EP0768402B1 - Dispositif pour programmer les ratières rotatives dans les métiers à tisser - Google Patents

Dispositif pour programmer les ratières rotatives dans les métiers à tisser Download PDF

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Publication number
EP0768402B1
EP0768402B1 EP96115972A EP96115972A EP0768402B1 EP 0768402 B1 EP0768402 B1 EP 0768402B1 EP 96115972 A EP96115972 A EP 96115972A EP 96115972 A EP96115972 A EP 96115972A EP 0768402 B1 EP0768402 B1 EP 0768402B1
Authority
EP
European Patent Office
Prior art keywords
lever
spring
dobby
tooth
action
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
EP96115972A
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German (de)
English (en)
Other versions
EP0768402A1 (fr
Inventor
Gian Luigi Cremonesi
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FIMTEXTILE SpA
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FIMTEXTILE SpA
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Publication of EP0768402A1 publication Critical patent/EP0768402A1/fr
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Anticipated expiration legal-status Critical
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies

Definitions

  • the present invention concerns a device for programming rotary dobbies to operate the heald frames in weaving machines.
  • the positioning of the heald frames which determine the weft pattern of the finished fabric should be programmed according to a preset sequence, apt to establish the position which each frame should take up at each rotation of the main shaft, which issues the controls to the oscillating devices operating such frames, in order to place them in one of the two required - high or low - positions.
  • the control device should, in correspondence of each pause of said shaft, be apt to connect, or not connect, the rotation shaft to a cam or similar device operating the linkages moving the frames, and thereby determine, in one case, the change of position of said frames and, in the other case, keep said frames in the previous position.
  • the dobbies operating the heald frames in looms should thus be controlled by means of special devices apt to carry out the programming thereof, such devices allowing to determine, by way of suitable actuators, the change of the respective positions of the control means which, in turn, change the position of the frames.
  • the technical problem having to be faced is to thus realize a device for programming dobbies - particularly rotary dobbies to operate the heald frames in weaving machines - which allows to select the position of the heald frames, without stopping the rotation of the main shaft at each half turn, and which allows an independent selection of the frames for the clockwise rotation and, respectively, the anticlockwise rotation.
  • Such a device is also required to impart a reduced stress on the warp yarns and to reduce stresses and efforts in the dobby members, so as to allow very high working speeds and thereby reach the lowest possible power consumption.
  • the present invention relates to a device for programming rotary dobbies to operate the heald frames in weaving machines, said dobbies being of the type wherein the rods to control the heald frames are operated by connecting rods, each mounted onto an eccentric ring rotating in respect of the main dobby shaft, the dobby also including a disk caused to rotate by said shaft and a selection lever pivoted on said eccentric ring and apt to engage said disk with a tooth end thereof, under the action of a spring, said device comprising a control lever rotating about a fixed fulcrum under the action of thrust means and in opposition to return spring means, so that projecting end profiles of said control lever may take up a position along or, alternatively, beyond the trajectory of the end of said selection lever opposite to its tooth end, in order to cause or, alternatively, prevent the engagement of said lever with the rotating disk, the rotation of the control lever taking place during the rotation of the main dobby shaft.
  • said device is characterized in that one of the projecting end profiles of said control lever is formed with a tooth, pivoted at the corresponding end of said lever into a slot having two divergent abutting walls, and kept in contact with one of said walls by a spring so as to be able to oscillate up to contacting the other wall, in order to shift the positive engagement with said selection lever in the condition of reverse movement of the dobby.
  • the spring acting on the selection lever and the spring acting on the tooth profile of the control lever are suitably dimensioned, so that the action of the first spring may not be overcome by the action of the second spring.
