EP0564288A2 - Verpackungsmachine mit thermischem Drucker - Google Patents

Verpackungsmachine mit thermischem Drucker Download PDF

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Publication number
EP0564288A2
EP0564288A2 EP93302583A EP93302583A EP0564288A2 EP 0564288 A2 EP0564288 A2 EP 0564288A2 EP 93302583 A EP93302583 A EP 93302583A EP 93302583 A EP93302583 A EP 93302583A EP 0564288 A2 EP0564288 A2 EP 0564288A2
Authority
EP
European Patent Office
Prior art keywords
imprinter
web
print head
path
machine
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
EP93302583A
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English (en)
French (fr)
Other versions
EP0564288B1 (de
EP0564288A3 (en
Inventor
Rick S. Wehrmann
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.)
Automated Packaging Systems Inc
Original Assignee
Automated Packaging Systems Inc
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 Automated Packaging Systems Inc filed Critical Automated Packaging Systems Inc
Publication of EP0564288A2 publication Critical patent/EP0564288A2/de
Publication of EP0564288A3 publication Critical patent/EP0564288A3/en
Application granted granted Critical
Publication of EP0564288B1 publication Critical patent/EP0564288B1/de
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
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/02—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for perforating, scoring, slitting, or applying code or date marks on material prior to packaging
    • B65B61/025—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for perforating, scoring, slitting, or applying code or date marks on material prior to packaging for applying, e.g. printing, code or date marks on material prior to packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • B41J15/06—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles characterised by being applied to printers having stationary carriages

