WO1992021601A1 - Plieuse - Google Patents

Plieuse Download PDF

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Publication number
WO1992021601A1
WO1992021601A1 PCT/EP1992/001147 EP9201147W WO9221601A1 WO 1992021601 A1 WO1992021601 A1 WO 1992021601A1 EP 9201147 W EP9201147 W EP 9201147W WO 9221601 A1 WO9221601 A1 WO 9221601A1
Authority
WO
WIPO (PCT)
Prior art keywords
laying
unit
machine according
height
gear
Prior art date
Application number
PCT/EP1992/001147
Other languages
German (de)
English (en)
Inventor
Walter Wienen
Original Assignee
Krauss U. Reichert Gmbh + Co. Kg Spezialmaschinenfabrik
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 Krauss U. Reichert Gmbh + Co. Kg Spezialmaschinenfabrik filed Critical Krauss U. Reichert Gmbh + Co. Kg Spezialmaschinenfabrik
Publication of WO1992021601A1 publication Critical patent/WO1992021601A1/fr

Links

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
    • B65H45/00—Folding thin material
    • B65H45/02—Folding limp material without application of pressure to define or form crease lines
    • B65H45/06—Folding webs
    • B65H45/10—Folding webs transversely
    • B65H45/101—Folding webs transversely in combination with laying, i.e. forming a zig-zag pile
    • B65H45/103—Folding webs transversely in combination with laying, i.e. forming a zig-zag pile by a carriage which reciprocates above the laying station

