EP0620173B1 - Détecteur pour détecter périodiquement la hauteur d'empilage - Google Patents

Détecteur pour détecter périodiquement la hauteur d'empilage Download PDF

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Publication number
EP0620173B1
EP0620173B1 EP94104376A EP94104376A EP0620173B1 EP 0620173 B1 EP0620173 B1 EP 0620173B1 EP 94104376 A EP94104376 A EP 94104376A EP 94104376 A EP94104376 A EP 94104376A EP 0620173 B1 EP0620173 B1 EP 0620173B1
Authority
EP
European Patent Office
Prior art keywords
stack
sensing
machine
lever
levers
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
EP94104376A
Other languages
German (de)
English (en)
Other versions
EP0620173A1 (fr
Inventor
Hans-Peter Hiltwein
Jochen Renner
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 EP0620173A1 publication Critical patent/EP0620173A1/fr
Application granted granted Critical
Publication of EP0620173B1 publication Critical patent/EP0620173B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H1/00—Supports or magazines for piles from which articles are to be separated
    • B65H1/08—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device
    • B65H1/18—Supports or magazines for piles from which articles are to be separated with means for advancing the articles to present the articles to the separating device controlled by height of pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/46—Supplementary devices or measures to assist separation or prevent double feed
    • B65H3/48—Air blast acting on edges of, or under, articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2402/00—Constructional details of the handling apparatus
    • B65H2402/50—Machine elements
    • B65H2402/54—Springs, e.g. helical or leaf springs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/50—Driving mechanisms
    • B65H2403/51—Cam mechanisms
    • B65H2403/512—Cam mechanisms involving radial plate cam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2553/00—Sensing or detecting means
    • B65H2553/60—Details of intermediate means between the sensing means and the element to be sensed
    • B65H2553/61—Mechanical means, e.g. contact arms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/21—Industrial-size printers, e.g. rotary printing press

