US3367098A - Method and apparatus for exchanging tubes on textile machines - Google Patents

Method and apparatus for exchanging tubes on textile machines Download PDF

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Publication number
US3367098A
US3367098A US514574A US51457465A US3367098A US 3367098 A US3367098 A US 3367098A US 514574 A US514574 A US 514574A US 51457465 A US51457465 A US 51457465A US 3367098 A US3367098 A US 3367098A
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United States
Prior art keywords
tube
pressure
bag
bobbin
gripping device
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
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US514574A
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English (en)
Inventor
Schulz Gunter
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.)
Oerlikon Textile GmbH and Co KG
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Zinser Textilmaschinen GmbH
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/02—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for removing completed take-up packages and replacing by bobbins, cores, or receptacles at take-up stations; Transferring material between adjacent full and empty take-up elements
    • D01H9/04—Doffing arrangements integral with spinning or twisting machines
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
    • D01H9/001—Bobbin-taking arrangements
    • D01H9/003—Graspers operating under the action of a fluid

Definitions

  • the present invention relates in general to means for removing bobbins wound on tubes mounted on rotatable spindles or textiles machines such as spinning or twisting machines having winding means and their replacement by empty tubes for the winding of additional bobbins.
  • the invention is more particularly related to gripping devices for engaging the tubes upon which the bobbins are wound and also the empty tubes which are to replace the full bobbins in such a way as to greatly facilitate the removal and conveyance of these tubes and to a method of operation thereof.
  • the present invention consists of an improved bobbin tube gripping device which may, for example, be utilized with the apparatus disclosed in the above mentioned copending application.
  • gripper constructions for use in acquiring, conveying and releasing bobbin tubes on textile machines are of generally complicated construction and are capable of exerting only relatively small clamping forces upon the bobbin tube, which forces are very often insuflicient to properly effect a removal of the full bobbin tubes due to their size and weight.
  • Such grippers have taken the form of expandable members actuated by electromagnetically controlled linkages.
  • the gripper element be provided as a cylinder made from elastic material and capable of being expanded by the introduction of hydraulic or pneumatic pressure into the interior thereof.
  • the gripper element in this manner, by introduction of the gripper element at least partially into the open end of the bobbin tube and subsequent application of pressure thereto, the gripper element will undergo a transverse ice expansion within the bobbin tube until a firm clamping between tube and element is effected.
  • the gripper element in accordance with the instant invention comprises an axial pressure portion having a pressure surface which is adapted to exert an axial pressure on the spindle or bobbin tube support member. Due to this axial pressure supplied by the gripper element, the bobbin tube may be removed from the tube carrier in such a way that the transverse pressure supplied by the gripper element need only compensate for the net weight of the bobbin tube. In this way, the unnecessarily high pressure forces heretofore required to insure proper gripping of the gripper element with the inside bobbin tube surface can be eliminated without danger of inadvertent release of the bobbin tube by the gripper element prior to its actual removal to the bobbin conveyor or carrier.
  • FIGURE 1 is a partial cross-sectional view through one embodiment of a gripping device according to the present invention during initial operation wherein the gripping device is inserted into the open end of the bobbin tube;
  • FIGURE 2 is a partial cross-sectional view similar to FIGURE 1 showing the gripping device fully inserted into the end of the bobbin tube;
  • FIGURE 3 is a partial cross-sectional view similar to FIGURE 1 wherein the gripping device is fully inserted into the open end of the bobbin tube and has been expanded in accordance with the instant invention to firmly contact the bobbin tube;
  • FIGURE 4 is a partial cross-sectional view similar to that of FIGURE 1 wherein the manner in which axial pressure is applied to the bobbin tube support by the gripping device is illustrated.
  • FIGURES 1-4 illustrate a gripper element according to the present invention in four different working positions thereof.
  • a gripper support 40 which carries a plurality of like gripper elements is carried by a control slide and support assembly of an automatic tube exchanging device, such as described in the aforementioned copending patent application of Giinter Schulz and Wolfgang Igel.
