EP0882821B1 - Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen - Google Patents

Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen Download PDF

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Publication number
EP0882821B1
EP0882821B1 EP19980110019 EP98110019A EP0882821B1 EP 0882821 B1 EP0882821 B1 EP 0882821B1 EP 19980110019 EP19980110019 EP 19980110019 EP 98110019 A EP98110019 A EP 98110019A EP 0882821 B1 EP0882821 B1 EP 0882821B1
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EP
European Patent Office
Prior art keywords
lever
engaging lever
engaging
spring
rocker
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
EP19980110019
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English (en)
French (fr)
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EP0882821A1 (de
Inventor
Gian Luigi Cremonesi
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FIMTEXTILE SpA
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FIMTEXTILE SpA
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Publication date
Priority claimed from ITMI971304 external-priority patent/IT1292068B1/it
Priority claimed from ITMI971303 external-priority patent/IT1292067B1/it
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Publication of EP0882821A1 publication Critical patent/EP0882821A1/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 relates to a selector device for performing the programming of rotary dobbies for actuating the heald frames in weaving looms.
  • the heald frames must correspondingly assume a high position and a low position, drawing with them during this movement the corresponding warp yarns.
  • a weave machine and, in particular, "dobbies" are used, in which suitable eccentrics control the movement of the respective frames by means of lever mechanisms.
  • the upward and downward movement of the heald frames must be able to be programmed so that, at each half turn of the main shaft, the individual frame may be kept in a high position, in a low position or displaced from one position to another.
  • the corresponding eccentric must be idle with respect thereto, to keep the associated frame immobile, and alternately must be joined to the main shaft, to move the frame itself: the selection device apt to perform this programming operation forms precisely the subject of the present invention.
  • FIG. 1 of the accompanying drawings in which, by way of example, the evolution of a reference angle on the main shaft of the loom as a function of the time and the corresponding displacement of a theoretical selector (a) and of a selector of the known art (b and c) is shown.
  • the theoretical selector reaches its maximum displacement, which corresponds to the operation of disengaging the engaging member which joins together the eccentric and the main shaft, at a singular point of the curve (apex of the curve (a)): this would be possible only if the contact between the selector and the engaging member were able to occur in a punctual and instantaneous manner. It is obvious that this condition cannot be realized in practice, both because the engaging member requires a discrete time in order to engage and disengage the eccentric and the main shaft from one another and because operation would be too critical depending on the play and the constructional tolerances.
  • the control member which joins the eccentric to the main shaft, consists of an engaging lever, fixed to the eccentric, having an engaging tooth which is alternately engaged with or disengaged from a recess formed in a member fixed to the main rotational shaft, so as to engage and disengage, respectively, the eccentric with/from the main shaft.
  • the engaging lever is formed in the manner of a profile in the form of a cam with which the end of C-shaped controlling lever interacts. In this way, the end of the controlling lever may be brought into the trajectory of the engaging lever in advance of the arrival of the lever itself, since the cam profile ensures that the pressing action thereon, and the consequent disengagement of the engaging tooth, is performed gently.
  • Locking of the engaging lever both in the position where the engaging tooth is extracted from its recess (frame idle) and in the position where the tooth is engaged (frame which varies its position), is moreover ensured by means of a small stud which is fixed to a connecting rod and which engages in a corresponding recess on an end of the lever itself.