Definitions

  • This invention relates generally to a packaging machine equipped with a printing apparatus and, more particularly, to the control of the feed of a web to be imprinted by a thermal imprinter as it is fed along a path of travel.
  • Thermal imprinters are frequently utilized for such printing. Thermal imprinters operate by bringing the item to be printed into contact with a transfer material, such as foil, and applying heat with a print head at points of contact.
  • thermal imprinters Problems associated with thermal imprinters include maintaining proper tension of the item being printed and maintaining the proper print area on each item. Additionally, movement of the foil between a supply reel and a take-up reel causes a static build-up due to the contact with the items. This problem is especially bad on cool and dry days and effects the electronics of the imprinter.
  • a proposed imprinter would have a paper sheet that is transported by a platen roller in conjunction with first and second pinch rollers.
  • the pinch rollers would be positioned in parallel with a shaft of the platen roller on each side of the platen roller.
  • the pinch rollers would be rotatably attached to respective pairs of substantially U-shaped arms that would be respectively mounted on each of two walls of a bracket.
  • the arms would respectively be connected to the walls by springs so that the pinch rollers would urge the paper into contact with the surface of the platen roller.
  • a pulse motor would selectively rotate its shaft in both clockwise and counterclockwise directions in accordance with supplied control signals.
  • the platen roller would thereby cause the paper sheet to move in either a forward or backward direction.
  • the pulse motor would receive signals which would cause the motor to drive the paper in either a forward or reverse direction as needed for printing.
  • Another proposed imprinter would utilize a microprocessor to compare the output of a paper take-up encoder with a stepper drive pulse count over a corresponding interval of time.
  • the microprocessor would compare the output of the encoder and the drive pulse count to determine an indication of the current operating radius of paper wound upon a paper take-up reel. This comparison would be stored in a RAM.
  • the microprocessor would then access a second function table stored in a ROM to determine the adjustment necessary in a take-up drive and thereby adjust the output torque of a take-up motor.
  • the present invention provides a thermal transfer printing apparatus for use with another type of machine, in this case a packaging machine, for printing a continuous web such as a chain of bags.
  • the apparatus comprises a frame structure having an imprinter mounted thereon.
  • the imprinter includes a print head, as well as a transfer material supply reel and a transfer material take-up reel for providing transfer material, typically in the form of foil.
  • a plurality of idlers supports the web and defines a path of travel for the web of items. A segment of the path of travel is adjacent the imprinter and its print head.
  • a rockable arm is connected to the frame structure.
  • the arm carries rollers that contact the web along a top surface of the web at spaced locations, one upstream of the print head and the other downstream of the print head
  • the arm is connected to the frame structure for rotation about a pivot axis and rocks about this pivot axis during a printing process in a manner similar to a "teeter-totter.”
  • Two drive rollers are located along the path of travel and control the advance of the web during the printing process.
  • the drive rollers are controlled by a stepper motor that operates the drive rollers intermittently to control web feed within the segment of the path of travel adjacent to the imprinter.
  • the stepper motor preferably advances the drive rollers at least one step for each line printed by the print head during the printing process.
  • a nip is connected to the imprinter near an end opposite the print head and cooperates with one of the drive rollers to engage the web during the printing process thereby clamping the web between the nip and drive roller.
  • the print head is positioned to engage the foil adjacent the second drive roller during the printing process thereby clamping the foil and web between the print head and the second drive roller. Movement of the nip and the print head are controlled by air cylinders.
  • a sensor is provided for sensing indicia on the web.
  • the sensor controls the initiation operation of the imprinter in response to sensing such indicia.
  • the air cylinders clamp the web between the print head and nip and their respectively associated drive rollers to maintain proper feed control of the selected portion as the printing process proceeds.
  • the stepper motor drives the drive rollers and the rockable arm pivots about its pivot axis thereby controlling the intermittent advance of the web.
  • the transfer supply reel and the transfer take-up reel are isolated from the rest of the imprinter by a ground plane shield that separates the reels from the rest of the imprinter. This minimizes the subjection of the imprinter control electronics to static electricity generated during the printing process.
  • a further feature of the printing apparatus is the mounting of the imprinter on the frame structure.
  • the imprinter is pivotally mounted near its downstream end to a shaft and is removably secured near its upstream end to another shaft. This allows the imprinter to be tilted forward about a pivot axis for easy access to the print head, which requires service from time to time for cleaning and repair.
  • Another feature of the present invention is the ability to mount two or more imprinters side by side on the same machine frame structure. This allows two or more webs to be fed through the machine simultaneously and be imprinted. Additionally, wide webs can be fed through the machine and can be imprinted at adjacent locations simultaneously by the multiple imprinters.
