EP0531675B1 - Verfahren und Vorrichtung zum Verstellen von Farbzonenschrauben in jeweilige Positionen - Google Patents

Verfahren und Vorrichtung zum Verstellen von Farbzonenschrauben in jeweilige Positionen Download PDF

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Publication number
EP0531675B1
EP0531675B1 EP92112389A EP92112389A EP0531675B1 EP 0531675 B1 EP0531675 B1 EP 0531675B1 EP 92112389 A EP92112389 A EP 92112389A EP 92112389 A EP92112389 A EP 92112389A EP 0531675 B1 EP0531675 B1 EP 0531675B1
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EP
European Patent Office
Prior art keywords
ink
ink fountain
zone
assigned
zone screw
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
EP92112389A
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German (de)
English (en)
French (fr)
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EP0531675A1 (de
Inventor
Michael R. Rancourt
Eduardo M. Barreda
Stephen P. Fraczek
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
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Publication date
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Publication of EP0531675A1 publication Critical patent/EP0531675A1/de
Application granted granted Critical
Publication of EP0531675B1 publication Critical patent/EP0531675B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys

Definitions

  • the present invention relates to the adjustment of ink fountain keys in an ink fountain of a printing unit in respective positions.
  • each ink fountain key is moved with an associated servomotor.
  • Each ink fountain key is assigned to part of an ink knife.
  • the parts of the ink knife are assigned to parts of an ink fountain roller and can be positioned so that a gap is formed between the ink fountain roller and the ink knife.
  • the thickness of the thin ink film formed on the various parts of the ink fountain roller depends on the width of the gap between the parts of the ink knife and the associated parts of the ink fountain roller.
  • the width of the gap varies as a function of the positions of the parts of the ink knife relative to the associated parts of the ink fountain roller.
  • the position of each part of the ink knife relative to its associated part of the ink fountain roller can be changed by adjusting the ink fountain key assigned to the respective part of the ink knife.
  • the thickness of the thin ink film on the various parts of the ink fountain roller can be changed by adjusting the ink fountain keys.
  • Ink fountain keys are typically manually adjusted by an operator while the print engine is in a maintenance state.
  • each ink fountain key can be manually turned on a knurled head or the like. be adjusted. It is also typical that each ink fountain key can be adjusted by activating a two-directional motor that drives the ink fountain key.
  • DE-A-37 43 646 relates to an apparatus for adjusting the amount of ink supplied in a printing press.
  • a zero point is set by means of a zero-point setting device, to which a new control operation of a squeegee position control device is to be related.
  • EP-A-0 344 546 relates to a device for setting ink zones on an ink fountain of a printing press.
  • a processor coupled to an input / output unit acts in parallel on several interfaces, which in turn are connected via a bus to a number of actuation modules.
  • the individual actuation modules each control a color zone and include a sensor for position feedback.
  • EP-A-0 131 107 shows an ink metering device for a printing press.
  • a measuring contact is arranged, through which a defined position, in which the cutting edge of the ink metering element rests on the ink fountain roller, is transmitted to the control unit as an output variable for adjusting the ink metering elements.
  • US-A-3,792,659 shows a control device which acts as a central control device for all ink fountains of the printing units of a rotary printing press.
  • the central control device is connected to two ink fountains per printing unit in parallel.
  • EP 0 344 546 relates to a control device for ink zones on ink fountains of printing presses, which contains a processor which communicates in parallel with four interfaces, the latter being connected via a separate bus to a plurality of actuation modules assigned to the ink zones.
  • the object of the invention is to improve the ink zone adjusting mechanism and its control.
  • the invention is preferably applied in lithographic printing machines and is the target position preferably a lithographic zero position for each ink fountain key in an ink fountain.
  • each ink fountain key is moved to bring the associated part of an ink knife into contact with the associated part of an ink fountain roller, and then each ink fountain key is moved to move the associated part of the ink knife a predetermined amount away from that position associated part of the ink fountain roller after these parts have been moved into contact with each other.
  • the gap is of such a width that a barely recognizable, thin ink film appears on the outer surface of the ink fountain roller part in question while the ink fountain roller rotates.
