EP2345756A1 - Steuereinheit für die Luftversorgung in einer Relaisdüse einer Luftdüsenwebmaschine - Google Patents

Steuereinheit für die Luftversorgung in einer Relaisdüse einer Luftdüsenwebmaschine Download PDF

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Publication number
EP2345756A1
EP2345756A1 EP10150932A EP10150932A EP2345756A1 EP 2345756 A1 EP2345756 A1 EP 2345756A1 EP 10150932 A EP10150932 A EP 10150932A EP 10150932 A EP10150932 A EP 10150932A EP 2345756 A1 EP2345756 A1 EP 2345756A1
Authority
EP
European Patent Office
Prior art keywords
control valve
valve unit
shut
air
conduits
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.)
Withdrawn
Application number
EP10150932A
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English (en)
French (fr)
Inventor
Christoph Jenne
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.)
Itema Switzerland Ltd
Original Assignee
Itema Switzerland Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Itema Switzerland Ltd filed Critical Itema Switzerland Ltd
Priority to EP10150932A priority Critical patent/EP2345756A1/de
Priority to PCT/EP2011/050357 priority patent/WO2011086103A1/en
Publication of EP2345756A1 publication Critical patent/EP2345756A1/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3026—Air supply systems
    • D03D47/306—Construction or details of parts, e.g. valves, ducts