Definitions

  • the invention relates to a laying machine for fabric webs, comprising a laying carriage that is movable relative to a laying table, a fabric roll storage on the laying carriage, a fabric presetting unit held on the laying carriage with a specification roller driven according to the traveling speed of the laying carriage and with a height-adjustable on the laying carriage above the laying table by means of a height distribution device held laying unit.
  • the fabric specification unit is held firmly on the spreading carriage and the fabric web usually runs vertically downwards from there into the laying unit, which can be adjusted in height above the laying table, by a constant distance between an uppermost layer of fabric of a laying package made of fabric lying on top of one another ⁇ were to be observed.
  • This construction of the laying machine has the disadvantage that the relatively long piece of fabric between the fabric specification unit and the laying unit is difficult to control in many respects, in particular if the fabric web is to be laid on the edges precisely and in particular if the laying machine is to run at high accelerations.
  • the latter already leads, for example, to the fact that the piece of fabric between the fabric specification unit already moves considerably as a result of the draft that occurs, and as a result the length of the fabric piece between the fabric specification unit and the laying unit changes constantly.
  • the invention is therefore based on the object of improving a laying machine of the generic type in such a way that a more precise laying of a fabric web is possible.
  • This object is achieved according to the invention in a laying machine of the type described at the outset in that the height setting unit is held on the laying carriage in an adjustable manner.
  • This solution according to the invention creates the possibility of shortening the length of the piece of fabric between the fabric specification text and the laying unit and thus avoiding the problems mentioned above.
  • the material specification unit can be positioned at a constant distance from the laying unit during laying. This eliminates all of the problems which have arisen in the known laying machine in that the distance between the fabric specification unit and the laying unit has changed continuously as the height of the laying unit has been adjusted, and thus also the length of the piece of fabric web extending between them. which always had to be taken into account when the fabric was applied with precise edges and the latter was laid without folds.
  • the material specification unit can be adjusted in height synchronously with the laying unit, so that in all adjustment phases there are no differences in the distance between the laying unit and the material specification unit, and thus the shortening or shortening occasionally occurring during independent adjustment
  • the fabric specification unit is relatively heavy, it is advantageously provided that the fabric specification unit is held in a height-adjustable manner by means of sliding guides on the laying carriage.
  • the structurally simplest solution for the joint adjustment of the laying unit and the material specification unit provides that the laying unit is firmly connected to the material specification unit.
  • both units could still be held on the laying carriage in such a way that they are automatically guided and held by it.
  • a simplified solution provides for the material specification unit to carry the laying unit.
  • a further advantageous embodiment of the solution according to the invention provides that the laying unit is held as an exchangeable unit on the material specification unit.
  • a flexible construction of a laying machine according to the invention is thus possible in a structurally simple manner, since only the laying unit needs to be replaced if a change is to be made to special laying methods, the replacement of the laying unit on the material specification unit being sufficient for this.
  • the fabric presetting unit by means of a gear unit firmly held on the laying carriage and one between the latter and the mechanical connection gear unit arranged on the fabric specification unit, the mechanical connection gear unit producing a mechanically rigid coupling between the gear unit fixedly arranged on the laying carriage and the material specification unit which is height-adjustable relative to the laying carriage.
  • Such a connecting gear unit could be constructed in a wide variety of ways.
  • a belt drive with at least one tensioning roller for the endless drive belt would be conceivable.
  • this has the disadvantage that a height adjustment of the fabric presetting unit would result in a rotation of the presetting roller due to the rolling of the belt wheel driving this on the belt.
  • the connecting gear unit is a Schmidt clutch, since this does not lead to a rotation of the input roller when the material input unit is adjusted in height.
  • a Schmidt clutch comprises a first and second clutch disk and a middle disk arranged between them, the first and the second clutch disk each with the middle disk over three at an angle of 120 ° on the clutch disks and the middle disk attacking handlebars are connected.
  • a gear unit is sufficient which establishes a connection between a travel drive for the laying wagon and the connecting gear unit and thereby carries out the necessary speed adjustment and in particular ensures that the input roller is always driven in the same direction.
  • the gear unit has a gear stage with a continuously variable transmission ratio
