WO2003002443A1 - Mecanisme de va et vient pour le bobinage de fils - Google Patents
Mecanisme de va et vient pour le bobinage de fils Download PDFInfo
- Publication number
- WO2003002443A1 WO2003002443A1 PCT/FR2002/002223 FR0202223W WO03002443A1 WO 2003002443 A1 WO2003002443 A1 WO 2003002443A1 FR 0202223 W FR0202223 W FR 0202223W WO 03002443 A1 WO03002443 A1 WO 03002443A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cursor
- magnets
- coils
- coil
- magnetic field
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H54/00—Winding, coiling, or depositing filamentary material
- B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
- B65H54/28—Traversing devices; Package-shaping arrangements
- B65H54/2833—Traversing devices driven by electromagnetic means
-
- 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
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention relates to the field of winding a textile thread on a support in order to form a spool during the various stages involved in its production (spinning, drawing, texturing or any other operation), and which therefore consists of winding the wire on a support (cardboard tube, metal, etc.), said support being driven either by its axis or by pressure on a pilot member.
- the wire is distributed along a generator along the spool, either in the form of parallel rectilinear turns, or in the form of wavy turns, parallel in the same layer, but offset and crossed by a layer compared to each other.
- the speed of movement along the spool is constant, the reversal of the movement at the ends being, on the other hand, carried out as quickly as possible so that the edges of the spool are not thicker than the center of the body. winding as a result of increased wire deposition.
- the first of these families is constituted by motors of the linear type with carriage or slider, that is to say a motor which operates in a manner similar to a stepping motor unwound flat. 5
- the motor must be designed to allow a total stroke 0 at least equal to the useful stroke of the movable element which is therefore constituted by coils, while the stator is constituted by a permanent magnet.
- the attraction between the stator (magnet) and the on-board circuit is extremely strong, which would therefore require a translational guidance system capable of resisting this attraction while maintaining a constant air gap.
- the cursor carrying the wire distribution element must therefore be mounted on a carriage associated with the moving coils, which involves guiding means such as ball bearings or rollers, which therefore creates a large moving mass, limiting the acceleration performance of the system.
- the second family of conventional linear motors is that of so-called "tubular" motors.
- Such a type of tubular motor is made so that the coils and the magnetic systems are fixed, the permanent magnet being movable.
- This permanent magnet is cylindrical and can be compared to the piston or the rod of a jack.
- such a linear motor with movable permanent magnet therefore consists of a tube of material magnetized into a succession of alternating north-south poles.
- the coils and the associated magnetic forces are arranged as a stack of rings around this tube in the body of the motor.
- the motor has less force at the moment when, in the case of the winding of a wire, we need the maximum force for a rapid reversal of the movement .
- this type of cylinder must have a permanent magnet whose length is at least equal to twice the stroke.
- magnetic means making it possible to create a magnetic field around the individual means carrying wires; and - means for guiding in translation, said individual means carrying wires, conductors of electricity.
- the guide means carrying wire and conducting electricity move, up and down, at least partly under the effect of the Laplace force created by their arrangement in a magnetic field while they are crossed by an electric current flowing in said guide means.
- the wire guide elements are therefore arranged, in a similar manner, to conventional linear motors called “tubular", that is to say that they constitute in a way a jack whose rod carries at its end the guide eyelet. Consequently, as in the aforementioned case, if such an assembly were adapted to a reciprocating winding system, the control means would be arranged laterally relative to the winding means, resulting in significant lateral bulk.
- Such a device is also not transposable to a back-and-forth system for the distribution of the wire during a winding operation.
- the displacement of the depositing wire guide is carried out by means of a cursor driven linearly under the action of Laplace forces.
- the device according to the invention makes it possible to solve all the technical problems posed by such a transposition of the Laplace force system making it possible to communicate a device back and forth to an element.
- the device according to the invention is characterized in that the displacement of the depositing guide is carried out by means of a wire distributor cursor which is driven under the action of Laplace force, said cursor being traversed by an electric current flowing in a coil forming a closed circuit, said assembly being subjected to the action of the magnetic field such that the Laplace force is exerted on at least one of the sides of the conductive support carrying said guide and acts on this side while being directed perpendicular to the magnetic field created and tends to slide it along its plane in the air gap where the created magnetic field prevails.
- a magnetic field can be obtained by any suitable means, and in particular by means of fixed permanent magnets arranged opposite one another.
