EP0683750A1 - Process and device for the correctly positioned transfer of folded signatures in folders - Google Patents
Process and device for the correctly positioned transfer of folded signatures in foldersInfo
- Publication number
- EP0683750A1 EP0683750A1 EP94913023A EP94913023A EP0683750A1 EP 0683750 A1 EP0683750 A1 EP 0683750A1 EP 94913023 A EP94913023 A EP 94913023A EP 94913023 A EP94913023 A EP 94913023A EP 0683750 A1 EP0683750 A1 EP 0683750A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gripper
- cylinder
- gripper cylinder
- folded
- signatures
- 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
Links
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
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/02—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles
- B65H29/06—Delivering or advancing articles from machines; Advancing articles to or into piles by mechanical grippers engaging the leading edge only of the articles the grippers being carried by rotating members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2404/00—Parts for transporting or guiding the handled material
- B65H2404/20—Belts
- B65H2404/26—Particular arrangement of belt, or belts
- B65H2404/261—Arrangement of belts, or belt(s) / roller(s) facing each other for forming a transport nip
-
- 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
- B65H2553/40—Sensing or detecting means using optical, e.g. photographic, elements
- B65H2553/41—Photoelectric detectors
Definitions
- the invention relates to a method and a device for the correct position transfer of cross-folded signatures in folders for rotary printing presses according to the preamble of claim 1.
- DE 30 49 595 AI discloses a belt section for transporting and slowing down folding products between two successive stations of a folding apparatus, which consist of at least two successive sections driven at mutually graded speeds, each having an upper and a lower set of belts, each with several have bands arranged parallel to each other.
- a delay line can be arranged between a jaw cylinder and a gripper cylinder.
- signatures Both when accelerating folded or unfolded signatures, hereinafter always referred to as signatures, and when delaying signatures, a high proportion of silicone on the surface and thus a smooth surface of the folded product can lead to poor accelerations or delays in the folded products. If the signature is insufficiently accelerated, the gripper system detects it insufficiently so that the signature can be lost. If the signature is deficiently delayed, it penetrates so deep into the gripper system due to its inertial forces that it is not released from the gripper system. The two shortcomings mentioned each lead to undesirable blockers in the folder.
- a device for preventing plugs in the folder of printing press in which by Triggering an electrical contact in the event of the accumulation or lack of copies, a knife is operated to cut off the running paper web and the machine is stopped by providing a photo cell between the jaw cylinder and the paddle wheel and a pulse generator controlled depending on the machine speed, provided on the jaw cylinder both are connected to a comparison and switching device, which triggers the cutting of the paper web and the switching off of the machine.
- a disadvantage of this device is that the machine is switched off in the event of positional inaccuracies of folded signatures.
- the invention has for its object to provide a method and an apparatus for the correct transfer of folded signatures which are subject to a change in speed between two successive stations of a folder, regardless of a specific surface condition or a certain mass of the folded signatures.
- the invention makes it possible become to correct the position of the signatures immediately after passing through tape control systems at the inlet into the gripper systems of a gripper cylinder in the event of impending position inaccuracies, without the need to separate the incoming paper web or to stop the machine.
- FIG. 1 is a schematic side view of a folder with a device for correctly transferring signatures
- 2.2 is an enlarged view of a gripper of a gripper system according to FIG. 2.1,
- FIG. 3 is a view A of FIG. 2,
- FIG. 4 shows a section IV - IV of FIG. 3, in an enlarged view
- FIG. 5 is a block diagram of a device for positioning
- FIG. 6 shows a detail Y according to FIG. 1, 7 is a diagram showing signals from a second evaluation unit,
- Fig. 9 is a schematic representation of a control of a device according to the invention in a further embodiment.
- the folder shown in Fig. 1 has two parallel side walls for receiving cylinders, of which only one side wall is shown and designated 1.
