WO1996034820A1 - Bogenbremse im ausleger einer druckmaschine - Google Patents
Bogenbremse im ausleger einer druckmaschine Download PDFInfo
- Publication number
- WO1996034820A1 WO1996034820A1 PCT/DE1996/000714 DE9600714W WO9634820A1 WO 1996034820 A1 WO1996034820 A1 WO 1996034820A1 DE 9600714 W DE9600714 W DE 9600714W WO 9634820 A1 WO9634820 A1 WO 9634820A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- brake
- printed
- sheet brake
- suction
- Prior art date
Links
- 238000000151 deposition Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 4
- 241000124008 Mammalia Species 0.000 claims 1
- 230000000694 effects Effects 0.000 description 9
- 238000007664 blowing Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 2
- 206010038743 Restlessness Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000474 nursing effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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
- B65H29/68—Reducing the speed of articles as they advance
- B65H29/686—Pneumatic brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/10—Handled articles or webs
- B65H2701/17—Nature of material
- B65H2701/176—Cardboard
-
- 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 sheet brake according to the preamble of claim 1.
- printed sheets are transported from a feeder through printing units and then on a chain conveyor system to a so-called delivery arm, where they are printed on a stack.
- Each printed sheet on the delivery must be delayed from a maximum conveying speed to the rest position.
- the printed printed sheet must be lowered onto the stacking surface from a floating position.
- a sheet delivery device for a rotary printing press has become known from DE-OS 2 720 674.
- a braking device for incoming printed sheets is provided near the rear edge of a stack on a delivery arm of the rotary printing press.
- This consists of one Box with several slits on the top. This box is blown with air that escapes through a first part of shooters directed against the direction of the sheet.
- further slits arranged at the top of the box create negative pressure flows towards the box. With the help of the vacuum or this air intake one can
- Gripper systems of the chain conveyor held over the box passing quasi quasi caught or sucked in and held with a certain force. It slips over the crate during further transport and is decelerated due to the holding force when the gripper systems release it.
- the printed sheet can then be guided against stops in the area of the delivery stack.
- the sheet path or chain conveyor is inclined downward in the area of the delivery above the stack in the sheet travel direction. This is very disadvantageous, since the intervention space for a possibly intended sample sheet removal is severely restricted.
- provision is also made for the box or the braking device to be subjected to a lifting movement transverse to the sheet running direction of the printed sheets.
- the printed sheet to be deposited is guided on the gripper systems from the direction of sheet travel, down to approximately the height of the upper edge of alignment stops on the rear edge of the stack, and can be deposited there.
- the sheet delivery device also provides the additional driven alignment stops on the rear edge of the delivery stack, which ensure that the printed sheets to be deposited are just pushed against leading edge stops. Due to the blow suction effect on the braking device, the printed sheet must be held by the grippers almost to the last moment in order to be able to guide it downwards with sufficient accuracy against the leading edge stops.
- the downward-inclined sheet guide is also the braking device described, however, corresponds to a so-called sheet catching device.
- Sheet catchers generally serve to guide a printed sheet in its path and to force it in a certain direction, with an intended braking effect merely to smooth the sheet in Direction of sheet travel can serve, but can serve less braking due to the priority guiding effect.
- a sheet delivery device is known from DE-GM 80 03 052. It shows the combination of a suction roll and a blow-suction device in the form of a
- Sheet brake which is arranged in the sheet running direction in front of the rear edge of a sheet stack in a sheet delivery and can be raised and lowered oscillating between a catching position and a depositing position.
- the blag suction device and the suction roller are rigidly connected to one another so that they carry out the oscillating lifting movement together.
- the blow-suction device is intended to capture the printed sheets and feed them to the suction roll.
- the device has various disadvantages in the treatment of the printed sheets to be deposited. On the one hand, the guiding of the printed sheets on the wheels of the suction roll is only selective, so that a smooth, as flat as possible delivery is not always possible, especially with large-sized printed sheets.
- blow-suction device blows an air stream under the incoming printed sheet, which causes unrest in the sheet run and also prevents the printed sheets from being caught, particularly in the case of large-format printing material. In addition, this measure also impedes the flat display of the printed sheets.
- So-called pick-up grippers are known as further aids for the display of, in particular, large-format printed sheets. These take over the supplied sheet from the gripper systems of the chain conveyor and guide it against the leading edge stops while slowing down the speed. They only act selectively on the printed sheets, which can lead to distortions and uneven braking. In addition, the printed sheets are subjected to a strong deceleration in an unstable orientation plane at high speeds.
