EP0882824B1 - Mechanism to select the slow running condition and find the pick in weaving looms - Google Patents

Mechanism to select the slow running condition and find the pick in weaving looms Download PDF

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Publication number
EP0882824B1
EP0882824B1 EP98110018A EP98110018A EP0882824B1 EP 0882824 B1 EP0882824 B1 EP 0882824B1 EP 98110018 A EP98110018 A EP 98110018A EP 98110018 A EP98110018 A EP 98110018A EP 0882824 B1 EP0882824 B1 EP 0882824B1
Authority
EP
European Patent Office
Prior art keywords
gear
main
gearwheel
slow running
loom
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
EP98110018A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0882824A1 (en
Inventor
Angelo Gallizioli
Maurizio Belingheri
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
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP0882824A1 publication Critical patent/EP0882824A1/en
Application granted granted Critical
Publication of EP0882824B1 publication Critical patent/EP0882824B1/en
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
    • D03D51/14—Driving, starting, or stopping arrangements; Automatic stop motions for reducing speed temporarily
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/005—Independent drive motors
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/007—Loom optimisation

Definitions

  • the present invention concerns a mechanism to connect the main shaft of a loom with the loom weave machine and with the slow running control of said loom.
  • it concerns a so-called mechanism to select the slow running condition and find the pick in looms.
  • the main shaft of a loom controls also the weave machine (dobby, jacquard or cam machine) working with said loom.
  • the weave machine dabby, jacquard or cam machine
  • it may be required to stop the working of the loom it is indispensable to subsequently be able to carry out some loom picks in slow running conditions, eventually going in reverse, so as to locate the fault or inconvenience, and then start again in steady running conditions without leaving defects in the fabric.
  • the loom is equipped with an auxiliary motor which acts, through an appropriate kinematic chain with high reduction ratio, on the shaft of the weave machine.
  • auxiliary motor it is however necessary for the auxiliary motor to be able to act only in slow running conditions and to then be excluded during the steady running conditions of the loom.
  • a slow running clutch is provided for the purpose, to connect the auxiliary motor with the weave machine only when the slow running conditions are set.
  • the stopping, maintenance and restarting of the loom require the motion of the weave machine to be independent from that of the main shaft of the loom: for example, when a faulty weft insertion occurs, it should be possible to cause the weave machine to perform an appropriate motion, keeping the main shaft idle, so as to open the shed and pull out the faulty weft yarn, without a new weft yarn being inserted by the weft insertion device controlled by the main shaft of the loom.
  • the main shaft of the loom and the shaft of the weave machine are connected through a main coupling clutch.
  • Said clutch should not only determine or exclude the connection, but should also guarantee for the connection to be univocally determined, namely for the phase angle between the two shafts to be always the same, so that the loom cycle may be constantly repeated to answer the requirements of the fabric pattern.
  • this is obtained in different ways, one of the most common ways being to adopt a pin, fixed onto one of the two portions of the clutch and engaging into a seat therefor formed into the other portion of the clutch.
  • the step wherein - with the loom in slow running conditions - the pin is moved up to being brought in correspondence of its seat, is called "pick finding" step, and this is how it will be indicated hereinafter.
  • Mechanisms of this type are known in technique, and have different and more or less complicated structures.
  • the double clutch substantially consists of two plane bevel gears (i.e. bevel gears developing on a plane) mounted as a sandwich and moved, so as to mesh, axially one against the other, according to appropriate working schemes.
  • the main loom shaft and the shaft of the weave machine are coaxial and face each other with one of their ends.
  • Said first plate is apt to axially translate in respect of its rotor, under the opposing action of a combination of flat and thrust springs, and of an electromagnet fixed onto an external box, which develops a magnetic field through the rotor, such as to attract the toothed plate.
  • the thrust springs are apt to press the first toothed plate against a second rotor with plane bevel toothing, fixed at the opposite end of the shaft of the weave machine, thus ensuring the engagement of the main clutch.
  • a pin coupling system is moreover provided between the second rotor and the first translatable plate, said system allowing an univocal mesh between the plane bevel toothings of the plate and of the second rotor.
  • a second translatable plate with plane bevel toothing apt to mesh - again under the opposing action of springs and of an electromagnet - with a plane bevel gear, coaxial to the two rotors but idle in respect thereof.