- a paper web strand 2 passes through a pair of draw rollers 3 and subsequently through a cross-cutting device consisting of cross-cutting cylinder 4 and cutting groove cylinder 6.
- the signatures, not shown, cut by the cross-cutting device 4, 6 are accelerated between two known belt guidance systems 7, 8, of which the second belt guidance system 8 extends to the periphery of a subsequent five-part collecting cylinder 9 and the first belt guidance system 7 extends to the circumference of the collecting cylinder 9 creates and reaches up to a five-part jaw cylinder 11.
- the collecting cylinder 9 has on its circumference in each case five gripper systems arranged at a uniform distance, designated by 12, known per se and likewise five by 13 designated, known folding knife systems.
- a folded signature 39 (FIG. 2.1) is created by the action of the folding knife systems 13 of the collecting cylinder 9 in the folding jaw systems 14 of the folding jaw cylinder 11, which signature rests both on the circumference or the outer surface of the folding jaw cylinder 11 and on a belt guide system 16 .
- the folded signature 39 (FIG. 2.1) is transferred to a three-part gripper cylinder 21 provided with three gripper systems 19, which one the folded signatures 39 between tape guide systems 17, 22 and 23, 24 running parallel to one another feeds the first paddle wheel 27 with a first transverse fold delivery 28.
- the folded signatures 39 can alternatively be fed to a second paddle wheel 33 and a second transverse fold delivery 34 via the belt guide system 16, which continues via a deflection roller 32 with a belt guide system 31 running parallel thereto.
- 2.1 shows the detail X according to FIG. 1 with a side view of the gripper cylinder 21 and without belt guidance systems.
- a first position-determining device or light barrier 38 which is fixed to the frame and consists of a transmitter 36 and a receiver 37 is arranged, which detects the time of arrival of a transverse fold edge 62 of a folded signature 39 moved in the production direction H.
- the light barrier 38 is arranged at a distance d from the periphery of the gripper cylinder 21 so that the signatures 39 are transferred to the gripper systems 19 after they have been transported approximately horizontally between the belt guidance systems.
- the distance d corresponds to approximately half a length of a signature 39 (FIG. 2.1).
- a one-armed lever 46 which runs parallel to the side frame 1 and has a first end 47 and which likewise rotates with the axle pin 44, is fastened to an axle pin 44 of the gripper cylinder 21 in a non-positive and positive manner.
- the lever 46 has a fork-shaped flag 49 which is bent at right angles and points in a direction remote from the part and the cylinder and which moves on a circular path which has the same or approximately the same diameter as the gripper cylinder 21.
- the flag 49 interrupts a light beam 51 which strikes a receiver 54 from a transmitter 52 of a light barrier 53.
- the transmitter 52 and the receiver 54 are held on the side of the side frame 1 remote from the cylinder by means of a bearing block 56, so that the Light beam 51 runs parallel to the side frame 1.
- the device consisting of flag 49 and light barrier 53 is referred to as the second position determination device.
- the position of the gripper cylinder 21 is queried via this flag 49.
- This flag 49 moves on the circular path with the same diameter as the gripper cylinder 21.
- the flag 49 is interrogated with the aid of the light barrier 53.
- the position of the transverse fold edge 62 of the sheet 39 is also the same type of light barrier 38 as in the case the flag recognition queried.
- the controller now has two signals, one
- a signal U is generated at a time t 67, 68 or 69
- a to C (can be determined by drawing a vertical line between the two diagrams in FIGS. 7 and 8), no regulation takes place. If the sheet signal is 67, "folded signature too early"
- the device behaves analogously if there is a sheet signal 69, "folded signature too late” in area C (shown in full lines in FIG. 8). Depending on whether the signature 39 is too early (signal 67, area A) or too late (signal 69,
- F t 'minus t is positive or negative, is over a
- Schmitt trigger 72 and a power amplifier 64 trigger a corresponding signal which activates a motor of a motor gear unit 63. This motor superimposes the main motor of the
- Gripper cylinder 21 its differential speed, so as to bring the time difference t minus t to zero, d. H.