  • a solution proposed in the known art consists in providing a resilient mounting assembly for the pin on the connecting rod.
  • a second category of drawbacks arises from the need to perform an equivalent selection both during forwards running and during reverse running of the loom.
  • the cam profile of the engaging lever is designed to perform a correct engagement and disengagement motion of the engaging tooth during forwards running of the weaving loom, while it is difficult to obtain the same thing for reverse running of the loom itself.
  • the interaction will take place correctly in one direction (for example during forwards running of the loom) and in advance in the opposite direction (for example during reverse running of the loom), thus resulting in an operational phase-shift.
  • a double actuator or a double operating phase actuator is used, so as to cause the end of the C-shaped controlling lever to interfere with the trajectory of the engaging lever at different times for forwards running and for reverse running.
  • actuation of the controlling lever must occur with a phase delay sf so as to follow the line 5, 6, 7, 8 of the graph (c) of Fig. 1, where the active operation occurs at 6, i.e. in phase with the active operation 2 of forwards running.
  • the double actuator is a delicate component which is difficult to program and costly.
  • the double actuator remains indispensable in the solution proposed in the Italian Patent Application No. MI95A002037, in which a further improvement has been obtained by providing one end of the controlling lever with an oscillating profile.
  • This solution solves, however, only partially the abovementioned problems of phase-displacement between forwards running and reverse running.
  • the device according to the invention forms part of a dobby which comprises a rotating shaft 1 onto which there is mounted a connecting-rod element 2 shaped so as to have a projection 2a pivotably mounted at 3a on the operating rod 3 of the corresponding heald frame (not shown) and a substantially circular ring 2b on which two pins 2c are mounted in opposite positions.
  • a bearing 4 is provided in a central position on the connecting rod 2, on the inner race of the bearing being mounted an eccentric cam 5 being able to rotate, as can be seen further below, with respect to the shaft 1.
  • a rocker arm lever 7, or engaging lever On the eccentric cam 5 there is pivotably mounted, by means of a rivet 6 or the like, a rocker arm lever 7, or engaging lever, which has shaped ends 8 and 9, a seat 20 and an engaging tooth 11 on the inner side opposite to the end 9.
  • a spring 12 arranged between the eccentric cam 5 and the end 9 of the lever 7 exerts a recall action on the lever 7 itself and thus tends to cause it rotate so as to move the tooth 11 towards the axis of rotation of the shaft 1.
  • a disk 13 is keyed coaxially on said shaft 1, on the periphery of said disk there being formed two recesses 13a and 13b which are arranged diametrically opposite one another with respect to the centre of rotation of the disk 13 itself.
  • the disk 13 has the same lie as the lever 7 so that the tooth 11 of the latter is able to engage with one of the two recesses 13a or 13b and disengage therefrom.
  • the dobby is completed by an controlling lever 14, which is C-shaped and the ends of which, according to the invention, are equipped with respective movable projecting profiles in the form of teeth 14a and 14b which oscillate between abutting walls 14x and 14y and are kept in position against the former of said walls by springs 14d.
  • the controlling lever 14 oscillates about a pivot 14c between a first position, defined by the biasing force of a spring 15 and by an abutment element 16, and a second position defined, according to the invention, by the thrust exerted by a sole programming actuator 17 or single operating phase actuator, the action of which is schematically indicated by means of an arrow A.