Definitions

  • the invention relates to an air flow control unit for a relay nozzle in air-jet looms, in particular a control and air pressure adjustment unit for a relay nozzle in a multi-weft yarn weaving loom.
  • the different pressure conditions are achieved by using a plurality (typically two or more) of air tanks and valves arranged in parallel, upstream of the nozzles.
  • the disadvantage of this method is the increased cost of materials, since all units such as valves, power electronics and air tanks must be multiplied in number several times.
  • the disadvantage of the first as well as of the second mentioned approach is the inefficient use of energy or material. Moreover, by the known systems it is not possible to set an optimal, freely programmable pressure field along the weaving loom width (better, along the reed channel) or to set different pressure levels inside the same weft insertion cycle, because the reaction speed of the valves is not sufficient.
  • the object of the present invention is hence that of providing a relay nozzle control and adjustment system in an air jet weaving loom, which is cost-effective in all respects, in particular which does not require component duplications, and which has a prompt reaction at high speed, so as to open/close the flow and adapt the pressure level to the one desired within a short delay, even shorter than the ones typical of a weaving loom cycle.
  • a relay nozzle control and adjustment system which consists of a single unit wherein a pressure adjusting element and an open-and-close element are combined, each element being shaped as a two-way valve which can be switched independently from the other and at a high operation frequency, at least the second one at a greater frequency than the operation frequency of the weaving loom.
  • the system can also be implemented in such a way that both the pressure adjusting and the open-and-close elements are two open-and-close (switching) elements, the latter being used to open and close the flow from the unit and the former to open and close various air inlet conduits in the unit and having different flow rates.
  • both the pressure adjusting and the open-and-close elements are two open-and-close (switching) elements, the latter being used to open and close the flow from the unit and the former to open and close various air inlet conduits in the unit and having different flow rates.
  • the first pressure control element is designed as a controlled throttle with different diameter apertures which are selectively closed/opened by at least one piezoelectric bending element.
  • the pressure adjustment function is preferably implemented in the form of flow openings with different diameter and selected according to different (for example three) switch positions of a piezoelectric bending element.
  • the bending transducer element For the highest pressure level (flow rate equal to the sum of the two flow rates of the two apertures) the bending transducer element is in a neutral central position, for medium and low pressure levels the bending transducer is deflected into the two extreme positions and covers - depending on the selected pressure level - the smaller or the larger aperture, respectively. Due to the substantially static conditions of the closed system, the opening or the closing of flow holes having different diameter translates correspondingly into a pressure increase or decrease in a delivery duct of the unit and in turn on the relay nozzles.
  • valve in the version with at least two open-and-close elements, in the closed position all holes are closed. Depending on the desired pressure level, one or more holes are open at any one time, until all the holes are open at the same time, which leads to reach the maximum pressure.
  • an air delivery system for air relay nozzles in a weaving looms comprising a plurality of consecutive control valve units as above described, each of said units being independently operated so as to cause a programmable pressure level along the reed channel of the loom. Additional aspects of the invention are disclosed in the appended claims.
  • the unit with which the present invention deals hence ends with an outlet which can be connected to one or more relay nozzles of a weaving loom, the outlet typically being in the form of a conduit which branches preferably into two to four sub-conduits (one for each connected nozzle) having a mutually equal diameter, mutually slightly converging, in a delivery head which the actual nozzles is intended to be connected with.
  • Fig. 1 shows such control and adjustment valve unit, which consists of a basic body 1 which a cover 2 is coupled with, which cover carries delivery head 3.
  • the airtight coupling between cover 2 and basic body 1 is accomplished by detachable means, such as four stud bolts, possibly arranging a seal (not shown) between body 1 and cover 2.
  • an inlet hole 4 through which compressed air (for example at a substantially constant pressure of 2-7 bar) is introduced in the unit, which air flows towards an inner conveying chamber which will be described in detail further on.
  • the inlet hole 4 can be connected to a standard air supply, comprising air tank and valves according to any conventional technique.
  • a pressure adjusting element and - preferably downstream of the same - a shut on/off or open/close element.
  • the former of the two elements has the function of determining the desired pressure level, while the latter element determines the closing/opening of the valve unit, i.e. of the air delivery towards the air jet nozzle.
  • the two functions are taken by two different elements within the same unit, which allows to make air pressure adjustment and control more efficient, in compliance with the requirements desired for a relay nozzle: in particular, it allows to reduce as far as possible the internal air volume in the unit between the pressure regulator element and the shut on/off element. This feature lead to minimize the pressure peak after opening of the second shutter element, due to the system pressure (up to 7 bar) being inside the switching volume.
  • the switching speed of the adjusting pressure element can be even lower (in the order of the weaving loom operation frequency) than the switching speed of the shut on/off element which must be higher than the weaving loom frequency, so as to be able to switch even multiple times within the same weft insertion cycle.
  • operation frequency of the weaving loom the number of operation cycles of the weaving loom (i.e. the number of weft yarn insertions) per time unit is intended.
  • the pressure adjusting element is preferably formed as a shutter suited to alternately close internal calibration conduits having mutually different diameters.
  • inlet hole/conduit 4 opens inward into a hoof-shaped internal conveying chamber 5.
  • calibration conduits 5a and 5b depart, having different diameter, which open into a same switching area 6.
  • Switching area 6 is furthermore in communication with a delivery conduit 7 of head 3, where the shut on/off element is instead arranged.
  • a delivery conduit 7 is provided in the cover 2, with a main axis perpendicular to the axis of calibration conduits 5a and 5b.
  • an adjusting element is movably arranged as a shutter capable - suitably driven from the outside - of alternately shutting calibration conduit 5a or 5b, or neither of the two.
  • the diameter of entry hole 4 is in the order of 5-15 mm.
  • the diameter of the calibrated holes or controlled throttles is ideally between 0.5-6 mm. The size of these holes depending also on the number of relay nozzles connected to the same valve unit.
  • the shutter can be of various types, according to a preferred embodiment of the invention it is shaped as a piezoelectric actuator.
  • the pressure adjusting element is shaped as a flexible piezoelectric lamina designed so that it can bend on either side based on the applied electric voltage.
  • the actuator comprises a root base 10 wherefrom a flexible lamina 11 departs, which can be driven piezoelectrically.
  • a shutter button 12 can be provided, for example of rubber or elastomeric material better suited to seal the exit of calibration conduits 5a and 5b.
  • the piezoelectric shutter is mounted in the base body 1 so that root base 10 is flush with the external wall of body 1 (fixed in a respective seat by an adhesive or by soldering), so as to be able to easily connect the electric supply cables which come from outside the unit.
  • the lamina 11 is mounted cantilevered within a cavity of body 1, so as to be free to oscillate, with shutting button 12 arranged in the middle of switching chamber 6 in correspondence of calibration conduits 5a and 5b.
  • the driven oscillation of flexible lamina 10 brings shutting button 12 to alternately obstruct one calibration conduit or the other.
  • this second flexible-lamina actuator is arranged so that the oscillation axis is orthogonal to the one of the first pressure adjusting actuator.
  • the second actuator hence consists of a root base 10' which is mounted again flush with the external surface of the unit, adjacent to root base 10 of the first actuator but twisted by 90°.
  • Base 10' is tightened between base body 1 and cover 2 and has a flexible lamina 11' whose main surface lies parallel and in the proximity of the separation plane between base 1 and cover 2.
  • a shutting button 12' intended to obstruct the entry port of delivery conduit 7.
  • this shutter is intended to open/close a single port (and not two opposite ports, as in the case of the pressure adjusting shutter), the distance which button 12' must travel and hence the oscillation width of the lamina, can be smaller (typically half of those required by the pressure adjusting element).
  • the control of this piezoelectric actuator can also be provided to cause a deflection of the lamina in a single direction, the oscillation in the opposite direction being ensured by the elastic return force of the lamina.
  • the lamina is mounted to keep closed, in the home position, delivery conduit 7 (hence relay nozzle off), while it is deflected only upon electric energisation, opening upon control delivery conduit 8 (hence relay nozzle on). Or viceversa.
  • shut on/off element can hence drive the opening and closing of the relay nozzle also several times within the same weft insertion cycle, as desired.
  • Fig. 5 - wherein base body 1 and cover 2 are separated merely for ease of representation's sake - shows the development of air flows as well as the (mutually perpendicular) oscillation directions of the laminae of the two shutters.
  • Figs. 6-9 show another embodiment of the unit according to the invention, further employing two piezoelectric actuators.
  • base body 100 is configured in a way substantially identical to the previous embodiment, but both shutter elements are flexible along the same axis and both act as pressure adjuster and as shut on/off element at the same time.
  • two flexible laminae 111 and 111' are arranged within the same switching chamber of the base body 100, side by side and parallel to each other; the respective shutting buttons 112 and 112' are arranged in the proximity of two different calibration conduits having different diameter, arranged opposite to each other as in the previously described embodiment.
  • each actuator through a short travel, causes the respective shutting button 112 or 112' to alternatively obstruct either one of the calibration conduits, or both simultaneously, or neither one.
  • the closed condition of the valve unit is obtained (an additional closing/opening element acting on the delivery conduit is not required), while in all other three conditions the opening of the valve unit is accomplished according to three different pressure levels.
  • the short run required to obstruct or open calibration conduits 105a and 105b allows to obtain fast operation: hence both a pressure adjustment function and a shut on/off function can be performed at a greater frequency than the weaving loom operation one.
  • Fig. 10 - wherein base body 100 and cover 102 are separated merely for ease of representation's sake - shows with arrows the development of air flows, as well as the oscillation directions (in this case, in the same plane) of the laminae of the two shutter elements.
  • the unit according to the invention it is possible to obtain a particularly effective air pressure adjustment and an opening/closing of the relay nozzle with limited construction costs.
  • a single combined pressure adjusting and switching valve unit is able, within a few milliseconds - namely 3 to 5 ms - to switch from a 3-bar pressure level to 5 bars or to perform several open-and-close switching cycles within the same cycle time.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP10150932A 2010-01-18 2010-01-18 Steuereinheit für die Luftversorgung in einer Relaisdüse einer Luftdüsenwebmaschine Withdrawn EP2345756A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10150932A EP2345756A1 (de) 2010-01-18 2010-01-18 Steuereinheit für die Luftversorgung in einer Relaisdüse einer Luftdüsenwebmaschine
PCT/EP2011/050357 WO2011086103A1 (en) 2010-01-18 2011-01-12 Control unit for air supply in a relay nozzle of an air jet weaving loom