  • This position of the ink fountain key is its lithographic zero position.
  • the ink fountain keys are individually adjusted to their lithographic zero position to adjust the various parts of the ink knife relative to the associated parts of the ink fountain roller.
  • a first measured electrical value which corresponds to the lithographic zero position of each ink fountain key, is stored in a computer. This first measured electrical value of each ink fountain key is modified each time the respective associated ink knife part moves into contact with the associated part of the ink fountain roller and then the predetermined amount away from the ink fountain roller.
  • All ink zone screws each have desired positions for a given printing job and are set to these desired positions based on their assigned lithographic zero positions.
  • the lithographic zero position of each ink fountain key acts as one Reference point when adjusting them.
  • a second measured electrical value can be assigned to each ink fountain key and also stored in the computer. The second measured electrical value corresponds to the position of the ink fountain key desired for a given printing job. Since the desired position to which the ink fountain key is set is based on its lithographic zero position, the second measured electrical value is based on the first measured electrical value.
  • a microprocessor When a particular print job to be performed is selected, a microprocessor reads the first and second measured electrical values stored in the computer. The microprocessor then calculates these two values and generates a control output signal to move the ink fountain key to the desired position, which is a predetermined amount from its zero lithographic position. The predetermined amount by which the ink fountain key is removed from its zero lithographic position depends on the specific printing work chosen.
  • the desired actual position into which the ink fountain key is moved will also be modified the next time it is certain print work is chosen for execution.
  • the desired actual position of the ink fountain key will be modified because the predetermined distance between the lithographic zero position of the ink fountain key and the desired actual position into which it moved will remain the same.
  • the first measured electrical values are modified for all ink fountain keys and stored in the computer in the same way.
  • the present invention relates to a method and a device for adjusting the positions of ink fountain keys in an ink fountain of a printing press.
  • the present invention can be used in printing presses of various designs. The following description is only exemplary of the application of the present invention in a multi-color lithographic printing machine.
  • FIG. 1 shows a multicolor lithographic printing machine (10) with four printing units 20, 30, 40, 50. Even if four printing units are shown in FIG. 1, it goes without saying that the printing machine 10 can comprise a different number of printing units .
  • the printing units 20, 30, 40, 50 are each equipped with a pair of ink fountains.
  • Each printing unit comprises an upper and lower plate cylinder (not shown) and a blanket cylinder (not shown) which interacts with the respective upper and lower plate cylinder.
  • the blanket cylinders print on both sides of a web of material passing through the printing unit. It is known that dampening water is applied to every printing plate or plate cylinder.
  • a color box is also assigned to each plate cylinder for supplying ink to the printing plate on the plate cylinder.
  • the printing unit 20 has a pair of ink boxes 25, 26, the printing unit 30 has a pair of ink boxes 35, 36, the printing unit 40 has a pair of ink boxes 45, 46 and the printing unit 50 has a pair Color boxes 55, 56.
  • the color boxes 25, 35, 45, 55, 26, 36, 46, 56 are allocated to respective microprocessors 27, 37, 47, 57, which communicate with respective computer memories 28, 38, 48, 58.
  • microprocessors are commercially available and their structure and function are well known in the art. Thus, the microprocessors 27, 37, 47, 57 are not described in detail here.
  • the control desk 14 shown in FIG. 2 comprises a desk computer 77 which communicates with the distributed microprocessors 27, 37, 47, 57 via a high-speed serial network 79 and has an operator panel display 76.
  • the control panel 14 further includes a sheet inspection area 70 as a support for a printed sheet, which carries an image printed by one or a combination of the printing units 20, 30, 40, 50.
  • the control panel 14 also includes a series of manually operable remote selection switches 72 for controlling the positions of ink fountain keys in a selected ink fountain. The manner of choosing a particular color box is described hereinafter.
  • the row of switches 72 is divided into pairs of switches. Each pair of switches is associated with a respective ink zone screw and a predetermined zone area of the sheet inspection area 70.
