EP1245707B1 - Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser - Google Patents

Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser Download PDF

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Publication number
EP1245707B1
EP1245707B1 EP01830224A EP01830224A EP1245707B1 EP 1245707 B1 EP1245707 B1 EP 1245707B1 EP 01830224 A EP01830224 A EP 01830224A EP 01830224 A EP01830224 A EP 01830224A EP 1245707 B1 EP1245707 B1 EP 1245707B1
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EP
European Patent Office
Prior art keywords
teeth
gearwheel
front clutch
loom
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
EP01830224A
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German (de)
English (en)
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EP1245707A1 (fr
Inventor
Angelo Gallizioli
Corrado Volpi
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
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Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Priority to AT01830224T priority Critical patent/ATE415509T1/de
Priority to EP01830224A priority patent/EP1245707B1/fr
Priority to DE60136686T priority patent/DE60136686D1/de
Publication of EP1245707A1 publication Critical patent/EP1245707A1/fr
Application granted granted Critical
Publication of EP1245707B1 publication Critical patent/EP1245707B1/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
    • D03D51/02—General arrangements of driving mechanism

Definitions

  • the present invention relates to a novel multi-position front clutch having a locking device of the movable element, which can be used in a drive unit of a weaving loom.
  • the improved front clutch according to the present invention although it may also be used in more conventional drive units, is particularly advantageous when applied to a drive unit according to the abovementioned EP 1 158 081 .
  • Fig. 1 schematically shows a preferred embodiment of the abovementioned drive unit, in which the improved front clutch according to the present invention is incorporated.
  • the drive unit illustrated in fig. 1 comprises a single motor 20, on the output shaft 19 of which a first pinion 22a is keyed; a second pinion 22b is also keyed onto an intermediate shaft 34, coaxial and aligned with the shaft 19.
  • the shaft 34 is connected to the shaft 19, so as to be driven therefrom, by means of an electromechanical front clutch 28, which is preferably of the multi-position type and remotely operated by a drive unit 30 which is in turn controlled by a control unit 31.
  • the main shaft 21 moves solely the weaving devices of the loom, schematically indicated by the block 27, namely the sley with associated reed and, in the case of a gripper-type looms, the mechanisms to control the grippers in addition to any auxiliary weaving devices, for example for the selvedge formation.
  • the pinion 22a is meshed with a gearwheel 24, said gearwheel 24 being keyed coaxially with a driven shaft 25 of the loom.
  • the driven shaft 25 is in turn connected to a weave machine schematically indicated by the block 26 and to any other accessory devices thereof.
  • the driven shaft 25 and therefore the weave machine 26, are always connected to the movement of the motor 20, while the main shaft 21 and therefore the weaving devices 27, may be separated therefrom, as required, by disengagement of the clutch 28.
  • the front clutch 28 is in the engaged position and the motor 20 drives both the weaving devices 27 and the weave machine 26 at the desired speed, and therefore also optionally in the slow running condition, by means of suitable adjustment of its speed value to the constant desired speed.
  • the torque direction By reversing the torque direction, on the other hand, it is possible to obtain a braking effect with the required gradual action and rapidity.
  • the front clutch 28 may be disengaged and therefore, upon starting the motor again, it is possible to obtain the desired forward and backward operating movements of the weave machine alone, in order to carry out the search of the shed in which a faulty weft has been inserted and must be replaced.
  • the angular position of rotation of the shafts 19 and 21 are respectively and instantaneously controlled by means of position sensors 29a and 29b, for example of the encoder type, which send corresponding signals to the control unit 31; in this way it is possible to perform the connection between the shaft 19 of the motor 20 and the main shaft 21 in angular positions which may be varied as required, according to a program which is controlled by the control unit 31 depending on the weaving conditions.
  • a third sensor 29c is provided in the vicinity of the weave machine 26, for reading the instantaneous angular position of the driven shaft 25.
  • the electromechanical front clutch 28 allows a plurality of coupling positions separated by a constant angular pitch; said pitch therefore determines the minimum phase shifting level between the driven shaft 25 and the main shaft 21.
  • the above described drive unit also comprises a locking brake 35 which is apt to act upon the main shaft 21 or the shaft 34 and which is activated during the shed searching and weft repairing operations, in order to counteract the residual potential energy of the weaving devices 27; this, in fact, could produce undesirable displacements of said weaving devices with respect to the predefined position upon disengagement of the front clutch 28.
