EP1251194B1 - Verbesserte Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen - Google Patents

Verbesserte Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen Download PDF

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Publication number
EP1251194B1
EP1251194B1 EP02006721A EP02006721A EP1251194B1 EP 1251194 B1 EP1251194 B1 EP 1251194B1 EP 02006721 A EP02006721 A EP 02006721A EP 02006721 A EP02006721 A EP 02006721A EP 1251194 B1 EP1251194 B1 EP 1251194B1
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EP
European Patent Office
Prior art keywords
lever
rod
cam profile
joint
toggle
Prior art date
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Expired - Lifetime
Application number
EP02006721A
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English (en)
French (fr)
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EP1251194B8 (de
EP1251194A1 (de
Inventor
Gian Luigi Cremonesi
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Promatech SpA
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FIRST SpA
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Publication date
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Publication of EP1251194B1 publication Critical patent/EP1251194B1/de
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Publication of EP1251194B8 publication Critical patent/EP1251194B8/de
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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 to carry out the programming of rotary dobbies for the operation of heald frames in weaving machines. It concerns, more particularly, a programming device comprising improved control means operated by electric linear motors.
  • the positioning of the heald frames of a weaving machine or loom which determines the weft pattern of the finished fabric, must be programmed according to a preset sequence indicating the position which each frame should take up at each rotation of the main shaft sending the controls to the oscillating devices operating the heald frames, so as to set them in one of the two requested positions, high or low.
  • the control device Since the main shaft of the dobby is operated with an intermittent cycle, having a dead point at each rotation of 180°, the control device must, at each stopping of the main shaft, cause the engagement of the rotation shaft with - or, alternatively, its disengagement from - an eccentric, or similar device, operating the leverages controlling the movements of the heald frames; this would, in one case, change the positioning of such frames and, in the other, keep them in their previous position.
  • the dobbies which control the heald frames in weaving looms must therefore be operated by means of special programming devices apt to determine, through suitable actuators, the change of the respective positions of the control means which, in turn, change the position of the heald frames.
  • the technical problem of conceiving a device to carry out the program-ming of dobbies, particularly rotary dobbies for the operation of weaving machines - which device: allows to select the position of the heald frames without stopping the rotation of the main shaft at each half-rotation; allows an independent selection of the frames for the clockwise rotation and for the anticlockwise rotation; and reduces the stress on the warp yarns, keeping reduced stresses and efforts in the dobby members, in order to allow very high working speeds and a low power consumption - had been solved with a device forming the object of EP-B1-0 768 402 , in the name of the same Applicant.
  • Said device - meant for rotary dobbies of the type in which the rods to control the heald frames are operated by connecting rods, each mounted onto an eccentric ring rotating in respect of the main shaft of the dobby, which comprises moreover 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 - comprises 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 alternately position themselves along or outside the trajectory at the end of the selection lever opposite to its toothed end, so as to cause or 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.
  • the invention thus concerns a device to carry out the programming of rotary dobbies for the operation of heald frames in weaving machines, particularly looms - of the type in which the control rods for the heald frames are operated by connecting rods, each mounted on an eccentric ring rotating in respect of the main shaft of the dobby, which comprises moreover a disk caused to rotate by said shaft and a selection lever pivoted on said eccentric ring and apt to engage said disk with one of its end teeth, under the action of a spring, said device comprising a toggle-joint lever controlled so as to oscillate about a fixed fulcrum, so that projecting end profiles of said lever may alternately position themselves along or outside the trajectory at the end of the selection lever opposite to the toothed end, so as to cause or prevent the engagement of said lever with the rotating disk - wherein the controls to cause the oscillation of the toggle-joint lever are obtained, in coordination with the rotation of the main shaft of the loom and against the action of a spring, by means of an electric linear stepping motor in
  • said cam profile engages said other end of the rod only from the outside.
  • said cam profile and said other end of the rod are shaped so as to obtain a mutual bilateral engagement between them.
  • said engagement is obtained by giving to the other end of the rod a substantially cylindrical configuration, and by forming said cam profile as a body with two cylindrical cavities opening towards the rod and being mutually radiused outwardly thereof.
  • the cam profile is replaced by a lever oscillating with one end about a fixed point and having the other end pivoted in the joint between the link and the rod.