- the cursor has a coil connected to a power source whose current is alternately reversed in one direction and then in another, thereby creating a back and forth movement;
- the means for creating the magnetic field are constituted by a stator assembly comprising at least one elementary module comprising two pairs of permanent magnets, aligned, arranged opposite one another with opposite polarities, and defining between them a space inside which moves the electrically conductive support equipped with the wire guide, the poles of the magnets of a pair being inverted with respect to the poles of the second pair associated with it;
- the voice coil is in the form of a rectangular frame, the two longest sides of which cut the magnetic field and the width of which corresponds to the width of a magnet.
- Such a device therefore comprising at least two sets of magnets whose poles are alternated from one set to another, when one of the sides of the coil cuts the flow, it receives a Laplace force tending to move the support along the air gap and the second side, which is traversed by a current in the opposite direction and which cuts a reverse flow, therefore receives a force in the same direction as the first which is added thereto.
- the resulting force is therefore exerted over a distance (or stroke) having a length equal to the width of a magnet.
- the cursor supporting the wire guide comprises a plurality of coils offset with respect to each other.
- the other in the case of '' a two-coil system, or the other two in the case of a system with three coils, is positioned opposite the magnets and can therefore receive maximum Laplace forces.
- the electrical supply of the support or conductive frame equipped with the wire guide can therefore be carried out as well in two-phase current when said support is equipped with two coils offset by half a width of magnet, as in current three-phase with three coils offset by a third of the magnet width.
- means are provided for guiding and supplying electric current to the rectangular frame carrying the moving coil moving the cursor, as well as means for detecting the position of the cursor which supports the wire guide in order to control the reversing the current with each pass from one magnet to the next magnet and reversing the movement in a timely manner depending on the type of coil to be produced.
- FIG. 1 is a perspective view illustrating the principle of the basic structure of a back and forth mechanism allowing the removal of a wire produced in accordance with the invention
- Figure 2 is a perspective view schematically showing the structure of an elementary module necessary for the production of a device for controlling the back and forth of a wire guide;
- Figure 3 is a perspective view of a back-and-forth device comprising five juxtaposed elementary modules
- FIGS. 4 and 5 are schematic perspective views showing two embodiments of a means for guiding the wire guide in a device produced in accordance with the invention
- Figures 6, 7, 8 and 9 schematically illustrate the operating principle of a device according to the invention in which the wire guide is mounted on a slider equipped with a single coil supplied in single phase;
- FIGS. 10 and 11 are diagrams which illustrate the current supply sequence for obtaining the Laplace force, making it possible to ensure the displacement of the guide (FIG. 10), FIG. 11 illustrating the speed diagram of said cursor subjected to the force obtained as well as its reciprocating movement;
- Figures 12 and 13 schematically illustrate the operating principle of a device according to the invention in which the cursor comprises two coils offset by half a width of magnet with a two-phase current supply;
- Figures 14 and 15 illustrate the operating principle of a wire guide driven by a cursor equipped with three coils offset by a third of the width of a magnet with a three-phase current supply;
- Figures 16, 17 and 18 schematically illustrate different means for detecting the position of the wire guide element during the back-and-forth movement
- Figure 19 and Figure 20 schematically illustrate a preferred embodiment of the power supply of the movable cursor carrying the wire guide.
- the invention therefore relates to an improved device which ensures the winding, at high speed, a wire (1) on a support (2) driven in rotation, for example by contact with a drive shaft (3).
- the support (2) is mounted between the arms (4) of a fork and the wire is wound on the support (2) so as to form a winding (5) which can either be with straight sides as shown in FIG. 1, or possibly with inclined sides in the case of a conical coil. In the latter case, the slope of the sides is obtained by varying the travel of the wire guides as the winding (5) is formed.
- the distribution of the wire (1) around the support is carried out by means of a guide (6) moved in a back-and-forth movement, parallel to the surface of said support, this distribution being carried out with rapid deceleration and acceleration at the point of reversal of the back-and-forth movement.
- the displacement of the removal guide (6) is obtained by means of Laplace forces which are exerted on a coil, traversed by an electric current and which is placed in an intense magnetic field.
- the distribution guide (6) is therefore mounted on a cursor, designated by the general reference (7), a cursor which is in the form of a rectangular frame comprising two parallel sides (7a, 7b) and connected to an electrical supply (C).
- the electrical circuit extends inside the frame along the two sides (7a, 7b) and in the parts connecting these sides ( Figure 9).
- This cursor has a coil which is therefore connected to the power source (C), the current of which can be alternately reversed in one direction and then in another.
- Each elementary module (8) comprises at least two pairs of permanent magnets, designated by the same reference (9), and which are arranged opposite one another with opposite polarities, as is apparent from the appended figures which will be seen in more detail when explaining the operation of such a device.
