EP0252177B1 - Dispositif pour connecter un levier oscillant d'une ratière à un cadre d'un métier à tisser - Google Patents

Dispositif pour connecter un levier oscillant d'une ratière à un cadre d'un métier à tisser Download PDF

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Publication number
EP0252177B1
EP0252177B1 EP19860109364 EP86109364A EP0252177B1 EP 0252177 B1 EP0252177 B1 EP 0252177B1 EP 19860109364 EP19860109364 EP 19860109364 EP 86109364 A EP86109364 A EP 86109364A EP 0252177 B1 EP0252177 B1 EP 0252177B1
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EP
European Patent Office
Prior art keywords
adjusting lever
pivot bearing
swivel arm
clamping
swing arm
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
Application number
EP19860109364
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German (de)
English (en)
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EP0252177A1 (fr
Inventor
Franz Kast
Horst Ozga
Werner Schmidlin
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.)
Kaiser GmbH and Co KG
Original Assignee
Kaiser GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kaiser GmbH and Co KG filed Critical Kaiser GmbH and Co KG
Priority to EP19860109364 priority Critical patent/EP0252177B1/fr
Priority to DE8686109364T priority patent/DE3668921D1/de
Publication of EP0252177A1 publication Critical patent/EP0252177A1/fr
Application granted granted Critical
Publication of EP0252177B1 publication Critical patent/EP0252177B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D03C1/144—Features common to dobbies of different types linking to the heald frame