  • Fig. 1 is a diagrammatic part section view of a rotary dobby to which is applied a first embodiment of the device according to the invention
  • Fig. 2 is a section view, similar to that of fig. 1 , to which is applied a second embodiment of the device according to the invention.
  • Fig. 3 illustrates, very diagrammatically, a third possible embodiment of the device according to the invention.
  • the device according to the present invention forms part of a dobby which comprises a main shaft 1 onto which is keyed a connecting rod 2, shaped so as to have a projection 2A pivoted in 3A to the control rod 3 for the heald frames (not shown) and a substantially circular ring 2B carrying two pins 2C in opposite positions.
  • a bearing 4 is inserted at the centre of the connecting rod 2, an eccentric ring 5 being mounted onto the inner ring of said bearing 4 and being apt to rotate in respect of the shaft 1, as seen hereinafter.
  • a rocking or selection lever 7 On the eccentric ring 5 there is mounted oscillating, by means of a rivet 6 or like, a rocking or selection lever 7 having shaped ends 8 and 9 and, on its inner side, a tooth 11 opposite to the end 9.
  • a disk 13 On said shaft 1 is finally keyed a disk 13, on the periphery of which there are formed two notches 13A and 13B, diametrally opposite in respect of the rotation centre of said disk 13 positioned on the axis of the shaft 1.
  • the disk 13 lies on the same plane as the lever 7, so that the tooth 11 of this latter is apt to engage one of its two notches 13A or 13B, and disengage therefrom.
  • the device is completed by a toggle-joint control lever 14, the ends of which have projecting profiles, shaped in the form of pawls 14A, 14B, mounted so as to oscillate against the action of springs 14C, 14D.
  • the control lever 14 is apt to oscillate - being mounted with an intermediate point thereof rotatable about a fulcrum 14E - so as to take up different positions, strictly coordinate with the rotation of the main shaft of the loom on which the dobby is mounted; in such positions, the shaped end profiles 14A and 14B of the lever 14 are apt to engage, or not engage, the end 8 of the selection lever 7 opposite to its toothed end 11.
  • the positions of the lever 14 are controlled, against the action of a return spring 15, by an electric linear stepping motor 16, in which the rectilinear driving member 16A operates, by means of a link 17, on a rod 18 having one end 19 pivoted close to an end of the toggle-joint lever, and the other end 20 guided by a cam profile.
  • the cam profile 21 which guides the end 20 of the rod 18, engages said end 20 only from the outside, stops 18A and 18B being apt to limit the lateral movements of said rod 18.
  • the end 20 of the rod 18 has a substantially cylindrical configuration and said cam profile is formed as a body 22 comprising two radiused cylindrical cavities 23 and 24.
  • the cam profile is replaced by a lever 25, oscillating with one end 26 about a fixed point 27 and having the other end 28 pivoted in the joint 29 between the link 17 and the rod 18.
  • the controls to cause the oscillations of the toggle-joint lever 14 about the fixed fulcrum 14E are obtained thanks to the precise rectilinear movements of the driving member 16A of the electric linear stepping motor 16, through the link 17 and the rod 18; this allows the projecting end profiles 14A and 14B of said lever to alternately position themselves - promptly and with great precision - along or outside the trajectory at the end 8 of the selection lever 7 opposite to the toothed end 11, so as to cause or prevent the engagement of said lever with the rotating disk 13, and thereby achieve an optimal working of the dobby in the various operating conditions.
  • the solution according to the present invention allows moreover to limit the effort which the motor 16 has to make in order to cause the oscillation of the toggle-joint lever 14 against the action of the spring 15; said effort is in fact considerably reduced as compared to the solutions of prior art, thanks to the interposition of the leverages - highly advantageous from the mechanical point of view - which characterize the present invention.
  • the power required from the motor 16 is thus limited in a mechanical way and this allows to use, in the device according to the invention, electric linear stepping motors 16 of small dimensions and, in particular, of highly reduced thickness (even not exceeding 24 mm).
  • This last characteristic of the motors 16 being used is extremely important in the construction and working of the device according to the invention, wherein - as known - the toggle-joint levers controlling the motion of the connecting rods operating the control rods for the heald frames must be positioned strictly close, just like said frames in the loom. It is hence very important also for the motors operating the toggle-joint levers to be very close (if possible, no less than said levers), so as to avoid the structural complications of the device which would otherwise turn out to be indispensable.
  • the invention fully reaches this object and thus achieves a considerable and unexpected technical progress, allowing to produce far more compact, simple and less costly devices than those produced up to now.
  • Such devices have moreover the advantage to guarantee, far more than the known devices, that the toggle-joint levers remain in their working positions, thanks to the cooperation - according to the invention - between the end 20 of the rod 18 of the leverage and the cam profiles 21, 22, or the lever 25.
  • the embodiment of fig. 2 is particularly efficient in this respect, since its cam profile 22 is formed as a body with two cylindrical cavities 23 and 24, opening towards the rod 18 and being mutually radiused outwardly thereof: said cam profile 22 is thus apt to determine, with the end 20 of the rod 18, a mutual bilateral engagement in both working positions.