  • This last gear comprises, over its circumference, a toothing apt to mesh with a worm screw operated by an auxiliary motor.
  • the meshing between the second plate and the plane bevel gear represents the slow running clutch.
  • the plane bevel gears are rather critical in transmitting a torque, as the teeth profiles impart on the gear an axial thrust, which is inclined to disengage the clutch when they undergo a tangential stress deriving from the application of a torque; consequently, the gears should be kept pressed one against the other with a strong axial force imparted by preloaded springs.
  • the higher the torque meant to be applied the stronger will need to be the axial compressive stress being imparted on the gears of the clutch. This inevitably introduces design limits.
  • the flat springs - used both to allow the translation of the toothed plate in respect of the corresponding rotor, and to provide a certain coupling thrust - form a very delicate element of the mechanism. Without taking into account the fact that they introduce the presence of a critical elasticity in the clutch, which is apt to create problems of vibrations and unsteadiness in the coupling.
  • translatable plates interposed between the rotors requires to adopt electromagnetic actuators apt to act thereon, thanks to the magnetic field, even through the thickness of the actual rotating gears.
  • electromagnets does not allow to perform translation strokes exceeding 1 ⁇ 2 mm, and this no doubt represents a considerable drawback, as it makes it indispensable to adopt gears with a plane bevel toothing which, besides involving the already cited drawback, are more costly than the common spur gears.
  • the worm gear used to transmit the motion of the auxiliary motor has a very low efficiency and thus requires the use of a powerful auxiliary motor. Besides, also this gear is a costly component.
  • the object of the present invention is to overcome said drawbacks.
  • it is meant to supply a mechanism allowing to determine and exclude the connection between the main shaft of the loom and the shaft of the weave machine, and between the shaft of the weave machine and an auxiliary slow running motor, by means of a double gear clutch which is simple and economic, which may be operated both by electromagnetic means and by hydraulic or pneumatic means, and in which the use of gearings with plane bevel toothings is reduced to a minimum (concerning this last aspect it should be noted that, in spite of the drawbacks and costs involved, plane bevel toothings are still considered at present an unreplaceable solution in this field of technique).
  • a mechanism to select the slow running condition and find the pick in weaving looms - of the type comprising a double gear clutch wherein a driven gear, fixed to a shaft transmitting the motion to a weave machine, is apt to alternately or simultaneously mesh with a main gearwheel, transmitting the motion from and to the main shaft of the loom, and with a slow running gear receiving the motion from an auxiliary motor - in which, both the main gearwheel and the slow running gear are formed of a single body and are apt to perform an axial translation, and in which, at least the meshing between said driven gear and said slow running gear takes place in the manner of a spur gearing.
  • the mechanism of the present invention substantially comprises two gear clutches: a first main clutch I 1 , which connects the main shaft P of the loom with the shaft of the weave machine A; and a second slow running clutch I 2 , which connects an auxiliary motor m to the shaft of the weave machine A.
  • the main clutch I 1 and the slow running clutch I 2 are positioned offset one in respect of the other, and in respect of the main loom shaft P, according to a structure which could be defined “cantilevered", for reasons which will appear evident hereinafter.
  • the clutch I 1 consists of two gearwheels 1 and 2, apt to mesh through plane bevel toothings 3, and mounted coaxial onto a same shaft 4.
  • the outer gearwheel 1 - or main gear-wheel - is formed of a single body, apt to perform an axial translation. It is in fact mounted on the shaft 4 by way of needle bearings 5 and onto a case 6 by way of a radial roller bearing 7, having an axial slack, so as to allow the gearwheel 1 to freely perform an axial translation.
  • the inner gearwheel 2 - or driven gear - is formed of a single body.
  • an actuator acts on the outer gearwheel 1, in opposition to the springs 8, to disengage the clutch I 1 by parting the main gearwheel 1 from the driven gear 2 (fig. 4).
  • said actuator is a hydraulic actuator 10: the gearwheel 1 comprises a hub 1a extending so as to form, at one end thereof, a piston 11 into a pressure chamber 12, oil under pressure being fed into said chamber. Sliding gaskets 12a and 12b are provided to ensure the seal.
  • said actuator is an electromagnetic actuator 50, the magnets acting directly onto the outer gearwheel 1 in opposition to the springs 8.
  • the gearwheels 1 and 2 also comprise, over their circumference, a conventional spur gearing apt to mesh, respectively, with a spur gear 13 fixed to the main loom shaft P, and with a slow running gear 14.