  • An adjustment arm is located along the path of travel downstream from the imprinter and is used to adjust the length of the path of travel section between the imprinter and, with the disclosed apparatus, a packaging station.
  • the adjustment arm is adjusted according to the length of the items within the web and helps maintain proper coincident registration of a web portion to be imprinted and an item at a packaging or other downstream work station.
  • a packaging machine that handles continuous webs of interconnected plastic, pre-opened bags for loading the bags with product is illustrated generally at 10.
  • the machine 10 includes a packaging station 10a, a frame structure 11 and an imprinter 12 mounted on the frame structure 11.
  • the machine also includes a supply reel 13 for supplying a web of items W.
  • the machine 10 is a packaging machine as described and claimed in U.S. Patent No. 3,965, 653 entitled PACKAGING APPARATUS, and in other patents deriving from the applications that resulted in this patent, and has been sold commercially by Automated Packaging Systems, Inc.
  • a machine described and claimed in U.S. patent 4,899,520 entitled PACKAGING APPARATUS AND METHOD functions in a manner similar to the machine described in U.S. Patent No. 3,965,653 but has additional capabilities including the ability concurrently to utilize two chains of interconnected bags for "double up" packaging.
  • the web W of bags that is preferably used with packaging machines of this type is disclosed and claimed in U.S. patent 3,254,828 entitled FLEXIBLE CONTAINER STRIPS. All three patents are incorporated herein by reference.
  • the imprinter 12 includes a transfer material supply reel 14 and a transfer material take-up reel 15. Transfer material T is fed between the transfer material supply reel 14 and the transfer material take-up reel 15 and is supported along a path between the two reels 14, 15. The path is defined in part by rolls 16, 17, 18.
  • the transfer material is preferably any commercially available foil that is commonly used with thermal imprinters.
  • a prototype machine 10 utilized foil supplied by International Imaging Materials Inc. (IIMAC), 310 Commerce Drive, Amherst, NY 14228-2396, having part number FAP106PZ.
  • the transfer material take-up reel 15 and roll 16 are both driven.
  • the take-up reel 15 is drivingly connected to a gear 20 by a belt 21.
  • the belt 21 projects laterally from the gear 20 and take-up reel 15, and is at one end of the take-up reel 15 and gear 20.
  • the gear 20 is in mesh with a drive gear 22 that is driven by a stepper motor (not shown).
  • the driven roll 16 is drivingly connected to the drive gear 22 by a belt 23.
  • the belt 23 projects laterally from the gear 22 and driven roll 16, and is at one end of thee driven roll 16 and gear 22. Both belts 21, 23 are in a space approximately 3/16 of an inch (about 4.75mm) wide.
  • the imprinter includes a print head 25 pivotally mounted at 27.
  • a nip 24 is pivotally connected to the imprinter 12 at 26.
  • Two air cylinders 30, 31 are located on the imprinter 12 above the nip 24 and print head 25, respectively.
  • a "doctor" blade 32 is located at a downstream end 33 of the imprinter 12 for separating the transfer material from the web after the printing process is complete. The transfer material travels around the blade 32 at a sharp angle.
  • the imprinter 12 is pivotally mounted near its downstream end 33 to shaft 34.
  • the imprinter 12 is releasably secured near its upstream end 33a to shaft 35 by a latch or clamp mechanism 36.
  • the latch mechanism 36 holds the imprinter 12 in place and prevents lateral movement of the imprinter along shaft 34.
  • release of the latch mechanism 36 disconnects the imprinter 12 from shaft 35, thereby allowing the imprinter to be tilted about shaft 34 for such things as access to print head 24, which requires service from time to time for cleaning and repair.
  • the only requirement for tilting of the imprinter 12 other than release of the latch 36 is that the blade 32 be tilted forward.
  • the imprinter also includes a control panel 12a and a display 12b.
  • multiple imprinters 12 can be mounted on the machine 10. This allows wide webs to be imprinted at adjacent locations simultaneously by the multiple imprinters. Additionally, multiple webs can be processed through the machine 10 simultaneously with both webs being imprinted. Multiple imprinters can be mounted side by side because of the tall, narrow silhouette of each imprinter.
  • the transfer material is slightly wider than the print head 24 and the imprinter 12 is slightly wider than the transfer material. In the preferred embodiment, 3/16of an inch (about 4.75mm) is provided between each outer edge 37,38 of the imprinter 12 and the transfer material. This allows the imprinters to be mounted in a juxtaposed relationship by matching and printing can be accomplished with only,a separation of 3/8 of an inch (about 9.5mm) between areas being printed.
  • the web W moves along a path of travel that is defined in part by a plurality of idlers 39, 40, 41, 42, 43, 44.
  • the idlers guide and support the web as it moves from the supply reel 13 and under the imprinter during operation of the machine 10.
  • Idler 39 is connected to the free structure 11 by a dancer arm 39a. The idler 39 and dancer arm 39a help maintain proper tension within the web during advancement of the web through the machine 10.
  • Drive rollers 45, 46 are connected by bells 47, 48 to a stepper motor 49 to control the advance of a web section S adjacent the imprinter during operation of the imprinter.
  • the drive rollers control the advance of the web such that a web portion to be printed is properly advanced at an appropriate rate as the printing by the print bead 25 proceeds.
  • a rockable arm (or “teeter-totter” or “seesaw”) 50 has spaced idlers 51,52 journaled near its ends. The idlers 57,52 engage the web along a top surface of the web.
  • the teeter-totter 50 is mounted on a shaft 53.
  • An air cylinder 55 is connected to the teeter-totter and is utilized to cause the teeter-totter to rock back and forth about a pivot 54.