Definitions

  • the invention relates to a button for cyclically scanning the stack height of a stack of a paper sheet processing machine, in particular a printing machine.
  • a button is known which is lowered via a four-bar guide gear, which is rigidly connected to a four-bar drive gear, which in turn is controlled by a cam drive, for cyclic scanning of the sheet stack on the stack surface and to release the upper sheet of paper Scanning the stack height for taking over the paper sheet by subordinate suction cups is raised again.
  • a double four-bar drive all inertial forces of both four-bar systems act when the feeler foot is lowered.
  • this sheet of paper becomes part of the drive area because of the high inertial forces of both four-bar drives, but also because of the drive area that extends a little further downwards for the measurement to be sure that the foot touches the top sheet of paper high, further driving forces pressed onto the upper sheet of paper.
  • the upper sheets of paper can be deformed in a wave shape, which jeopardizes safe sheet takeover and conveying of the paper sheets after being picked up by the suction cups, especially at high speeds.
  • the lifted paper sheets are usually taken over by the suction cups from the suction cups and conveyed over the front edge stops of the stack.
  • a wavy design of the paper sheets can on the one hand lead to tripping phenomena of the paper sheet when conveyed, for example, via the leading edge stops, and on the other hand the non-uniform corrugation also facilitates a non-uniform underflow of the sheet, in particular when using air blowers, which means that Flutter phenomena are made possible.
  • a safe height measurement and height readjustment with the undefined indentation of the push button into the stack is hardly possible with such a push button device. With such a push button device, deviations in the measured stack height depend on the inertial forces and the conveying speed.
  • the type of paper also plays a role. An inaccurate height measurement leads to an inaccurate height setting and thus to problems in the safe sheet removal and sheet conveyance. It is also possible that the paper sheets will be damaged completely.
  • a button is known in which a feeler foot is driven by a cam-controlled pivot lever and a four-bar guide gear.
  • a guide rod is attached to the four-bar guide gear, around which a compression spring is wound.
  • the guide rod is movably mounted in the swivel lever.
  • the compression spring is pressed off on the swivel lever. After placing the sensing foot on the stack surface, the high inertial forces of the solid swivel lever no longer fully affect the stack surface.
  • the swivel lever which moves a little further downwards after the touchdown moment, compresses the spring over the entire drive region of the swivel lever that drives further downward, as a result of which the force acting on the stack from the spring via the feeler foot after the touch foot is placed on the stack surface however, continues to increase over the downward drive cycle. Due to the rapidly increasing spring force, the feeler foot is pressed onto the stack surface undesirably strongly, which means that the upper paper sheets can also be pressed in indefinitely. A safe separation and conveyance of the paper sheets, a safe determination of the stack height and a safe stack readjustment is not guaranteed even with such a push button device. Damage to the paper sheets is also possible here.
  • the US 4,786,043 shows a four-bar guide gear, in which the feeler foot is placed on the stack surface from above and is pivoted out of the stack area again after the stack height has been determined, so that the suction cups can grip the paper sheet more quickly, but safe stack processing at very high speeds cannot be achieved for the reasons mentioned.
  • DE-OS 32 18 565 shows a suction lock with a vertically up and down guide member which engages in an elongated hole of a tongue with a pressure plate.
  • the tongue is attached to a frame via a spring.
  • the pressure plate is lifted vertically by lifting the guide member. When lowering, it is lowered vertically due to the spring force until the pressure plate touches the stack surface and presses it under spring force. With further lowering of the guide member, no increasing force is exerted by the pressure plate on the sheet stack, but the purely vertical movement of the drive plate makes fast, safe processing of the stack by suction almost impossible.
  • the pressure plate To securely take over a sheet, the pressure plate must first be in a position above the height to which the suction cups lift the sheet.
  • the pressure plate can be lowered again for height measurement.
  • This sequential sequence of the individual processes takes up an undesirable amount of time. This is detrimental to a high speed requirement.
  • the pressure plate which is always located above the upper arch due to the vertical movement, cannot hold the arch located under the raised arch after the arch has been lifted, so that when the upper arch is transported away when the upper arch sags due to frictional effects or flow effects, part of it Position can be torn out with. Both the height sensing as well as the sheet pick-up and sheet feeding are at risk. Even with such a button, safe batch processing at high speeds is not possible.
  • the invention is therefore based on the object of designing a pushbutton for cyclically scanning the stack height of a lay-up stack of a paper sheet processing machine, in particular a printing press, in such a way that reliable denesting is possible even at high speeds.
  • the object is achieved by the design of a push button according to the features of claim 1.
  • the lever drive gear enables the pushbutton to be driven safely.
  • the four-bar guide gear with the levers arranged one above the other and the feeler foot attached to the coupling enables the feeler foot to be pivoted in and out on a curved path, so that the feeler foot can be placed essentially vertically on the stack surface and is safe for faster sheet removal from the stacking area can be swung out.
  • the subsequent sheet can be picked up more quickly by subordinate conveying means, for example by suction lifters be reduced, whereby the duration of a funding cycle can be reduced.
  • the vertical placement of the feeler foot enables a safe placement of the feeler foot for the paper sheets underneath, which is particularly advantageous at high speeds.
  • the coupling between the drive gear and the four-bar guide gear by means of a driving stop and a stop surface for lifting the feeler foot enables safe and quick lifting of the feeler foot in accordance with the drive control. At the moment the touch foot is put on, only the masses of the touch foot and guide gear and the spring force act.
  • the decoupling of the drive gear and the guide gear enables a simple, light design of the guide gear, so that the force exerted by the guide gear and the feeler foot can be minimized when the feeler foot is put on.
  • the spring which is fixed to the machine, presses the probe foot onto the stack surface when it is placed down with a defined spring force.
  • This spring force can be selected by dimensioning the spring so that it is just so strong at the moment of placement that a safe arc height measurement is still possible.