  • the transmission ratio between the drive for the laying carriage and the specification roller should always be constant, but this is practically due to slippage and different lengths of the fabric is not the case, so that it is advantageous to be able to change this transmission ratio continuously.
  • An example of such a previously known transmission stage with a continuously variable transmission ratio provides a belt drive with two pairs of conical pulleys facing one another as pulleys, the belt running depending on the desired transmission ratio at a different radial distance from an axis of rotation of the conical pulleys.
  • this has the disadvantage that the transmission ratio changes when the belt wears down, since the distance between the conical pulleys must always be fixed.
  • the gear stage has two conical disks arranged facing each other as the first gearwheel and a wedge profile wheel running between these conical disks as the second gearwheel, the distance between the axes of rotation of the gearwheels being continuously variable and definable.
  • an adjusting device which defines the distance between the axes of rotation is preferably provided, with which either both gear wheels or one of the same can be moved and fixed relative to the other.
  • Keil ⁇ profile wheel is engaged with a drive gear mounted in the frame of the gear unit and is mounted on a rocker which can be pivoted about an axis of rotation of this drive gear.
  • the distance between the gear wheels is expediently variable by pivoting the rocker arm, the spline gear always remaining in engagement with the drive gearwheel when the rocker arm is pivoted.
  • an adjusting device for pivoting and locking the rocker is preferably provided.
  • the spline wheel carries a spline ring on its opposite end faces.
  • This spline ring is preferably made of plastic.
  • the spline gear preferably has a toothing on its outer casing, with which it is in engagement with the drive gear.
  • the height distribution device has a compensating device which essentially compensates for the effect of gravity due to the height-adjustable masses. This has in particular in the case of a motor vehicle equipped with a
  • the advantage of a height-adjustable device that can be adjusted via a control is that the drive motor is not constantly loaded by a torque resulting from the effect of gravity, but that the drive motor is only used to accelerate the height-adjustable masses.
  • the compensating device is preferably designed in such a way that it has a compensating element with a flat force-displacement characteristic, so that this compensating element acts with the same force in all height positions and thus essentially compensates for the gravitational force which is also constant in all height positions.
  • the compensation element is a gas spring.
  • the height distribution device acts on the fabric control unit and thus the height of the fabric control ⁇ unit is adjustable so that the height of the laying unit carried by the fabric specification unit is inevitable.
  • Figure 1 is a schematic perspective side view of an embodiment of the laying machine according to the invention.
  • FIG. 2 shows a section along line 2-2 in FIG. 1;
  • Fig. 3 is a section along line 3-3 in Fig. 2;
  • Fig. 4 is a section along line 4-4 in Fig. 2;
  • FIG. 5 shows a partial perspective side view of the laying machine in the area of the fabric specification unit when there is no laying unit
  • Fig. 6 is a section along line 6-6 in Fig. 5 and
  • FIG. 7 shows a section along line 7-7 in FIG. 6.
  • An embodiment of a laying machine according to the invention designated 10 as a whole in FIG. 1, comprises a laying carriage 18 which can be moved on a laying table 12 in a laying direction 16 parallel to a table surface 14, this laying carriage 18 preferably having rollers 20 runs on a rail 22 held on the laying table 12.
  • the laying carriage 18 comprises a laying carriage frame 24, which has a fabric roll support 26 on an upper side, which in turn carries a fabric roll 28 with a fabric web 30 to be laid out.
  • the fabric roll carrier 26 is preferably rotatable relative to the laying carriage frame 24 about a vertical central axis 32.
  • the fabric web 30 drawn off from the fabric roll 28 runs over a deflection roller 34, which is still rotatably mounted on the fabric roll carrier 26, and then into a fabric presetting unit, designated as a whole as 36, in which the fabric web 30 via a wrapping roller 38 and a specification roller 40 S-shaped, wherein this default roller 40 is driven via a connecting gear unit 42 and a gear unit 44 held on the laying carriage in accordance with the speed of the laying carriage 18 in the laying direction 16.
  • a drive designated as a whole with 46 is provided, which on the one hand the rollers 20 and on the other hand the gear unit 44, for example via belt drives 48 or 50, drives.
  • the material web 30 runs into a laying unit, designated as a whole by 52, which has, for example, a laying shovel 54 with which the material web 30 falling from the input roller 40 is deflected and on the table surface 14 in Form of a layer 56 is designed, wherein several layers 56 are placed one on top of the other and form a layer package 58.
  • a knife box 60 is provided, which can be moved in a transverse direction 62 running parallel to the table surface 14, but perpendicular to the laying direction 16, about the fabric web 30 transversely to its default direction 64, in which it extends from the laying shovel 54 runs out on the laying table 12 to be separated.
  • the fabric specification unit 36 on the laying carriage frame 24 can be adjusted in height by means of two guides 68, which are spaced in the transverse direction 64 and are preferably arranged on the outside 66 of the fabric specification unit 36, in a vertical position on the table surface 14 Height direction 70 slidably leads.