  • the gripper elements in accordance with the instant invention comprise a plug 108 provided with a threaded end portion 111 which engages in a suitable aperture in a slide member 54, forming part of the support assembly of the tube exchanging apparatus, and capable of movement along the length of support 40 by suitable means (not shown).
  • the plug 108 is provided with an axial through-aperture 110 which communicates with an interior chamber 100 of the slide 54.
  • an elastic bag 106 Secured to the other end of the plug 108 in a fluidtight manner, for example, by glueing, opposite the threaded end 111 is an elastic bag 106, which is made of a suitable resilient material, preferably plastic or rubber.
  • the bag 106 is mounted over a reduced portion of the plug 108 and is then permanently secured in place by a ring 125 which serves as a clamping ring and also is provided with a collar 9 which serves as a reference surface outside of the bag for determining the lower edge of the plug 108.
  • the elastic bag 106 is provided with two surface por tions which perform diverse tasks in the acquisition and removal of full bobbin tubes from the spindles of the spinning or twisting machine.
  • the bag is first provided with a cylindrical expandable part 140 which forms a transverse pressure member capable of engaging with the inner surface of the bobbin tube at the open end thereof thereby gripping the tube sufliciently to support the weight thereof for transporting it from the spindle to a conveyor for further removal.
  • the bag is also provided with a conically shaped end part 141 which serves, in the manner to be described more completely hereinafter, as a means of exerting axial pressure on the spindle itself, so as to aid in the removal of the full bobbin tube from the spindle.
  • FIGURES l4 there is illustrated in conjunction with the gripping device of the instant invention, a textile spindle 14 upon which is positioned a conventional bobbin tube 53 having a full bobbin of yarn 101 wound thereon.
  • the diameter of the bag 106 as clearly evident from FIGURE 1, is dimensioned slightly smaller than the inside diameter of the standard bobbin tube 58 in accordance with the preferred embodiment of the invention; however, the bag diameter may also be slightly larger than the diameter of the tube provided that in the unpressurized condition the bag may still be inserted into the end of the bobbin tube Without considerable difficulty.
  • the inside space 122 of the bag 106 is connected by way of the through-aperture 110 in the plug 108 with the inner recess or duct 100 in the slide 54, and compressed air is preferably provided as a pressure medium for expanding the bag 106 by way of this duct 100.
  • compressed air is preferably provided as a pressure medium for expanding the bag 106 by way of this duct 100.
  • any other pressure fluid for example, hydraulic fluid, may also be used instead of compressed air without departing from the spirit and scope of the instant invention.
  • the means for producing, admitting and controlling the degree of pressure fluid which is applied via the duct 100 to the bag 106 is of conventional form and need not be described or illustrated herein to provide a clear understanding of the invention.
  • the gripping element is inserted into the open end of the tube 58 carrying a completed bobbin 101, that is to say, into the space above the top of the textile spindle 14 within the hollow interior or the tube 58.
  • the bag is inserted until the collar 109 abuts the top of the tube 58, as shown in FIG. 2, so that the end face 131 of the bag is pushed inwardly somewhat by the conical end 103. of the spindle 14.
  • FIG. 2 for removing a bobbin tube, the gripping element is inserted into the open end of the tube 58 carrying a completed bobbin 101, that is to say, into the space above the top of the textile spindle 14 within the hollow interior or the tube 58.
  • the bag is inserted until the collar 109 abuts the top of the tube 58, as shown in FIG. 2, so that the end face 131 of the bag is pushed inwardly somewhat by the conical end 103. of the spindle 14.
  • FIG. 2 for removing a
  • the lateral portion of the bag 140 is caused to expand against the bore of the tube 58 until a suflicient gripping pressure is produced between the bag and the interior surface of the tube 58 to permit the gripping device to support the weight of the tube and full bobbin.
  • the pressure within the bag causes the end face 141 to exert a pressure on the top of the spindle thereby effecting an axial thrust between the gripping device and the stationary spindle 14 to cause the tube 58 with the full bobbin 101 thereon to be drawn upwards off of the spindle.
  • the support slide 54 By then moving the support slide 54 upwardly, the tube may be entirely removed from the spindle. In disposing of the tube, a removal of the fluid pressure will produce a release of clamping action.
  • the transverse force provided by the gripping device and the axial pressure provided thereby are produced simultaneously, but due to the construction of the gripping device, the axial pressure will reach an effective level only after the transverse pressure has reached a level necessary to produce firm clamping.