- the object of the invention is therefore to improve a sheet brake according to the preamble of patent claim 1 so that the printed sheet to be laid out can be deposited with greater accuracy and safely, with the planar position of the sheet also being positively influenced when laid out.
- the printed sheet is advantageously guided, stretched and lowered in two stages on its rear edge. It can also be held at the front edge by grippers and at the rear edge by the sheet brake, without accepting disadvantages.
- the sheet brake in a third version thanks to its particularly suitable shape, keeps the printed sheet taut and spread in the lateral direction, it can be placed safely and in a stretched position on the delivery stack with an optimally adjustable speed reduction. In this way, since the printed sheet is deposited almost subject to a compulsory guidance, it practically makes a precise landing.
- the sheet brake is designed in such a way that, even with different formats, the sheet cycle is recorded and stored appropriately.
- the drive is designed to be self-synchronizing during the adjustment.
- Fig. 8 is a plan view of the front edge of the sheet brake
- Fig. 9 shows a cross section through a variant of the sheet brake.
- a delivery of a sheet-fed rotary printing press is shown.
- a printed sheet 1 is guided on gripper systems of a chain conveyor system 2 to a delivery stack 3.
- a sheet brake 5 is arranged in the area of a rear edge 4 of the delivery stack 3.
- Upstream of the sheet brake 5 in the sheet travel direction R is a sheet catching device 25. This is arranged in the curvature of the chain conveying system 2.
- the sheet brake 5 serves to brake the printed sheet 1 from its high conveying speed to a low delivery speed before it is deposited on the delivery stack 3.
- a take-off gripper 23 is provided on the delivery arm in the area of a front edge 24, which takes over the printed sheet 1 from the chain conveyor 2 and leads to the front edge 24 against stops.
- Fig. 2 the rear edge 4 of the boom stack 3 is shown in an enlarged view.
- the arrangement of the sheet brake 5 is shown in its position in relation to the chain conveyor system 2, which carries a printed sheet 1.
- the sheet brake device 25 is preceded by the sheet catching device 25 in the sheet travel direction R. This is only shown in more detail in its operating principle. It is as with the so-called
- Blowing suction effect working suction device designed to keep the printed sheet 1 him a path parallel to the chain conveyor system 2.
- blowing nozzles directed against the sheet running direction R are provided, which generate an air poster under the printing sheet 1.
- the sheet brake 5 is shown in a solid and in two dashed positions 5.1 and 5.2. These indicate a proposed range of movement of the sheet brake 5 in the vertical direction. Position 5.1 represents the transfer position of the sheet 1. Position 5.2 is the storage position.
- FIG. 3 shows a cross section through the entire system of the sheet brake 5.
- the illustration details the attachment of the sheet brake 5 for one of its fastening points, which are arranged at least two across the width.
- the sheet brake 5 is in this case arranged on a holder 6 which is movable on a vertical guide bolt 7 arranged fixed to the frame.
- a drive pin 8 is fastened to the holder 6.
- a crank 9 acts on this drive pin 8.
- the crank 9 is rotatably mounted on an eccentric 10, which in turn is connected to a shaft 11. When the shaft 11 rotates, the sheet brake 5 consequently moves up and down by the crank movement on the guide pin or pins 7. The movement is therefore straight and sinusoidal in terms of time with respect to a transported printing sheet 1.
- Fig. 4 the drive configuration is shown in longitudinal section.
- a part of the sheet brake 5 is shown on one of the holders 6.
- the holder 6 is arranged on the guide pin 7 by means of a longitudinal guide 12 and connected to the drive pin 8.
- the crank 9 connects the eccentric 10 or the shaft 11 with the Drive pin 8.
- the shaft 11 is driven via a cardan shaft 13 by a drive 15 of the printing press at a speed which corresponds to the frequency of the printed sheets 1 previously transported.
- the sheet brake 5 shows the setting of the sheet brake 5 in relation to different sheet formats.
- the sheet brake 5 is arranged in the sheet feeding direction on one or two adjusting spindles 14. Each adjusting spindle 14 can be driven by remote control.
- the propeller shaft 13 is provided with a telescopic guide, which makes it possible that the propeller shaft 13 adjusts itself automatically to different lengths when the sheet brake 5 is displaced.
- the cardan shaft 13 can be set to different lengths between the positions I to HI, the rotational relative relationship between the drive 15 and the lifting gear within the sheet brake 5 not changing.
- Position I represents a maximum sheet format
- position Hl stands for a minimum sheet format. These positions can be approached automatically when setting the sheet format.