  • the embodiment according to the features of claim 2 is particularly advantageous.
  • the stop surface can be designed to be particularly small and simple, since the entrainment stop assumes the same position with respect to the stop surface in every position of the contact with the stop surface. Inaccuracies due to manufacturing and movement tolerances between the stop surface and the driving stop, which have a negative effect on the pushbutton movement, can thus be reduced.
  • a particularly simple and safe drive is made possible by the configuration according to the features of claim 4.
  • the number of articulation points can be minimized while maintaining the advantages of the four-articulated drives for guidance, drive and mass distribution.
  • the feeler foot is attached to the extension of the coupling so that it can be adjusted in height. This enables simple, exact adjustment and readjustment of the feeler foot. The safe final stacking can thus be ensured in a simple manner.
  • Fig. 1 shows a feeder of a sheet-fed offset printing machine, in which in a known manner the top sheet of a stack 1 is lifted by a suction device 5 of a suction head 2 and forward drag suction devices 6 of the suction head 2 from the suction head area forward to conveying means, not shown, in the area of the feed table to be led.
  • the paper sheet is transferred via the feed table 3 to gripper bars of the pre-gripper drum 4, which transfer it to a printing cylinder, not shown, in a known manner.
  • a feeler foot 8 is swung in under the raised sheet of paper into the area above the lay-up stack 1 and lowered onto the lay-up stack 1 until the feeler foot comes into contact with the upper sheet of the lay-up stack 1.
  • the feeler foot 8 is fastened in a vertical downward extension of a coupling 11.
  • the coupling 11 is articulated with an upper joint 12 to a lever 14 and with a lower joint 13 a lever 16 hinged.
  • the lever 14 is pivotally mounted with its other lever end in a machine-fixed pivot bearing 15.
  • the feeler foot 8 is lowered essentially parallel to the lever 14, the lever 16 is aligned and pivotably articulated in a machine-mounted pivot bearing 17.
  • Concentric to the pivot axis of the lever 16 about the pivot bearing 17, a lever 18 is pivotally articulated in the pivot bearing 17.
  • the lever 18 is articulated at its other lever end with a joint 19 to a coupling 20, which in turn is articulated in a joint 21 to a lever 22.
  • the lever 22 is pivotally mounted in a machine-mounted pivot bearing 23.
  • a scanning roller 24 is rotatably mounted on the lever 22 between the joint 21 and the pivot bearing 23.
  • a tension spring 27 engages on the lever 22 and is mounted on the machine with its other spring bearing. The spring 27 holds the scanning roller 24 in permanent contact with the outer contour of the radial curve 25.
  • the radial curve 25 is fastened on a control shaft 26 which extends transversely to the sheet conveying direction and which is rotatably mounted in the suction head frame in a known manner, not shown.
  • the control shaft 26 is connected in a known manner to the machine drive.
  • a stop screw 30 is screwed into the lever arm 29 of the lever 18 below the lever 16.
  • the stop screw 30 is designed with its upper surface facing the lever 16 as a stop surface. Opposite the lever 16 is formed with a corresponding stop surface 31.
  • a spiral bending spring 28 is wound around the pivot bearing 15, which is supported with its one spring bearing on a machine-fixed stop 40 and with its other spring bearing on the lever 14. The spiral spring 28 presses the lever arm 14 downwards.
  • the lever 14, the coupling 11 and the lever 16 are moved downward by pivoting the lever 14 about the pivot bearing 15 and the lever 16 about the pivot bearing 17, the stop surface 31 of the lever 16 being in constant contact with one another to the stop screw 30.
  • the front edge 42 of the feeler foot 8 describes a curve 41, ie it is first pivoted almost horizontally from an area outside the stacking stack into the region of the stacking stack under the paper sheets (not shown) that have already been removed, in order to then pass into a substantially vertical movement range. by lowering the foot on the stack surface. This downward movement continues until the sensing foot, as shown in FIG. 3b, rests on the surface of the stack 1.
  • the sensor 34 is connected via an electrical connection 35 to a measuring and evaluation device, for example a computer. From the distance between sensor 34 and measuring surface 33, the computer determines the current height of the stack in a known manner.
  • the sheet of paper, not shown, previously raised by the lifting suction device 5, is transferred from the suction devices 6 to conveying means, not shown, of the feed table.
  • the spring 28 is dimensioned so that the feeler just rests on the stack with such a force that a height measurement is still possible.
  • the feeler foot prevents the currently uppermost sheet 10 of the stack 1, on which the feeler foot rests, from being carried away by the paper sheet which has already been lifted off and is carried away by the suction devices.
  • a blowing nozzle 36 is attached to the sensing foot 8 and is connected to blowing air in a cyclically controlled manner via a blowing air supply line 9. This will blow off the sheet that is lifted. This makes it easier to prevent contact with the stack.
  • the contact screw 30 is no longer lowered.
  • the distance between the contour of the curve 25 and the control shaft 26 increases again, so that the scanning roller 24 and thus the lever 22 are pivoted away from the control shaft 26 again.
  • the lever 18 is pivoted about the pivot shaft 17 so that the stop screw 30 moves upward.
  • the stop screw 30 takes over its stop surface and over the stop surface 31 of the lever 16, the lever 16 with pivoting about the pivot axis 17 upwards.
  • the feeler foot 8 lifts essentially vertically from the stack surface and is pivoted back out of the area above the stack into a position in an area outside the stack. Such a position is shown for example in Fig. 3a.
  • the suction cups 5 are cyclically lowered again in a known manner to receive the next sheet of paper from the stack. Lifting suction device 5 and drag suction device 6 are supplied with suction air in a known manner via the suction head with the aid of a suction air supply line 7.
  • a spiral spring can also be wound around the pivot axis 15.
  • One spring arm is supported against a pin 38 fastened in the suction head housing, the other spring arm is supported against a pin 39 fastened in the lever arm 14.
  • the height of the feeler foot can be adjusted exactly.
  • the stack height determined by the computer is used in a known manner for cyclical adjustment of the stack height.
  • the computer can cyclically generate a control signal corresponding to the measured value for the drive means of the Lift drive take place.
  • the separation of the drive gear from the guide gear enables a simple, lightweight construction of the guide gear and the feeler foot.
  • the parts can be made largely of plastic and / or aluminum.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Switches With Compound Operations (AREA)
  • Push-Button Switches (AREA)

