EP0768403A1 - Ratière avec cames corrélées et superposées pour l'entraînement desmodromique de métiers à tisser - Google Patents

Ratière avec cames corrélées et superposées pour l'entraînement desmodromique de métiers à tisser Download PDF

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Publication number
EP0768403A1
EP0768403A1 EP96202811A EP96202811A EP0768403A1 EP 0768403 A1 EP0768403 A1 EP 0768403A1 EP 96202811 A EP96202811 A EP 96202811A EP 96202811 A EP96202811 A EP 96202811A EP 0768403 A1 EP0768403 A1 EP 0768403A1
Authority
EP
European Patent Office
Prior art keywords
wheels
cam
rocker arm
wheel
cams
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.)
Granted
Application number
EP96202811A
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German (de)
English (en)
Other versions
EP0768403B1 (fr
Inventor
Giovanni Beretta
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.)
BREVTEX SA
Original Assignee
BREVTEX SA
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Filing date
Publication date
Application filed by BREVTEX SA filed Critical BREVTEX SA
Publication of EP0768403A1 publication Critical patent/EP0768403A1/fr
Application granted granted Critical
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
    • D03C5/005—Leveling mechanisms
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
    • D03C5/02—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices operated by rotating cams
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
    • D03C5/02—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices operated by rotating cams
    • D03C5/04—Construction or shape of cams

Definitions

  • the present invention relates to a dobby for the desmodromic operation of warp frames in weaving looms in which the rocker arms operating the arms of the frames are moved by series of cams of varying profile, one having smaller dimensions than the other one, which are superimposed on one another in the axial direction and act on wheels rigidly connected to said rocker arms and lying in staggered planes, the locus of the points described by the smaller cam always being contained within the locus of the points described by the larger cam.
  • Hitherto machines known as "dobbies”
  • dobbies have been produced for the control of said alternating movement, said machines using cams which are correlated and arranged alongside or facing each other, with the cam follower consisting of opposition wheels and rocker arms connected to the lever mechanism for operation of the frame.
  • These dobbies have some major drawbacks: in fact those dobbies which are based on cams arranged alongside one another have a lower supportable load level since they use only partly the axial space theoretically available for wheel/cam contact. This is due to the fact that in said axial space it is necessary to house the elements for lateral supporting of the wheel hub; moreover, said machines require particular profiles or grids for transverse centring of the wheels with respect to the cams themselves.
  • the technical problem of the invention is therefore that of providing a dobby for the positive operation, in both directions, of warp frames of weaving machines, whereby, with the minimum axial space occupied, it is possible to use the maximum width of contact between wheel and cam and achieve perfect centring thereof, without the need for additional auxiliary elements or special profiles of the contact surfaces.
  • a dobby for the desmodromic operation of warp frames in weaving looms comprising a plurality of coaxial cams which are coupled together in pairs and correlated for the positive operation, in both directions, of the lever mechanisms for operation of the frames of weaving looms, in which each pair of cams superimposed in the axial direction consists of a cam, the dimensional profile of which is always contained within the dimensional profile of the second cam of the pair.
  • each cam pair is associated with a pair of wheels of different diameter, which are rotationally rigid with the opposite faces of the rocker arm operating the arms of the frames so that each cam of smaller dimensions is associated with the wheel of larger diameter and each cam of larger dimensions is associated with the wheel of smaller diameter.
  • each pair of cams is respectively associated with a pair of wheels which are rigidly connected to a rocker arm operating the arms of the frames and are arranged partially superimposed on one another in the axial direction, said wheels having an eccentric hole for coupling with a pin which is located inside the area where the said wheels are superimposed and on which the rocker arm is also pivotably mounted.
  • the positive dobby 1 with cams for operation of frames 2 of weaving machines essentially comprises a first shaft 3 which has coaxially keyed onto it pairs of cams 4 and 5 with a correlated profile which rotate together with the shaft 3, and a pin 6 which has mounted on it the rocker arms 7 for operating the lever mechanisms 2a of the frames 2 to which they are connected via the pin 7a.
  • each rocker arm 7 has a bottom shaped part 7b, which has formed in it the hole 7c for keying onto the shaft 6.
  • Each of the opposite faces of the shaped rocker-arm part 7b has moreover formed in it an inset circular seat 7d and 7f with respectively a smaller and larger diameter for partially containing corresponding wheels 8 and 9 of different diameter.
  • Said wheels 8 and 9 are respectively formed by a hub 8a, 9a, rigidly connected to the rocker arm itself, about which there rotates, by means of barrel rollers or spheres or bushes 8b, 9b, an external ring 8c, 9c having its axis of rotation at 8d, 9d coinciding with that of the hub.
  • the wheels 8 and 9 are located in different planes and may therefore be actuated by a respective cam of each pair of cams 4 and 5.
  • the cam 4 has a profile of smaller dimensions than the profile of the cam 5 and, during rotation, the locus of the points described by the profile of the smaller cam 4 is always contained within the locus of the points described by the profile of the larger cam 5.
  • cams and wheels (Fig. 6) is such that the cam 4 of smaller dimensions is always and solely associated with the wheel 9 of larger diameter and the cam 5 of larger dimensions is always and solely associated with the wheel 8 of smaller diameter.
  • the wheels 8 and 9 could also have the same diameter, it being sufficient in this case to provide a corresponding seat on the rocker arm for both the wheels.
  • FIGS 8 to 13 show a second embodiment of the dobby according to the invention, in which the rocker arm 207 is obtained by means of two shaped profiles 207b and 207c which are bonded together; each of them has a portion 307b,307c connected to the hubs of the wheels 208,209 by welding or bonding and/or by means of the rivets 214.
  • each shaped profile 207b,207c forming the rocker arm 207 lies on the same plane as the wheel 209,208 of the other opposite supporting profile 207c,207b.
  • Each wheel 208,209 is also provided, inside its hub 208a,209a, with an eccentric hole 208e,209e for mounting onto the said pin 6 for pivoting of the rocker arm.
  • the arrangement of the wheels is such that each of them makes frictional - or revolving - contact with the respective lower rocker-arm part 207 and each wheel is partially superimposed on the other wheel in the region of engagement with the pin 6, so that the external profile of one 208 of the two wheels 208,209 comes into contact with the external profile of one 204 of the two actuating cams of each pair 204,205, while the other wheel 209 comes into contact with the external profile of the other cam 205 of the same pair 204,205.
  • Rotation of the correlated cams 204,205 thus causes rotation of the wheels 208,209 and the consequent pivoting of the rocker arm 207 about the pin 6 so as to pass from a position (Fig. 11) where the frame is lowered to a position (Fig. 12) where the frame is raised.
  • each wheel 208 is guided axially by the lateral surfaces of the two faces of the larger cams 205 which retain it axially.
  • the wheel 209 making contact with the larger cam 205 is in turn guided by its own rocker arm 207, on the one hand, and by the next rocker arm in the axial direction, on the other hand.
  • one wheel 208 of each pair 208,209 has a shaped recess 212a coaxial with an identical shaped recess 212 formed on the corresponding rocker arm 207 and suitably shaped for coupling with an associated eccentric shaft 213 which passes throught it and which is actuated only after stoppage of the loom and removal, via known systems, of the shaft 3 with respect to the shaft 6.
  • the hubs of the wheels 208,209 are fixed to the rocker arm 207 over the surface of contact between hub and rocker arm and that each hub is fixed to the other hub of the same rocker arm over the entire surface of contact between the two hubs and the assembly is such that the axial dimension of the part of the lever of the rocker arm 207 connected to the pin 207a does not have any effect on the axial width which can be used for the wheel/cam contact.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP96202811A 1995-10-11 1996-10-09 Ratière avec cames corrélées et superposées pour l'entraínement desmodromique de métiers à tisser Expired - Lifetime EP0768403B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI952070 1995-10-11
IT95MI002070A IT1276912B1 (it) 1995-10-11 1995-10-11 Ratiera a camme coniugate sovrapposte per l'azionamento desmodromico di telai tessili