Definitions

  • the invention relates to a device for connecting a swing arm of a dobby to a shaft of a weaving machine, with an adjustment lever which receives the swing arm in a recess and is adjustable and lockable in the longitudinal direction of the swing arm, on which a connecting rod leading to the shaft is articulated in a pivot bearing, the relative distance to the swing arm is adjustable and lockable.
  • the adjustment lever is divided into two parts, namely a part that is adjustable and lockable in the longitudinal direction of the shaft.
  • a further part which contains the pivot bearing, is attached and can be fixed.
  • the part containing the pivot bearing is secured by tilting or by latching two toothings in the other part. It has been shown that securing by tilting is not sufficient for higher loads. Securing by snapping two gears has the disadvantage that a continuous adjustment is not possible.
  • a further type is known (DE-PS 27 37 936), which is based on the same basic principle of dividing the adjusting lever into two parts.
  • a part is designed as a loop and can be clamped to the swing arm.
  • This loop is arranged within the second part, which contains the rotary bearing and which is designed as a tube surrounding the loop.
  • Tensioning means are arranged within this tube on the side of the swing arm facing away from the pivot bearing, with which the loop is tensioned against the swing arm. During tensioning, the tensioning means spread out, where they lie against the walls of the second part, which is designed as a tube, and clamp it.
  • This type of construction has the advantage that only one clamping screw needs to be actuated to lock and loosen both parts of the adjusting lever.
  • the bracing elements must be completely released. This also means that the exact positioning in the longitudinal direction of the swing arm is lost.
  • Another disadvantage is that both parts of the adjusting lever, namely the loop and the tube, have to be guided around the swing arm in the same place. Because of the specified small width dimension of adjusting levers, this means that the swing arm and / or both parts of the adjusting lever have to be dimensioned relatively weak.
  • the wedge bracing also requires a relatively large length across the swing arm.
  • the invention has for its object to provide a device of the type mentioned in such a way that a stable design is possible and that in particular the work on positioning the pivot bearing transverse to the swing arm does not result in the exact position of the adjusting lever being lost in the longitudinal direction of the swing arm .
  • the pivot bearing is fixedly attached to the adjusting lever, which is held on the oscillating arm in the longitudinal direction and transversely thereto, and is held and adjustable, for which purpose the adjusting lever is held between two clamping elements arranged transversely to the oscillating arm and encompassing the oscillating arm in a loop, which can be clamped transversely to the swing arm by means of their own clamping screws arranged on the side facing away from the pivot bearing and which are connected at least on the side facing the pivot bearing to a connecting element which generates the clamping elements against the end faces of the adjusting lever during tensioning.
  • Fig. 1 shows from a weaving machine, not shown, a shaft (2) which is articulated via an angular gear (34) with a connecting rod (4) to a swing arm (1) of a dobby, not shown.
  • An adjusting lever (3) is arranged on the swing arm (1) and is adjustable and fixable on the swing arm (1) for stroke adjustment in the longitudinal direction.
  • the adjusting lever (3) which is provided with a pivot bearing (5) for articulating the connecting rod (4), can also be adjusted and locked transversely to the swing arm (1), so that the relative distance of the pivot bearing (5) to that Swing arm (1) is adjustable.
  • the shaft (2) is positioned by means of this setting, which is directed transversely to the swing arm. For both adjustment movements, the adjustment lever (3) forming a structural unit with the pivot bearing (5) is adjusted as a whole.
  • the adjusting lever (3) consists of a U-shaped steel band.
  • the pivot bearing (5) is fastened between the free ends of the legs running parallel to one another, in particular by riveting by means of several rivets or by spot welding.
  • the distance between the two legs corresponds approximately to the thickness of the swing arm, which is designed as a rod with a flat, rectangular cross section.
  • Clamping elements (6, 7) are arranged on both sides of the adjusting lever (3), which are looped around the swing arm (1) and whose wall thickness corresponds approximately to the wall thickness of the steel band of the adjusting lever (3).
  • the two tensioning elements (6, 7) form a guide for the adjusting lever (3) which runs transversely to the swing arm (1). They are designed and arranged in such a way that, when they are braced against the swing arm (1), they simultaneously apply a force component directed towards one another, so that they clamp the adjusting lever (3) between them and thus securely fix them to the swing arm (1).