  • the action of the gripping device is effected in a sequence of steps which insures that the lifting of the bobbin tube from the spindle is not initiated until a proper gripping is effected between the outer surface of the bag and the inner surface of the bobbin tube.
  • the lateral portion of the bag can be provided with a roughened outer surface.
  • the outer Wall of this portion of the sack can be made more elastic than the end portion 131 so that the inside of the tube 58 is gripped more quickly.
  • the bottom of wall portion 131 of the bag can be made somewhat thicker than the Wall part 140.
  • the insertion of empty tubes over the spindles from which full bobbin tubes have been removed may also be carried out in accordance with the present invention by the same gripping device which has served for the removing of the bobbin tube.
  • the empty tube may initially be guided by means of the gripping element axially over the spindle and may then be dropped down onto the spindle by a release of pressure applied to the pressure element.
  • the pressure element is inserted only partially into the end of the bobbin tube and is once again expanded so that the walls of the bag between the extreme end of the bobbin tube 58 and the surface defined by the collar 109 and plug 108 bulge outwardly about the end of the tube 58 and form an expanding surface which will symmetrically seat the empty tube onto the spindle.
  • This action of the bag upon only partial insertion thereof into the end of the bobbin tube is illustrated in phantom line at 106' effects, in this connection, a uniform seating of each of the tubes upon the plurality of spindles provided on the spinning or twisting machine.
  • the insertion of the empty spindle tubes and proper seating thereof can be effected by dropping the tubes loosely over the spindles by releasing pressure in the gripping device and then lowering the gripping device in its deflated condition so that the collar 109 contacts the upper edge of the tube and serves as a means for firmly pressing the tube upon the spindle into a firmly seated position.
  • a rigid or at least partially rigid construction of the end wall of the axial pressure element 141 for transmitting the axial pressure may be provided and, respectively, a rigid disc not shown may be inserted into this wall to facilitate this operation.
  • a gripping device for the acquisition and release of bobbin tubes mounted on spindles of a textile machine such as spinning or twisting machines comprising:
  • At least one expandable pressure element supported in position for insertion into an end of said bobbin tube mounted on said spindle of said textile machine
  • supply means associated with said support means for selectively supplying pressure fluid to said pressure element.
  • a gripping device as defined in claim 7 wherein said means for applying pressure to the end of said tube is provided as a collar surrounding said elastic bag.
  • a gripping device for the acquisition and release of bobbin tubes mounted on spindles of textile machines such as spinning or twisting machines, said gripping device including an elastic bag capable of expansion upon application of pressure fluid to the interior thereof, said bag being dimensioned slightly smaller than the bore of said bobbin tubes, the steps for firmly seating the bobbin tube on said spindle comprising inserting said bag only partially into the bore of said tube,
  • a gripping device for the acquisition and release of bobbin tubes mounted on spindles of a winding machine, said gripping device including an elastic bag capable of expansion upon application of pressure fiuid to the interior thereof, the side walls of said bag being more resilient than the end wall thereof, the steps for removing the bobbin tube from a spindle comprising inserting said bag completely into the bore of said tube until the end wall thereof is deformed inwardly by the spindle,
  • a gripping device for the acquisition and release of bobbin tubes mounted on spindles of a textile machine such as spinning or twisting machines comprising:
  • an expandable pressure element capable of being inserted into an end of a bobbin tube provided as a bag-like member having one open end, side walls and an end wall,
  • a plug member secured in a fluid-type manner to said bag-like pressure element to form a closure for the open end thereof and having a through-aperture for permitting the application of fluid pressure to the inside of said element
  • the elasticity of the side walls of said pressure element being greater than the elasticity of the end wall thereof.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Unwinding Of Filamentary Materials (AREA)
  • Manipulator (AREA)
US514574A 1964-12-19 1965-12-17 Method and apparatus for exchanging tubes on textile machines Expired - Lifetime US3367098A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1964Z0011239 DE1282526C2 (de) 1964-12-19 1964-12-19 Pneumatischer Greifer zum Erfassen von Spulen bzw. Huelsen an Spulenwechselvorrichtungen
DEZ11245A DE1292563B (de) 1964-12-19 1964-12-23 Vorrichtung zum selbsttaetigen Spulenwechsel an Spinn- und Zwirnmaschinen