- the gear unit of the motor gear unit 63 can consist of a harmonic drive gear unit or also of an obliquely toothed drive gear which can be adjusted in the axial direction by means of a threaded spindle and an actuator, which is non-positively and positively connected to a gear which is connected to a drive gear of the gripper cylinder 21 combs.
- a potentiometer 66 reports the respective position of the gripper cylinder 21. All elements 37, 42, 43 shown in FIG. 5; 54, 57, 43; 72, 64, 63, 66, 43, 71 are connected by electrical lines, not specified.
- the signals available at the receivers 37, 54 become smaller. From a certain degree of contamination, a separate signal is sent to the evaluation unit 43 to indicate a Avoid prospective disruption. So z. B. in the vicinity of the transmitter 36, 52 and receiver 37, 54 blowing air nozzles, and be turned on to remove the pollution.
- a detail Y according to FIG. 1 is shown with the arrangement of the device in the inlet of the signatures 39, between the belt guidance systems 7, 8 leading to the collecting cylinder 9.
- the elements used have the same part numbers provided like the elements or parts used in the first embodiment.
- a light barrier 38 which is fixed to the frame and consists of transmitter 36 and receiver 37 is arranged shortly before entering the collecting cylinder 9, which signals the arrival of a transverse fold edge 62 of a signature 39 with its light beam 41 to the evaluation unit 43 and is stored in the memory stored in the evaluation unit 64.
- this cylinder-fixed flag 49 breaks through a light beam 51 which is emitted by a transmitter 52
- Photoelectric sensor 53 meets a receiver 54.
- the signals of both light barriers 38, 53 are compared in an evaluation unit 43 with regard to their time difference (FIG. 5), as already shown in the first exemplary embodiment. If there are time deviations when entering the gripper system 12 of the collecting cylinder 9, a motor-gear unit 63 is connected to the drive of the cross-cutting device 4, 6 via the evaluation unit 43, as shown in FIG. 5, for synchronization between gripper system 12 of the collecting cylinder 9 and the signature 39 entering the light barrier 38 by turning the cross-cutting cylinder 4 and the cutting groove cylinder 6.
- a light barrier 38 at the outlet of the belt guide systems 23, 24 or 31, 16 ending above the paddle wheels 27, 33 in order to determine the position of a leading edge 62 of a folded signature 39.
- a second light barrier 53 fixed to the frame for determining the position of the blades could be interrupted by means of a lever 46 with a flag 49 attached to the shaft of the blade wheel 27, 33 with each blade wheel rotation.
- the evaluation is carried out via an evaluation unit 43, which is connected to a motor gear unit 63, which in turn rotates the drive of the paddle wheel 27, 33 by an angle of rotation alpha, if there is a difference between the actual position and the target position of the folded signature 39.
- FIG. 9 a possibility for regulating a correct transfer of folded signatures to a gripper cylinder is shown.
- parts 87; 73, 74; 39, 53, 83; 84; to a difference former 76 which, at a point in time when the leading transverse fold edge 62 of the signature 39 passes through a light barrier 53 comprising a transmitter 52 and a receiver 54, has a preset value (target value) for the length of the path which the transverse fold edge 62 of a signature 39 from the reference line of measurement of the light barrier 53 must cover the desired position of the transverse fold edge 62 in the gripper systems 19.
- This path is measured in degrees (or pulses) of the circumferential angle of the gripper cylinder 21 via the angle encoder 73, 74.
- the signature 39 of the leading transverse fold edge 62 can reach the triggering measuring line of the light barrier 53 correctly, sooner or later (measured in angular degrees of the gripper cylinder 21), which in any case triggers a switching pulse.
- this switching pulse is fed to a trigger 83, which has a continuously counting, with each new revolution of the angle encoder 73, 74
- Counter reading zero-switching counter 84 switches.