  • the device of the present invention forms part of a dobby, which comprises a rotation shaft 1, onto which there is keyed a connecting rod 2 comprising a projecting part 2A, pivoted in 3A to the rod 3 controlling the heald frames (not shown), and a substantially circular ring 2B carrying two rollers 2C in opposite positions.
  • a bearing 4 is inserted at the centre of the connecting rod 2, onto the inner race of said bearing there being mounted an eccentric ring 5 apt to rotate in respect of the shaft 1, as will be seen hereinafter.
  • a rocking lever 7, or selection lever, is mounted oscillating on the eccentric ring 5 by means of a pivot 6 or like, said lever 7 having shaped ends 8 and 9 as well as a tooth 11 on its inward side opposite to the end 9.
  • the disk 13 lies on the same plane as the lever 7, so that the tooth 11 of said lever may engage into one of the two slots 13A or 13B of said disk, and disengage therefrom.
  • the dobby is completed by a C-shaped control lever 14, an end of which comprises a projecting profile 14A formed in one piece therewith, while its other end has a movable projecting profile formed with a tooth 14B, oscillating between abutting walls 14X and 14Y and kept in position against the first one of said walls by a spring 14D.
  • the control lever 14 oscillates about a fulcrum 14C between a first position, determined by the drawing action of a spring 15 and by an abutment 16, and a second position, determined by the thrust imparted by a programming actuator 17, the action of which is diagrammatically illustrated by two arrows A and B, for the condition of forward movement and, respectively, of reverse movement.
  • the dobby works as follows: as the shaft 1 starts its half turn (fig. 1A) - and in the case of forward movement and of having set the programming so as to change the position of the frame - the programming actuator 17 imparts no thrust on the control lever 14 which, under the action of the spring 15, oscillates against the abutment 16, thereby leaving the rocking selection lever 7 under the returning action of the spring 12, with its tooth 11 engaged into the slot 13A.
  • the programming actuator 17 presets the control for the next half turn, in the sense - in the example shown - of keeping the frame in the previous position. Said actuator 17 thus imparts no thrust on the lever 14, and when the tooth 14B contacts (fig. 2A) the rear surface 8A of the end 8 of the lever 7, shaped with a rising front, it causes said lever 7 - while the rotation of the disk 13 continues - to rotate about its pivot 6, thereby causing the tooth 11, at its opposite end, to gradually disengage from the slot 13A of the disk 13.
  • the eccentric ring 5 thus remains idle in respect of the disk 13, whereby, during the next half turn (fig. 2B), the heald frame controlled by the rod 3 is kept in the previous position.
  • Figs. 3A and 3B show in detail how the lever 14 controls the selection lever 7 during the aforedescribed working steps of the device according to the invention, in the condition of forward movement of the dobby; said steps are illustrated on the diagram of fig. 5A, starting from point 1 - when the lever 7 starts to disengage from the disk 13, due to contact of the tooth 14B with its rear end surface 8A (fig. 3A) - up to point 2 - when the lever 7 is fully released through disengagement of its tooth end 11 from the slot 13A of the disk 13 (fig. 3B).
  • Figs. 4A to 4C show instead, also in detail, how the lever 14 controls the selection lever 7, during the corresponding working steps of the device according to the invention, in the condition of reverse movement of the dobby; said steps are illustrated on the diagram of fig. 5B, starting from point 3 up to point 4.
  • this diagram - by comparing it with the diagram of fig. 5A, and with the diagram of fig. 5C which illustrates the movement of the dobby shaft 1 - in the condition of reverse movement, the positive contact of the control lever tooth 14B with the selection lever 7 takes place, according to the invention, in a way such as to determine a shifting sf in respect of the condition of forward movement.
  • the tooth 14B causes the selection lever 7 to start its oscillation - with the desired shifting, which prevents any jams on changing of the condition from forward movement to reverse movement - until the tooth 11 of said lever totally disengages from the slot 13A of the disk 13 (fig. 4C, and point 4 of the diagram of fig. 5B).
  • the present invention allows, as seen, to select the position of the heald frames without requiring to stop the rotation of the dobby shaft 1 at each half turn, and thus preventing any possible jams during that step; furthermore, it allows an independent selection of the frames, both in the condition of forward movement and in the condition of reverse movement, thereby considerably increasing the dobby speed, with obvious advantages for the productivity of the weaving machine to which said dobby is associated.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (2)