Publications (1)

Publication Number Publication Date
US3367098A true US3367098A (en) 1968-02-06

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
US514574A Expired - Lifetime US3367098A (en) 1964-12-19 1965-12-17 Method and apparatus for exchanging tubes on textile machines
US514575A Expired - Lifetime US3370411A (en) 1964-12-19 1965-12-17 Method and apparatus for replacing bobbin tubes on spinning or twisting machinery

Family Applications After (1)

Application Number Title Priority Date Filing Date
US514575A Expired - Lifetime US3370411A (en) 1964-12-19 1965-12-17 Method and apparatus for replacing bobbin tubes on spinning or twisting machinery

Country Status (11)

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US (2) US3367098A (es)
AT (1) AT296100B (es)
BE (1) BE673455A (es)
CH (2) CH473914A (es)
CS (2) CS157618B2 (es)
DE (2) DE1282526C2 (es)
ES (2) ES329235A1 (es)
FR (1) FR1455716A (es)
GB (2) GB1131248A (es)
NL (1) NL145291B (es)
SE (1) SE316107B (es)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462934A (en) * 1967-04-11 1969-08-26 Zinser Textilmaschinen Gmbh Apparatus for gripping bobbins on textile machines
US3667204A (en) * 1969-12-18 1972-06-06 Rieter Ag Maschf Apparatus for conjointly doffing and donning a plurality of bobbins or tubes placed on spindles of ring spinning and ring twisting machines
US3714770A (en) * 1969-11-07 1973-02-06 Zinser Textilmaschinen Gmbh Inflatable gripper for handling spools of textile machines
US3743211A (en) * 1972-06-19 1973-07-03 Murata Machinery Ltd Pneumatic bobbin hanger
US3791125A (en) * 1971-05-10 1974-02-12 Nippon Keori Co Ltd Spinning machine yarn package tube exchanging device
US3808788A (en) * 1972-03-16 1974-05-07 Nuova San Giorgio Spa Grasping device for doffing full bobbins and reloading empty tubes in a spinning frame
US3835633A (en) * 1973-04-30 1974-09-17 Zinser Textilmaschinen Gmbh Gripper for yarn carriers and the like
US3844099A (en) * 1972-09-13 1974-10-29 Toray Industries Method and apparatus for doffing full bobbins on textile machines such as draw-twister
US3892437A (en) * 1973-02-09 1975-07-01 Finnlines Ltd Oy Center hoisting device
US4341067A (en) * 1979-02-10 1982-07-27 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Bobbin holding device in a doffing apparatus
US4365766A (en) * 1980-08-04 1982-12-28 Washington Instrument, Inc. Bobbin locking device
US4438623A (en) * 1980-11-13 1984-03-27 Rieter Machine Works Ltd. Gripper apparatus on a ring spinning or ring twisting machine
US4445323A (en) * 1981-10-29 1984-05-01 Rieter Machine Works Limited Apparatus for the conjoint gripping of bobbins on a ring spinning or ring-twisting machine
US5875984A (en) * 1997-02-08 1999-03-02 Zinser Textilmaschinen Gmbh Hanger assembly for roving bobbins and core tubes