- the counter 84 receives the counter pulses from the angle encoder 73, 74.
- the counter 84 outputs its counter reading at the time of switching through the light barrier 52, 54 - in the form of pulses - to a pulse difference generator 76 (difference counter).
- the position of the gripper system (s) 19, ie, for example, an intended target position of the transverse fold edge 62 in the gripper system, is several or a certain angle (s) z. B. 0.0000 °; 0.0000 °, 120.0000 °, 240.0000 ° of code disk 73 exactly assigned.
- the exact angular position of each desired gripper system 19 and thus the “instantaneous” distance in angular degrees - or a corresponding number of pulses - of the gripper cylinder 21 of the desired position of the gripper system 19 from the Measuring line of the light barrier 53 can be determined, that is to say an instantaneous "it distance".
- This "actual distance” is compared with a fixed - e.g. B. via the digital decade potentiometer 87 preset "target distance” at the time you pass through the leading transverse fold edge 62 of this signature 39 through the light barrier 38 (36, 37) which generates a switching pulse.
- the target value is compared with the actual value and a manipulated variable is formed which the difference former 76 of a storage unit 77 for the purpose of correcting the angular position of the Gripper cylinder 21 passes (the phase position of a folded signature 39 is determined from the position or distance d - FIG.
- the difference images 76 receives its setpoint input via a digital decoder potentiometer 87.
- the actual value detection of the position of the gripper systems 19 on the gripper cylinder 21 is carried out by means of an angular encoder 74 which is fixed at the side and which scans a code disc 73 which is fixed to the axle and transmits this digital actual value to a counting unit 84 .
- the pulse counter 84 which can be set to zero, transmits its value at the time of a switching pulse of the trigger 83 to the difference former 76 at the time when the transverse fold edge 62 passes through, but only when the machine is in the "pressure-on" position, ie Contact is closed.
- the counter unit 84 can be triggered so that it only determines the actual values determined by the angle encoder 73 for the position of the angle of rotation of the gripper cylinder 21 for selected revolutions, e.g. B. every second revolution of the gripper cylinder 21 to the difference former 76 in the manner.
- the difference image 76 determines a possible pulse difference in the number of target and actual value pulses and forwards them to the memory unit 77.
- the memory unit 77 gives the pending positive or negative differential pulses for a single application of de ⁇ Gripper cylinder 21 with a positive or negative speed for a single gripper cylinder revolution to a frequency converter 81, which drives a three-phase motor 82 accordingly.
- Both the three-phase motor 82 and a medium remote control 89 controllable main motor 79 act together via a differential gear 78 on the axle journal 44 of the gripper cylinder, which then briefly receives a speed that is higher or lower than the original speed of the gripper cylinder 21 and after the positive or negative Speed application continues at the original speed.
- signatures 39 are by means of the tape control system 16; 17 transported from one cylinder to the subsequent gripper cylinder 21, where the band guide system 16; 17 as close as possible to the circumference of the gripper cylinder 21 and, as far as possible, a tangential transfer of the signatures 39 to the gripper cylinder 21 and thus to the gripper systems 19.
- the light barrier 53 is on or in the vicinity of the belt guidance system 16; 17 arranged.
- the switching pulse generated by the light barrier 53 is used to trigger a momentary measurement of the actual angular position 91 de ⁇ or of the gripper systems 19 to adopt the selected signature (s).
- a current actual angular position 91 of the gripper system 19 of the gripper cylinder 21 provided for taking over the predetermined signature 39 is determined at the same time and determined “prognostically” on the basis of both data that z. B. the "signatures too early” 93 or the “signatures in target position” 92 or the “signatures too late” 91 will arrive, provided that the conditions under which the predetermined signatures 39 are transported do not change in the meantime.
- the "predicted" angular position 91 is compared with the desired angular position 92 of the provided gripper system 19 and an electrical difference value signal with the value zero or, in the case of deviations, with a positive or negative Value formed.