  • the two tensioning elements (6 and 7) consist of endless loops made of steel band, which are parallel to the adjusting lever. On the side facing the pivot bearing, they are connected to one another by a connecting element (10) which has an essentially double-T-shaped configuration (FIG. 4).
  • the thickness of the central web (12) of this connecting element (10) is somewhat greater than that of the swing arm (1).
  • the connecting element (10) rests on the side of the swing arm (1) facing the pivot bearing (5).
  • the central web (12) is delimited by transverse webs (13 and 14), which project from the central web (12) by an amount equal to the wall thickness of the loops (6, 7) and thus also the wall thickness of the Leg of the adjusting lever (3) corresponds.
  • the two crosspieces (13 and 14) hold the tensioning elements (6 and 7) on the side facing away from the adjusting lever (3).
  • a further connecting element (24) for the two clamping elements (6, 7) is provided between the clamping elements (6, 7) in the region of the end facing away from the rotary bearing (5).
  • This tensioning element (24) also has an essentially double-T-shaped shape, the central web (36) of which corresponds somewhat more than the strength of the swing arm (1), while the two cross webs (37 and 38) thereof have approximately the strength of the loop-shaped one Project the clamping elements (6, 7) and thus also the wall thickness of the legs of the adjusting lever (3).
  • Clamping screws (8, 9) are inserted through the ends of the loop-shaped tensioning elements (6, 7) facing away from the rotary bearing (5) and are directed parallel to the adjusting lever (3) and thus in the longitudinal direction of the tensioning elements (6 and 7).
  • clamping screws (8, 9) are screwed into threaded bores (39, 40) of the connecting element (24). They are supported in the direction of the end face of the swing arm (1) against an intermediate element (18), so that by tightening them the connecting element (10) is tightened and clamped against the end face of the swing arm (1) facing the pivot bearing (5).
  • the transverse webs (13 and 38) of the connecting profiles (10 and 24) are inclined in opposite directions to the associated end face of the adjusting lever (3).
  • the clamping element (6) has correspondingly inclined clamping surfaces (15 and 45), so that when the clamping screw (8) is tightened, the clamping element (6) is pressed against the end face of the adjusting lever (3) facing it. In this way, the adjusting lever (3) becomes form-fitting. held between the two clamping elements (6, 7).
  • the two transverse webs (14 and 37) of the connecting elements (10 and 24), which are assigned to the tensioning element (7), run parallel to the end face of the adjusting lever (3) facing them.
  • the adjusting lever (3) can still be moved transversely in the transverse guide formed by the two clamping elements (6, 7). It can thus be adjusted for positioning the shaft without the set position of the adjusting lever (3) being lost in the longitudinal direction of the swing arm (1).
  • the adjusting lever (3) is positioned in the transverse direction to the swing arm (1) via an adjusting screw (20) which extends in the longitudinal direction of the adjusting lever (3) and which projects with its head out of the end facing away from the pivot bearing (5).
  • the intermediate element (18) which is arranged between the connecting element (24) and the swing arm (1), is provided with a projection (46) which extends in the direction of the end of the adjusting lever (3).
  • the extension (46) of the intermediate element (18) and the central web (36) of the connecting element (24) are each provided with cutouts (44, 47) through which their cross section is approximately half is reduced so that these two parts can be moved past each other.
  • a threaded bore (22) into which the adjusting screw (20) is screwed.
  • a stop (23) is rotatably attached, for example a nut, or the like by welding or gluing. is rotatably connected to the adjusting screw (20).
  • a window (31) is provided in the two legs of the adjusting lever (3), in which this stop (23) is guided in the axial direction of the adjusting screw (20).
  • the adjusting screw (20) which is adjustable relative to the extension (46) in its threaded bore (23) thus takes the adjusting lever (3) with it when it is turned.
  • Fig. 2 to 6 modified embodiment it is provided that the intermediate element (18) and the connecting element (24) are formed as one component.
  • the clamping screws (8, 9) are then supported directly against the end of the swing arm facing them.
  • this embodiment is cheaper to manufacture, there is a risk that, due to the direct support of the tensioning screws (8, 9) on the swing arm (1), inadvertent tilting can occur, so that the adjusting lever (3) may not be completely vertical runs to the swing arm (1).
  • the same basic principle is realized, namely that the adjusting lever (30) forms a structural unit with the rotary bearing (5), which can be adjusted both in the longitudinal direction of the swing arm (1) and transversely thereto and can be clamped thereon is appropriate.
  • two loop-shaped tensioning elements (16, 17) are arranged on both sides of the adjusting lever (30), which surround the swing arm (1) and which can be tightened on the swing arm (1), generating a force component directed towards each other between them the setting lever (30) is clamped in a form-fitting manner.