- the sheet brake 5 can be adjusted relative to the rear edge 4 of the delivery stack 3 by means of the adjusting spindles 14 in order to optimize the conditions of the deposit during operation.
- the drive shaft 13 is driven by the drive 15 in a machine-synchronized manner.
- the sheet brake 5 consists of a hollow box section which has a suction chamber 16 on its front side.
- a suction air supply 17 is connected to the suction chamber 16.
- Another chamber 18 is provided in the area of the sheet brake 5 opposite the suction chamber 16.
- the suction chamber 16 is provided on its upper side with ventilation holes 19 or a ventilation slot.
- a suction bar 20 is attached to the suction chamber 16 opposite the ventilation holes 19.
- the suction bar 20 is provided on its upper side with a flat groove 21.
- the groove 21 is connected to the ventilation bores 19 by way of sucking openings 22.
- the arrangement of the rigid suction bar 20 on the suction chamber 16 represents one of the essential features of the sheet brake 5. This is the basis for its very simple construction.
- the assignment of the sucking openings 22 to the groove 21 is shown in somewhat more detail in a sectional illustration in FIG. Above all, it is shown here that the top of the suction bar 20 is smooth and has transition contours that allow clean sheet guidance. It is essential that the sucking openings 22 have a diameter which is smaller than the width of the groove 21. This ensures that the weak radius of curvature of the two trailing edges of the groove 21 is retained over its entire length.
- FIG. 8 a top view of the suction bar 20 shows how the sucking openings 22 are arranged in the groove 21. The selected and displayed
- Leading edge of the groove 21 is provided.
- the distribution of the sucking openings 22 over the length of the groove 21 depends on the distribution of the negative pressure and is adjusted accordingly.
- the purpose of arranging a separate squeegee 20 is as follows: after a long period of operation, it is possible to replace the squeegee 20 on the sheet brake 5 easily by replacing it with a new squeegee 20 if wear has occurred inevitably. Therefore, the entire sheet brake 5 does not have to be revised or even replaced.
- the function of the sheet brake 5 is as follows:
- the printed sheet 1 is guided on the chain conveyor system 2 from the printing press to the delivery stack 3. After the gripper systems have passed, the printed sheet 1 is detected and guided by means of the sheet catching device 6. At the same time, the printed sheet 1 runs past the sheet brake 5, which is raised synchronously with the sheet movement by the drive 15 via the crank 9 and thereby detects the printed sheet 1 by suction against the suction bar 20. Because of the special selected distribution of the sucking openings 22 over the entire width of the sheet brake 5, the vacuum 21 is the same everywhere in the groove 21. This leads to the fact that the printed sheet 1 is sucked a little into this groove (see FIG. 7). A weak, groove-shaped deformation is thus formed over the entire width of the printed sheet 1.
- This weak deformation is sufficient to stabilize the printed sheet 1 in the lateral direction and to keep it in the extended position and at the same time to exert a high deceleration due to frictional engagement on the printed sheet 1. While the printed sheet 1 is guided downward to the surface of the delivery stack 3 in the course of its forward movement by the synchronously running lifting movement of the sheet brake 5, it is held at any time with a defined force. This means that neither the corners nor the rear edge of the printing sheet 1 can tip over and thus hinder the following printing sheet 1.
- the sheet brake 5 shown has a particularly advantageous effect in connection with so-called re-grippers 23. These are arranged in the region of the front edge 24 of the delivery stack 3 and take over the printed sheet 1 after it has been released by the chain conveyor system 2.
- the take-off grippers 23 execute a movement which moves back and forth in the sheet cycle and in the sheet running direction R. They take over the printed sheet 1 from the chain conveyor system 2 and guide it with decreasing speed onto the surface of the delivery stack 3 and to its front edge 24. Due to the controlled movement of such take-off grippers 23, the deposition of the printed sheet 1 in connection with the sheet brake 5 is virtually in positive guidance and always possible in the same defined states.
- the special advantage of the groove 21 in the suction bar 20 is shown.
- the removal grippers 23 act only selectively on the printed sheets, it can happen, particularly with lighter printing substrates, that a printed sheet 1 is distorted when the sheet brake 5 is pulled off .
- the effect is that the printed sheet 1 slides together at its rear edge transversely to the sheet running direction R and forms waves or folds in the sheet running direction R.
- This disadvantage is avoided by the elongated guidance by means of the groove 21.
- the take-off gripper 23 can thus be used in cooperation with the sheet brake 5 without problems with delivery and at all speeds.