- the difference value signal is converted in an electronic control unit into a positive or negative control value for a circumferential rotation of the gripper cylinder 21 in relation to the position of the folded edge 62 of the predetermined folded signature 39 recorded by measurement.
- the gripper cylinder 21 by means of drive means, for. B.
- the gripper cylinder 21 If it is necessary to adjust the gripper cylinder 21 counter to its direction of rotation H, i.e. counterclockwise, then the gripper cylinder 21 is acted upon according to the calculated negative value during a rotation angle rotation, so that the gripper cylinder 21 runs for a short time more slowly than the previous operating speed.
- the phase position between the drive shaft 44 and the cylinder body of the gripper cylinder 21 can also be changed accordingly. This can be done in that a coupling acts between the axis 44 of the gripper cylinder 21 and the gripper cylinder body, which for the purpose of rotating the gripper cylinder 21 in relation to the axis 44 of the gripper cylinder 21 is briefly released for the action of an electromotive actuator and the gripper cylinder body on the shaft 44 is rotated accordingly via an electronic gear transmission.
- a area signal 67 (sheet too early)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4313942 | 1993-04-28 | ||
DE4313942 | 1993-04-28 | ||
PCT/DE1994/000471 WO1994025383A1 (en) | 1993-04-28 | 1994-04-28 | Process and device for the correctly positioned transfer of folded signatures in folders |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0683750A1 true EP0683750A1 (en) | 1995-11-29 |
EP0683750B1 EP0683750B1 (en) | 1998-06-24 |
Family
ID=6486620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94913023A Expired - Lifetime EP0683750B1 (en) | 1993-04-28 | 1994-04-28 | Process and device for the correctly positioned transfer of folded signatures in folders |
Country Status (5)
Country | Link |
---|---|
US (1) | US5732944A (en) |
EP (1) | EP0683750B1 (en) |
JP (1) | JP2717028B2 (en) |
DE (2) | DE4492614D2 (en) |
WO (1) | WO1994025383A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19707657A1 (en) * | 1997-02-26 | 1998-09-10 | Heidelberger Druckmasch Ag | Sheet sensor for sheet printer with hollow cylindrical drum |
JPH1149399A (en) * | 1997-07-29 | 1999-02-23 | Brother Ind Ltd | Sheet carrier device and correction method of sheet carrying quantity in sheet carrier device |
FR2779709B1 (en) * | 1998-06-11 | 2000-09-01 | Heidelberger Druckmasch Ag | NOTEBOOK SLOWING DEVICE |
JP4791631B2 (en) * | 2000-12-26 | 2011-10-12 | 株式会社東芝 | Paper sheet processing equipment |
DE10148503C5 (en) * | 2001-10-01 | 2008-01-31 | Koenig & Bauer Aktiengesellschaft | Folder with circumferentially adjustable cylinder |
JP5256766B2 (en) * | 2008-02-18 | 2013-08-07 | 澁谷工業株式会社 | Article processing equipment |
JP2010221662A (en) * | 2009-03-25 | 2010-10-07 | Seiko Epson Corp | Sheet conveying device, recorder provided with sheet conveying device, and sheet conveying method |
DE102010028350B4 (en) * | 2010-04-29 | 2014-05-22 | Koenig & Bauer Aktiengesellschaft | Method for controlling a rotational angle position and optionally a rotational speed of at least one position-controlled drive motor of at least one device of a folding apparatus |