  • the toothing provided on the spur gear 13 is sufficiently long to be in constant mesh with the main gearwheel 1, even when this latter translates into the position of disengagement from the driven gear 2 (fig. 4): this prevents from missing the correct phase angle between the main shaft P and the main gearwheel 1 of the clutch I 1 . Furthermore, the phase angle between the gearwheel 1 and the driven gear 2 is univocally determined, for example, by a conventional pin coupling (not shown).
  • the clutch I 2 is instead formed by meshing of the spur gear 2 with the slow running gear 14.
  • said gear 14 is a spur gear, formed of a single body apt to perform an axial translation by way of a second actuator 15.
  • the slow running gear 14 is caused to rotate by the auxiliary motor m through a driving gear 16 - having a sufficiently long toothing to keep in constant mesh with the gear 14 through all its positions of axial translation - and eventually by a reduction gear 17.
  • the auxiliary motor m or the kinematic chain connected thereto, should be provided with a brake (not shown) apt to oppose the torque applied by the weave machine A.
  • the load of the weave machine is variable in time and, in particular cases (jacquard, negative dobby), due to the presence of return springs, an acceleration torque is applied on the auxiliary motor, which torque may be troublesome in the pick finding step.
  • a brake apt to slow down the rotation speed of the driven gear 2 proves to be advantageous.
  • the auxiliary motor m is a variable-speed motor. This allows to work at a minimum speed in critical slow running conditions (for example, during insertion of the coupling pin into its seat), and at a higher speed in other slow running conditions, thereby reducing even further the overall dead times of the loom.
  • the speed variation of the auxiliary motor m can be obtained, for example, by varying the frequency of the supply current.
  • the meshing in the clutch I 1 takes place in the manner of a spur gearing, being obtained - for example - between an outer spur toothing 61, formed on the gearwheel 1, and an inner spur toothing 62, formed on the gearwheel 2, said toothings engaging frontally.
  • thrust springs 8 it is no longer necessary to use thrust springs 8, and the axial translation of the gearwheel 1 can be obtained through an actuator 63 with double-acting hydraulic piston.
  • the present invention is thus apt to fully accomplish the proposed objects, providing a series of advantages in respect of prior art.
  • the cantilevered structure of the mechanism according to the invention allows to adopt spur gears which, besides being component parts of the clutches I 1 and I 2 (as the gearwheels 1 and 2, and the slow running gear 14), also form part of the kinematic chain to reduce the gear ratio, thereby obtaining a real economy of components of the mechanism, as well as an appreciable structural simplicity. Moreover, it is consequently no longer indispensable to obtain the whole reduction ratio on a single gear pair (for example, worm and pinion gears), to the full advantage of driving efficiency.
  • the gearwheels 1 and 2 are in a single body - i.e. having no translatable plates with plane bevel toothings, as in EP-B1-322.928 - which allows to eliminate delicate components, as the actual plate and the flat springs; this also leads to more freedom in the choice of the actuators, which no longer need to be electromagnetic, to act through the thickness of the gearwheels, but which can be of a different type (hydraulic, pneumatic, with linear motor, and so on), with undeniable advantages as far as forces and shifting possibilities.
  • a hydraulic actuator 10 allows the main gearwheel 1 to perform an axial stroke which is positively longer than that allowed by an electromagnetic actuator: this helps, not only to determine or exclude the engagement of the clutch I 1 , but also to obtain the disengagement of the gearwheel 1 from the spur gear 13.
  • the advantages thus provided are the possibility to disengage the gears 1 and 13, find a new phase angle between them, and subsequently reset the mesh, by simply increasing, beyond a desired disengagement value, the normal stroke imparted by the actuator 10 onto the gearwheel 1: this finally allows to change the phase angle between the main shaft P and the weave machine A when requiring to change the type of fabric weave, while keeping the same mesh between the gears 1 and 2 during the normal loom maintenance operations.
  • the adjustment of the new phase angle, once the gears 1 and 13 have been disengaged, can be manually operated for instance by acting on a control wheel with rating notches, visible to the operator, or it can be obtained by electronic systems, for example by comparing the signal issued by two control devices - such as conventional encoders - fixed, respectively, to the main shaft P of the loom and to the shaft 4 transmitting the motion to the weave machine A, such devices being apt to supply a reading of the phase angle between said shafts P and 4.
  • the electronic type of adjustment is preferable, as it allows to create an electronic file wherein, to each woven article, there is associated a respective phase angle.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP98110018A 1997-06-03 1998-06-02 Mechanism to select the slow running condition and find the pick in weaving looms Expired - Lifetime EP0882824B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI001305A IT1292069B1 (it) 1997-06-03 1997-06-03 Dispositivo di selezione della marcia-lenta e di ricerca del passo in telai di tessitura
ITMI971305 1997-06-03