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791123A (en) * 1970-11-27 1974-02-12 Toyoda Automatic Loom Works Method and apparatus for replacing bobbins on spinning or twisting machines
US3823537A (en) * 1970-12-28 1974-07-16 Sumida Ku And Kisshoin Ochiaic Automatic doffing process and apparatus for textile machines
US3786621A (en) * 1971-10-13 1974-01-22 Maremont Corp Grasper bar positioning mechanism for automatic doffer
US3793818A (en) * 1971-12-02 1974-02-26 Ishikawa Seisakusho Kk Doffing and donning apparatus usable for textile machines such as draw-twisters
US3827227A (en) * 1973-04-30 1974-08-06 Maremont Corp Grasper bar pivoting and positioning
JPS5089642A (es) * 1973-12-13 1975-07-18
GB1419905A (en) * 1974-02-02 1975-12-31 Howa Machinery Ltd Bobbin doffing and onning apparatus
JPS542430A (en) * 1977-06-03 1979-01-10 Teijin Ltd Automatic doffing apparatus
JPS55103321A (en) * 1979-01-25 1980-08-07 Toyoda Autom Loom Works Ltd Release of control from doffing bar at intermediate position in autodoffer
EP0047838B1 (de) * 1980-09-15 1984-05-02 Maschinenfabrik Rieter Ag Hülsenauswechselvorrichtung an einer Ringspinn- oder Ringzwirnmaschine
JPS57106729A (en) * 1980-11-20 1982-07-02 Howa Mach Ltd Method of exchanging bobbins in fly frame and device therefor
CH662586A5 (de) * 1982-03-20 1987-10-15 Zinser Textilmaschinen Gmbh Spinnanlage zur herstellung von garn aus vorgarn.
DE3240822A1 (de) * 1982-11-05 1984-05-10 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Ringspinnmaschine mit einem spulengatter
DE3312116A1 (de) * 1983-04-02 1984-10-04 Zinser Textilmaschinen Gmbh, 7333 Ebersbach Vorrichtung zum ent- und beladen eines oberhalb einer ringspinnmaschine angeordneten spulengatters
DE3741434A1 (de) * 1987-12-08 1989-06-22 Zinser Textilmaschinen Gmbh Verfahren zum automatischen wechseln von spinnspulen an einer spinnmaschine
DE4005418C1 (es) * 1990-02-21 1991-07-04 Zinser Textilmaschinen Gmbh, 7333 Ebersbach, De
DE19622896C2 (de) * 1996-06-07 1999-11-25 Zinser Textilmaschinen Gmbh Betätigbares Greifelement für Hülsen an selbsttätigen Spulenwechselvorrichtungen von Ringspinnmaschinen
CN102433625A (zh) * 2012-02-21 2012-05-02 吴江市金迪喷织厂 粗纱机落纱叉
CN104233535A (zh) * 2014-08-28 2014-12-24 湖州丝葳纺织有限公司 一种细纱管自动填装装置
CH711798A1 (de) * 2015-11-19 2017-05-31 Rieter Ag Maschf Doffervorrichtung für eine Spinnmaschine.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1810754A (en) * 1927-12-31 1931-06-16 Buddecke Heinrich Bobbin changing device
US2253238A (en) * 1938-01-19 1941-08-19 American Enka Corp Apparatus for winding strandular material
US3059406A (en) * 1957-12-17 1962-10-23 Deering Milliken Res Corp Doff-don carrier arrangement and method