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10150932A EP2345756A1 (de) 2010-01-18 2010-01-18 Steuereinheit für die Luftversorgung in einer Relaisdüse einer Luftdüsenwebmaschine

Publications (1)

Publication Number Publication Date
EP2345756A1 true EP2345756A1 (de) 2011-07-20

Family

ID=42238258

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10150932A Withdrawn EP2345756A1 (de) 2010-01-18 2010-01-18 Steuereinheit für die Luftversorgung in einer Relaisdüse einer Luftdüsenwebmaschine

Country Status (2)

Country Link
EP (1) EP2345756A1 (de)
WO (1) WO2011086103A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102995235A (zh) * 2012-11-26 2013-03-27 吴江市金真缝纫机有限公司 喷气织机可调压喷嘴

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1201805A2 (de) * 2000-10-30 2002-05-02 Kabushiki Kaisha Toyota Jidoshokki Drosselklappe und Schussfadeneintragsvorrichtung für eine Luftdüsenwebmaschine mit einer solchen Vorrichtung
WO2007057217A1 (en) * 2005-11-21 2007-05-24 Picanol N.V. Method for introducing a weft thread in an air weaving machine and air weaving machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1201805A2 (de) * 2000-10-30 2002-05-02 Kabushiki Kaisha Toyota Jidoshokki Drosselklappe und Schussfadeneintragsvorrichtung für eine Luftdüsenwebmaschine mit einer solchen Vorrichtung
WO2007057217A1 (en) * 2005-11-21 2007-05-24 Picanol N.V. Method for introducing a weft thread in an air weaving machine and air weaving machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102995235A (zh) * 2012-11-26 2013-03-27 吴江市金真缝纫机有限公司 喷气织机可调压喷嘴

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Publication number Publication date
WO2011086103A1 (en) 2011-07-21

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