  • the dobby operates as follows: at the start of the half-turn of the shaft 1 (Fig. 2) and in the case of forwards running and programming effected with a view to varying the position of the frame, the actuator 17 does not exert any action on the lever 14, which, being subject to the action of the spring 15, abuts against the element 16, thus leaving the rocker-arm engaging lever 7 subject to the recall action of the spring 12, with the tooth 11 engaged in the recess 13a.
  • the eccentric 5 is integrally joined to the rotating disk 13 which, rotating together with the shaft 1 during the half-turn (Fig. 3), draws with itself in rotation the eccentric 5 and hence the connecting rod 2 which, rotating, also draws the operating lever 3 of the frame, causing it to change position.
  • the programming device 17 pre-sets the control action relating to the next half-turn, namely in the example in question in view of keeping the frame in the previous position. It does not exert, therefore, any action on the controlling lever 14, and the tooth 14b, when it comes into contact (Fig. 2A) with the rear surface 8a of the end 8 of the engaging lever 7, formed with a rising front face, forces the lever 7 itself, continuing the rotation of the disk 13, to rotate about its rivet 6, causing the tooth 11, which is provided at the opposite end, to gradually come out of the recess 13a of the disk 13.
  • the eccentric cam 5 thus remains idle with respect to the disk 13, thus resulting in the previous position of the heald frame controlled by the lever 3 being maintained during the next half-turn (Fig. 3B).
  • Figs. 2B and 3B illustrate in detail how the engaging lever 7 is controlled during the stages of operation of the device according to the invention described above, in the forwards running condition.
  • Figs. 4, 5 and 6 show, on the other hand, in the same detail, how the engaging lever 7 is controlled during the corresponding stages of operation of the device in the reverse running condition.
  • the step of engagement of the tooth 14b of the controlling lever 14 with the engaging lever 7 takes place, in accordance with the invention, in such a way as to provide a phase-displacement sf (Fig. 1) in the rotation of the shaft 1 with respect to the phase in the forwards running condition, equivalent to the idle stroke which the engaging lever 7 performs before bringing the tooth 14b into abutment against the wall 14y.
  • phase-displacement sf makes it possible to compensate for the fact that the interaction between the lever 7 and the tooth 14b is not "punctual" and would therefore occur at two different points for forwards and reverse running, resulting in the loss of selection equivalence between these two motion conditions.
  • the opposite end 14a of the controlling lever 14 operates in a manner similar to that just described, the two ends being apt to select the idle condition of the heald frames respectively at the top dead centre and bottom dead centre of the operating rod 3 which acts on the frame itself.
  • the programming actuator 17 is always able to intervene in the same manner, both in order to position the end 14a and to position the end 14b, no longer having to ensure a separate synchronised selection for forwards running and for reverse running of the loom.
  • the solution illustrated hitherto is totally innovative and fully solves the problems of the known art. In particular, it ensures a very gentle selection action, drastically reduces the deceleration dead time for performing selection itself and eliminates the need for the double operating phase actuator.
  • a rocker arm lever 7, or engaging lever is mounted pivotably on the eccentric 5 by way of a rivet 6, or the like, and has a shaped rear end 8 and front end 9 from the opposite side of which an engaging tooth 11 projects.
  • a spring 12 arranged between the eccentric 5 and the end 9 of the lever 7 exerts a recall action on the lever 7 itself and thus tends to cause it to rotate so as to move the tooth 11 towards the axis of rotation of the shaft 1.
  • a disk 13 is mounted onto said shaft 1, coaxially therewith, and has formed on its periphery two recesses 13a and 13b which are arranged diametrically opposite with respect to the centre of rotation of the disk 13 itself.
  • the disk 13 has the same lie as the lever 7 such that the tooth 11 of the latter is able to engage with one of the two recesses 13a or 13b or disengage therefrom.
  • the dobby is completed by an controlling lever 14 which is C-shaped and the ends of which are formed with suitable profiles 24a and 24b.