  • the teeter-totter idlers 51, 52 respectively control the sizes of upstream and downstream web accumulator loops 56, 57.
  • the upstream web accumulator loop 56 is of maximum size.
  • the upstream accumulator loop 56 has been reduced a given amount as the web section S is transferred past the imprinter 12 concurrently the downstream accumulator loop 57 has been increased by an amount equal to the size reduction of the upstream loop.
  • An adjustment arm 60 is connected to the shaft 53.
  • the adjustment arm 60 has a length control idler 61 located near an upper end of the adjustment arm.
  • the web is fed under the idler 61 and above an upper portion 62 of the adjustment arm 60.
  • the adjustment arm has an adjustment slop 63 which projects through and engages an adjustment slot 64 defined within support bracket 64a.
  • the idler 61 raises or lowers the web downstream from the imprinter 12.
  • the adjustment arm 60 is adjusted by manually loosening the stop 63 and moving the stop within the slot 64 and then retightening the slop.
  • This adjustment is utilized to adjust the path length between the imprinter 12 and the station 10a.
  • This path length adjustment enables concurrent registration of a bag at the packaging station 10a and the web section S to be imprinted. This path adjustment is necessary because the length of the individual bags within the web W for one packaging operation is often different than the bag length for another.
  • ground plane shields 66, 67 are therefore provided.
  • the ground plane shields 66, 67 isolate the supply reel and take-up reels 14, 15 from the rest of the imprinter 12.
  • Another ground plane shield 68 is located between the segment of the path of travel adjacent the imprinter and the imprinter itself. The ground plane shields protect the imprinter electronics from static electricity.
  • the packaging station 10a has feed rolls 70, 71 and a load station shown generally at 73.
  • the feed rolls 70, 71 advance the web through the entire machine 10.
  • the packaging station 10a also includes a sealing section 76 that seals loaded bags by clamping the bags between a seal bar 77 and a heater bar 78.
  • the web of items W is advanced along the path of travel defined by the idlers 39, 40, 41, 42, 43, 44, the drive rollers 45, 46 and the teeter-totter idlers 51, 52, the length control idler 61 and the feed rolls 70, 71, and into the load station 73.
  • the feed rolls 70, 71 of the packaging station 10a draw the web through the machine 10 along the path of travel.
  • control means including a detector preferably in the form of a spark gap detector (shown schematically at 75) within the packaging station 10a communicate with the electronics of the imprinter 12 and cause the air cylinders 30, 31 to move the nip 24 and print head 25 respectively as illustrated in Figure 2B (approximately 1/4 of an inch) thereby isolating a selected bag (web section S) to be printed.
  • the print head 25 clamps the transfer material T and web W against the drive roller 46 while the nip 24 clamps the web against the drive roller 45.
  • the stepper motor 47 then drives the drive rollers 45, 46 as the air cylinder 55 causes the teeter-totter to pivot about pivot 54 as illustrated in Figure 2B thereby advancing the web section S under the imprinter.
  • This causes the selected bag to advance relative to the imprinter 12 and thereby the bag is advanced past the print head 25.
  • the print head 25 prints on the selected bag by heating the transfer material.
  • the drive gear 22 drives the transfer material take-up reel 15 thereby advancing the transfer material T past the print head.
  • the sharp angle at which the transfer material passes the blade causes the transfer material T to separate from the web W. The manner of separation improves the print quality.
  • control means communicate with the imprinter to disengage the air cylinders 30, 31 from the print head 25 and nip 24. This "releases" the web so that the feed rolls 70, 71 can freely advance the web.
  • control means will coordinate operation of the imprinters so that each web is properly imprinted as it advances through the machine.
  • the imprinters may be in "communication" with one another to control proper imprinting for each web.
  • a prototype imprinter 12 has suitable electronics for operating the imprinter that have been developed and produced by MicroCom, 8333 Green Meadows Dr. North, Westerville, Ohio 43081. This is provided by electronics having part numbers 050012, 050013, 630002, 630003, 570017, 060013, 060014, 060015, 060016, 060017, 060018, 050005 and 040011.
  • An optional sensor 85 can be added to improve the precision of the location of a web portion on which the imprinter will print.
  • the web is positioned just prior to printing such that the indicia on a bag to be printed is rearward of the sensor 85 a distance large enough such that, within a range of tolerance, location of the indicia is always upstream from the sensor 85. Therefore, the indicia are separated a distance equal to a multiple of the bag length.
  • the sensor 85 causes the imprinter 12 to begin once the sensor has seen the indicia thus helping assure correct registration of the imprinting on the selected bag. This allows a more precise placement of the printing on the bag.
  • the embodiments described above provide a packaging machine including an improved thermal imprinter having a novel system for advancement and control of a continuous web of items to be imprinted.
  • the improved thermal imprinter apparatus has an easy-to-access thermal print head, and the imprinter has protection against static electricity that develops during operation of the imprinter.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Impression-Transfer Materials And Handling Thereof (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Electronic Switches (AREA)
EP19930302583 1992-04-01 1993-04-01 Verpackungsmachine mit thermischem Drucker Expired - Lifetime EP0564288B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86158792A 1992-04-01 1992-04-01
US861587 1992-04-01

