EP1469109B9 - Embrayage à flux magnétique amélioré pour la marche lente et la recherche du pas et procédé pour sa fabrication - Google Patents

Embrayage à flux magnétique amélioré pour la marche lente et la recherche du pas et procédé pour sa fabrication Download PDF

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Publication number
EP1469109B9
EP1469109B9 EP04100257A EP04100257A EP1469109B9 EP 1469109 B9 EP1469109 B9 EP 1469109B9 EP 04100257 A EP04100257 A EP 04100257A EP 04100257 A EP04100257 A EP 04100257A EP 1469109 B9 EP1469109 B9 EP 1469109B9
Authority
EP
European Patent Office
Prior art keywords
toothing
stator
flat
disc
clutch
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
EP04100257A
Other languages
German (de)
English (en)
Other versions
EP1469109B1 (fr
EP1469109A3 (fr
EP1469109A2 (fr
Inventor
Gian Luigi Franchina
Maurizio Belingheri
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.)
Promatech SpA
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP1469109A2 publication Critical patent/EP1469109A2/fr
Publication of EP1469109A3 publication Critical patent/EP1469109A3/fr
Application granted granted Critical
Publication of EP1469109B1 publication Critical patent/EP1469109B1/fr
Publication of EP1469109B9 publication Critical patent/EP1469109B9/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/14—Driving, starting, or stopping arrangements; Automatic stop motions for reducing speed temporarily
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • D03D51/085—Extraction of defective weft