  • the adjusting lever (30) consists of two parallel plates made of sheet steel or the like, which are connected at one end by the pivot bearing (5) and at the other end by two blocks (28, 29).
  • the blocks (28, 29) and the pivot bearing (5) are expediently firmly connected to the two loops, for example by riveting or spot welding.
  • the two tabs of the adjusting lever (30) are at a distance which corresponds approximately to the thickness of the swing arm (1).
  • a connecting element (11) is provided between the two clamping elements (16, 17) on the side of the swing arm (1) facing the pivot bearing (5).
  • This connecting element (11) is a profile made of flat iron, which has approximately the strength of the swing arm (1) and which rests with its back flat against the end face of the swing arm (1) facing the pivot bearing (5).
  • connection between the tabs and the connecting element (11) and the block (27) is also advantageously carried out by riveting or welding.
  • a clamping screw (9), which runs parallel to the adjusting lever (30), is screwed into the block (27) and is supported by a flange of an intermediate element (19) against the end of the swing arm (1) facing away from the pivot bearing (5).
  • the upper clamping element (16) in the drawing also consists of two tabs which run parallel to the adjusting lever (30) and encompass the swing arm (1) and which are connected at their ends to each other by a block (25, 26).
  • a clamping screw (8) is screwed into the block (26), which also runs parallel to the adjusting lever (30) and is supported via a flange of the intermediate element (19) against the side of the swing arm (1) facing away from the pivot bearing (5) .
  • the connecting element (11) has a guide surface directed obliquely towards the adjusting lever (30), to which a correspondingly inclined guide surface of the block (25) of the clamping element (16) is assigned.
  • the block (25) is provided on its face facing the end face of the adjusting lever (30) with a rib-like contact surface (51) running parallel to it.
  • the wedge-like block (25) is thus drawn in between the guide surface (50) of the connecting element (11) and the end face of the adjusting lever (30) facing it, so that a force component in the direction of the other clamping element (17), through which the adjusting lever (30) is clamped in a form-fitting manner in the region of the connecting element (11).
  • the connecting element (11) is provided in the region of its end facing away from the guide surface (50) with two rib-like projections (52) which are assigned to the other end face of the adjusting lever (30).
  • the block (25) and the connecting element (11) are made of a material that is suitable for absorbing the high surface pressure.
  • the section according to FIG. 9 shows an embodiment which is somewhat modified compared to the embodiment according to FIG. 7.
  • the rib-like projections (51) of the block (25) and the rib-like projections (52) of the connecting element (11) are beveled.
  • the opposite end faces are also the beveled on both legs of the adjusting lever (30).
  • the bevel is chosen so that when bracing, the two legs of the adjusting lever (30) are loaded inwards towards the swing arm. This ensures that the legs of the adjusting lever (30) do not deform outwards due to a pressure load.
  • the legs of the adjusting lever (30) are supported with their edges against the force achieved by this bevel against webs of the connecting element (11) and the block (25) which plunge between the two legs of the adjusting lever (30), as shown in Fig. 9 is shown.
  • the thickness of the web of the connecting element (11) and of the web of the block (25) is selected to be somewhat greater than the thickness of the swing arm (1), for example in the order of 0.1 to 0.2 mm, as is the case compared to the swing arm shown in dashed lines in FIG. 9. This ensures that the swing arm (1) does not jam against the adjusting lever (30) when adjusting.
  • an adjusting screw (21) is provided which extends parallel to the adjusting lever (30) and which is arranged on the side facing away from the pivot bearing (5).
  • This adjusting screw (21) is screwed into a thread (23) of the block (29) which connects the two tabs of the adjusting lever (30) at its end.
  • the adjusting screw (21) is inserted with a cylindrical, non-threaded part through a bore (54) of the intermediate element (19).
  • the end of this cylindrical part is provided with a stop (55) axially attached to the adjusting screw (21).
  • the end of the adjusting screw (21) lies directly opposite the end of the swing arm (1) at a short distance.
  • the adjusting lever (30) is clamped in the vicinity of the pivot bearing (5), but only over a relatively short length.
  • it is additionally supported in the region of its end facing away from the pivot bearing (5) against the swing arm (1) or the intermediate element (19).
  • the intermediate element (19) is provided with an extension (56) which extends in the longitudinal direction of the adjusting lever (30) and projects beyond the end of the adjusting lever (30).
  • a locking screw (57) extending transversely to the adjusting lever (30) is screwed in, which engages on the shoulder (56).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Clamps And Clips (AREA)
  • Buckles (AREA)

