US3366221A - Conveying mechanism in a folding machine for folded blanks - Google Patents

Conveying mechanism in a folding machine for folded blanks Download PDF

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Publication number
US3366221A
US3366221A US574996A US57499666A US3366221A US 3366221 A US3366221 A US 3366221A US 574996 A US574996 A US 574996A US 57499666 A US57499666 A US 57499666A US 3366221 A US3366221 A US 3366221A
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United States
Prior art keywords
conveying
blanks
blank
conveying mechanism
folded
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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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US574996A
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English (en)
Inventor
Preisig Roland
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Bobst Mex SA
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Bobst SA
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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
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device
    • B65H5/222—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices
    • B65H5/224—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device by suction devices by suction belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/02—Feeding or positioning sheets, blanks or webs
    • B31B50/04—Feeding sheets or blanks
    • B31B50/046—Feeding sheets or blanks involving changing orientation or changing direction of transport
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/02—Feeding or positioning sheets, blanks or webs
    • B31B50/10—Feeding or positioning webs
    • B31B50/106—Feeding or positioning webs involving changing orientation or changing direction of transport
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/26—Folding sheets, blanks or webs
    • B31B50/36—Folding sheets, blanks or webs by continuously feeding the sheets, blanks or webs to stationary members, e.g. plates, ploughs or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/332—Turning, overturning
    • B65H2301/3321—Turning, overturning kinetic therefor
    • B65H2301/33216—Turning, overturning kinetic therefor about an axis perpendicular to the direction of displacement and to the surface of material
    • 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