  • the controlling lever 14 oscillates about a pivot 14c between a first position, defined by the pulling force of a spring 15 and by an abutment element 16, and a second position defined by the thrust exerted by a programming actuator, the action of which is schematically indicated by means of an arrow 27.
  • the engaging lever 7 (Figs. 9 and 10) has its own seat 30, engaging the locking pin 2c, formed on a rocker 28 mounted pivotably on the lever 7 by means of a pin 28a.
  • the rocker 28 is kept in a rest position by a locating element 29 and by a spring 29a.
  • the pivot pin 28a of the rocker coincides with the rivet 6 of the lever 7.
  • the locating element 29, which is integral with the rocker 28 urges, as a result of the action of the spring 29a, against a tooth 7a formed on the front end 9 of the engaging lever 7.
  • the pivot pin 28a is arranged instead on the end 9 of the lever 7.
  • the locating element 29 abuts, again as a result of the action of the spring 29a, against the outer edge of the lever 7.
  • the inherent resilient oscillating movement of the rocker 28 ensures that the pin 2c is securely inserted into the seat 30 even in the event of an imprecise approach movement of the two elements, owing to the rocker 28, on which the seat 30 is formed, being apt to adapt itself locally around the pin 2c.
  • the dobby - in the case of the embodiment according to Figs. 7 to 10 - operates as follows: at the start of the half-turn of the shaft 1 (Fig. 8) and in the case of forwards running and programming effected with a view to varying the position of the frame, the programming device 17 does not exert any action on the lever 14 which, as a result of the action of the spring 15, comes into abutment against the element 16 and, not causing interference of the end 24b with the lever 7, leaves the latter subject to the recall action of the spring 12 which keeps the tooth 11 engaged in the recess 13a.
  • the eccentric 5 is integrally joined to the rotating disk 13 which, rotating with the shaft 1 during the half-turn (Fig. 8), draws in rotation the eccentric 5 itself and hence the connecting rod 2 which, oscillating, draws the operating rod 3 of the frame, causing it to change position.
  • the programming device 17 pre-sets the controlling action relating the next half-turn, namely in the example in question keeping the frame in the previous position. It does not exert, therefore, any action on the lever 14, and the end 24a thereof, when it comes into contact (Fig. 7A) with the surface of the rear end 8 of the engaging lever 7, formed with a rising front face, forces the lever 7 itself, continuing the rotation of the disk 13, to rotate about its rivet 6, causing the tooth 11 to come out gradually from the recess 13a of the disk 13.
  • the rocker 28 moves towards the pin 2c, until the latter is received in the seat 30.
  • the possibility of resilient adaptation of the rocker 28 against the pin 2c ensures that r.o faulty catching of the two elements occurs (something which could give rise to an irregular escaping movement of the tooth 11 from the recess 13a and to the drawbacks mentioned above) and therefore produces perfect engagement of the lever 7 with the pin 2c.
  • the eccentric 5 thus remains idle with respect to the disk 13 and integrally joined, by means of the lever 7 and the pin 2c, to the connecting rod 2, this resulting in the previous position of the heald frame controlled by the rod 3 being maintained during the next half-turn (Fig. 8A).
  • FIGs. 11 and 12 A further embodiment of the invention is illustrated in Figs. 11 and 12.
  • the two ends 34a and 34b of the controlling lever are still provided with resiliently oscillating teeth 34x and 34y, which operate in a manner similar to that of the resiliently oscillating teeth of the first embodiment of the device (Figs. 2 to 6).
  • the oscillating teeth 34x and 34y allow the cam end 8 of the lever 7 to be operated in an equivalent manner both during forwards running and during reverse running of the loom.
  • the present invention ensures selection and blocking of the position of the heald frames, avoiding any possible faulty catching during this stage both during forwards running and during reverse running of the loom.