  • the control panel 14 also includes a bar graph display 74 to assist the operator in adjusting ink fountain key to their desired positions.
  • the display panel 74 has a plurality of columns with rows of light emitting diodes ("LEDs").
  • the number of columns with LED rows corresponds to the number of color zone screws and the number of switch pairs 72.
  • the number of color zone screws is thirty six and the number of switch pairs 72 is thirty six, and therefore is Number of LED rows in display field 74 also thirty six.
  • the touch panel display 76 serves as a user-activated control of the operation of the printing units 20, 30, 40, 50, including the selection of a color box and the selection of the ink fountain key in this ink fountain for adjusting said ink fountain key.
  • the display panel 76 is electrically connected to the computer 77.
  • This display field 76 displays information from the computer 77 to the operator, and the operator can easily enter information into the computer 77 using a system software program by touching the display field at a suitable point.
  • Such touch panel displays are well known in the art and are not described in detail herein.
  • the console computer 77 preferably a Model 286 PC AT manufactured by Qualogy Corporation, San Jose, California, is electrically connected to the row of switches 72, the display panel 74, and the touch panel display 76.
  • the desk computer 77 and the touch panel display 76 cooperate to produce a number of graphical representations associated with the printing units 20, 30, 40, 50.
  • a monitoring panel 75 for the operator with a number of selector switches is located next to the touch panel display 76.
  • the ink fountain 25 has an ink fountain roller 21 which extends across the printing unit 20.
  • the structured ink knife 22 is located on the ink fountain roller 21 and extends across the ink fountain roller 21.
  • a gap 23 for the ink film forms between the outer circumferential surface 29 of the ink fountain roller 21 and the lower edge of the ink knife 22.
  • the gap 23 between the ink fountain roller 21 and the ink knife 22 has been shown enlarged for better illustration.
  • the gap 23 can be regulated laterally at various points along the ink fountain roller 21 in order to locally control the amount of ink fed from the ink fountain 25 to the printing cylinders (not shown) of the printing unit 10.
  • the ink knife 22 and ink fountain roller 21 form an ink reservoir 24 in a manner well known in the printing art. Ink flows from the ink reservoir 24 through the gap 23 formed between the outer peripheral surface 29 of the ink fountain roller 21 and the lower edge of the ink knife 22, and an ink film of controlled thickness is formed on the ink fountain roller 21.
  • the ink flow adjustment mechanism 60 comprises an ink zone screw 61 with turns which engage turns in a fixed part of the frame of the ink fountain 25.
  • the inking zone screw has a tip which presses against the associated part of the ink knife 22 and bends it, thereby providing a locally controllable control of the gap 23 between the ink knife 22 and the ink fountain roller 21.
  • the ink fountain key 61 is driven by a two-way servomotor 62. The motor 62 moves the ink fountain key 61 axially inward and outward.
  • a potentiometer 63 has a movable arm which is mechanically connected to the ink fountain key 61.
  • the potentiometer has a few external electrical connection points and an internal electrical connection point located between them, as is known.
  • the inner electrical connection point of the potentiometer 63 is mechanically connected to the movable arm of the potentiometer 63.
  • the position of the movable arm of the potentiometer 63 depends on the position of the ink fountain key 61.
  • the potentiometer 63 is activated at its outer electrical connection points so that an electrical signal is generated at its inner electrical connection point which indicates the position of the ink fountain key 61.
  • the inner connection point of the potentiometer 63 is electrically connected to a signal line 64.
  • the electrical signal of line 64 is connected to microprocessor 27 as an output signal.
  • the microprocessor 27 generates a control output signal via the signal line 65, which is generated after a preprogrammed process in an internal memory of the microprocessor 27.
  • the electrically activatable motor 62 drives the ink zone screw 61 in accordance with the electrical signal received via the line 65 from the microprocessor (27).
  • the lithographic zero position of an ink fountain key is the position which an ink fountain key assumes relative to the assigned part of an ink roller when a barely visible thin ink film appears on the lateral surface of this assigned part of the ink roller as it rotates.
  • the ink fountain key 61 is shown in FIG. 5 in its lithographic zero position.
  • the gap 23 shown in FIG. 5 between the ink fountain roller 21 and the ink knife 22 is for the better Illustration shown enlarged.