  • the locking brake 35 in addition to increasing the cost and overall dimensions, also has intrinsic operating drawbacks. Since this brake is in fact connected only operationally, by means of the control unit 31 and drive unit 30, to the front clutch 28, it is still possible that, in the event of incorrect or delayed operation of the latter, the brake 35 may be respectively released in advance or actuated with a delay with respect to the engagement/disengagement time of the front clutch 28, therefore momentarily leaving the main shaft 21 of the loom and therefore the weaving devices 27 free to move due to the potential energy accumulated therein.
  • the object of the present invention is therefore that of providing a multi-position clutch of the type indicated above for use in the drive unit of a weaving loom and a braking device associated therewith and apt to steadily keep the main shaft of the loom, or in any case the intermediate shaft connected to the front clutch 28, in the exact position in which disengagement from the front clutch 28 is occurred.
  • Fig. 2 schematically shows a drive unit of the known type which is illustrated in fig. 1 , wherein the front clutch 28 - which, as described above, connects the shaft 19 of the motor 20 to the main shaft 21 of the loom by means of the intermediate shaft 34 - is provided, according to the present invention, with a device for locking the movable element.
  • This locking device consists of a gearwheel 1 integral with the loom and arranged in the immediate vicinity of the movable element 2 of the clutch 28 and coaxial therewith.
  • the gearwheel 1, with respect to which the shaft 34 is idle, can be meshed with the movable element 2 by means of a matching set of teeth formed on the latter and owing to the fact that its axial distance from the movable element 2 is such as to produce complete meshing with the movable element 2, during the normal movement of the latter away from the axially fixed gearwheel 3 of the clutch 28, as described in greater detail below with reference to Figs. 3 and 4 .
  • the front clutch 28 is formed in a manner known per se by an axially fixed gearwheel 3, which is integral and corotating with the shaft 19 of the motor 20, and by a movable gearwheel, or movable element 2, which is integral with the intermediate shaft 34 and axially movable between a position engaged with the gearwheel 3 and a position disengaged from said gearwheel.
  • the front clutch 28 consists of a pair of matching sets of teeth formed on the gearwheels 2 and 3 and each composed of 24 conical axial teeth; the minimum phase-shifting pitch value of the clutch 28 is therefore 15°.
  • the movable element 2 is also provided, on the side facing the fixed gearwheel 1, with a second set of teeth which also have the same pitch of 15°, suitable for engagement with a corresponding set of teeth of the fixed gearwheel 1 in order to form the locking device according to the present invention.
  • Said locking device is preferably formed by sets of teeth comprising straight teeth, in order to ensure a stable grip of the locking device, and said sets of teeth are characterized by a small mutual tangential play in order to facilitate the engagement/disengagement operations thereof.
  • Sets of teeth comprising conical teeth may also be used.
  • the electromagnetic driving means of the movable element 2, with a spring for return into the coupling position of the clutch 28, normally allow a working stroke of said element of about 1.8 - 2.5 mm and preferably 1.8 - 2.0 mm.
  • the axial meshing distance between the conical teeth of the clutch 28 takes about 1.4 - 1.5 mm of this stroke, while the remaining part of the stroke, equal to about 0.4 - 1.0 mm, preferably 0.4 - 0.5 mm, forms the axial play between the movable element 2 and the fixed gearwheel 1 when the clutch 28 is in the coupling position, or between the gearwheel 3 and the movable element 2, when the clutch is in the disengaged position and the movable element 2 has engaged with the fixed gearwheel 1, being locked in the desired position.
  • the axial play of the bilateral clutch is, according to the present invention, less than the axial meshing distance of its teeth (preferably, but not necessarily the same both on the motor side and on the locking device side).
  • the clutch 28 may be engaged both after a certain exact number of cycles of the weave machine and in positions mutually phase-shifted by a constant pitch of 15°.
  • This phase-shifting is reduced, on the main shaft of the loom 21 by the same reduction ratio existing between the gearwheels 22b and 23, such that the minimum phase-shifting pitch on the loom has a value normally in the range between about 4° and 5°, for reduction ratios between the fast shaft (drive shaft 10) and main shaft (shaft 21) of between 3 and 4.
  • Figs. 3 and 4 show in detail, respectively, the various steps of gradual disengagement and gradual engagement of the front clutch 28, which will be briefly described below.
  • Fig. 3A shows the normal operating condition of the loom, where the clutch 28 is in the coupling position, i.e. the movable element 2 is kept in position meshed with the gearwheel 3 by spring means (not shown) provided for this purpose in the clutch itself.
  • the motor 20 drives both the weaving devices 27 and the weave machine 26, which are therefore connected to each other.