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

Claims (6)

  1. Vorrichtung zum Ausführen der Programmierung von Dreh-Dobbys für den Betrieb der Schäfte in Webmaschinen, von der Art, bei denen die Betätigungshebel (3) der Schäfte durch Verbindungsstangen (2) betätigt werden, die jeweils an einem exzentrischen Ring (5) montiert sind, der sich bezüglich der Hauptwelle des Dobbys dreht, wobei der Ring (5) weiter eine sich mit der Welle (1) drehende Scheibe (13) und einen schwenkbar auf dem exzentrischen Ring (5) montierten Eingriffshebel (7) aufweist, der mittels seines Endzahns (11) infolge der Wirkung einer Feder in eine Scheibe (13) eingreifen kann, wobei die Vorrichtung einen Steuerhebel (14) aufweist, der sich unter der Wirkung eines Druckmittels (17) und gegen federartige Rückstellmittel (15) um einen ortsfesten Zapfen (14c) dreht, so dass vorragende Endprofile (14a, 14b) des Steuerhebels, die alternierend entlang oder außerhalb der Bahn des Endes (8) gegenüberliegend zu dem gezahnten Ende des Eingriffshebels (7) angeordnet sind, dessen Eingriff in die Drehscheibe (13) verursachen oder verhindern, wobei das Verschwenken des Steuerhebels (14) während der Drehung der Hauptwelle ausgeführt wird, und wobei der Eingriffshebel (7) weiter einen Sitz (20, 30) zum Eingriff mit Stiften (2c) der Verbindungsstange (29) hat, dadurch gekennzeichnet, dass die beiden vorragenden Endprofile des Steuerhebels (14) mit einem Zahn (14a, 14b; 34a, 34b) versehen sind, der schwenkbar an dem entsprechenden Ende des Hebels (14) in einer Ausnehmung mit zwei divergierenden Anlageflächen (14x, 14y) montiert ist und mittels einer Feder (14d) mit einer der Anlageflächen (14x) in Berührung gehalten wird, so dass er verschwenken kann, bis er mit der äußeren Wand (14y) in Berührung kommt, um den aktiven Eingriff mit dem Eingriffshebel (7) bei dem Rückwärtslauf des Dobbys bezüglich der Phase zu verlagern und dass das Druckmittel (17) aus einem einzig arbeitenden Phasenprogrammieraktuator besteht.
  2. Vorrichtung nach Anspruch 1, bei der die Feder, die auf den Eingriffshebel wirkt (7) und die Feder, die auf die gezahnten Profile (14a, 14b) des Steuerhebels (14) wirkt, derart dimensioniert sind, dass die Wirkung der erstgenannten nicht von der Wirkung der letztgenannten übertroffen werden kann.
  3. Vorrichtung nach Anspruch 1 oder Anspruch2, bei der der Sitz (30) auf einem sich hin und her bewegenden Rocker (28) schwenkbar auf einem Ende des Eingriffshebels dem Endzahn (11) gegenüberliegend montiert ist und der Wirkung einer Feder (29a) unterworfen ist, wobei der Sitz (30) dazu eingerichtet ist, einen Verrigelungsstift (2c), der mit dem Körper der Verriegelungsstange (2) einstückig ist, zu ergreifen.
  4. Vorrichtung nach Anspruch 3, bei der der Rocker (28) durch die kombinierte Wirkung einer Feder (291), die zwischen dem Rocker (30) und dem Eingriffshebel (7) wirkt, und einem Lokalisierungselement (29), das in Berührung mit dem Racd des Eingriffshebels kommt, in seiner Ruhestellung gehalten wird.
  5. Vorrichtung nach Anspruch 4, bei der der Rocker (28) mittels eines Stifts (28a), der mit der Niet (6) übereinstimmt, schwenkbar auf dem Eingriffshebel (7) zur Drehung des Hebels selbst auf dem Exzenter (5) montiert ist.
  6. Vorrichtung nach Anspruch 4, bei der der Rocker (28) mittels eines Stifts (28a), der auf dem vorderen Ende (9) des Eingriffshebels angeordnet ist, schwenkbar auf dem Eingriffshebel (7) montiert ist.
EP19980110019 1997-06-03 1998-06-02 Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen Expired - Lifetime EP0882821B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITMI971304 IT1292068B1 (it) 1997-06-03 1997-06-03 Dispositivo di programmazione per ratiere rotative in macchine di tessitura
ITMI971303 IT1292067B1 (it) 1997-06-03 1997-06-03 Dispositivo di programmazione per ratiere rotative in macchine di tessitura
ITMI971303 1997-06-03
ITMI971304 1997-06-03

Publications (2)

Publication Number Publication Date
EP0882821A1 EP0882821A1 (de) 1998-12-09
EP0882821B1 true EP0882821B1 (de) 2003-11-05

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EP19980110019 Expired - Lifetime EP0882821B1 (de) 1997-06-03 1998-06-02 Vorrichtung zum Programmieren von Rotationsschaftmaschinen in Webstühlen

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DE (1) DE69819405T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (4)

* 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
IT1276827B1 (it) * 1995-10-06 1997-11-03 Fimtextile Spa Dispositivo per attuare la programmazione di ratiere rotative in macchine di tessitura

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EP0882821A1 (de) 1998-12-09
DE69819405D1 (de) 2003-12-11
DE69819405T2 (de) 2004-09-02

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