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR502175A (fr) * 1919-05-23 1920-05-06 Frederic Graf Appareil applicable aux machines à filer, à retordre et analogues utilisant des bobines
DE343766C (de) * 1920-06-27 1921-11-08 Friedrich Graf Vorrichtung fuer Ring-Spinn- und Zwirnmaschinen zum Abziehen der vollen und Aufstecken der leeren Spulen
US1463479A (en) * 1921-10-29 1923-07-31 William W Miller Doffing and donning mechanism
DE525154C (de) * 1927-12-31 1931-09-05 Gertrud Buddecke Geb Lindner Spulenauswechselvorrichtung, die an einem fahrbaren Kran haengend angebracht ist
US2647357A (en) * 1948-08-21 1953-08-04 Tmm Research Ltd Ring spinning machine for spinning fibrous material
US3059405A (en) * 1957-09-10 1962-10-23 Deering Milliken Res Corp Pneumatic doffing arrangement
FR1273673A (fr) * 1960-11-15 1961-10-13 Paul Desurmont & Fils Chariot de levée automatique des bobines sur un métier travaillant en continu ou autres applications
DE1180285B (de) * 1962-04-18 1964-10-22 Eugen Maier C Pneumatischer Greifer fuer Abziehvorrichtungen an kontinuierlich arbeitenden Spulenwechslern fuer Spinnmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1810754A (en) * 1927-12-31 1931-06-16 Buddecke Heinrich Bobbin changing device
US2253238A (en) * 1938-01-19 1941-08-19 American Enka Corp Apparatus for winding strandular material
US3059406A (en) * 1957-12-17 1962-10-23 Deering Milliken Res Corp Doff-don carrier arrangement and method

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3462934A (en) * 1967-04-11 1969-08-26 Zinser Textilmaschinen Gmbh Apparatus for gripping bobbins on textile machines
US3714770A (en) * 1969-11-07 1973-02-06 Zinser Textilmaschinen Gmbh Inflatable gripper for handling spools of textile machines
US3667204A (en) * 1969-12-18 1972-06-06 Rieter Ag Maschf Apparatus for conjointly doffing and donning a plurality of bobbins or tubes placed on spindles of ring spinning and ring twisting machines
US3791125A (en) * 1971-05-10 1974-02-12 Nippon Keori Co Ltd Spinning machine yarn package tube exchanging device
US3808788A (en) * 1972-03-16 1974-05-07 Nuova San Giorgio Spa Grasping device for doffing full bobbins and reloading empty tubes in a spinning frame
US3743211A (en) * 1972-06-19 1973-07-03 Murata Machinery Ltd Pneumatic bobbin hanger
US3844099A (en) * 1972-09-13 1974-10-29 Toray Industries Method and apparatus for doffing full bobbins on textile machines such as draw-twister
US3892437A (en) * 1973-02-09 1975-07-01 Finnlines Ltd Oy Center hoisting device
US3835633A (en) * 1973-04-30 1974-09-17 Zinser Textilmaschinen Gmbh Gripper for yarn carriers and the like
US4341067A (en) * 1979-02-10 1982-07-27 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Bobbin holding device in a doffing apparatus
US4365766A (en) * 1980-08-04 1982-12-28 Washington Instrument, Inc. Bobbin locking device
US4438623A (en) * 1980-11-13 1984-03-27 Rieter Machine Works Ltd. Gripper apparatus on a ring spinning or ring twisting machine
US4445323A (en) * 1981-10-29 1984-05-01 Rieter Machine Works Limited Apparatus for the conjoint gripping of bobbins on a ring spinning or ring-twisting machine
US5875984A (en) * 1997-02-08 1999-03-02 Zinser Textilmaschinen Gmbh Hanger assembly for roving bobbins and core tubes

Also Published As

Publication number Publication date
NL6515635A (es) 1966-06-20
ES329233A1 (es) 1967-11-01
US3370411A (en) 1968-02-27
DE1282526C2 (de) 1973-05-10
CH465459A (de) 1968-11-15
SE316107B (es) 1969-10-13
DE1282526B (de) 1968-11-07
GB1131247A (en) 1968-10-23
CS157618B2 (en) 1974-09-16
BE673455A (es) 1966-04-01
AT296100B (de) 1972-01-25
CS157617B2 (es) 1974-09-16
NL145291B (nl) 1975-03-17
CH473914A (de) 1969-06-15
ES329235A1 (es) 1967-05-01
DE1292563B (de) 1969-04-10
FR1455716A (fr) 1966-10-14
GB1131248A (en) 1968-10-23

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