Claims (15)

1. Dispositif pour la liaison d'un bras oscillant (1) d'une ratière avec un cadre (2) d'un métier à tisser, du genre comprenant un levier de réglage (2) recevant le bras oscillant dans une cavité et monté de façon à être ajustable et verrouillable dans le sens longitudinal du bras oscillant, levier sur lequel une barre de raccordement (4) allant vers le cadre est articulée sur un palier de pivotement (5) dont la distance relativement au bras oscillant est ajustable et blocable, caractérisé en ce que le palier de pivotement (5) est monté sur le levier de réglage (3, 30) lequel est maintenu sur le bras oscillant de manière ajustable et verrouillable dans le sens longitudinal de celui-ci et dans le sens transversal, le levier de réglage (3, 30) étant à effet maintenu entre deux éléments de serrage (6, 7, 16, 17) disposés transvera- lement par rapport au bras oscillant (1) et l'entourant à la manière de crochets fermés, lesdits éléments de serrage pouvant chacun être verrouillées transversalement au bras oscillant au moyen d'une vis de serrage (8, 9), disposée sur le côté opposé au palier de pivotement (5) tandis qu'ils sont reliés, sur leur côté tourné vers le palier de pivotement (5), à au moins un organe de liaison (10, 11), qui crée, au serrage des éléments de serrage (6, 7, 16, 17), une composante de force agissant sur les faces antérieures du levier de serrage (3, 30).
2. Dispositif selon la revendication 1, caractérisé en ce que l'organe de liaison (10) présente une forme sensiblement en double T, la traverse intermédiaire (12) ayanat une épaisseur qui correspond approximativement à l'épaisseur du bras oscillant (1) et en ce que l'une de ses traverses (13, 14) dont la largeur correspond à l'épaisseur du levier de réglage (3) présente une inclinaison en direction de la face tournée vers elle du levier de réglage (3), à laquelle correspond une surface portante (15) de pente correspondante de l'élément de serrage (6).
3. Dispositif selon la revendication 1, caractérisé en ce que l'organe de liaison (11) qui porte sur le côté du bras oscillant (1) tourné vers le coussinet de pivotement (5), présente un profil ayant approximativement l'épaisseur du bras oscillant (1), en ce qu'il comporte un élément de serrage intégral (17) et en ce que sur son côté tourné vers le coussinet de pivotement (5) il est muni d'une surface de guidage oblique pour le deuxième élément de serrage (16).
4. Dispositif selon l'une des revendications 1 à 3, caractérisé en ce qu'à l'intérieur de la cavité du levier de réglage (3, 30), sur le côté opposé au palier de pivotement (5), est disposé un élément intermédiaire (18, 19) appuyant contre le bras oscillant (1), et contre lequel sont en prise les vis de serrage (8, 9) des deux éléments de serrage (6, 7, 16, 17).
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce qu'un élément intermédiaire (18, 19) appuyant contre le bras oscillant (1) est disposé à l'intérieur de la cavité du levier de réglage (3, 30) sur la face opposée au palier de pivotement (5) et dans lequel s'étend une vis de réglage (20, 21) disposée dans le sens longitudinal du levier de réglage (3, 30).
6. Dispositif selon la revendication 5, caractérisé en ce que la vis de réglage (20) qui est, dans le sens axial guidée dans le levier de réglage (3) est vissée dans un filetage (22) de l'élément intermédiaire (18).
7. Dispositif selon la revendication 5, caractérisé en ce que, dans son sens axial, la vis de réglage (21) est guidée dans l'élément intermédiaire (19) et/ou sur le bras oscillant (1) et en ce qu'elle est vissée dans un filetage (23) du levier de réglage (30).
8. Dispositif selon l'une quelconque des revendication 1 à 7, caractérisé en ce qu'il est prévu un autre élément de liaison (24) en forme de crochet pour les éléments de serrage (6, 7) sur le côté du bras oscillant (1) opposé au palier de pivotement (5).
9. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce que l'organe de liaison (10, 11) est relié à un élément de serrage (7, 17) sur le côté tourné vers le palier de pivotement (5).
10. Dispositif selon l'une quelconque des revendications 1 à 9, caractérisé en ce que les éléments de serrage (16, 17) présentent deux éclisses parallèles, qui sont reliées à leurs extrémités par des blocs (11, 25, 26, 27).
11. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que le bloc unissant les éclisses d'un élément de serrage (17) sur le côté tourné vers le palier de pivotement (5) est l'élément de liaison (11) pour les deux éléments de serrage (16, 17).
12. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le levier de réglage (30) présente deux éclisses paralléles, rel- liées entre elles à l'une de ses extrémités par au moins un bloc (28) et à l'autre extrémité par le palier de pivotement (5).
13. Dispositif selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le levier de réglage (3) est forme d'un ruban courbe en forme de U, entre les extrémités libres duquel est disposé le palier de pivotement (5).
14. Dispositf selon la revendication 13, caractérisé en ce qu'une ouverture (31) est ménagée dans les deux éclisses ou les deux branches du levier de réglage (3) et dans laquelle est maintenue une butée (23) disposée sur la vis de réglage (20) dans le sens axial de celle-ci.
15. Dispositif selon l'une quelconque des revendications 1 à 14, caractérisé en ce que les faces antérieures du levier de réglage (3, 30) et les surfaces (51, 52) des éléments de serrage (6, 7, 16, 17) qui leur sont opposées, sont obliques pour produire une composante de force dirigée vers l'intérieur en direction du bras oscillant (1).
EP19860109364 1986-07-09 1986-07-09 Dispositif pour connecter un levier oscillant d'une ratière à un cadre d'un métier à tisser Expired - Lifetime EP0252177B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19860109364 EP0252177B1 (fr) 1986-07-09 1986-07-09 Dispositif pour connecter un levier oscillant d'une ratière à un cadre d'un métier à tisser
DE8686109364T DE3668921D1 (de) 1986-07-09 1986-07-09 Vorrichtung zum verbinden eines schwingarmes einer schaftmaschine mit einem schaft einer webmaschine.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860109364 EP0252177B1 (fr) 1986-07-09 1986-07-09 Dispositif pour connecter un levier oscillant d'une ratière à un cadre d'un métier à tisser

