US3902677A - Support arrangement for a web-carrying roller - Google Patents

Support arrangement for a web-carrying roller Download PDF

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Publication number
US3902677A
US3902677A US459355A US45935574A US3902677A US 3902677 A US3902677 A US 3902677A US 459355 A US459355 A US 459355A US 45935574 A US45935574 A US 45935574A US 3902677 A US3902677 A US 3902677A
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United States
Prior art keywords
spring
rollers
roller
arrangement
rotation
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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
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US459355A
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English (en)
Inventor
Robert Wolf
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JM Voith GmbH
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JM Voith GmbH
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H16/00—Unwinding, paying-out webs
    • B65H16/02—Supporting web roll
    • B65H16/08—Supporting web roll parallel rollers type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/02—Supporting web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/08—Web-winding mechanisms
    • B65H18/14—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web
    • B65H18/20—Mechanisms in which power is applied to web roll, e.g. to effect continuous advancement of web the web roll being supported on two parallel rollers at least one of which is driven
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/50—Vibrations; Oscillations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S242/00—Winding, tensioning, or guiding
    • Y10S242/907—Vibration creation or dampening

Definitions

  • the present invention relates generally to a support arrangement, and in particular to a support arrangement for a web-carrying roller, such as a paper-carrying roller or the like.
  • the invention is especially useful for a support arrangement in a paper machine winder, wherein two rollers carry a rewinding or unwinding roller for paper.
  • German allowed application No. 2,128,097 provides an arrangement in which especially the higherfrequency vibrations are absorbed by springs which mount one of the supporting rollers in a yieldable manner.
  • the two supporting rollers can be otherwise identical, but due to the presence of the springmounting of one of them they have differential inherent vibratory frequencies, so that a summation of the frequencies of the two rollers, and therefore a damaging lers yieldable with reference to the second roller.
  • the spring means have identical inherent spring characteristics but are arranged asymmetrically with reference to a vertical plane passing throughthe longitudinal axis of the second roller, so that the spring effect afforded by the respective spring means differs despite the identical inherent spring characteristics thereof.
  • the vibrations which develop during operation of the arrangement act on the spring arrangements on lines extending through the center of the web-carrying roll, and the center of the respective supporting roller.
  • the vibrations will act on the respective spring arrangements at different angles and at different points, so that different resilience in the spring arrangements is obtained without requiring different or adjustable configurations for the supporting roller springs, their mounts of the web-carrying rollers, is precluded.
  • the arrangement is not inherently suitable for negating the lowerfrequency vibrations which develop, but could be modified to achieve this purpose.
  • both of the rollers would have to be spring mounted, and the resilients of the springs of one of the rollers of the supporting rollers would have to be set at a value different from that of the springs supporting the other roller.
  • This would require a relatively complicated construction, rendering the arrangement rather expensive.
  • one feature of the invention resides, in an arrangement of the character described, in a pair of first rollers mounted for rotation about respective substantially parallel and horizontal longitudinal axes, and a second roller extending along and supported on the first rollers, for rotation about its own longitudinal axis.
  • First and second spring means are provided, each mounting one of the first rolor the supporting rollers themselves.
  • the springs of the spring arrangements may be leaf springs which may be clampingly mounted on appropriate supports, the points of such mounting being horizontally and vertically offset with respect ot the axis of rotation of the associated supporting roller, but in both instances (with respect to both rollers) toward one and the same side.
  • the shaft ends of the supporting rollers may be connectedto pivotably mounted arm, each arm being supported by a spring, and the pivot mounts for these arms being offset both vertically and horizontally with reference to the axis of rotation of the respectively associated supporting roller.
  • the line of vibratory action extending through the axis of rotation. of the respective supporting roller acts on the lever arm of the one supporting roller at a considerable distance from the pivot point of in the longitudinal direction of the supporting rollers, and the general plane of which forms an acute angle with a horizontal plane, the angle of both such springs opening toward one and the same side.
  • FIG. 1 is a diagrammatic illustration of one embodiment of the invention
  • FIG. 2 is a view analogous to FIG. 1, illustrating a second embodiment of the invention
  • FIG. 3 is a view analogous to FIG. 1, illustrating a third embodiment of the invention.
  • FIG. 4 is a further diagrammatic illustration, illustrating a fourth embodiment of the invention.
  • reference numeral 1 identifies a web-carrying roll, that is a roll on which a paper web or another type of web can be wound and/or from which it can be unwound.
  • the roll 1 rests on and is supported by two supporting rollers 2, 3 at least one of which can be driven in rotation in a manner not illustrated but well known per se in the art.
  • the rollers 2 and 3 have shafts 2a, 3a extending along their respective axis of rotation, and the opposite ends of these shafts are supported by leaf spring 4 is associated with the roller 2 and leaf spring 5 with the roller 3.
  • each leaf spring 4, 5 forms with a horizontal plane an angle which may be different from the two supporting rollers 2, 3, but which will always be larger than and smaller than 90"; both angles are open to one and the same side.
  • vibrations which may develop when the roll 1 rotates will act with practically identical intensity along the lines A and B which pass through the center of the roll 1 and through the axes of rotation of the respective support rollers 2 and 3. Since the leaf spring associated with the roller 3 has its broad side exposed to the vibrations acting upon the line B, the spring 5 will offer a springy resilience which is dictated by its thickness. On the other hand, since the leaf spring 4 associated with the supporting roller 2 has essentially its narrow side exposed to the vibrations acting along the line A, the spring 4 will offer only that resilience which corresponds to its transverse width which is evidently substantially greater greater than its thickness. In other words, the action of the spring 4 will be considerably stiffer than that of the spring 5.