- the function of the sheet brake 5 coordinated in the sheet travel is as follows:
- a printed sheet 1 arriving at the chain conveyor 2 is picked up by the sheet catching device 25 and tightened in the sheet path.
- the sheet brake 5 has reached its highest point and detects the printed sheet 1. It is sucked in and is guided downwards in a sinusoidal motion during the forward movement. The fastest downward movement is only achieved when the rear edge of the printed sheet 1 has overflowed the sheet catching device 25. It is thus ensured that the sheet brake 5 does not place the trailing edge of the printing sheet 1 on the sheet catching device 25 during its downward movement and the printing sheet 1 is possibly lifted off the sheet brake 5.
- the printed sheet 1 is transferred to the take-off gripper 23, which guides it to the front edge stops on the delivery stack 3. During this time, the printed sheet 1 is lowered further and further onto the stack surface by the sheet brake 5 and is held laterally stretched under the action of the suction into the groove 21.
- the chamber 18 in FIG. 6 can also be provided with a negative pressure and generate an additional braking surface via the top of the mousing openings.
- This auxiliary measure is used in the event that heavy materials have to be processed.
- FIG. 9 Another resulting alternative solution in a simplified form is shown in FIG. 9.
- the chamber 18 can also be subjected to negative pressure.
- FIG. 9 there are provided at the top of the chamber 18 sucking openings 26 which, through their action on the printed sheet 1, increase the holding area of the sheet brake 5.
- a suction air supply 27 is attached to the chamber 18.
- the second chamber 18 provided on the sheet brake 5 instead of the sheet catching device 25 for bringing the printed sheet to the sheet brake 5.
- the suction air inlets 17 and 27 are advantageous independently adjustable. As a result, the catching and braking effect can be set in a targeted manner and matched to each substrate and each print subject.
- the shape of the sheet brake 5 and, in particular, the suction bar 20 and the coordination of the movements ensure that the printed sheets 1 are guided cleanly and precisely to form an edge-accurate stack.
- Alternatives are also given with regard to the arrangement of a fixed and a stroke-controlled sheet brake 5 and their combination with a fixed or also stroke-controlled sheet catching device 25 or their design as a suction chamber 18.
- Another important function is the synchronization of the lifting movements with the sheet movement and their adaptation to the adjustment with different sheet formats, as described above.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96911914A EP0822914B1 (de) | 1995-05-03 | 1996-04-24 | Bogenbremse im ausleger einer druckmaschine |
US08/945,252 US5979701A (en) | 1995-05-03 | 1996-04-24 | Page brake in a printing machine fly |
DE59602398T DE59602398D1 (de) | 1995-05-03 | 1996-04-24 | Bogenbremse im ausleger einer druckmaschine |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19515725 | 1995-05-03 | ||
DE19614491A DE19614491C2 (de) | 1995-05-03 | 1996-04-12 | Bogenbremse im Ausleger einer Druckmaschine |
DE19515725.7 | 1996-04-12 | ||
DE19614491.4 | 1996-04-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996034820A1 true WO1996034820A1 (de) | 1996-11-07 |
Family
ID=26014723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/000714 WO1996034820A1 (de) | 1995-05-03 | 1996-04-24 | Bogenbremse im ausleger einer druckmaschine |
Country Status (6)
Country | Link |
---|---|
US (1) | US5979701A (de) |
EP (1) | EP0822914B1 (de) |
JP (1) | JP2871860B2 (de) |
AT (1) | ATE181896T1 (de) |
CZ (1) | CZ288420B6 (de) |
WO (1) | WO1996034820A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4676070B2 (ja) * | 2001-02-09 | 2011-04-27 | 株式会社小森コーポレーション | 枚葉印刷機 |
DE10224299B4 (de) | 2001-07-27 | 2023-06-07 | Heidelberger Druckmaschinen Ag | Ausleger einer flächige Bedruckstoffe verarbeitenden Maschine |