  • the guides 68 have two ones, for example.
  • Guide rails 72 forming guide grooves 74, which are held on the laying carriage frame 24 and two guide rollers 76 running in each guide groove 72, which are held on the material specification unit 36.
  • two lifting chains 80 are provided in the transverse direction 62 at a distance from one another, preferably in the region of the guides 68, each of which starting from the material specification unit 36, with which they are firmly connected, run away from the table surface 14 parallel to the height direction 70, there via a deflection roller 82 to a drive wheel 84 and from there downwards via two deflection rollers 86 and 88 , wherein the guide roller 88 is arranged vertically below the guide roller 82, so that each lifting chain 80 from the guide roller 88 in turn to The material specification unit 36 runs with which it is firmly connected.
  • Each of the lifting chains 80 thus runs as a closed strand in a plane parallel to the laying direction 16 and height direction 70, the deflection rollers 82, 86 and 88 being each rotatably arranged on the laying carriage frame 24.
  • the two drive wheels 84 for the two lifting chains 80 are held firmly on a drive shaft 90, which is also rotatably mounted on the laying carriage frame 24 and extends parallel to the transverse direction 62 over the width of the laying carriage frame 24, the drive shaft 90 being lifted and lowered by a geared motor 92 the material specification unit 36 can be driven.
  • the gear motor 92, the drive shaft 90, the drive wheels 84 and the lifting chains 80 form a common drive train 94 for raising and lowering the material specification unit 36.
  • a traction cable 98 can be wound, which is fastened with a cable end 100 to a transmission lever 102, which with its end opposite an attachment point of the cable end 100 rotates about a pivot point 104 a frame cross strut 106 is mounted, which extends parallel to the transverse direction 62 in the laying carriage frame 24.
  • a pull rod 108 of a gas spring 110 acts on this transmission lever 102, namely between the fastening point of the rope end 100 and the pivot point 104 thereof, the gas spring with its housing 112 being held on a holding lever 114 which on the one hand on the frame cross strut 106 and on the other hand on another frame cross strut 116, which is parallel to the frame cross strut 106 extends, is held, wherein the gas spring 110 is located between the two frame cross members 106 and 116, and preferably extends parallel to them and is thereby located between the holding lever 114 and the transmission lever 102.
  • the gas spring 110 is mounted with a pretension, so that a pretension translated in accordance with the translation ratios in the transmission lever 102 also acts on the traction cable and the traction cable in turn via the cable drum 96 rotates the prestress of the gas spring with the corresponding transmission ratios ⁇ applies torque to the drive shaft 90, which is directed counter to a torque which acts on the drive shaft 90 through the mass of the material specification unit 36 and the laying unit 52.
  • the effect of gravity is thus substantially balanced, so that the gear motor 92 is no longer constantly loaded by the action of the masses of the material specification unit 36 and the laying unit 52, but rather its force only for accelerating the material specification unit 36 and the laying unit 52 in the vertical direction 70 is required.
  • the laying unit 52 is in turn not held or guided on the laying carriage frame 24, but rather on the fabric specification unit 36 as an interchangeable unit, for example by plug pins 122 of the laying unit 52 engaging in bores 120 on the material specification unit 36. fixed.
  • the feed roller 40 is driven via a pinion 124 seated on the feed roller 40, which is driven by a drive pinion 126 which is also rotatably mounted on the fabric feed unit 36.
  • the drive pinion 126 is in turn driven by the connection gear unit designated as a whole by 42, which in the exemplary embodiment shown in FIG. 5 is designed as a Schmidt clutch, which has a first clutch disk 128 driven by the gear unit 44, which in turn via ⁇ a total of three links 130 drives a central disc 132, the central disc 132 rotating about an axis 134 which is offset parallel to an axis of rotation 136 of the first clutch disc 128.
  • the middle disk 132 in turn drives a second clutch disk 142 via three links 140, which is also offset in parallel with its axis of rotation 144 both with respect to the axis of rotation 136 and with respect to the axis of rotation 134.
  • the axis of rotation 134 coincides with the axis of rotation of the drive pinion 126.
  • the second clutch disk 142 is preferably seated on the drive pinion 126.
  • the structure of the gear unit 44 is illustrated in detail in FIG. 5 and additionally in FIGS. 6 and 7.
  • the gear unit 44 comprises two toothed belt wheels 146 and 148 which, as shown in FIG. 1, are driven by the two belt drives 50.
  • the two toothed belt wheels 146 and 148 sit on a common drive shaft 150 and are each connected to this drive shaft via a freewheel, the two freewheels of the two toothed belt wheels 146 and 148 acting in the opposite direction, so that regardless of the direction of rotation of the belt drives 50 Drive shaft 150 is always driven in the same direction.
  • This drive shaft 150 is rotatably mounted in a gear housing 152 of the gear unit 44 and in turn carries a drive gear 154 which is rotatable about an axis of rotation 156 common to the drive shaft 150.