Claims (8)

  1. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer,
    - comprenant un mécanisme de commande à leviers (22, 20, 18) comportant un galet palpeur (24) qui est en contact permanent, au moins pendant la course du papier, au moyen d'un ressort (27), avec une came de commande (25) commandée cycliquement,
    - comprenant un mécanisme de guidage à quatre articulations qui comporte deux leviers superposés (14, 16) dont chacun est monté par articulation par une extrémité sur le châssis et dont chacun est monté par articulation par l'autre extrémité à distance l'un de l'autre sur une bielle (11), un pied palpeur (8) d'exploration de la hauteur de la pile étant montée sur un prolongement vertical, orienté vers le bas, de la bielle (11),
    - comprenant une butée d'entraînement (30) qui est fixée au mécanisme de commande (22, 20, 18),
    - comprenant une surface de butée (31) placée sur le mécanisme de guidage, conformée et disposée de manière à correspondre à la butée d'entraînement (30) pour l'établissement cyclique d'un contact pour le soulèvement du pied palpeur (8) et
    - comprenant un ressort (28) dont un patin articulé est solidarisé avec la machine et dont l'autre patin articulé est monté sur le mécanisme de guidage et dont la force d'élasticité pousse la surface de butée (31) vers la butée d'entraînement (30).
  2. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités de la revendication 1,
    - la butée d'entraînement (30) étant montée oscillante autour d'un point d'oscillation (17), qui est en position fixe par rapport à la machine, de l'un (16) des deux leviers (14, 16) du mécanisme de guidage.
  3. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités de la revendication 2,
    - le patin articulé du ressort (28), qui est fixé au mécanisme de guidage, étant disposé sur l'autre (14) des deux leviers (14, 16) du mécanisme de guidage.
  4. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités de la revendication 1,
    - le mécanisme de commande à leviers étant un mécanisme de commande à quatre articulations,
    - dans lequel chacun de deux leviers (22, 18) est monté par une extrémité d'un bras de levier autour d'un point de pivotement (23, 17) solidaire de la machine et
    - dans lequel ces deux leviers (22, 18) sont articulés par l'autre extrémité à distance l'un de l'autre sur une bielle commune (20),
    - dans lequel le point de pivotement (17), solidaire de la machine, d'un premier (18) des deux leviers (22, 18) est le point d'oscillation (17), solidaire de la machine, d'un premier (16) des deux leviers (14, 16) du mécanisme de guidage, la butée d'entraînement (30) étant disposée sur ce premier levier (18) du mécanisme de commande et la surface de butée correspondante (31) étant disposée sur ce premier levier (16) du mécanisme de guidage.
  5. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités de la revendication 4,
    - le galet palpeur (24) étant monté rotatif sur le deuxième (22) des deux leviers (22, 18) du mécanisme de commande à quatre articulations.
  6. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités de la revendication 1,
    - une surface d'exploration (33), dont la position varie en fonction de la position en hauteur du pied palpeur, étant réalisée sur le mécanisme de guidage,
    - et comprenant un dispositif détecteur (34), solidaire de la machine, destiné à la détermination de la position de cette surface d'exploration (33), et qui est en liaison avec un dispositif de dépouillement et de commande pour le réajustement de la hauteur de la pile.
  7. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités des revendications 6 et 2,
    - la surface d'exploration (33) étant réalisée sur l'un (16) des deux leviers (16, 14) du mécanisme de guidage.
  8. Palpeur d'exploration cyclique de la hauteur d'une pile se trouvant sur une table de marge d'une machine de traitement de feuilles de papier, en particulier d'une machine à imprimer, selon les particularités de la revendication 1,
    - le pied palpeur (8) étant monté réglable en hauteur sur le prolongement de la bielle (11).
EP94104376A 1993-04-14 1994-03-19 Détecteur pour détecter périodiquement la hauteur d'empilage Expired - Lifetime EP0620173B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4312228A DE4312228A1 (de) 1993-04-14 1993-04-14 Taster zum zyklischen Abtasten der Stapelhöhe
DE4312228 1993-04-14