Definitions

  • ABSTRACT OF THE DISCLOSURE A conveying mechanism in which a folded blank is placed on a flat outer surface of a conveying member which undergoes translational and rotational movement while supporting the folded blank, the conveying member having a suction passage in communication with the openings in the outer surface which is subjected to a vacuum during selected portions of the path of travel of the conveying member to maintain the folded blank against the outer surface of the conveying member, a guiding member being located adjacent the conveying member and extending parallel to and adjacent the outer surface of the conveying member for engaging the folded blank and maintaining the folded condition thereof while the blank undergoes movement with the conveying member.
  • This invention relates to a conveying mechanism and more particularly to a conveying mechanism for folded blanks such as paper or cardboard.
  • blanks are cut to a predetermined profile, after which they are folded in a folding machine along preivously upset lines.
  • the known conveying mechanisms employ a pair of coaxial rotary members disposed one above the other for gripping a blank between them and turning the blank in its plane while undergoing common translatory motion.
  • the transported blanks generally are already partially folded, and these folds tend to open due to the elasticity of the cardboard or paper, unless the folded condition of the blanks is maintained during their transport.
  • An object of the invention is to provide a conveying mechanism which avoids the above deficiency.
  • a further object of the invention is to provide a conveying mechanism in a folding machine in which the folded condition of the transported blanks is preserved during their transport.
  • the conveying device comprises a conveying member adapted for receiving a folded blank and for undergoing translational and rotational movement, said conveying 3,3662% Patented Jan. 39, 1968 member having an outer surface for supporting the blank in which surface are formed openings, means for establishing suction in said openings to maintain the blank against the outer surface of the conveying member, and a guiding member located adjacent the conveying member and having a surface extending parallel to and adjacent the outer surface of the conveying member for engaging the blank and maintaining the folded condition thereof while the blank undergoes movement with the conveying member.
  • FIG. 1 is a diagrammatical illustration in plan view of a folding machine
  • FIG. 2 shows a device according to the prior art for conveying a blank in the machine of FIG. 1;
  • FIG. 3 is a schematic side view of the portion of the machine corresponding to FIG. 2 in accordance with the invention.
  • FIG. 4 shows the conveying mechanism according to the invention in simplified fashion in perspective
  • FIG. 5 is a transverse sectional view through the conveying mechanism
  • FIG. 6 is a longitudinal sectional view through the conveying mechanism as taken along lines VIVI in FIG. 5;
  • FIG. 7 is a schematic elevation view of the overall conveying mechanism.
  • FIG. 8 is a diagrammatic illustration of the conveying mechanism of FIG. 7 with supply and removal means.
  • FIG. 1 of the drawing there is shown a rectangular frame 1 of a folding machine for the folding of blanks.
  • the blanks 2 are supplied to the frame 1 at one end thereof and discharged therefrom at the other end.
  • the machine is divided into two working zones A and B.
  • zone A the blanks are disposed transversely while being advanced through the machine, while in zone B they are disposed longitudinally while being advanced through the machine.
  • zone B each blank is rotated a quarter of a turn in its plane from the position shown at 2 to the position shown at 3'.
  • the blank 2 is gripped between two coaxial rotary members 4, 5 which undergo concurrent rotation and translation in the direction of arrow 6.
  • the blank has already undergone at least one folding operation and will present a folded flap 7 or the like.
  • the flap 7 in the arrangement of FIG. 2 is not maintained against the blank during transport thereof and due to the elasticity of the blank, the flap will tend to unfold as shown.
  • the centrifugal force developed by the rotation of the members 4, 5 and air resistance will also tend to unfold flap 7.
  • FIG. 3 there is shown the arrangement according to the invention whereby the folded condition of the blank will be maintained during the rotation and translation of the blank.
  • a conveying member 8 supports the blank 2 and holds the same thereagainst by suction as a result of connection with a vacuum pump via line 9.
  • a plate 10 is disposed above the member 8 and engages the blank to maintain the flap 7 thereof in folded condition while the blank undergoes movement with the member 8.
  • the plate 10 hasan absolutely smooth lower surface enabling smooth sliding movement of the partly folded blank thereagainst.
  • the plate 10 will be transparent in order to enable the operator to visibly establish that the blanks are properly being conveyed while their folded condition is maintained.
  • FIG. 4 shows in greater detail the arrangement of the mechanism of FIG. 3.
  • FIG. 4 there are seen a succession of conveying members 8 which pass between two surfaces 11 and 12 located in a common plane.
  • Each conveying member 8 comprises a rotatable member 14 centrally mounted in a support member or block 13.
  • Each member 14 is provided with suction openings 14' for drawing thereagainst the blanks being transported on the surfaces 11 and 12.
  • the plate 10 extends above surfaces 11 and 12 and serves as a guiding member for the blanks to maintain the folded condition thereof while the blanks are transported.
  • Two successive blocks 13 are shown in FIG. 4 and these form a part of an endless chain of such blocks as will be described later.
  • FIGS. and 6 show the construction of blocks 13 and how the rotatable members 14 are momentarily connected to a vacuum source during transport.
  • Each rotatable member 14 with its suction openings 14' is formed with a fiat head portion, beneath which depends a partly hollow shaft 17 which is rotatably mounted in the block 13.
  • a nut 18 holds the member 14 axially in the block 13.
  • the shaft 17 is hollow and is provided with lateral apertures 17' to provide communication between the inside of the shaft and a lateral chamber 19 in the block 13.
  • the block 13 passes, during transport, on a rail member 20 which is provided with a vacuum chamber 21.
  • the upper face of member 20 facing chamber 19 is formed with a series of apertures. These apertures are normally closed by valve members in the form of balls 22 which are subjected to the action of springs 23. In FIG. 6, only one of these springs is shown.
  • a pump (not shown) creates a vacuum in the fixed lower chamber 21.
  • the pressure exerted by each spring 23 is sufiicient to overcome the suction and normally maintains the valve member in closed position.
  • a bar 24 is secured to each block 13 and passes on member 20 during the travel of the block.
  • bar 24 contacts the balls 22 to push them into chamber 21 against the action of springs 23 and temporarily establish communication between the movable upper chamber 19 in the block and the fixed lower chamber 21 in member 20.