DE102010030658B4 (en) * | 2010-06-29 | 2013-06-20 | Koenig & Bauer Aktiengesellschaft | Method for controlling a position of a product section to be held by a holding device on the circumference of a cylinder of a folding apparatus |
US8762520B2 (en) | 2010-07-02 | 2014-06-24 | At&T Intellectual Property I, L.P. | Method and system to detect a predictive network signature |
US9156386B2 (en) | 2011-12-19 | 2015-10-13 | Fca Us Llc | Armrest assembly |
US9022466B2 (en) | 2011-12-19 | 2015-05-05 | Fca Us Llc | Armrest assembly |
JP7012670B2 (en) * | 2017-09-27 | 2022-01-28 | 三菱重工機械システム株式会社 | How to adjust the processing position of the box making machine and corrugated cardboard sheet |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1230811B (en) * | 1963-05-17 | 1966-12-22 | Maschf Augsburg Nuernberg Ag | Device for preventing stoppers in the folder of printing machines |
DE2756223C2 (en) * | 1977-12-16 | 1982-12-30 | GAO Gesellschaft für Automation und Organisation mbH, 8000 München | Method for controlling the infeed of goods to be transported into a spiral stacker and device for carrying out the method |
CH630583A5 (en) * | 1978-06-30 | 1982-06-30 | Ferag Ag | DEVICE FOR MOVING AWAY OF FLAT PRODUCTS INCLUDING IN A DOMESTIC FLOW, IN PARTICULAR PRINTED PRODUCTS. |
CH637091A5 (en) * | 1979-01-29 | 1983-07-15 | Ferag Ag | DEVICE FOR SUPPLYING FLAT PRODUCTS, INCLUDING PRINTED PRODUCTS, INCLUDING PRESSURE PRODUCTS, TO A TRANSPORTER. |
DE3049595A1 (en) * | 1980-12-31 | 1982-07-08 | Albert-Frankenthal Ag, 6710 Frankenthal | TAPE LINE FOR TRANSPORTING AND SLOWING DOWN FOLDED PRODUCTS |
DE3138540A1 (en) * | 1981-09-28 | 1983-04-14 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | DEVICE FOR FEEDING BOWS DETACHED ON A PUTTING TABLE AND ALIGNED TO THE FRONT AND SIDE EDGE |
GB2168687A (en) * | 1984-12-21 | 1986-06-25 | De La Rue Syst | Sheet feeding |
CA1276656C (en) * | 1985-04-27 | 1990-11-20 | Toshio Fukushima | Media receiving unit |
DE3534157A1 (en) * | 1985-09-25 | 1987-04-02 | Frankenthal Ag Albert | Folding apparatus |
JPH07112897B2 (en) * | 1986-03-20 | 1995-12-06 | 株式会社日立製作所 | Paper sheet stacking device |
DD265605A1 (en) * | 1987-11-02 | 1989-03-08 | Polygraph Leipzig | SENSOR DEVICE FOR POLYGRAPHIC MACHINES |
US4986526A (en) * | 1989-09-25 | 1991-01-22 | Xerox Corporation | Sheet registration calibration |
JP2609754B2 (en) * | 1990-10-19 | 1997-05-14 | エス・ケイエンジニアリング株式会社 | Sheet stacking device |
US5103733A (en) * | 1990-10-24 | 1992-04-14 | A. B. Dick Company | Printing machine with continuous sheet feed mechanism |
-
1994
- 1994-04-28 DE DE4492614T patent/DE4492614D2/en not_active Expired - Fee Related
- 1994-04-28 EP EP94913023A patent/EP0683750B1/en not_active Expired - Lifetime
- 1994-04-28 DE DE59406325T patent/DE59406325D1/en not_active Expired - Fee Related
- 1994-04-28 WO PCT/DE1994/000471 patent/WO1994025383A1/en active IP Right Grant
- 1994-04-28 JP JP6523746A patent/JP2717028B2/en not_active Expired - Lifetime
- 1994-04-28 US US08/824,181 patent/US5732944A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9425383A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5732944A (en) | 1998-03-31 |
JPH08510982A (en) | 1996-11-19 |
DE59406325D1 (en) | 1998-07-30 |
DE4492614D2 (en) | 1996-06-27 |
EP0683750B1 (en) | 1998-06-24 |
WO1994025383A1 (en) | 1994-11-10 |
JP2717028B2 (en) | 1998-02-18 |
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