Publications (2)

Publication Number Publication Date
EP0620173A1 EP0620173A1 (fr) 1994-10-19
EP0620173B1 true EP0620173B1 (fr) 1997-09-03

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ID=6485481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94104376A Expired - Lifetime EP0620173B1 (fr) 1993-04-14 1994-03-19 Détecteur pour détecter périodiquement la hauteur d'empilage

Country Status (5)

Country Link
US (1) US5398924A (fr)
EP (1) EP0620173B1 (fr)
JP (1) JP2587583B2 (fr)
AT (1) ATE157625T1 (fr)
DE (2) DE4312228A1 (fr)

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US5938189A (en) * 1996-09-16 1999-08-17 Siemens Nixdorf Informationssysteme Aktiengesellschaft Sheet-extracting device with a cassette for receiving a stack of sheets
DE19755521A1 (de) * 1997-12-13 1999-06-17 Koenig & Bauer Ag Bogentrenner
DE19755520A1 (de) * 1997-12-13 1999-06-17 Koenig & Bauer Ag Bogentrenner
US6247695B1 (en) * 1998-12-23 2001-06-19 Xerox Corporation Multiple zone stack height sensor for high capacity feeder
JP4104399B2 (ja) * 2002-08-28 2008-06-18 シャープ株式会社 給紙装置
US7198265B2 (en) * 2004-08-31 2007-04-03 Lexmark International, Inc. Imaging apparatus including a movable media sensor
JP2006347701A (ja) 2005-06-16 2006-12-28 Komori Corp シート状物押え装置
DE102005042860B4 (de) * 2005-09-08 2009-01-08 Eastman Kodak Co. Vorrichtung zur Ermittlung eines Niveaus einer Oberfläche eines Bogenstapels
JP5952865B2 (ja) 2014-07-03 2016-07-13 本田技研工業株式会社 オイルレベルゲージ組み付け構造
DE102021115423A1 (de) 2021-06-15 2022-12-15 Koenig & Bauer Ag Anleger einer Bogenbearbeitungsmaschine und Verfahren zum Bogentrennen

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DD206487A3 (de) * 1981-10-29 1984-01-25 Polygraph Leipzig Kurven- und pneumatisch gesteuerter tasterblaeser
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CS253506B1 (en) * 1985-10-10 1987-11-12 Jaroslav Jiruse Loading equipment
JPH0738286Y2 (ja) * 1989-09-12 1995-08-30 ホリゾン・インターナショナル株式会社 丁合機用給紙装置
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DE4012779C1 (fr) * 1990-04-21 1991-05-02 Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De

Also Published As

Publication number Publication date
DE59403917D1 (de) 1997-10-09
ATE157625T1 (de) 1997-09-15
DE4312228A1 (de) 1994-10-27
US5398924A (en) 1995-03-21
EP0620173A1 (fr) 1994-10-19
JP2587583B2 (ja) 1997-03-05
JPH06305600A (ja) 1994-11-01

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