  • This drive gear 154 is in engagement with a toothing 158 which forms an outer casing of a spline gear 160.
  • This spline wheel is in turn rotatably mounted on a rocker 162, which in turn is rotatably seated on the drive shaft 150 and is thus pivotable about the axis of rotation 156 of the drive gear 154 and the drive shaft 150 together with the spline wheel 160 rotatably mounted on the rocker 162, so that the toothing 158 of the spline gear 160 always remains in engagement with the drive gear 154 in all pivot positions.
  • an output shaft 164 is rotatably mounted in the gear housing 152 above the drive shaft 150, the output shaft 164 being rotatably and non-rotatably connected to the first clutch disc 128.
  • the conical disks 170 and 172 are urged towards one another by coil spring sets 174 and 176, which are supported on the one hand in spring housings 178 and 180 which are immovable and non-rotatably on the output shaft 164 in the direction of the axis of rotation 136 and on the other hand the conical disks 170 and 172 on their conical surfaces 166 and 168 facing away from the rear ⁇ pages 182 and 184 act so that the conical surfaces 166 and 168 have a tendency to move towards each other due to the action of the coil spring sets 174 and 176.
  • the spline wheel 160 now engages, which on opposite end faces 188 and 190 each carries a recessed spline ring 192 or 194, which is made of plastic material and which on the conical surfaces 166 and 168 comes into contact and, depending on the distance of an axis of rotation 196 of the spline gear 160 from the axis of rotation 136, more or less pushes the conical disks 170 and 172 apart against the action of the spiral spring sets 174 and 176, thereby continuously varying the transmission ratio between the spline gear 160 and the Output gear 186 allowed.
  • a link 198 acts in an articulated manner on the rocker 162, which in turn is articulated on a spindle nut 200 of an adjusting spindle 202, the adjusting spindle being shown in the exemplary embodiment shown parallel to the axis of rotation 196 in the Transmission housing 152 extends.
  • the rocker 162 is pivoted more or less about the axis of rotation 156 of the drive shaft 150 and thus the distance between the axis of rotation 196 and the axis of rotation 136 is fixed.
  • the adjusting spindle 202 is preferably adjustable by means of an adjusting wheel 204, but an actuator can also be provided instead of the adjusting wheel.
  • the gear unit 44 described is driven by the two belt drives 50, so that - as already explained - the drive shaft 150 is always driven in the same direction, with a strict correlation to the speed of the laying carriage 18, since the Belt drive 50 is rigidly coupled to drive 46 and thus there is a rigid correlation between the speed of the laying carriage 18 and the speed of the drive shaft 150.
  • This drive shaft 150 likewise drives the drive gear 154, which is firmly connected to it, and this, in turn, drives the spline gear 160 via the toothing 158.
  • the spline gear 160 is thus also rigidly correlated with the speed of the laying carriage 18 with regard to its speed. Due to the continuously variable distance between the axis of rotation 196 of the spline gear 160 and the axis of rotation 136 of the driven gear 186, however, a gear ratio between the splined gear 160 and the driven gear 186 is variably adjustable, so that the Speed of the output gear 186 can vary.
  • the connecting gear unit 42 is then driven via the driven gear 186, which in turn then drives the pre-setting roller 40, the speed of the pre-setting roller 40 still being correlated with the travel speed of the laying wagon 18, but the transmission ratio through the gear ratio between the spline gear 160 and the Output gear 186 is adjustable.
  • connection gear unit 42 Due to the design of the connection gear unit 42 as a Schmidt clutch, despite the gear unit 44 fixedly arranged on the laying carriage frame 24, a movement of the material specification unit 36 in the height direction 70 is possible, although a mechanically rigid drive from the gear unit 44 via the connection gear unit 42 , designed as a Schmidt coupling, is guaranteed.
  • the up and down movement of the material specification unit 36 is possible via the geared motor 92, which drives the drive shaft 90 in the respective direction and thus moves the material specification unit 36 to the desired height above the table surface 14 via the lifting chains 80.
  • the laying machine 10 is preferably provided with a controller 210, which controls both the drive 46 and the height of the material specification unit 36 by controlling the drive 46 or the gear motor 92.
  • the drive train 94 is no longer loaded with the mass of the material specification unit 36 and the laying unit 52, but rather due to a compensation device 118, formed from the gas spring 110, the Gear lever 102, the pull rope 98 and the rope drum 96, is relieved, since this essentially compensates for the torque acting on the drive train 94 from the force of gravity of the material specification unit 36 and the laying unit 52, the torque of the geared motor 92 is only necessary to the material specification unit 36 together with the laying unit 52 to accelerate in the height direction 70, the gravity effect of the material specification unit 36 and the laying unit 52 being able to be compensated for by the essentially flat force-displacement characteristic of the gas spring 110 over the entire adjustment path in the height direction 70.
  • the diameter of the cable drum 96 is preferably slightly larger than the diameter of the drive wheel 84, so that the traction cable 98 travels a slightly larger distance than the material specification unit 36 in the height direction 70.