Publications (2)

Publication Number Publication Date
EP0882824A1 EP0882824A1 (en) 1998-12-09
EP0882824B1 true EP0882824B1 (en) 2002-04-17

Family

ID=11377282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98110018A Expired - Lifetime EP0882824B1 (en) 1997-06-03 1998-06-02 Mechanism to select the slow running condition and find the pick in weaving looms

Country Status (4)

Country Link
EP (1) EP0882824B1 (enrdf_load_stackoverflow)
DE (1) DE69804900T2 (enrdf_load_stackoverflow)
ES (1) ES2176856T3 (enrdf_load_stackoverflow)
IT (1) IT1292069B1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1297940B1 (it) * 1997-12-23 1999-12-20 Vamatex Nuova Spa Meccanismo perfezionato di selezione ed innesto della marcia-lenta e di ricerca del passo
CN101058917B (zh) * 2007-05-26 2010-11-03 万祖干 离合器分离型大扭矩织机倒综机构
CN103981615B (zh) * 2014-05-15 2015-08-19 浙江理工大学 一种提花织机的慢车驱动系统
CN110893698B (zh) * 2018-09-13 2025-06-20 上海旭恒精工机械制造有限公司 一种用于控制糊盒机带板移动的机构

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1390377A (en) * 1971-05-07 1975-04-09 Nuovo Pignone Spa Looms
BE899346A (nl) * 1984-04-06 1984-10-08 Picanol Nv Schotzoekinrichting voor weefgetouwen.
IT1223621B (it) * 1987-12-30 1990-09-29 Baruffaldi Spa Giunto a doppio innesto, particolarmente per telai da tessitura

Also Published As

Publication number Publication date
ES2176856T3 (es) 2002-12-01
EP0882824A1 (en) 1998-12-09
IT1292069B1 (it) 1999-01-25
DE69804900T2 (de) 2002-10-31
ITMI971305A1 (it) 1998-12-03
DE69804900D1 (de) 2002-05-23
ITMI971305A0 (enrdf_load_stackoverflow) 1997-06-03

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