BR102015024953A2 (pt) * | 2014-10-01 | 2016-04-12 | Müller Martini Holding AG | freio para folha de impressão |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2106199A (en) * | 1932-08-31 | 1938-01-25 | Faber & Schleicher A G | Sheet delivery device and method |
US3933351A (en) * | 1973-11-22 | 1976-01-20 | Roland Offsetmaschinenfabrik Faber & Schleicher Ag | Sheet delivery arrangement having an air-stream sheet retarder |
DE2720674A1 (de) * | 1977-05-07 | 1978-11-09 | Maschf Augsburg Nuernberg Ag | Bogenauslegevorrichtung fuer eine rotations-druckmaschine |
CH611579A5 (en) * | 1976-05-14 | 1979-06-15 | Walter Hostettler | Auxiliary device, serving for flattening out paper sheets, on a paper sheet-processing machine |
DE8003052U1 (de) * | 1980-02-06 | 1980-05-08 | M.A.N.-Roland Druckmaschinen Ag, 6050 Offenbach | Bogenauslegevorrichtung |
DE2908901A1 (de) * | 1979-03-07 | 1980-09-11 | Vacohub Transportanlagen Gmbh | Verfahren und vorrichtung zum kontinuierlichen stapeln von blechen o.dgl. foerdergut von unterschiedlicher dicke |
US4469321A (en) * | 1981-03-30 | 1984-09-04 | M.A.N.-Roland Druckmaschinen Aktiengesellschaft | Device for the delayed piling of sheets |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2752831A (en) * | 1953-03-17 | 1956-07-03 | Bruce Dohrmann | Tag patching and punching machine |
DE2707170C2 (de) * | 1977-02-18 | 1982-07-15 | Siemens AG, 1000 Berlin und 8000 München | Pneumatische Bremse für einen Aufzeichnungsträger |
SU716952A1 (ru) * | 1978-03-09 | 1980-02-25 | Всесоюзный Научно-Исследовательский Институт Полиграфического Машиностроения | Вакуумна рейка дл бокового равнени |
SU956398A1 (ru) * | 1980-01-25 | 1982-09-07 | Всесоюзный Научно-Исследовательский Институт Полиграфического Машиностроения | Вакуумное тормозное устройство дл листовых печатных машин |
US4591943A (en) * | 1983-05-26 | 1986-05-27 | Electro-Matic Products Co. | Apparatus for demagnetizing a chuck |
DD259389B5 (de) * | 1987-03-30 | 1993-11-18 | Kba Planeta Ag | Bogenleiteinrichtung in bogenauslagen |
DD281798A5 (de) * | 1988-12-27 | 1990-08-22 | Polygraph Leipzig | Bogenleit- und -bremseinrichtung in auslagen von druckmaschinen |
-
1996
- 1996-04-24 EP EP96911914A patent/EP0822914B1/de not_active Expired - Lifetime
- 1996-04-24 US US08/945,252 patent/US5979701A/en not_active Expired - Fee Related
- 1996-04-24 CZ CZ19973461A patent/CZ288420B6/cs not_active IP Right Cessation
- 1996-04-24 AT AT96911914T patent/ATE181896T1/de not_active IP Right Cessation
- 1996-04-24 WO PCT/DE1996/000714 patent/WO1996034820A1/de active IP Right Grant
- 1996-04-24 JP JP8532917A patent/JP2871860B2/ja not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2106199A (en) * | 1932-08-31 | 1938-01-25 | Faber & Schleicher A G | Sheet delivery device and method |
US3933351A (en) * | 1973-11-22 | 1976-01-20 | Roland Offsetmaschinenfabrik Faber & Schleicher Ag | Sheet delivery arrangement having an air-stream sheet retarder |
CH611579A5 (en) * | 1976-05-14 | 1979-06-15 | Walter Hostettler | Auxiliary device, serving for flattening out paper sheets, on a paper sheet-processing machine |
DE2720674A1 (de) * | 1977-05-07 | 1978-11-09 | Maschf Augsburg Nuernberg Ag | Bogenauslegevorrichtung fuer eine rotations-druckmaschine |
DE2908901A1 (de) * | 1979-03-07 | 1980-09-11 | Vacohub Transportanlagen Gmbh | Verfahren und vorrichtung zum kontinuierlichen stapeln von blechen o.dgl. foerdergut von unterschiedlicher dicke |
DE8003052U1 (de) * | 1980-02-06 | 1980-05-08 | M.A.N.-Roland Druckmaschinen Ag, 6050 Offenbach | Bogenauslegevorrichtung |
US4469321A (en) * | 1981-03-30 | 1984-09-04 | M.A.N.-Roland Druckmaschinen Aktiengesellschaft | Device for the delayed piling of sheets |
Also Published As
Publication number | Publication date |
---|---|
EP0822914A1 (de) | 1998-02-11 |
CZ288420B6 (en) | 2001-06-13 |
JP2871860B2 (ja) | 1999-03-17 |
JPH10510504A (ja) | 1998-10-13 |
EP0822914B1 (de) | 1999-07-07 |
ATE181896T1 (de) | 1999-07-15 |
CZ346197A3 (cs) | 1998-02-18 |
US5979701A (en) | 1999-11-09 |
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