Publications (3)

Publication Number Publication Date
EP0564288A2 true EP0564288A2 (de) 1993-10-06
EP0564288A3 EP0564288A3 (en) 1993-12-29
EP0564288B1 EP0564288B1 (de) 1996-11-13

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ID=25336206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930302583 Expired - Lifetime EP0564288B1 (de) 1992-04-01 1993-04-01 Verpackungsmachine mit thermischem Drucker

Country Status (5)

Country Link
EP (1) EP0564288B1 (de)
CA (1) CA2092377C (de)
DE (1) DE69305898T2 (de)
ES (1) ES2096204T3 (de)
MX (1) MX9301856A (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0802117A1 (de) * 1996-04-19 1997-10-22 Daisey Kikai Co., Ltd. Thermischer Linien-Druckkopf
EP0850840A1 (de) * 1996-12-23 1998-07-01 ISHIDA CO., Ltd. Verfahren und Vorrichtung zum Bedrucken einer Verpackungsbahn in einer Schlauchbeutelmaschine
EP0903232A2 (de) * 1997-09-18 1999-03-24 Paxar Corporation Tintenstrahldrucker und Verfahren zum beidseitigen Bedrucken von Etikettenbahnen
WO2004011332A3 (en) * 2002-07-31 2004-07-08 Sharp Packaging Systems Inc Continuous strip bag feeder and loader with pivotable integrated printer assembly
EP1829695A1 (de) * 2006-03-02 2007-09-05 Daisey Machinery Co., Ltd. Druckverfahren und -vorrichtung
ITBO20100135A1 (it) * 2010-03-09 2011-09-10 Gd Spa Metodo e apparecchiatura per la stampa di materiale in nastro
CN112896670A (zh) * 2021-02-04 2021-06-04 平顶山学院 一种包装压平压印一体装置
US11866212B2 (en) 2014-06-18 2024-01-09 Pregis Sharp Systems, Llc Bagging machine and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102673A (en) * 1958-06-09 1963-09-03 Commercial Envelope Mfg Co Inc Strip feeding means
US4071178A (en) * 1976-06-07 1978-01-31 Copp Robert M Machine for use with moving webs
FR2570564A1 (fr) * 1984-09-17 1986-03-21 Thomson Csf Mat Tel Agencement d'alimentation en bande imprimante pour telecopieur
EP0251448A2 (de) * 1986-05-01 1988-01-07 Synpro Machine Initiative Limited Bahndruckmaschine für veränderliche Formate
EP0311981A2 (de) * 1987-10-14 1989-04-19 Tokyo Electric Co., Ltd. Nach dem Übertragungsprinzip arbeitender Thermodrucker
US4899520A (en) * 1988-03-29 1990-02-13 Automated Packaging Systems, Inc. Packaging apparatus and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102673A (en) * 1958-06-09 1963-09-03 Commercial Envelope Mfg Co Inc Strip feeding means
US4071178A (en) * 1976-06-07 1978-01-31 Copp Robert M Machine for use with moving webs
FR2570564A1 (fr) * 1984-09-17 1986-03-21 Thomson Csf Mat Tel Agencement d'alimentation en bande imprimante pour telecopieur
EP0251448A2 (de) * 1986-05-01 1988-01-07 Synpro Machine Initiative Limited Bahndruckmaschine für veränderliche Formate
EP0311981A2 (de) * 1987-10-14 1989-04-19 Tokyo Electric Co., Ltd. Nach dem Übertragungsprinzip arbeitender Thermodrucker
US4899520A (en) * 1988-03-29 1990-02-13 Automated Packaging Systems, Inc. Packaging apparatus and method

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0802117A1 (de) * 1996-04-19 1997-10-22 Daisey Kikai Co., Ltd. Thermischer Linien-Druckkopf
US6041574A (en) * 1996-12-23 2000-03-28 Ishida Co., Ltd. Method of printing film at form-fill-seal packaging machine and form-fill-seal packaging machine using the method
EP0850840A1 (de) * 1996-12-23 1998-07-01 ISHIDA CO., Ltd. Verfahren und Vorrichtung zum Bedrucken einer Verpackungsbahn in einer Schlauchbeutelmaschine
US6336718B1 (en) 1997-09-18 2002-01-08 Paxar Corporation Ink jet printer and method
EP0903232A3 (de) * 1997-09-18 1999-12-29 Paxar Corporation Tintenstrahldrucker und Verfahren zum beidseitigen Bedrucken von Etikettenbahnen
US6142622A (en) * 1997-09-18 2000-11-07 Paxar Corporation Ink jet printer and method
EP0903232A2 (de) * 1997-09-18 1999-03-24 Paxar Corporation Tintenstrahldrucker und Verfahren zum beidseitigen Bedrucken von Etikettenbahnen
WO2004011332A3 (en) * 2002-07-31 2004-07-08 Sharp Packaging Systems Inc Continuous strip bag feeder and loader with pivotable integrated printer assembly
US6789963B2 (en) 2002-07-31 2004-09-14 Sharp Packaging Systems, Inc. Continuous strip bag feeder and loader with pivotable integrated printer assembly
EP1829695A1 (de) * 2006-03-02 2007-09-05 Daisey Machinery Co., Ltd. Druckverfahren und -vorrichtung
ITBO20100135A1 (it) * 2010-03-09 2011-09-10 Gd Spa Metodo e apparecchiatura per la stampa di materiale in nastro
US11866212B2 (en) 2014-06-18 2024-01-09 Pregis Sharp Systems, Llc Bagging machine and method
CN112896670A (zh) * 2021-02-04 2021-06-04 平顶山学院 一种包装压平压印一体装置

Also Published As

Publication number Publication date
ES2096204T3 (es) 1997-03-01
DE69305898D1 (de) 1996-12-19
CA2092377C (en) 2000-08-01
EP0564288B1 (de) 1996-11-13
DE69305898T2 (de) 1997-03-06
EP0564288A3 (en) 1993-12-29
CA2092377A1 (en) 1993-10-02
MX9301856A (es) 1994-02-28

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