  • Fig. 3B shows the first step of disengagement of the clutch 28 where the movable element 2, as a result of the action of the electromagnetic means (not shown) provided in the clutch is moved away from the gearwheel 3, against the action of the abovementioned spring means.
  • This operation may be performed only with the loom at stop and in predetermined angular positions of the main shaft of the loom 21 in which the various components of the weaving devices are in a position such as to allow the free movement of the weave machine and the components operated by the same, so as to be able to carry out searching and replacement of the faulty wefts or adjustment of the phase timing of the weaving devices with respect to the weave machine.
  • the movable element 2 When the loom has therefore been stopped in one of these positions, which can be detected by means of the position sensor 29b, the movable element 2 is displaced. In most cases, in view of the probable situation of non-matching with the fixed gearwheel 1, after a first stroke of 0.4 - 0.1 mm corresponding to the play previously existing with respect to said gearwheel, the movable element 2 comes into abutment, with its axial straight toothing, against the similar set of teeth provided on the fixed gearwheel 1, in a so-called "tooth-to-tooth" position.
  • the motor 20 is operated at a very slow speed until the gearwheel 3 comes into lateral engagement with the movable element 2, driving the latter rotationally, still in the "tooth-to-tooth" position with respect to the fixed gearwheel 1, until, at the most after 15° of rotation, the toothing of the movable element 2 matches with that of the fixed gearwheel 1 ( fig. 3D ), so that the force developed by the electromagnetic means for thrusting the movable element 2 is able to complete the engagement of said element with the fixed gearwheel 1.
  • the motor 20 is actuated with a controlled torque, namely with just that which is sufficient to overcome the rubbing friction, any effect of magnetic attraction occurring, due to the presence of magnetic fluxes, in particular in the "tooth-to-tooth" position between the element 2 and the gearwheel 1, and the potential energy of the weave machine.
  • the desired position of complete engagement is not reached (which position may be easily detected, for example, by the fact that the movement of the weave machine is freed, as a result of disengagement of the gearwheel 3 from the movable element 2)
  • the movement of the motor 20 is reversed ( fig. 3E ) in order to free the toothings and achieve the complete mutual engagement thereof.
  • Proximity sensors may be provided on the movable element 2 in order to detect this complete engagement and enable the successive operations of the weave machine and weft repair.
  • the motor 20 is then operated at a slow speed and with a limited maximum torque - so as to overcome the rubbing friction between the teeth of the gearwheels 2 and 3, any effect of magnetic attraction characteristic of the "tooth-to-tooth" position and the potential energy of the weave machine - until initial meshing of the two sets of conical teeth is achieved ( fig. 4C ), with an angular movement of the gearwheel 3 which in this case, in view precisely of the conicity of the teeth, is always less than the pitch of 15°.
  • the clutch having a locking device of the movable element according to the invention has simply and effectively solved the problem of obtaining the immediate, safe and stable locking of the weaving devices, during the operations for searching and repairing a faulty weft or during an operation for adjustment of the phase timing between said weaving devices and the weave machine.
  • the locking device described here in fact, although controlled by electronic systems, has an operating mode which is purely mechanical and it is therefore impossible for uncontrolled and undesirable phase shifting of the weaving devices to occur in the event of malfunctioning of said electronic systems.
  • there is no position where the movable element 2, and therefore the weaving devices connected to the same is free to rotate with respect to the gearwheel 3 without being already locked by the fixed gearwheel 1.
  • the clutch having a locking device of the movable element according to the present invention is therefore apt to entirely eliminate the locking brake previously incorporated necessarily on the main shaft of the loom, carrying out the functions thereof with an improved performance and considerable reduction in overall dimensions, costs and checking operations, and thus fully achieving the object according to the invention.
  • the shape and number of the teeth of the gearwheels 1, 2 and 3 may be varied, without problems, depending on particular design requirements and/or clutch loads. It is also not necessary for the teeth forming the two sets of co-operating toothings of the movable element 2 and the fixed gearwheel 1 to be equal in number; for example, in the gearwheel 1 a single tooth, or a pair of teeth facing each other at 180° could be envisaged, while the teeth on the gearwheel 2 could consist of a smaller number, so as to be present in adjacent pairs only at the possible positions of the weaving devices where it is possible to start the weft searching, thus resulting in a reduction in weight and lower cost of these components, without the functional nature of the system being modified in any way.