  1. Ratière rotative avec dispositif pour la programmer, pour actionner les cadres à lisses dans des machines à tisser - lesdites ratières étant du type dans lequel les tiges (3) pour commander les cadres à lisses sont actionnées par des bielles (2), chacune montée sur un anneau excentrique (5) tournant relativement à l'arbre principal (1) de ratière, la ratière comprenant également un disque (13) entraíné en rotation par ledit arbre (1) et un levier de sélection (7) pivotant sur ledit anneau excentrique (5) et adapté à engager ledit disque (13) avec son extrémité à dent (11), sous l'action d'un ressort (12) et ledit dispositif comprenant un levier de commande (14) tournant autour d'un point d'appui fixe (14C) sous l'action d'un moyen de poussée (17) et à l'encontre d'un moyen de ressort de rappel (15) de manière que des profils d'extrémité en projection (14A, 14B) dudit levier de commande (14) puissent adopter une position le long de, ou, autrement, au-delà de la trajectoire de l'extrémité (8) dudit levier de sélection (7) à l'opposé de son extrémité à dent (11), afin de provoquer, ou, autrement, empêcher l'engagement dudit levier (7) avec le disque (13) en rotation, la rotation du levier de commande (14) ayant lieu durant la rotation de l'arbre principal (1) de ratière - caractérisée en ce que l'un des profils d'extrémité en projection dudit levier de commande (14) est doté d'une dent (14B), pivotant à l'extrémité correspondante dudit levier dans une fente comportant deux parois de butée divergentes (14X, 14Y), et maintenue en contact avec l'une desdites parois (14X) par un ressort (14D) de manière à pouvoir osciller jusqu'à contacter l'autre paroi (14Y), afin de décaler l'engagement positif avec ledit levier de sélection (7) dans la condition de mouvement arrière de la ratière.
  2. Ratière rotative avec dispositif pour la programmer, pour actionner les cadres à lisses dans des machines à tisser selon la revendication 1, dans laquelle le ressort (12) agissant sur le levier de sélection (7) et le ressort (14D) agissant sur le profil de dent (14B) du levier de commande (14) sont dimensionnés de manière que l'action du premier ressort (12) ne puisse pas être surmontée par l'action du second ressort (14D).
EP96115972A 1995-10-06 1996-10-04 Dispositif pour programmer les ratières rotatives dans les métiers à tisser Expired - Lifetime EP0768402B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI952037 1995-10-06
IT95MI002037A IT1276827B1 (it) 1995-10-06 1995-10-06 Dispositivo per attuare la programmazione di ratiere rotative in macchine di tessitura

Publications (2)

Publication Number Publication Date
EP0768402A1 EP0768402A1 (fr) 1997-04-16
EP0768402B1 true EP0768402B1 (fr) 2000-04-12

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ID=11372317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115972A Expired - Lifetime EP0768402B1 (fr) 1995-10-06 1996-10-04 Dispositif pour programmer les ratières rotatives dans les métiers à tisser

Country Status (3)

Country Link
EP (1) EP0768402B1 (fr)
DE (1) DE69607716T2 (fr)
IT (1) IT1276827B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1729326B (zh) * 2002-12-19 2010-09-22 F.I.R.S.T.股份公司 织机中用于执行回转式多臂机设定程序的装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0882821B1 (fr) * 1997-06-03 2003-11-05 FIMTEXTILE S.p.A. Dispositif pour programmer les ratières rotatives dans les machines à tisser
ITMI20010670A1 (it) * 2001-03-29 2002-09-29 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative per macchine di tessitura comportante mezzi di comando a motore elettrico line
ITMI20022151A1 (it) * 2002-10-10 2004-04-11 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative per macchine di tessitura comportante mezzi di comando a motore elettrico rotativo perfezionati
ITMI20022152A1 (it) * 2002-10-10 2004-04-11 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative per macchine di tessitura comportante mezzi di comando a motore elettrico lineare perfezionati
FR2899244B1 (fr) * 2006-03-31 2008-06-13 Staubli Faverges Sca Ratiere rotative, metier a tisser equipe d'une telle ratiere et element d'entrainement pour une telle ratiere

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2540524B1 (fr) * 1983-02-07 1985-07-26 Staubli Sa Ets Ratiere rotative synchronisee pour metiers a tisser
FR2596425B1 (fr) * 1986-03-26 1988-05-20 Staubli Sa Ets Ratiere rotative pour machines a tisser
IT1243890B (it) * 1990-11-05 1994-06-28 Giobbe Srl Dispositivo per il comando e controllo di una ratiera rotativa di macchine tessili con leva profilata a camma e relativi mezzi di contrasto cooperanti

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1729326B (zh) * 2002-12-19 2010-09-22 F.I.R.S.T.股份公司 织机中用于执行回转式多臂机设定程序的装置

Also Published As

Publication number Publication date
ITMI952037A1 (it) 1997-04-06
ITMI952037A0 (fr) 1995-10-06
EP0768402A1 (fr) 1997-04-16
DE69607716T2 (de) 2000-09-21
DE69607716D1 (de) 2000-05-18
IT1276827B1 (it) 1997-11-03

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