  • FIG. 6 is clearly shown how on its passage on the member 20 the block 13 opens the valve members and thereby establishes suction in the openings 14 in rotatable member 14.
  • the bar 24 has a forwardly projecting portion with an upwardly slanting surface 24', allowing the bar to pass over the balls and lower them.
  • the arrangement of the block 13 is for the most part symmetrical, in the sense that the block 13 slides on a rail member 20 similar with regard to member 20 and containing a vacuum chamber and ball valves 22'.
  • a vacuum chamber and ball valves 22' opposite the upper chamber 19 in the block 13, there is only a blind space or groove 19' and valve members 22' remain closed. The significance of the latter will be shown later.
  • FIG. 7 This connection is shown diagrammatically in FIG. 7, wherein an endless chain assembly of six blocks 13 is formed.
  • the blocks 13 are connected by the pairs of chains 27 which pass on chain wheels 28 and 29.
  • the blocks 13 slide on the rail member 20 as shown in FIG. 7 in a simplified way.
  • the blanks are fed between the blocks 13 and the plate in a manner to be described later.
  • the ball valves are lowered and the suction effect is transmitted to the blocks and thereby to the blanks which are conveyed therewith.
  • the elastic bands 16 are held around the wheels 28, 29 by stretching arms 30.
  • the apparatus described so far serves for translational travel of the blanks.
  • the rotation of the blanks is effected as follows:
  • the shaft 17 of the rotatable member 14 terminates at its lower end in a lever arm 31 having at its outer end a roller 32.
  • bars 33 and 34 are positioned along the path of the blocks 13 to contact rollers 32.
  • bars 33, 34 are linear cams, of which cam 33 contacts roller 32 to produce a quarter turn of the shaft 17 in one direction while the opposite cam 34 is effective to return the shaft 17 to its initial position.
  • the rotation will normally be a quarter of a turn
  • the cams can be replaced to produce half a turn.
  • alternate blocks 13 will operate alternate valve members 22 and 22.
  • every member 8 may be subjected to suction or every other member may be subject to suction. This allows adaptation of the device to various size blanks.
  • FIG. 8 shows very diagrammatically the overall conveyor mechanism, as mounted in a folding machine. Therein there are again shown the wheels 28, 29 and the chains 27 causing the conveying members 8 (not shown) to pass under the plate 10.
  • the partly folded blanks advance from left to right in FIG. 8 and pass firstly between accelerating rolls 35 which space the blanks from each other to enable their subsequent rotation.
  • the speed of the blanks at the exit of rolls 35 will be for instance 1.2 times the normal conveying speed of the machine.
  • the chains 27 are likewise displaced at that increased speed as are upper and lower conveying belts 36, 37 which receive the blanks after rotation and remove them for delivery to chain 38.
  • This chain is provided with stops 39 which engage the blanks and deliver the same in correct position for subsequent folding by further folding members of the folding machine.
  • the conveyor mechanism as shown in FIG. 8 is positioned between zones A and B in FIG. 1 to effect rotation of the blanks.
  • a conveying mechanism for folded blanks comprising a conveying member including a support member which is displaceable along a path which is at least in part linear, and a rotatable member mounted in said support member and adapted for receiving a folded blank and for undergoing translational and rotational movement while supporting the folded blank, and rotatable member having a flat outer surface for receiving the blank, said outer surface having openings therein, means for establishing suction in said openings on selected portions of the path of travel of the conveying member to maintain the folded blank against the outer surface of the rotatable member and a guiding member located adjacent the conveying member and having a surface extending parallel to and adjacent the outer surface of the rotatable member for engaging the folded blank and maintaining the folded condition thereof while the blank undergoes movement with the rotatable member.
  • a conveying mechanism as claimed in claim 1 comprising cam means disposed along the path of the support member for rotating the rotatable member within the support member as the latter undergoes displacement.
  • a conveying mechanism as claimed in claim 1 comprising at least one rail supporting the support member for displacement along its path of travel, said rail having a vacuum chamber and valve means for said chamber, said means for establishing suction in said openings comprising means on said support member for opening said valve means and establishing communication between the vacuum chamber and said openings in the rotatable member during the selected portions of travel of the support member along its path.
  • valve means comprises a plurality of successive valve members in said rail, spring means urging each of the valve members to closed position, said means for opening said valve means comprising a bar on said support member which opens successive valve members during displacement of the support member.
  • a conveying mechanism as claimed in claim 4 comprising means connecting a plurality of successive conveying members to form an endless chain.
  • a conveying mechanism as claimed in claim 6 comprising a second rail supporting the support members of the conveying members, the means on the support members for opening said valve means being arranged so that alternate conveying members are in communication with the vacuum chambers of opposite rails.
  • a conveying mechanism as claimed in claim 1 comprising elastic bands connecting a plurality of conveying members in succession, and guide members spaced apart to permit passage therebetween of the conveying members and elastic bands, and guide members having outer surfaces which are coplanar with the outer surfaces of the rotatable members.
  • a conveying mechanism as claimed in claim 1 comprising means connecting a plurality of successive conveying members together to form an endless chain, means for driving said chain along a path in which at least one portion of the length of the chain is linear, said guiding member being located adjacent the linear portion of said chain, means for feeding folded blanks between the guiding member and the linear portion of the chain at one end thereof and means for receiving the blanks at the other end of the linear portion of the chain.
  • a conveying mechanism as claimed in claim 1 wherein said means for establishing suction in said openings is constituted by a suction passage in said conveying member in communication with said openings, and means on said conveying member for providing selective communication of said suction passage with a suction source during travel of the conveying member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
US574996A 1965-08-31 1966-08-25 Conveying mechanism in a folding machine for folded blanks Expired - Lifetime US3366221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1221665A CH423446A (fr) 1965-08-31 1965-08-31 Mécanisme transporteur dans une machine pliant des découpes, par exemple de carton