  • the springs 4 and 5 are identical in design and arrangement, but yet despite this identity of structure and inherent spring characteristic they will counteract the identical vibrations acting on them, with different opposing spring forces of different resilience.
  • FIG. 2 like reference numerals identify like components as in FIG. 1, which is indeed the case in all other disclosed embodiments.
  • two leaf springs 14 and 15 are provided which support the supporting rollers 2 and 3, respectively, and which extend in the longitudinal direction of these rollers.
  • the springs 14 and 15 are so arranged that their general planes are at least approximately horizontal.
  • the mounting members 16 and 17 which engage marginal edge portions of the springs 14 and 15 are offset from the axis of rotation of the respectively associated supporting roller 2, 3. They are offset both vertically and horizontally, and the horizontal offset is in one and the same direction, that is towards the right in FIG. 2 with respect to the axis of rotation.
  • the vibratory forces acting along lines A and B intersect the leaf spring 14 and 15 in the points A and B, respectively.
  • the spring characteristics that is the resilience developed by the respective springs will depend upon the difference between the points A and B and the clamping members 16 and 17, respectively.
  • this distance substantially differs in the case of the two leaf springs, in that it is substantially greater in the case of the leaf spring 14 than in the case of the leaf spring 15.
  • the springs 14 and 15 and thereby the supporting rollers 2 and 3 carried by them will also develop different degrees of resilience with respect to these vibrations.
  • FIG. 3 shows an embodiment which also incorporates leaf springs, here designated with reference numerals 24 and 25 and extending in longitudinal direction of the supporting rollers 2 and 3.
  • the general planes of the leaf springs 24 and 25 form acute angles with a horizontal plane, as shown. These angles are again both open to one and the same side, namely towards the right in FIG. 3.
  • Marginal edge portions 24a and 25a of the springs 24 and 25 are mounted in a support S, for instance a machine base or the like, and the rollers 2 and 3 are again carried by the springs 24 and 25, respectively.
  • the spring 25 willoppose the vibrations developing as a result of the rotation of the roll 1 by developing a resilience which is determined by the thickness of the spring 25, whereas the resilience opposed by the spring 24 in respect to these vibrations is detemined substantially by the transverse width of the spring 24, in view of the fact that the lines A and B act upon the springs 24 and 25 in entirely different manners.
  • the angle included between the springs 24, 25 and the support S is designated with the symbol a.
  • the resilience of the spring 24 will be extremely stiff as compared to the resilience offered by the spring 25.
  • each of the rollers will have two such arms, one at each end, but only one arm has been shown for each roller.
  • the arms 30 and 31 are mounted on pivot mounts 32 and 33, respectively, and these mounts 32 and 33 are horizontally and vertically offset with respect to the axis of rotation of the associated roller 2, 3.
  • each of the arms 30, 31 is supported by a coil spring 34 and 35, and of course, more than one could be used.
  • This embodiment corresponds to the operational effect obtained in the embodiment of FIG. 2, as the vibrations acting along the line A will act upon the spring 34 with a lever arm corresponding to the distance between point A at which they intersect the spring and the pivot mount 32.
  • the vibrations acting upon line B will act upon the spring 35 with a different lever arm, namely that corresponding to the distance between point B and pivot mount 33.
  • the springs may also be arranged exactly below the axis of rotation of the respective rollers 2 and 3, and in lieu of the helical compression springs which are shown in the drawing it is also possible to use helical tension springs acting upon the arms 30, 31, to use leaf springs, rubber springs or dished springs.
  • the essential point of the invention is that the invention makes it possible to use spring arrangements for both rollers 2, 3 which are identical or nearly identical as to their structure and which are identical as to their spring characteristics that are inherent in them, but nevertheless to obtain different resilience and therefore different damping of the vibrations acting upon them.
  • This makes it possible to avoid the disadvantages associated with priorart arrangements of this type, namely supporting arrangements for web-carrying rollers, but to do this with very simple constructions, and in fact with constructions which are even more simplified and more economical because the spring arrangements for both rollers 2, 3 can be identical and therefore be produced at less cost than would otherwise be possible.
  • An arrangement of the character described comprising a pair of first rollers mounted for rotation about respective substantially parallel and horizontal longitudinal axes; a second roller extending along and supported on said first rollers for rotation about its own longitudinal axis; and first and second spring means each mounting one of said first rollers yieldable with reference to said second roller, said spring means having identical inherent spring characteristics but being arranged asymmetrically with reference to a vertical plane passing through said longitudinal axis of said second roller, so that the spring effect afforded by the respective spring means differs despite said identical inherent spring characteristics.
  • said spring means comprising respective leaf springs each extending longitudinally of one of said first rollers and having a marginal portion fixedly connected to a support, said marginal portions each being offset vertically from the axis of rotation of the associated first roller and both being offset longitudinally in one and the same direction from the same axes of rotation.
  • each spring means comprises an arm having an end which carries one of said bearings, a pivot mounting said arm for pivotal movement and being vertically and horizontally offset from the axis of rotation of the associated first roller, and a spring element engaging the respective arm and resisting such pivotal movement thereof.
  • said spring means comprise respective leaf springs extending substantially longitudinally of said first rollers and each having a major surface which includes an acute angle with the horizontal, the angles included by the leafsprings of both spring means being open in one and the same direction.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Replacement Of Web Rolls (AREA)
  • Unwinding Webs (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Winding Of Webs (AREA)
US459355A 1973-04-12 1974-04-09 Support arrangement for a web-carrying roller Expired - Lifetime US3902677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2318351A DE2318351C2 (de) 1973-04-12 1973-04-12 Trageinrichtung für eine Wickelrolle