- the displacement will therefore correspond to the width of a pair of magnets (9).
- a succession of identical modules will therefore be juxtaposed as shown in more detail in FIGS. 1 and 3 where five modules (8a-8f) are shown and a switching system making it possible to reverse the direction of the current at the moment when the coil coincides with the junction zone between the two pairs of magnets, making it possible to maintain a force always oriented in the same direction regardless of the position of said coil .
- guide means are provided for positioning said frame (7) in the median plane of the air gap.
- an elastic material such as a spring or an elastomer can be placed between the guide rails (12) and the support means (10 or 11).
- Power supply Regarding the power supply of the frame (7) it is advantageously produced by a flat cable (15) or by a printed circuit on a flexible film, of the type used in the supply of the print heads of printers. (see figures 19 and 20).
- This flat cable (15) or flexible supply circuit can be inserted inside the carcass of the block supporting the magnets (9), for example in a cavity provided at the lower part of said carcass below said magnets.
- the supply is made from two identical flat cables, arranged on either side of the slider (7), each of the flat cables bringing half of the conductors.
- Position detection To ensure the control and command of the reversal of the back-and-forth direction, means for detecting the position of the cursor which supports the wire guide are associated with the assembly conforming to the invention.
- FIGS 16, 17 and 18 illustrate three embodiments of such detection means.
- FIG. 16 illustrates an embodiment in which the detection means consist of an optical or magnetic detector (20) mounted on a cursor (7) and which is moved along a ruler (21) having marks.
- FIG. 17 schematically illustrates detection means constituted by an electric cell or a mirror (22) also mounted on the frame (7) associated with a laser sensor (23).
- such means will be constituted by one or more sensors by Hall effect probe (24), as shown in FIG. 18.
- Hall effect probes the latter are on board the cursor and deliver a signal proportional to the magnetic field to which they are subjected.
- the detection of the change of sign of the field makes it possible to detect the passage to the junction zone between two magnets.
- the use of a plurality of offset sensors makes it possible not only to detect the areas of junction between two magnets, but also to locate with precision the position of the cursor (7) by comparing the phase shift of the signals declined by each sensor.
- FIGS. 6,7,8 and 9 illustrate the principle of base with single phase supply
- Figures 10 and 1 1 are diagrams illustrating the current supply sequence, the force created, the speed of the cursor and the movement of the latter
- Figures 12 and 13 illustrate a device according to the invention powered by a two-phase current
- Figures 14 and 15 illustrate an operation with a three-phase supply
- Figures 16, 17 and 18 illustrate three ways to detect the position of the frame supporting the wire guide element, and thus control the inversion of the currents at the junction zones between two consecutive magnets and their reversal of the race
- Figures 19 and 20 illustrate in turn, schematically, the displacement of a module supplied with electricity and the manner in which this supply is produced;
- Figures 6 and 7 illustrate the basic principle of a device according to the invention.
- the device according to the invention therefore essentially comprises means making it possible to create a magnetic field, means constituted by at least two pairs of magnets designated by the same reference general (9).
- the "motor” element making it possible to ensure the displacement of the wire guide (6), therefore consists of a frame (7), the two parallel branches (7a, 7b) of which constitute a coil traversed by a current.
- the minimum stroke that can be communicated to the guide corresponds to the width of a spool (width of the frame (7)) and, consequently, the wire guide assembly according to the invention must therefore include at least two sets of magnets (9) whose width is therefore equal to the width of the coil (7).
- the voice coil in the form of a flat rectangular frame (7), as thin as possible.
- This rectangular coil is therefore placed between two rows of strong magnets (9), so that its two longest sides cut the magnetic field.
- the magnetic circuit is closed on the block (3) supporting the magnets.
- Figures 10 and 1 1 are diagrams which illustrate the principle of control of the assembly according to the invention which can therefore be defined as a linear motor with Laplace force.
- Figure 10 shows the current sequence to be sent in a coil and the resulting force.
- Figure 1 1 shows how the force thus created causes the movement back and forth.
- the marks A correspond to the instants characteristic of the inversion of the direction of movement of the cursor at the ends of the stroke.
- Al corresponds to the instant when the inversion is initiated; at this instant, the direction of the force (and therefore the current) is reversed and its intensity is greatly increased, which suddenly brakes the coil which then starts again in the opposite direction.
- A2 corresponds to the moment when, after inversion, the speed of the thread guide again reaches the desired value, defined by the crossing angle. The current is then reduced to maintain a constant speed.