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

Claims (9)

  1. Embrayage avant multiposition dans une unité d'entraînement d'un métier à tisser du type constitué d'une paire de roues dentées coaxiales (2, 3) qui peuvent engrener l'une avec l'autre, l'une (3) desdites roues dentées, qui est fixée axialement, étant reliée à un moteur (20) pour actionner le métier, l'autre (2) desdites roues dentées, qui est mobile axialement de façon à pouvoir engager ou désengager l'embrayage avant, étant reliée aux dispositifs de tissage (27) du métier, caractérisé en ce que ladite roue dentée (2) mobile axialement comporte un second jeu de dents, opposé à un premier jeu de dents qui forme l'embrayage avant, apte à entrer en engagement avec un support denté (1) formé d'un seul bloc avec le métier lorsque l'embrayage avant est dans la position désengagée et vice versa.
  2. Embrayage avant selon la revendication 1, dans lequel le jeu existant entre ladite roue dentée (2) mobile axialement et ledit support denté (1) réalisé d'une seule pièce avec le métier ou ladite roue dentée (3) fixée axialement, respectivement dans les positions engagées et désengagées dudit embrayage avant, est inférieur à la distance axiale d'engrènement desdits jeux de dents.
  3. Embrayage avant selon la revendication 2, dans lequel le jeu est compris dans la plage de 0,4 mm à 1,0 mm, avantageusement de 0,4 à 0,5 mm, ladite distance d'engrènement est comprise dans la plage de 1,4 mm à 1,5 mm et la course de travail de ladite roue dentée (2) mobile axialement est comprise dans la plage de 1,8 à 2,5 mm, de préférence 1,8 à 2,0 mm.
  4. Embrayage avant selon l'une quelconque des revendications 1 à 3, dans lequel lesdits premier et second jeux de dents de ladite roue dentée (2) mobile axialement sont deux jeux de dents comprenant des dents coniques.
  5. Embrayage avant selon l'une quelconque des revendications 1 à 3, dans lequel ledit second jeu de dents de ladite roue dentée (2) mobile axialement est un jeu de dents comprenant des dents droites.
  6. Embrayage avant selon l'une quelconque des revendications précédentes, dans lequel ledit second jeu de dents de la roue dentée (2) mobile axialement a un pas qui est identique à celui dudit premier jeu de dents.
  7. Embrayage avant selon l'une quelconque des revendications précédentes, dans lequel lesdits premier et second jeux de dents ont un pas de 15°.
  8. Embrayage avant selon l'une quelconque des revendications précédentes, dans lequel des moyens capteurs destinés à détecter la position axiale de ladite roue dentée (2) mobile axialement sont en outre prévus.
  9. Embrayage avant selon l'une quelconque des revendications précédentes, dans lequel ledit support denté (1) réalisé d'une seule pièce avec le métier se présente sous la forme d'une roue dentée coaxiale avec ladite roue dentée (2) mobile axialement.
EP01830224A 2001-03-29 2001-03-29 Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser Expired - Lifetime EP1245707B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT01830224T ATE415509T1 (de) 2001-03-29 2001-03-29 Multipositionskupplung mit blockiereinrichtung des beweglichen elementes in einer webmaschinenantriebsvorrichtung
EP01830224A EP1245707B1 (fr) 2001-03-29 2001-03-29 Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser
DE60136686T DE60136686D1 (de) 2001-03-29 2001-03-29 Multipositionskupplung mit Blockiereinrichtung des beweglichen Elementes in einer Webmaschinenantriebsvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01830224A EP1245707B1 (fr) 2001-03-29 2001-03-29 Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser

Publications (2)

Publication Number Publication Date
EP1245707A1 EP1245707A1 (fr) 2002-10-02
EP1245707B1 true EP1245707B1 (fr) 2008-11-26

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EP01830224A Expired - Lifetime EP1245707B1 (fr) 2001-03-29 2001-03-29 Embrayage multiposition avec système de blocage de l'élément mobile dans un dispositif d'entraînement de métier à tisser

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EP (1) EP1245707B1 (fr)
AT (1) ATE415509T1 (fr)
DE (1) DE60136686D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20030817A1 (it) * 2003-04-18 2004-10-19 Promatech Spa Innesto di marcia lenta e ricerca del passo a flusso
ITVI20040129A1 (it) * 2004-05-25 2004-08-25 Smit Spa Dispositivo di comando per telai tessili
CN103628230A (zh) * 2012-08-30 2014-03-12 绍兴文理学院 一种高性能剑杆织机的主动力传递系统
CN109468734A (zh) * 2018-12-13 2019-03-15 浙江泰坦股份有限公司 一种可固定齿轮相对位置的织机驱动装置
JP7401397B2 (ja) 2020-06-04 2023-12-19 津田駒工業株式会社 織機
JP7477372B2 (ja) * 2020-06-04 2024-05-01 津田駒工業株式会社 織機
JP7384747B2 (ja) 2020-06-04 2023-11-21 津田駒工業株式会社 織機

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1004064A3 (nl) * 1989-06-29 1992-09-15 Picanol Nv Weefmachine met vergrendeling.
BE1004896A3 (nl) * 1991-05-23 1993-02-16 Picanol Nv Werkwijze en inrichting voor het aandrijven van een weefmachine gedurende de traagloop.
BE1009097A3 (nl) * 1995-02-07 1996-11-05 Picanol Nv Weefmachine met aandrijving.
FR2755155B1 (fr) * 1996-10-25 1998-12-11 Warner France Dispositif formant accouplement a deux embrayages en particulier pour un metier a tisser

Also Published As

Publication number Publication date
DE60136686D1 (de) 2009-01-08
EP1245707A1 (fr) 2002-10-02
ATE415509T1 (de) 2008-12-15

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