  • Adjustment of the ink fountain key 61 to its lithographic zero position, as shown in FIG. 5, begins from any position, as shown in FIG. 3. If adjustments of ink fountain keys are desired in a particular ink fountain, the operator first selects the ink fountain in which they are located.
  • Fig. 6 the process for setting the ink fountain keys in a particular ink fountain to their respective lithographic zero position is shown in a flow chart.
  • a first menu is displayed on the touch panel display 76.
  • the first menu shows a graphical representation of all ink fountains in all printing units 20, 30, 40, 50.
  • the operator selects one of the ink fountains in order to adjust the ink fountain key therein, which is the ink fountain 25 in the present example .
  • the color box 25 is selected by pressing on a touch-sensitive area of the touch panel display 76, whereupon the graphic representation of the color box 25 appears.
  • the intention is to provide a touch-sensitive area labeled "SELECT ALL" on the touch-screen display 76 so that all color boxes in the printing units 20, 30, 40, 50 can be selected at once by pressure from the operator. If all ink fountains are selected at the same time, all ink fountain keys located in them are also selected for adjustment.
  • a second menu appears on the touch panel display 76, as shown in stage 104.
  • a tactile sensitive area labeled "BEGIN CALIBRATION” appears in the second Touchscreen display menu 76.
  • the console computer 77 transmits information to the microprocessor 27 in the print engine 20, indicating that the ink fountain key in the ink fountain 25 have been selected for adjustment.
  • the microprocessor 27 uses this information to generate control signals for moving all ink fountain keys assigned to the ink fountain 25 into their respective lithographic zero position.
  • Each of the ink fountain keys located in the ink fountain 25 is adjusted in the same way. For the sake of simplicity, the adjustment of only one ink zone screw 61 in the ink fountain 25 is described in detail below.
  • the microprocessor 27 gives a control signal over line 65 to control the actuation of the motor 62.
  • the motor 62 is actuated and the ink fountain key 61 becomes axial moves in one direction so that the associated part of the ink knife 22 is moved from the position shown in FIG. 3 to a position shown in FIG. 4, in which this part of the ink knife 22 lies against the assigned part of the ink fountain roller 21.
  • step 110 it is determined whether the ink fountain key 61 has stopped its axial movement. If the determination at step 110 is negative, then the process proceeds to step 112. While the ink fountain key is being adjusted, a tactile sensitive area "HALT CALIBRATION" appears on the touch panel display 76 to stop any further adjustment when it is pressed. At step 112, it is determined whether the pressure sensitive area labeled "HALT CALIBRATION" was pressed. If the determination at step 112 is positive, the process returns to the beginning with the first menu shown on the touch panel display 76. If this determination at step 112 is negative, then the process moves to step 108 where the ink fountain key 61 movement continues.
  • step 110 the process proceeds to step 114.
  • the electrical value at the inner junction of the potentiometer 63 stops changing when the axial movement of the ink fountain key 61 stops. If the microprocessor 27 determines that the electrical value at the inner connection point of the potentiometer 63 no longer changes, the process continues in step 114 because the ink fountain key 61 has stopped moving. After the ink fountain key 61 has moved the associated part of the ink knife 22 against the assigned part of the ink fountain roller 21, as shown in FIG.
  • the control signal coming from the microprocessor 27 via the line 65 controls the motor 62, so that the ink fountain key 61 is moved in the opposite axial direction to move the associated part of the ink knife 22 a predetermined amount away from the associated part of the ink fountain roller 21, as shown in Fig. 5.
  • a value corresponding to the predetermined amount of movement of the ink knife 22 away from the associated part of the ink fountain roller 21 is stored in the memory 28.
  • the ink fountain key in the position shown in Fig. 5 is in its lithographic zero position.
  • the electrical signal appearing at this moment from the inner connection point of the potentiometer via line 64 is read by the microprocessor 27 and in the Memory 28 stored as shown in stage 116.
  • This electrical signal value assigned to the ink zone screw 61 remains stored in the memory 28 until the ink zone screw 61 is again set to its lithographic zero position in the manner just described.
  • the electrical signal value stored in the memory 28 and assigned to the ink zone screw 61 can be modified regularly by selecting the ink fountain 25 and then by pressing on the touch-sensitive area marked "BEGIN CALIBRATION" on the touch panel display 76, as described above.
  • the electrical signal value stored in the memory 28 is referred to below as the first measured electrical value.