- the marks B correspond to the instants when the coil is in coincidence with the junction between two magnets.
- the current is then reversed, with the same intensity, to restore the driving force in the same direction.
- the force is briefly canceled.
- the instants B of each coil are offset and fall at different places. The total force resulting from the addition of forces of each coil does not cancel and therefore remains high, the brief cancellation of the force on one of the coils then being only slightly perceptible on the total force.
- the instants A1, A2 and B are detected by sensors whose signals are injected into an electronic computer, for example based on a microprocessor, which controls the circuits which inject the appropriate currents into each of the coils.
- FIG. 11 shows how the force thus created makes it possible to obtain a speed profile, and consequently the appropriate displacement of the cursor. It should be noted that in this figure, the small variations of forces due to the coincidences of the magnets of one of the coils, are not shown.
- the mobile part (7) therefore comprises a frame equipped with two coils (C1, C2) offset by the half-width of the magnets. Consequently, when one of the coils is positioned opposite the junction zone between two consecutive magnets (9), the other is positioned in the center of the neighboring magnet and therefore ensures maximum driving force.
- Each coil receives a current controlled according to the diagram exposed above, so that when the coil (C2) is positioned opposite the junction zone, the coil (Cl) is still supplied and is opposite the center of the previous magnet. Then, when the coil (Cl) is in front of the next junction, the coil (C2) is energized and is already in front of the next magnet, and so on. Consequently, by simple switching logic, it is It is possible to create a force that never vanishes and thanks to a more sophisticated feeding device, it is possible to obtain an almost constant force.
- an assembly comprising three coils (C1, C2, C3), offset by a value equal to one third of the width of a magnet, such so that when one of the uprights of the frame is positioned at the junction between two magnets, the others are at the central parts of the magnets
- the three-phase supply can be carried out with means similar to those used to control so-called "brushless” motors.
- Such detection means can be constituted, as can be seen in FIG. 16, by an optical sensor mounted on a rule.
- FIG. 17 illustrates an embodiment in which the position of the guide is detected by means of a mirror, fixed on the mobile element, associated with a laser sensor.
- the laser system equipped with an interferometry device is mounted in the axis of longitudinal displacement of the cursor, and on the latter, is placed a mirror on which the laser beam is reflected.
- the movement of the carriage therefore scrolls through a succession of interference fringes whose counting allows instantaneous measurement of the speeds and the position of the carriage with an accuracy of a few fractions of a micron.
- Such means are, however, preferably made in the illustrated manner 18, that is to say by using one or more Hall effect probes fixed on the movable frame.
- Hall effect probes deliver a signal proportional to the magnetic fields to which they are subjected, which magnetic fields come from permanent magnets.
- the position of the linear displacement of the cursor is therefore identified by a set of sensors, optical or magnetic, which make it possible to trigger inversion cycles from sequences, and thus to vary the strokes. by time adjustments. Given the very low inertias with respect to the forces present, very good reproducibility is obtained.
- the device according to the invention can be used on all textile machines requiring the winding of a thread in the form of a spool, and whether it is on a straight or biconical side.
- the main advantages of the device according to the invention lie essentially in its lightness, its compactness, its modularity and the symmetry of the movement.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Power Engineering (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
- Control Of Linear Motors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR01/08476 | 2001-06-27 | ||
FR0108476A FR2826644A1 (fr) | 2001-06-27 | 2001-06-27 | Mecanisme de va et vient pour le bobinage de fils |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003002443A1 true WO2003002443A1 (fr) | 2003-01-09 |
