700081301A1 (it) * 2017-07-18 2019-01-18 Tecnau Srl Equipaggiamento e metodo di taglio trasversale per strisce di rifilatura
CN111531604A (zh) * 2020-05-07 2020-08-14 黄碧芳 一种塑料加工用自动切管机
CN114102750B (zh) * 2021-12-03 2022-07-22 苏州艾美瑞光电科技有限公司 键盘遮光体打孔装置及打孔方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3548696A (en) * 1968-06-27 1970-12-22 Smithe Machine Co Inc F L Chip removal apparatus
FR2392916A1 (fr) * 1977-05-31 1978-12-29 Chambre Imprimerie Claude Dispositif pour effectuer des decoupages dans une bande de materiau defilant en continu
US4409870A (en) * 1980-09-15 1983-10-18 Blava In-Line, Inc. Apparatus for continuously cutting and removing thin trim strips from a printed web
EP0412383A3 (en) * 1989-08-11 1991-11-13 Jos. Hunkeler Ag Fabrik Fuer Graphische Maschinen Apparatus for cutting waste out of a running web

Also Published As

Publication number Publication date
ATE118718T1 (de) 1995-03-15
EP0468254A3 (en) 1992-03-18
DE4023257A1 (de) 1992-01-23
DE4023257C2 (de) 1993-12-02
DE59104663D1 (de) 1995-03-30
JPH04256598A (ja) 1992-09-11
JPH0725057B2 (ja) 1995-03-22
EP0468254A2 (fr) 1992-01-29

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