Publications (1)

Publication Number Publication Date
US3902677A true US3902677A (en) 1975-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US459355A Expired - Lifetime US3902677A (en) 1973-04-12 1974-04-09 Support arrangement for a web-carrying roller

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US (1) US3902677A (enrdf_load_html_response)
JP (1) JPS5243243B2 (enrdf_load_html_response)
AT (1) AT328856B (enrdf_load_html_response)
BE (1) BE812695A (enrdf_load_html_response)
BR (1) BR7402705D0 (enrdf_load_html_response)
DE (1) DE2318351C2 (enrdf_load_html_response)
ES (1) ES425139A1 (enrdf_load_html_response)
FI (1) FI57082C (enrdf_load_html_response)
FR (1) FR2236760B1 (enrdf_load_html_response)
GB (1) GB1447431A (enrdf_load_html_response)
IT (1) IT1005958B (enrdf_load_html_response)
NL (1) NL7404982A (enrdf_load_html_response)
SE (1) SE403607B (enrdf_load_html_response)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180216A (en) * 1978-04-12 1979-12-25 Beloit Corporation Winder with horizontal rider roll adjustment
US4313577A (en) * 1980-03-25 1982-02-02 Hauni-Werke Korber & Co. Kg Rotary support for rolls of convoluted webs and means for damping its natural frequency oscillations
US20020185567A1 (en) * 2001-05-23 2002-12-12 Jagenberg Papiertechnik Gmbh Process and device for active vibration damping for winding machines
WO2003074364A1 (en) * 2002-03-01 2003-09-12 Free-Flow Packaging International, Inc. Machine and method for inflating and sealing air-filled packing cushions
US6911117B1 (en) * 1997-04-30 2005-06-28 Metso Paper, Inc. Method and equipment for attenuation of oscillation in a paper machine or in a paper finishing device
US20050160699A1 (en) * 2004-01-27 2005-07-28 Andrew Perkins Method and apparatus for pre-tearing strings of air-filled packing materials and the like
US20050204700A1 (en) * 1999-09-22 2005-09-22 Greenwood John S Method and machine for the manufacture of air pillows
EP1764327A1 (de) * 2005-09-20 2007-03-21 Voith Patent GmbH Rollenwickeleinrichtung
EP1739040A3 (de) * 2005-06-29 2007-09-26 Voith Patent GmbH Wickelmaschine
US20090236465A1 (en) * 2006-06-12 2009-09-24 Metso Paper, Inc. Arrangement for Attenuating Vibration of a Roll Assembly
US20120000623A1 (en) * 2009-03-18 2012-01-05 Metso Paper, Inc. Roll Assembly for a Fiber-Web Machine and Method of Attenuating Vibration of a Fiber-Web Machine Roll
CN102935950A (zh) * 2011-08-16 2013-02-20 江苏省衣维新投资发展有限公司 一种退卷布方法
US8534524B2 (en) 2010-10-08 2013-09-17 Gtech Corporation Perforated ticket dispensing machine
US20150008276A1 (en) * 2012-03-07 2015-01-08 Siemens Vai Metals Technologies Gmbh Method and device for winding a material web
CN111115327A (zh) * 2019-12-25 2020-05-08 晋江圣翔机械有限公司 一种剖布机的出料控制系统
CN111547549A (zh) * 2020-05-08 2020-08-18 中国重型机械研究院股份公司 用于大径宽比带卷轴向上卸卷的防倾翻装置及上卸卷方法