Publications (1)

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US3366221A true US3366221A (en) 1968-01-30

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US574996A Expired - Lifetime US3366221A (en) 1965-08-31 1966-08-25 Conveying mechanism in a folding machine for folded blanks

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US (1) US3366221A (fr)
CH (1) CH423446A (fr)
ES (1) ES330714A1 (fr)
FR (1) FR1491040A (fr)
GB (1) GB1138875A (fr)
SE (1) SE317569B (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661095A (en) * 1969-07-30 1972-05-09 Koch Sons George Conveyor accessory
US4000864A (en) * 1974-11-20 1977-01-04 Les Ateliers De Constructions Mecaniques Method and means for winding pre-cut bags to form rolls
US4108302A (en) * 1974-03-27 1978-08-22 J. Bobst & Fils, S.A. Suction conveyor
EP0103104A2 (fr) * 1982-08-19 1984-03-21 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Dispositif de transport de feuilles ou de paquets de feuilles
US4561358A (en) * 1983-07-05 1985-12-31 Radiation Dynamics, Inc. Apparatus for conveying articles through an irradiation beam
US6164431A (en) * 1997-05-30 2000-12-26 Bobst S.A. Roller or belt conveying device for sheet-like or plate-like workpieces of low specific gravity
WO2001027011A1 (fr) * 1999-10-09 2001-04-19 Böwe Systec AG Dispositif pour tourner une pile de papier
US6435332B1 (en) 2000-11-03 2002-08-20 Sig Pack, Inc., Doboy Division Conveyor module for simultaneous translation and rotation of products
US10894672B2 (en) * 2014-06-27 2021-01-19 Graphie Packaging International, LLC Continuous motion packaging machine with rotating flights
CN114083829A (zh) * 2021-11-26 2022-02-25 中科天工（武汉）智能技术有限公司 带胶纸料折边方法及装置
CN115179586A (zh) * 2022-07-25 2022-10-14 江苏华宇印务有限公司 一种酒盒的自动化加工生产线