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

Claims (5)

  1. Vorrichtung zum Ausführen der Programmierung von rotierenden Schaftmaschinen zur Betätigung von Schaftrahmen in Webmaschinen, insbesondere Webstühlen, bei denen die Steuerstangen (3) für die Schaftrahmen durch Verbindungsstangen (2) betätigt werden, von denen jede an einem exzentrischen Ring (5) angebracht ist, der relativ zur Hauptachse (1) der Schaftmaschine rotiert, wobei die Schaftmaschine darüber hinaus eine Scheibe (13) aufweist, die durch die Hauptachse (1) zum Rotieren gebracht wird, und einen drehbar an dem exzentrischen Ring (5) angebrachten Wählhebel (7), geeignet, die Scheibe (13) mittels einer Feder (12) mit einem seiner Endzähne (11) zu erfassen, mit einem Kniegelenkhebel (14), der derart geführt ist, dass er um eine feststehende Drehachse (14E) schwingt, so dass sich hervorstehende Endprofile (14A, 14B) des Kniegelenkhebels (14) abwechselnd entlang oder außerhalb der Bewegungsbahn am Ende (8) des Stellhebels (7), seinem verzahnten Ende (11) abgewandt, positionieren, so dass sie den Eingriff des Kniegelenkhebels (14) mit der rotierenden Scheibe (13) hervorrufen oder verhindern, wobei die Steuerung zum Hervorrufen der Schwingung des Kniegelenkhebels (14) in Koordination mit der Rotation der Hauptachse (1) des Webstuhls und gegen die Kraft der Feder (15) durch ein elektrisches Antriebsmittel erhalten wird, dadurch gekennzeichnet, dass das elektrische Antriebsmittel einen elektrischen linearen Schrittmotor (16) umfasst, in dem das geradlinige Antriebselement (16A) über eine Kupplung (17) auf eine Stange (18) wirkt, wobei das eine Ende (19) der Stange (18) drehbar in der Nähe eines Endes des Kniegelenkhebels (14) gelagert ist und das andere Ende (20) durch ein Nockenprofil (21, 22) geführt ist.
  2. Vorrichtung nach Anspruch 1, wobei das Nockenprofil (21) mit dem anderen Ende (20) der Stange (18) nur von Außen im Eingriff ist.
  3. Vorrichtung nach Anspruch 1, wobei das Nockenprofil (22) und das andere Ende (20) der Stange (18) derart geformt sind, dass sie sich in den beiden Arbeitspositionen im gegenseitigen Eingriff befinden.
  4. Vorrichtung nach Anspruch 3, wobei das andere Ende (20) der Stange (18) im Wesentlichen zylindrisch aufgebaut ist und das Nockenprofil (22) als Körper mit zwei zylindrischen Kavitäten (23, 24) ausgebildet ist, die in Richtung der Stange (18) geöffnet sind und außerhalb davon wechselweise mit Radien versehen sind.
  5. Vorrichtung nach Anspruch 1, wobei das Nockenprofil durch einen Hebel (25) ersetzt ist, der mit einem Ende (26) um einen festen Punkt (27) schwingt und mit einem anderen Ende (28) drehbar an der Verbindungsstelle (29) zwischen der Kupplung (17) und der Kurbelstange (18) gelagert ist.
EP02006721A 2001-03-29 2002-03-22 Verbesserte Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen Expired - Lifetime EP1251194B8 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001MI000670A ITMI20010670A1 (it) 2001-03-29 2001-03-29 Dispositivo per attuare la programmazione di ratiere rotative per macchine di tessitura comportante mezzi di comando a motore elettrico line
ITMI010670 2001-03-29

Publications (3)

Publication Number Publication Date
EP1251194A1 EP1251194A1 (de) 2002-10-23
EP1251194B1 true EP1251194B1 (de) 2009-12-30
EP1251194B8 EP1251194B8 (de) 2010-02-17

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EP02006721A Expired - Lifetime EP1251194B8 (de) 2001-03-29 2002-03-22 Verbesserte Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen

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EP (1) EP1251194B8 (de)
DE (1) DE60234890D1 (de)
IT (1) ITMI20010670A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
ITMI20022695A1 (it) * 2002-12-19 2004-06-20 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative in macchine di tessitura

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
IT1251107B (it) * 1991-07-25 1995-05-04 Costantino Vinciguerra Perfezionamenti in una ratiera rotativa ad altissima velocita'
IT1276827B1 (it) * 1995-10-06 1997-11-03 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative in macchine di tessitura
EP0883704A1 (de) * 1996-02-28 1998-12-16 Ernst Kleiner Kupplungsvorrichtung für textilmaschinen und schaftmaschine mit kupplungsvorrichtung
IT1283717B1 (it) * 1996-04-04 1998-04-30 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative in macchine di tessitura.
JP2000096379A (ja) * 1998-09-18 2000-04-04 Murata Mach Ltd ロータリードビー

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Publication number Publication date
DE60234890D1 (de) 2010-02-11
EP1251194B8 (de) 2010-02-17
ITMI20010670A1 (it) 2002-09-29
ITMI20010670A0 (it) 2001-03-29
EP1251194A1 (de) 2002-10-23

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