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609086A1 (de) * 1986-03-18 1987-10-01 Wifag Maschf Vorrichtung zum be- bzw. entladen eines rollenstaenders einer rollenrotationsdruckmaschine mit bzw. von papierrollen
JPS62230549A (ja) * 1986-03-31 1987-10-09 Kuinraito Denshi Seiko Kk 合成樹脂シ−トの接合装置
DE3637634A1 (de) * 1986-11-05 1988-05-19 Schmidt Erwepa Maschf Verfahren und vorrichtung zum wickeln von materialbahnen zu wicklungen
RU2136572C1 (ru) * 1998-07-30 1999-09-10 Новосибирский технологический институт Московской государственной академии легкой промышленности Устройство для намотки длинномерных материалов на оправку
RU2240272C1 (ru) * 2003-07-04 2004-11-20 Афиногенов Юрий Алексеевич Устройство для намотки длинномерных материалов на оправку
DE102004000033A1 (de) * 2004-10-21 2006-04-27 Voith Paper Patent Gmbh Wickelmaschine
DE102005002030B4 (de) * 2005-01-15 2007-08-30 Koenig & Bauer Aktiengesellschaft Rollenwechsler zur Zuführung einer Materialbahn
DE102006043639A1 (de) 2006-09-18 2008-03-27 Voith Patent Gmbh Wickelmaschine
FI124595B (fi) * 2010-10-28 2014-10-31 Valmet Technologies Inc Kuiturainakoneen telantuentajärjestely ja kuiturainan pituusleikkurin osarainarullain
CN105460652A (zh) * 2015-12-25 2016-04-06 佛山市启达研磨器材科技有限公司 一种带自动纠偏功能的放卷装置
CN105458951B (zh) * 2015-12-25 2018-04-13 佛山市启达研磨器材科技有限公司 一种用于千页轮生产线上的砂带坯卷滚床机构

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239161A (en) * 1963-12-31 1966-03-08 Orville V Dutro Rollstand drive
US3306547A (en) * 1965-04-02 1967-02-28 Keelavite Hydraulics Ltd Winding apparatus
US3334834A (en) * 1965-05-14 1967-08-08 Curtis Marble Machine Co Rolling head
US3394897A (en) * 1966-10-24 1968-07-30 Cutters Machine Co Inc Suspended web roll support

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3239161A (en) * 1963-12-31 1966-03-08 Orville V Dutro Rollstand drive
US3306547A (en) * 1965-04-02 1967-02-28 Keelavite Hydraulics Ltd Winding apparatus
US3334834A (en) * 1965-05-14 1967-08-08 Curtis Marble Machine Co Rolling head
US3394897A (en) * 1966-10-24 1968-07-30 Cutters Machine Co Inc Suspended web roll support