Publications (2)

Publication Number Publication Date
EP0768403A1 true EP0768403A1 (fr) 1997-04-16
EP0768403B1 EP0768403B1 (fr) 2000-05-03

Family

ID=11372334

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96202811A Expired - Lifetime EP0768403B1 (fr) 1995-10-11 1996-10-09 Ratière avec cames corrélées et superposées pour l'entraínement desmodromique de métiers à tisser

Country Status (3)

Country Link
EP (1) EP0768403B1 (fr)
DE (1) DE69608064T2 (fr)
IT (1) IT1276912B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007096129A1 (fr) * 2006-02-20 2007-08-30 Picanol N.V. Procede d'entrainement de cadres de lisse et de machine à tisser
EP1975292A1 (fr) * 2007-03-28 2008-10-01 Groz-Beckert KG Disque à came pour un dispositif de formation de la foule d'un métier à tisser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH260546A (fr) * 1940-12-03 1949-03-31 Metapic Holding Dispositif de commande des cadres de lisses d'un métier à tisser.
FR2280730A1 (fr) * 1974-07-30 1976-02-27 Sulzer Ag Mecanisme a excentriques de commande des lames d'une machine a tisser
FR2317395A1 (fr) * 1975-07-10 1977-02-04 Albatex Ag Machine d'armure a commandes desmodromiques avec excentriques a ecartement reduit pour la commande des lisses, en particulier pour metiers a tisser a grande vitesse
DE9101155U1 (fr) * 1990-02-02 1991-04-25 Societe Anonyme Des Etablissements Staubli (France), Faverges, Haute-Savoie, Fr

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH260546A (fr) * 1940-12-03 1949-03-31 Metapic Holding Dispositif de commande des cadres de lisses d'un métier à tisser.
FR2280730A1 (fr) * 1974-07-30 1976-02-27 Sulzer Ag Mecanisme a excentriques de commande des lames d'une machine a tisser
FR2317395A1 (fr) * 1975-07-10 1977-02-04 Albatex Ag Machine d'armure a commandes desmodromiques avec excentriques a ecartement reduit pour la commande des lisses, en particulier pour metiers a tisser a grande vitesse
DE9101155U1 (fr) * 1990-02-02 1991-04-25 Societe Anonyme Des Etablissements Staubli (France), Faverges, Haute-Savoie, Fr

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007096129A1 (fr) * 2006-02-20 2007-08-30 Picanol N.V. Procede d'entrainement de cadres de lisse et de machine à tisser
BE1017000A3 (nl) * 2006-02-20 2007-11-06 Picanol Nv Werkwijze voor het aandrijven van weefkaders en weefmachine.
EP1975292A1 (fr) * 2007-03-28 2008-10-01 Groz-Beckert KG Disque à came pour un dispositif de formation de la foule d'un métier à tisser

Also Published As

Publication number Publication date
DE69608064T2 (de) 2000-09-28
DE69608064D1 (de) 2000-06-08
EP0768403B1 (fr) 2000-05-03
IT1276912B1 (it) 1997-11-03
ITMI952070A1 (it) 1997-04-11
ITMI952070A0 (fr) 1995-10-11

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