  • the microprocessor 27 adjusts the other ink fountain key (not shown) associated with the ink fountain 25 in the same manner as the ink fountain key 61.
  • the calibration process is complete and a barely visible thin ink film appears on the outer surface of the ink fountain roller 21 as it rotates.
  • all ink fountain keys in the ink fountain 25 have been set to their lithographic zero position and the electrical signal values at the inner connection points of their assigned potentiometers have been stored in the memory 28, all adjustments of the ink fountain keys for a specific printing work are carried out on the basis of this reference point, i.e. the lithographic zero positions of the ink fountain keys.
  • the process to be followed is to select a particular print job and move the ink fountain key to the desired positions corresponding to the print job selected shown.
  • the operator presses a "PRESET" selector 80 located on the operator monitoring panel 75, as shown in step 200.
  • a menu appears on the touch panel display 76, as shown in step 202, in which a series of printing jobs is mentioned.
  • the number of print jobs appearing on the touch panel display 76 is fifteen.
  • An illuminated position indicator points to a print job appearing on display 76.
  • step 204 the operator selects the desired print job by pressing a particular tactile area present on the touch panel display 76 to move the illuminated position indicator to a position where it indicates the print job to be selected.
  • a tactile sensitive area appearing on the touch panel display 76 labeled "BEGIN PRESET” is depressed, as shown in step 206.
  • the console computer 77 transmits information to the microprocessors 27, 37, 47, 57 distributed in the printing units 20, 30, 40, 50, which indicates that a specific printing job has been selected .
  • the microprocessors 27, 37, 47, 57 then use this information to adjust all ink fountain keys in all ink fountains of the printing units 20, 30, 40, 50 on the basis of their lithographic zero positions to their desired positions for the particular print job selected.
  • Each ink fountain key is moved to its desired position relative to its lithographic zero position in the same way. For the sake of simplicity, only the adjustment of the ink zone screw 61 into its desired one Position described.
  • the first measured electrical value stored in memory 28 is associated with the zero lithographic position.
  • a second measured electrical value, which is assigned to the position of the ink fountain key 61 desired for a selected printing job, is also stored in the memory 28.
  • the microprocessor 27 After the microprocessor 27 has received the information from the desk computer 77 for adjusting the inking zone screw 61 in accordance with the selected printing work, the microprocessor 27 reads the first and second measured electrical values associated with the inking zone screw 61 and generates a control output signal for controlling the motor via line 65 62, so that the assigned part of the ink knife 22 is moved relative to the assigned part of the ink fountain roller 21. That is, by operating the motor 62, the ink fountain key 61 is moved to the desired position which is a predetermined distance from the lithographic zero position. The predetermined measure between the desired position and the lithographic zero position of the ink fountain key is based on the second measured electrical value, which in turn is based on the first measured electrical value. Thus, the actual position that the ink fountain key 61 assumes when it is moved to its desired position depends on its lithographic zero position.
  • the information stored in the memory 28 corresponding to the zero positions of the ink fountain keys in the ink fountain 25 is modified each time the ink fountain keys are set to their lithographic zero position.
  • the reference point changes, according to which the ink fountain keys are adjusted for a specific printing job. If this reference point, according to which the ink fountain keys are adjusted for a specific printing job, is modified in the manner described above, the mechanical wear or the like can occur, which could lead to inaccuracies in the positions of the ink fountain key and thus to poor print quality, be compensated.
  • selector switches 78 for selecting the color box intended for the adjustment next to the touch panel display 76. It would also be possible to have a keypad, with which the operator can select the particular color box or boxes in which the ink fountain key adjustment is to take place. It would also be possible to have a combination of selector switches, keypads and / or touch panel displays at the same time.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
EP92112389A 1991-09-03 1992-07-20 Verfahren und Vorrichtung zum Verstellen von Farbzonenschrauben in jeweilige Positionen Expired - Lifetime EP0531675B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/753,801 US5138944A (en) 1991-09-03 1991-09-03 Method and apparatus for setting respective positions of ink keys
US753801 1991-09-03