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180216A (en) * 1978-04-12 1979-12-25 Beloit Corporation Winder with horizontal rider roll adjustment
US4313577A (en) * 1980-03-25 1982-02-02 Hauni-Werke Korber & Co. Kg Rotary support for rolls of convoluted webs and means for damping its natural frequency oscillations
US6911117B1 (en) * 1997-04-30 2005-06-28 Metso Paper, Inc. Method and equipment for attenuation of oscillation in a paper machine or in a paper finishing device
US8627637B2 (en) 1999-09-22 2014-01-14 Pregis Innovative Packaging, Inc. Method and machine for the manufacture of air pillows
US20050204700A1 (en) * 1999-09-22 2005-09-22 Greenwood John S Method and machine for the manufacture of air pillows
US20020185567A1 (en) * 2001-05-23 2002-12-12 Jagenberg Papiertechnik Gmbh Process and device for active vibration damping for winding machines
US7588208B2 (en) * 2001-05-23 2009-09-15 Voith Patent Gmbh Process and device for active vibration damping for winding machines
WO2003074364A1 (en) * 2002-03-01 2003-09-12 Free-Flow Packaging International, Inc. Machine and method for inflating and sealing air-filled packing cushions
US20060112663A1 (en) * 2002-03-01 2006-06-01 Free Flow Packaging International, Inc. Machine And Method For Inflating And Sealing Air Filled Packing Cushions
US7150136B2 (en) 2002-03-01 2006-12-19 Free-Flow Packaging International Inc. Machine and method for inflating and sealing air filled packing cushions
US7174696B2 (en) * 2002-03-01 2007-02-13 Free-Flow Packaging International, Inc. Machine and method for inflating and sealing air-filled packing cushions
CN1639009B (zh) * 2002-03-01 2012-02-08 福利弗罗包装国际有限公司 用于充气和密封充气包装垫的机器和方法
US7343723B2 (en) 2004-01-27 2008-03-18 Free-Flow Packaging International, Inc. Method and apparatus for pre-tearing strings of air-filled packing materials and the like
US20050160699A1 (en) * 2004-01-27 2005-07-28 Andrew Perkins Method and apparatus for pre-tearing strings of air-filled packing materials and the like
EP1739040A3 (de) * 2005-06-29 2007-09-26 Voith Patent GmbH Wickelmaschine
EP1764327A1 (de) * 2005-09-20 2007-03-21 Voith Patent GmbH Rollenwickeleinrichtung
US20090236465A1 (en) * 2006-06-12 2009-09-24 Metso Paper, Inc. Arrangement for Attenuating Vibration of a Roll Assembly
US7967236B2 (en) * 2006-06-12 2011-06-28 Metso Paper, Inc. Arrangement for attenuating vibration of a roll assembly
US20120000623A1 (en) * 2009-03-18 2012-01-05 Metso Paper, Inc. Roll Assembly for a Fiber-Web Machine and Method of Attenuating Vibration of a Fiber-Web Machine Roll
US8372245B2 (en) * 2009-03-18 2013-02-12 Metso Paper, Inc. Roll assembly for a fiber-web machine and method of attenuating vibration of a fiber-web machine roll
US8534524B2 (en) 2010-10-08 2013-09-17 Gtech Corporation Perforated ticket dispensing machine
CN102935950A (zh) * 2011-08-16 2013-02-20 江苏省衣维新投资发展有限公司 一种退卷布方法
US20150008276A1 (en) * 2012-03-07 2015-01-08 Siemens Vai Metals Technologies Gmbh Method and device for winding a material web
US9796010B2 (en) * 2012-03-07 2017-10-24 Primetals Technologies Austria GmbH Method and device for winding a material web
CN111115327A (zh) * 2019-12-25 2020-05-08 晋江圣翔机械有限公司 一种剖布机的出料控制系统
CN111115327B (zh) * 2019-12-25 2021-07-27 晋江圣翔机械有限公司 一种剖布机的出料控制系统
CN111547549A (zh) * 2020-05-08 2020-08-18 中国重型机械研究院股份公司 用于大径宽比带卷轴向上卸卷的防倾翻装置及上卸卷方法

Also Published As

Publication number Publication date
IT1005958B (it) 1976-09-30
FR2236760B1 (enrdf_load_html_response) 1977-10-21
ES425139A1 (es) 1976-06-16
FI57082B (fi) 1980-02-29
AT328856B (de) 1976-04-12
FR2236760A1 (enrdf_load_html_response) 1975-02-07
NL7404982A (enrdf_load_html_response) 1974-10-15
DE2318351B1 (de) 1974-07-25
ATA177974A (de) 1975-06-15
JPS505607A (enrdf_load_html_response) 1975-01-21
JPS5243243B2 (enrdf_load_html_response) 1977-10-29
FI57082C (fi) 1980-06-10
BR7402705D0 (pt) 1974-10-08
BE812695A (fr) 1974-07-15
DE2318351C2 (de) 1975-03-20
SE403607B (sv) 1978-08-28
GB1447431A (en) 1976-08-25

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