Publications (2)

Publication Number Publication Date
EP0252177A1 EP0252177A1 (fr) 1988-01-13
EP0252177B1 true EP0252177B1 (fr) 1990-02-07

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Application Number Title Priority Date Filing Date
EP19860109364 Expired - Lifetime EP0252177B1 (fr) 1986-07-09 1986-07-09 Dispositif pour connecter un levier oscillant d'une ratière à un cadre d'un métier à tisser

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EP (1) EP0252177B1 (fr)
DE (1) DE3668921D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1229284B (it) * 1989-04-18 1991-08-08 Nuovo Pignone Spa Leva principale per ratiera rotativa funzionante ad alta velocita'.
FR2672062B1 (fr) * 1991-01-25 1993-05-07 Staubli Sa Ets Dispositif de tirage pour la commande des cadres de lisses des mecaniques d'armure du type negatif.
EP0633335A1 (fr) * 1993-07-05 1995-01-11 Stäubli AG (Stäubli SA) (Stäubli Ltd.) Dispositif de réglage placé entre le levier oscillant d'une ratière et un cadre d'un métier à tisser
IT1271244B (it) * 1994-10-05 1997-05-27 Fimtextile Spa Testa della tiranteria di comdando dei quadri dei licci per effettuare in modo indipendente le due regolazioni rispetto alla leva di comando della macchina per la formazione del passo
IT1272875B (it) * 1995-01-10 1997-07-01 Nuovo Pignone Spa Corsoio per leva di ratiera
FR2734610B1 (fr) * 1995-05-24 1997-07-04 Staubli Sa Ets Agrafe reglable pour l'assemblage pivotant des bras oscillants d'une mecanique d'armure avec les bielles d'attaque du systeme de tirage
EP0822278A1 (fr) * 1996-07-29 1998-02-04 Sulzer Rüti Ag Dispositif pour relier une ratière avec les cadres d'un métier à tisser
IT1295386B1 (it) * 1997-10-23 1999-05-12 Fimtextile Spa Dispositivo di regolazione della testa della tiranteria di comando dei quadri dei licci in un telaio tessile

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH523989A (de) * 1970-09-25 1972-06-15 Staeubli Ag Justiereinrichtung im Verbindungsweg zwischen einer Fachbildungsvorrichtung und einem Schaft oder einer Litze
CH581722A5 (fr) * 1974-08-12 1976-11-15 Sulzer Ag
CH621159A5 (fr) * 1977-07-20 1981-01-15 Staeubli Ag
DE2826412C2 (de) * 1978-06-16 1980-04-10 Maschinenfabrik Carl Zangs Ag, 4150 Krefeld Schaftzug für eine Webmaschine

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EP0252177A1 (fr) 1988-01-13
DE3668921D1 (de) 1990-03-15

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