Publications (2)

Publication Number Publication Date
EP0531675A1 EP0531675A1 (de) 1993-03-17
EP0531675B1 true EP0531675B1 (de) 1997-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92112389A Expired - Lifetime EP0531675B1 (de) 1991-09-03 1992-07-20 Verfahren und Vorrichtung zum Verstellen von Farbzonenschrauben in jeweilige Positionen

Country Status (7)

Country Link
US (1) US5138944A (ja)
EP (1) EP0531675B1 (ja)
JP (1) JPH07112734B2 (ja)
CN (1) CN1070420C (ja)
AT (1) ATE151016T1 (ja)
CA (1) CA2071462C (ja)
DE (1) DE59208285D1 (ja)

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DE102011006522A1 (de) 2011-03-31 2012-10-04 Koenig & Bauer Aktiengesellschaft Verfahren zum Einstellen eines Farbflusses an einer Zone eines Farbwerks
DE102011006526A1 (de) 2011-03-31 2012-10-04 Koenig & Bauer Aktiengesellschaft System zum Einstellen eines Farbflusses an Zonen eines Farbwerks
DE102011006521A1 (de) 2011-03-31 2012-10-04 Koenig & Bauer Aktiengesellschaft System zum Einstellen eines Farbflusses an einer Zone eines Farbwerks

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DE10353868B4 (de) * 2002-12-12 2014-07-24 Heidelberger Druckmaschinen Ag Darstellung von Daten in einer Bedruckstoff verarbeitenden Maschine
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JP4700293B2 (ja) * 2004-05-25 2011-06-15 株式会社小森コーポレーション 印刷機のインキ供給量調整方法および装置
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JPH0796293B2 (ja) * 1986-12-29 1995-10-18 東芝精機株式会社 印刷機のインク供給量調整装置
JPS63249655A (ja) * 1987-04-06 1988-10-17 J P Ii Kk 印刷機のインキ壷装置
CH677211A5 (ja) * 1988-05-31 1991-04-30 Bobst Sa
DE3914831C3 (de) * 1989-05-05 1999-05-20 Roland Man Druckmasch Vorrichtung zum zonenweisen Einstellen eines Dosierspaltes einer Farbdosieranlage einer Druckmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011006522A1 (de) 2011-03-31 2012-10-04 Koenig & Bauer Aktiengesellschaft Verfahren zum Einstellen eines Farbflusses an einer Zone eines Farbwerks
DE102011006526A1 (de) 2011-03-31 2012-10-04 Koenig & Bauer Aktiengesellschaft System zum Einstellen eines Farbflusses an Zonen eines Farbwerks
DE102011006521A1 (de) 2011-03-31 2012-10-04 Koenig & Bauer Aktiengesellschaft System zum Einstellen eines Farbflusses an einer Zone eines Farbwerks
DE102011006522B4 (de) * 2011-03-31 2013-06-06 Koenig & Bauer Aktiengesellschaft Verfahren zum Einstellen eines Farbflusses an einer Zone eines Farbwerks
DE102011006521B4 (de) * 2011-03-31 2013-09-19 Koenig & Bauer Aktiengesellschaft System zum Einstellen eines Farbflusses an einer Zone eines Farbwerks
DE102011006526B4 (de) * 2011-03-31 2013-09-19 Koenig & Bauer Aktiengesellschaft System zum Einstellen eines Farbflusses an Zonen eines Farbwerks

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Publication number Publication date
CN1079429A (zh) 1993-12-15
JPH07112734B2 (ja) 1995-12-06
JPH05246014A (ja) 1993-09-24
DE59208285D1 (de) 1997-05-07
US5138944A (en) 1992-08-18
EP0531675A1 (de) 1993-03-17
CA2071462C (en) 1997-07-22
ATE151016T1 (de) 1997-04-15
CN1070420C (zh) 2001-09-05
CA2071462A1 (en) 1993-03-04

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