Landscapes

  • Treatment Of Fiber Materials (AREA)

Abstract

Plieuse pour nappes de tissu comportant un chariot de pliage déplaçable par rapport à une table de pliage, un logement de rouleau d'étoffe situé sur le chariot de pliage, une unité d'avance d'étoffe située sur le chariot de pliage avec un cylindre d'avance entraîné suivant la vitesse de déplacement du chariot de pliage, ainsi qu'un groupe de pliage placé au-dessus de la table de pliage et réglable en hauteur au moyen d'un réglage en hauteur. Afin d'améliorer la plieuse de façon à rendre le pliage d'une nappe de tissu plus précis, il est proposé que l'unité d'avance d'étoffe soit réglable en hauteur sur le chariot de pliage.
PCT/EP1992/001147 1991-06-01 1992-05-22 Plieuse WO1992021601A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4118086.0 1991-06-01
DE19914118086 DE4118086A1 (de) 1991-06-01 1991-06-01 Legemaschine

Publications (1)

Publication Number Publication Date
WO1992021601A1 true WO1992021601A1 (fr) 1992-12-10

Family

ID=6433031

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/001147 WO1992021601A1 (fr) 1991-06-01 1992-05-22 Plieuse

Country Status (3)

Country Link
EP (1) EP0541746A1 (fr)
DE (1) DE4118086A1 (fr)
WO (1) WO1992021601A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113044633A (zh) * 2021-04-16 2021-06-29 安正时尚集团股份有限公司 一种耐水洗棉毛双层复合面料生产工艺及其生产装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115092735A (zh) * 2022-07-22 2022-09-23 安徽迈德普斯医疗科技有限公司 一种生产防护服用绕卷装置及其使用方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921786A (en) * 1953-03-09 1960-01-19 Cutting Room Appliances Corp Cloth spreading machines
US3233488A (en) * 1958-11-26 1966-02-08 Cutting Room Appliances Corp Turntable cutting machines
DE7312182U (fr) * 1973-07-05 Stumpf G
DE3218484A1 (de) * 1982-05-15 1983-11-24 Krauss U. Reichert Gmbh + Co Kg Spezialmaschinenfabrik, 7012 Fellbach Legemaschine
US4477065A (en) * 1983-09-19 1984-10-16 Cutters Exchange, Inc. Belt feed apparatus for cloth spreading machine
EP0342263A1 (fr) * 1988-05-18 1989-11-23 Krauss u. Reichert GmbH + Co. KG Spezialmaschinenfabrik Matelasseuse avec des surfaces de guidage pour le tissu

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5851742A (ja) * 1981-09-22 1983-03-26 関西電力株式会社 交直変換装置の起動装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7312182U (fr) * 1973-07-05 Stumpf G
US2921786A (en) * 1953-03-09 1960-01-19 Cutting Room Appliances Corp Cloth spreading machines
US3233488A (en) * 1958-11-26 1966-02-08 Cutting Room Appliances Corp Turntable cutting machines
DE3218484A1 (de) * 1982-05-15 1983-11-24 Krauss U. Reichert Gmbh + Co Kg Spezialmaschinenfabrik, 7012 Fellbach Legemaschine
US4477065A (en) * 1983-09-19 1984-10-16 Cutters Exchange, Inc. Belt feed apparatus for cloth spreading machine
EP0342263A1 (fr) * 1988-05-18 1989-11-23 Krauss u. Reichert GmbH + Co. KG Spezialmaschinenfabrik Matelasseuse avec des surfaces de guidage pour le tissu

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113044633A (zh) * 2021-04-16 2021-06-29 安正时尚集团股份有限公司 一种耐水洗棉毛双层复合面料生产工艺及其生产装置

Also Published As

Publication number Publication date
DE4118086A1 (de) 1992-12-03
EP0541746A1 (fr) 1993-05-19

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