Definitions

  • the present invention relates to a slow-gear-selecting and pipk-finding clutch mechanism in a weaving loom.
  • it relates to a solenoid-controlled clutch mechanism and a manufacturing method therefor.
  • the loom is sometimes equipped with an auxiliary motor which acts - through a suitable high-reduction-ratio kinematic chain - onto the shaft of the weaving machine and/or onto the loom main shaft.
  • the auxiliary motor it is required that the auxiliary motor be engaged with the weaving machine only when the loom is running at low speed; in all other conditions of the loom the auxiliary motor should be disengaged.
  • a device for selecting a slow-running gear is provided which couples the auxiliary motor to the weaving machine and/or to the main shaft only when it is explicitly required.
  • pick-finding step The step in which, upon slow running of the loom, the relative phase between the main shaft and the weaving machine is correctly found out and established is called "pick-finding step", which shall be referred to in the following.
  • Such a clutch device is for example the one described in the Italian application Mx2000A/1157 and EP 1.245.707 , in the name of the same Applicant.
  • the mechanism comprises, amongst other things, two separate gears, with flat bevelled toothing, enclosing sandwich-wise a toothed and axially mobile disc meshing with the one or the other, according to suitable operation modes.
  • the main shaft and the weaving machine shaft are co-axial and their ends lie opposite each other.
  • Fig. 1 shows, in a cross-section, an example of prior art coupling.
  • a flat bevelled toothed stator is opposite a toothed flange integral with the weaving machine shaft; a double-sided toothed disc is suitably attached to the end of the main shaft of the weaving loom, which passes through the stator.
  • the disc is axially displaceable with respect to the shaft on which it is mounted, under the contrasting action of a membrane-and-thrust-spring assembly and of a solenoid.
  • the latter is mounted integral with the stator case and through the stator develops a magnetic field that allows it to attract the toothed disc.
  • Thrust springs are further provided, which press the toothed disc against the toothed flange, holding the coupling between the main shaft and the weaving machine.
  • fig. 1 is a cross-section view, partially interrupted, of a prior art coupling device: in the top part, with the disc shifted to the left hand side, and in the bottom part, with the disc shifted to the right hand side;
  • fig. 2 is a view similar to that of fig. 1 depicting a clutch according to the invention.
  • fig. 3 is an elevation front view of the clutch portion depicted in fig. 2 with parts partially cut out.
  • a clutch manufactured according to what has been cited before consists, in a manner known per se, of a stator 1 and of a toothed flange 2 between which a disc 3 is located.
  • the stator 1 is fixed to the loom chassis and features a flat bevelled toothing la. At the same time it features a raised perimeter edge 1b ending with a circular rim surface 1b.
  • a flat bevelled toothing 2b is further provided on a flange 2, mounted at the end of a weaving machine drive shaft .
  • the disc 3 features two series of front flat bevelled toothings: a first inner series 3a, intended to mesh with the corresponding toothing la of the stator 1, and a second outer series 3b, intended to mesh with the corresponding toothing 2b of the flange 2. Also, the disc 3 features a raised perimeter edge ending with a circular-rim surface 3b' intended to abutt with the surface 1b'.
  • the disc 3 is mounted axially translatable at the end of a shaft
  • the disc is mounted by means of membrane springs 4 and is constantly pushed to the left (with reference to the figure), i.e. meshed with the flange 2 (top part of fig. 1 ), by means of a series of springs 5, for example twelve springs arranged equally circumferentially spaced apart.
  • a coil E which acts as a solenoid is further provided to establish a magnetic field with the function of attracting to the right (with reference to the figure) the disc 3, overcoming the thrust of the springs 5, so as to cause the series of teeth 3a and la (lower part of fig. 1 ) to mesh with each other.
  • the magnetic field is essentially toroidally-shaped around the solenoid.
  • the magnetic flux is essentially circle-shaped around the solenoid E: hence it diffuses into the metallic material in a continuous way, except in the central area of the stator, i.e. at the teeth la and 3a, where - according to the prior art - a magnetic gap can be found (consisting of the clearance between the teeth) which significantly limits the effectiveness of the field.
  • a pair of contact surfaces are instead provided partially levelling off the respective toothing.
  • each tooth of the series la features a levelled-off area 1a', obtained radially outwards, which therefore creates a stubbling to the tooth la.
  • each tooth of the series 3a features a levelled-off area 3at located radially inwards, which creates another stubbling.
  • undercutting grooves S are provided at the junction between the tooth relief and the levelled-off area.
  • the two series of teeth can be drawn nearer into each other, bringing the levelled-off area la' into contact with the levelled-off ridge 3a " of the tooth 3a.
  • grinding of the surfaces 1b' and 3b' is carried out while grinding their respective toothing stubbling: by doing so, a perfect levelness is further achieved which guarantees optimal coupling.
  • a contact coupling has hence been obtained, both inwardly and outwardly, radially to the solenoid, establishing a perfectly continuous closure of the toroidal magnetic circuit and achieving the desired results.
  • the bevelled toothing can be obtained still by conventional tapping; subsequently it is possible to create the levelled-off areas la' and 3a' by mechanical machining. If carried out properly, this subsequent machining, amongst other things, may simultaneously result in an improved planarity of the contact surfaces in P, removing possible manufacturing inaccuracies which would have inevitably caused a functioning fault.
  • this method for obtaining the coupling according to the invention is applicable also to clutches already manufactured according to the prior art, thus achieving a further object of those detailed in the preamble.
  • the circumferential, perimeter portion of the teeth la on the stator 1 is removed by machining, for example by milling, obtaining a deep circumferential groove. Inside this groove, a ring is secured which represents an abutting surface against which the ridges 3a'' of the teeth 3a of the disc 3 are intended to engage, so as to achieve a similar closure of the magnetic circuit in the radially inner area. In this case too, the desired objects are fully achieved, although a different practical machining method is employed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Coating With Molten Metal (AREA)
  • Paper (AREA)
  • Characterised By The Charging Evacuation (AREA)
  • Vehicle Body Suspensions (AREA)

Claims (8)