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE755199A (fr) * 1969-09-18 1971-02-01 Jagenberg Werke Ag Procede et dispositifs pour relever les pattes de carton des ebauches de boites pliantes en carton
CH577419A5 (fr) * 1974-03-27 1976-07-15 Bobst Fils Sa J
DE4213489A1 (de) * 1991-11-15 1993-05-19 Focke & Co Verpackung, insbesondere gebinde fuer zigaretten-packungen, sowie zuschnitt hierfuer und verfahren zur herstellung der verpackung
DE102008047265A1 (de) * 2008-09-12 2010-04-15 Heidelberger Druckmaschinen Ag Faltschachtelklebemaschine zur Herstellung von Faltschachteln aus Zuschnitten
CN106628816A (zh) * 2016-10-10 2017-05-10 金锋馥（滁州）输送机械有限公司 转向水平输送机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1096075A (en) * 1912-02-15 1914-05-12 W C Ritchie & Company Pasteboard-box-necking machine.
US2618207A (en) * 1947-02-07 1952-11-18 American Tool Works Boxmaking machine
US2812079A (en) * 1952-06-16 1957-11-05 Carnine Sorting machine
US3189158A (en) * 1962-10-31 1965-06-15 Procter & Gamble Sheet turning mechanism
US3294216A (en) * 1964-03-25 1966-12-27 Girardi Antonio Lawrence Extensible conveyor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1096075A (en) * 1912-02-15 1914-05-12 W C Ritchie & Company Pasteboard-box-necking machine.
US2618207A (en) * 1947-02-07 1952-11-18 American Tool Works Boxmaking machine
US2812079A (en) * 1952-06-16 1957-11-05 Carnine Sorting machine
US3189158A (en) * 1962-10-31 1965-06-15 Procter & Gamble Sheet turning mechanism
US3294216A (en) * 1964-03-25 1966-12-27 Girardi Antonio Lawrence Extensible conveyor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661095A (en) * 1969-07-30 1972-05-09 Koch Sons George Conveyor accessory
US4108302A (en) * 1974-03-27 1978-08-22 J. Bobst & Fils, S.A. Suction conveyor
US4000864A (en) * 1974-11-20 1977-01-04 Les Ateliers De Constructions Mecaniques Method and means for winding pre-cut bags to form rolls
EP0103104A2 (fr) * 1982-08-19 1984-03-21 M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft Dispositif de transport de feuilles ou de paquets de feuilles
EP0103104A3 (en) * 1982-08-19 1985-12-04 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Device for advancing sheets or batches of sheets
JPH0699056B2 (ja) 1982-08-19 1994-12-07 エム・ア−・エヌ−ロ−ラント・ドルツクマシ−ネン・アクチエンゲゼルシヤフト 枚葉紙又は枚葉紙パイルの搬送装置
US4561358A (en) * 1983-07-05 1985-12-31 Radiation Dynamics, Inc. Apparatus for conveying articles through an irradiation beam
US6164431A (en) * 1997-05-30 2000-12-26 Bobst S.A. Roller or belt conveying device for sheet-like or plate-like workpieces of low specific gravity
WO2001027011A1 (fr) * 1999-10-09 2001-04-19 Böwe Systec AG Dispositif pour tourner une pile de papier
US6435332B1 (en) 2000-11-03 2002-08-20 Sig Pack, Inc., Doboy Division Conveyor module for simultaneous translation and rotation of products
US10894672B2 (en) * 2014-06-27 2021-01-19 Graphie Packaging International, LLC Continuous motion packaging machine with rotating flights
US11577915B2 (en) * 2014-06-27 2023-02-14 Graphic Packaging International, Llc Continuous motion packaging machine with rotating flights
CN114083829A (zh) * 2021-11-26 2022-02-25 中科天工（武汉）智能技术有限公司 带胶纸料折边方法及装置
CN114083829B (zh) * 2021-11-26 2023-03-10 中科天工（武汉）智能技术有限公司 带胶纸料折边方法及装置
CN115179586A (zh) * 2022-07-25 2022-10-14 江苏华宇印务有限公司 一种酒盒的自动化加工生产线
CN115179586B (zh) * 2022-07-25 2023-10-13 江苏华宇印务有限公司 一种酒盒的自动化加工生产线

Also Published As

Publication number Publication date
ES330714A1 (es) 1967-06-16
FR1491040A (fr) 1967-08-04
SE317569B (fr) 1969-11-17
GB1138875A (en) 1969-01-01
CH423446A (fr) 1966-10-31

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