Family
ID=8864832
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/002223 WO2003002443A1 (fr) | 2001-06-27 | 2002-06-27 | Mecanisme de va et vient pour le bobinage de fils |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR2826644A1 (fr) |
WO (1) | WO2003002443A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103068705A (zh) * | 2010-04-12 | 2013-04-24 | 艾格特克斯针织纺织工业有限公司 | 直接横移装置 |
CN108217321A (zh) * | 2018-03-05 | 2018-06-29 | 广东理工学院 | 弹射式导线咀总承及导线咀系统 |
IT201800006021A1 (it) * | 2018-06-08 | 2019-12-08 | Dispositivo di guida per l'applicazione di un filo e procedimento | |
IT201800006019A1 (it) * | 2018-06-08 | 2019-12-08 | Dispositivo di guida per l'applicazione di un filo e procedimento |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2888226B1 (fr) * | 2005-07-11 | 2007-12-14 | Rieter Textile Machinery Fr | Dispositif de va-et-vient a bras oscillant |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4749921A (en) * | 1986-07-21 | 1988-06-07 | Anwar Chitayat | Linear motor with non-magnetic armature |
US5075583A (en) * | 1989-04-28 | 1991-12-24 | Toyota Shatai Kabushiki Kaisha | Brushless DC linear motor |
US5588312A (en) * | 1994-12-14 | 1996-12-31 | Tsudakoma Kogyo Kabushiki Kaisha | Driving apparatus for needles of knitting machine |
DE19700392A1 (de) * | 1996-01-10 | 1997-07-17 | Schieber Universal Maschf | Antriebsvorrichtung mit mehreren flachen Linearmotoren |
DE19623771A1 (de) * | 1996-06-14 | 1997-12-18 | Schaeffler Waelzlager Kg | Changiereinrichtung |
EP0949748A1 (fr) * | 1998-04-06 | 1999-10-13 | Kollmorgen Corporation | Moteur linéaire sans encoches à hautes performances avec enroulements supportés |
WO2000024663A1 (fr) * | 1998-10-28 | 2000-05-04 | Maschinenfabrik Rieter Ag | Va-et-vient de fil |
EP1081082A2 (fr) * | 1999-09-01 | 2001-03-07 | Murata Kikai Kabushiki Kaisha | Dispositif et procédé de va-et-vient |
EP1148016A2 (fr) * | 2000-04-20 | 2001-10-24 | Berger Lahr GmbH & Co. KG | Dispositif pour enrouler un fil sur une bobine |
-
2001
- 2001-06-27 FR FR0108476A patent/FR2826644A1/fr active Pending
-
2002
- 2002-06-27 WO PCT/FR2002/002223 patent/WO2003002443A1/fr not_active Application Discontinuation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4749921A (en) * | 1986-07-21 | 1988-06-07 | Anwar Chitayat | Linear motor with non-magnetic armature |
US5075583A (en) * | 1989-04-28 | 1991-12-24 | Toyota Shatai Kabushiki Kaisha | Brushless DC linear motor |
US5588312A (en) * | 1994-12-14 | 1996-12-31 | Tsudakoma Kogyo Kabushiki Kaisha | Driving apparatus for needles of knitting machine |
DE19700392A1 (de) * | 1996-01-10 | 1997-07-17 | Schieber Universal Maschf | Antriebsvorrichtung mit mehreren flachen Linearmotoren |
DE19623771A1 (de) * | 1996-06-14 | 1997-12-18 | Schaeffler Waelzlager Kg | Changiereinrichtung |
EP0949748A1 (fr) * | 1998-04-06 | 1999-10-13 | Kollmorgen Corporation | Moteur linéaire sans encoches à hautes performances avec enroulements supportés |
WO2000024663A1 (fr) * | 1998-10-28 | 2000-05-04 | Maschinenfabrik Rieter Ag | Va-et-vient de fil |
EP1081082A2 (fr) * | 1999-09-01 | 2001-03-07 | Murata Kikai Kabushiki Kaisha | Dispositif et procédé de va-et-vient |
EP1148016A2 (fr) * | 2000-04-20 | 2001-10-24 | Berger Lahr GmbH & Co. KG | Dispositif pour enrouler un fil sur une bobine |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103068705A (zh) * | 2010-04-12 | 2013-04-24 | 艾格特克斯针织纺织工业有限公司 | 直接横移装置 |
CN108217321A (zh) * | 2018-03-05 | 2018-06-29 | 广东理工学院 | 弹射式导线咀总承及导线咀系统 |
IT201800006021A1 (it) * | 2018-06-08 | 2019-12-08 | Dispositivo di guida per l'applicazione di un filo e procedimento | |
IT201800006019A1 (it) * | 2018-06-08 | 2019-12-08 | Dispositivo di guida per l'applicazione di un filo e procedimento | |
EP3578149A1 (fr) * | 2018-06-08 | 2019-12-11 | Fameccanica.Data S.p.A. | Dispositif de guidage d'un appareil de production d'articles sanitaires pour appliquer un fil et procédé associé |
EP3578150A1 (fr) * | 2018-06-08 | 2019-12-11 | Fameccanica.Data S.p.A. | Dispositif de guidage d'un appareil de production d'articles sanitaires pour appliquer un filetage et procédé associé |
US11234869B2 (en) | 2018-06-08 | 2022-02-01 | Fameccanica.Data S.P.A. | Guiding device of an apparatus for producing sanitary articles for applying a thread, and relative method |
Also Published As
Publication number | Publication date |
---|---|
FR2826644A1 (fr) | 2003-01-03 |
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