  1. Embrayage pour une sélection de vitesse lente et une recherche de duite destiné à un métier à tisser, du type comprenant un stator (1) fixé sur le métier et une bride (2) solidaire d'un arbre entraîné, muni de dentures chanfreinées plates opposées (1a, 2b), entre lesquels un disque (3) est situé avec possibilité de rotation pour être solidaire d'un arbre d'entraînement (A), muni d'une denture chanfreinée plate correspondante (3b, 3a), pouvant exécuter une translation depuis une position d'accouplement avec ledit stator (1) à une position d'accouplement avec ladite bride (2), ledit disque pouvant être déplacé sous l'action d'une force magnétique développée par un électroaimant (E) solidaire dudit stator (1), caractérisé en ce que, au niveau de la denture (1a) dudit stator (1), une surface circonférentielle plate (1a') est prévue, de manière à définir, avec une zone aplatie (3a') dans la denture correspondante (3a) dudit disque (3) au moins une paire de surfaces d'accouplement plates (1a', 3a") prévues pour venir en contact lorsque l'électroaimant (E) est excité.
  2. Embrayage selon la revendication 1, dans lequel ladite surface circonférentielle plate (1a') consiste en une partie plate/aplanie de la denture (1a) du stator (1).
  3. Embrayage selon la revendication 2, dans lequel ladite zone aplanie est obtenue en tant que découpe de la denture (1a) du stator (1) par usinage mécanique.
  4. Embrayage selon la revendication 1, dans lequel ladite surface circonférentielle plate consiste en une surface plate d'une bague métallique appliquée.
  5. Embrayage selon l'une quelconque des revendications précédentes, dans lequel ladite surface circonférentielle plate (1a') au niveau de la denture (1a) du stator (1) est capable de s'accoupler avec la nervure aplanie (3a") de la denture (3a) dudit disque (3).
  6. Procédé de fabrication pour un embrayage destiné à la sélection d'une vitesse lente et à la recherche de duite pour un métier à tisser, comprenant les étapes consistant à :
    fournir un embrayage du type comprenant un stator (1) solidaire du métier et une bride (2) solidaire d'un arbre entraîné, muni de dentures chanfreinées plates opposées, entre lesquels un disque (3) est situé avec possibilité de rotation pour être solidaire d'un arbre d'entraînement (A) et muni d'une denture chanfreinée plate correspondante, pouvant exécuter une translation depuis une position d'accouplement avec ledit stator (1) à une position d'accouplement avec ladite bride (2), ledit disque pouvant être déplacé sous l'action d'une force magnétique développée par un électroaimant (E) solidaire dudit stator (1),
    dans lequel, en outre, ladite denture chanfreinée plate a été obtenue par usinage classique,
    caractérisé par les étapes consistant à :
    obtenir une paire de surfaces d'accouplement au niveau de ladite denture par dépouille d'au moins une partie d'au moins l'une desdites dentures par usinage mécanique, lesdites surfaces d'accouplement étant des surfaces circonférentielles plates.
  7. Procédé selon la revendication 6, dans lequel :
    la denture dudit disque (3) est au moins partiellement dépouillée par usinage mécanique, et
    la denture dudit stator est partiellement enlevée par usinage mécanique, en produisant en même temps une rainure de logement dans laquelle une bague métallique est ensuite appliquée, laquelle est capable de représenter l'une desdites surfaces d'accouplement.
  8. Procédé selon la revendication 6 ou 7, dans lequel lesdites surfaces d'accouplement sont meulées en même temps que d'autres surfaces de butée (1b', 3b') du disque et du stator, radialement opposées aux dentures par rapport à l'électroaimant (E).
EP04100257A 2003-04-18 2004-01-26 Embrayage à flux magnétique amélioré pour la marche lente et la recherche du pas et procédé pour sa fabrication Expired - Lifetime EP1469109B9 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20030817 2003-04-18
IT000817A ITMI20030817A1 (it) 2003-04-18 2003-04-18 Innesto di marcia lenta e ricerca del passo a flusso

Publications (4)

Publication Number Publication Date
EP1469109A2 EP1469109A2 (fr) 2004-10-20
EP1469109A3 EP1469109A3 (fr) 2005-03-23
EP1469109B1 EP1469109B1 (fr) 2008-09-03
EP1469109B9 true EP1469109B9 (fr) 2009-08-12

Family

ID=32894176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04100257A Expired - Lifetime EP1469109B9 (fr) 2003-04-18 2004-01-26 Embrayage à flux magnétique amélioré pour la marche lente et la recherche du pas et procédé pour sa fabrication

Country Status (5)

Country Link
EP (1) EP1469109B9 (fr)
AT (1) ATE407245T1 (fr)
DE (1) DE602004016244D1 (fr)
ES (1) ES2312923T3 (fr)
IT (1) ITMI20030817A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3224759A1 (de) * 1982-07-02 1984-01-05 Maschinenfabrik Stromag Gmbh, 4750 Unna Stirnzahnkupplung mit elektromagnetischer betaetigung
WO1986005850A1 (fr) * 1985-03-30 1986-10-09 Zahnradfabrik Friedrichshafen Ag Couplages ou freins a electro-aimant avec force de retenue modifiable electriquement
IT1317570B1 (it) * 2000-05-25 2003-07-09 Promatech Spa Gruppo di comando di un telaio di tessitura,privo di volano e frizione
EP1245707B1 (fr) * 2001-03-29 2008-11-26 Promatech S.p.A. Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser

Also Published As

Publication number Publication date
ITMI20030817A1 (it) 2004-10-19
DE602004016244D1 (de) 2008-10-16
EP1469109B1 (fr) 2008-09-03
EP1469109A3 (fr) 2005-03-23
ATE407245T1 (de) 2008-09-15
ES2312923T3 (es) 2009-03-01
EP1469109A2 (fr) 2004-10-20

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