US3670778A - Pneumatic warp thread monitoring apparatus - Google Patents

Pneumatic warp thread monitoring apparatus Download PDF

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Publication number
US3670778A
US3670778A US104554A US3670778DA US3670778A US 3670778 A US3670778 A US 3670778A US 104554 A US104554 A US 104554A US 3670778D A US3670778D A US 3670778DA US 3670778 A US3670778 A US 3670778A
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Prior art keywords
air
flow
air flow
warp thread
channel
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Expired - Lifetime
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US104554A
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English (en)
Inventor
Ghert Meier
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Rheinmetall Air Defence AG
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Oerlikon Contraves AG
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/20—Warp stop motions

Definitions

  • a channel system 18 arranged beneath each row 52 uses 157 thread mnitring and upon rupture relevant warp thread the corresponding lamella drops into this [58] Field of139/336, 349, 350, 353, 358,
  • the present invention broadly relates to loom stop motions, and, more particularly.
  • each properly tensioned warp thread piercingly extends through an associated thread monitoring lamella or blade and retains such lamella in an elevated position, and upon rupture of the relevant warp thread this lamella drops into a lower position. thereby placing into operation a triggering mechanism for indicating a fault condition of the loom, as by sounding an alarm or stopping the loom.
  • the lamella consist of sheet metal equipped with an elongate hole or aperture at the portion thereof disposed above the threading eyelet for the warp thread.
  • a rail or bar piercingly extends through the elongate hole.
  • This rail consists of three parallel electrically insulated metal strips, the outer ones of which are electrically coupled to one pole or terminal source and the inner one of which is connected to the other pole or terminal of an electrical current circuit controlling the triggering mechanism.
  • a primary objective of the instant invention is directed to the provision of warp thread monitoring apparatus which effectively and reliably fulfils the existing need and is not associated with the aforenoted disadvantages existing in prior art stop motion equipment.
  • Another more specific object of the present invention relates to a stop motion device for looms, particularly for shutting down the loom and/or indicating an alarm condition upon rupture of one or more of the warp threads, wherein operation of the stop motion equipment itself is extremely rapid, after occurrence of the fault condition, and positively and reliably indicates malfunction of the loom.
  • Yet a further significant object relates to an improved stop motion device for monitoring warp threads at looms, which device is relatively simple in construction, extremely reliable in operation, provides for rapid monitoring of the momentarily existing operating conditions of the loom, and affords nondelayed triggering of an alarm and/or shutdown of the loom upon occurrence of a malfunction thereat.
  • a channel arrangement is advantageously disposed beneath the row of thread monitoring lamellae, a longitudinally directed air current being forced through such channel arrangement.
  • Each lamella when no longer supported by its associated warp thread drops into the channel arrangement, causing interruption of the air flow to the outlet end of such channel arrangement so that through the use of a flow controlled-pneumatic element, upon interruption of the flow of air through the channel arrangement, each warp thread rupture can be ascertained most reliably and used to activate the associated triggering mechanism.
  • the inventive warp thread monitoring apparatus contemplates the provision of a channel arranged beneath each row of thread monitoring lamellae. Upon occurence of a defective condition of a warp thread, typically rupture, the associated lamella drops into the channel, interrupting an air current forced from the inlet side of such channel towards the outlet side thereof. This in turn controls operation of an associated pneumatic flow sensing device which influences a trigger mechanism.
  • FIG. I is a schematic side view in cross-section of a preferred embodiment of warp thread monitoring device for a group of warp threads, the sectional view being taken substantially along the line II of FIG. 2.
  • FIG. 2 is an elevational view of the warp thread monitoring device depicted in FIG. I as viewed substantially along the line IIII thereof;
  • FIG. 3 schematically illustrates details of a fluidic sensing device with a subsequently arranged pneumatic OR-gate for evaluation of the operating conditions of the equipment depicted in FIG. 1.
  • FIGS. I and 2 there will be recognized a channel system I consisting of a plurality of substantially aligned linearly extending channel members 11, 12, I3, etc.,each of which possesses a substantially U-shaped configuration in cross-section. Between each two neighboring channel members, such as channels ll, 12, and 12, 13 there is arranged an intermediate tubular member or pipe 2, the construction and operation of which will be more fully considered hereinafter.
  • a lamellae support rail 3 is mounted above the channel system I and in substantial parallelism with respect thereto. This support rail 3 piercingly extends through the upper elongate holes or slots 40 of a multiplicity of warp thread lamellae or blades 4 of known construction.
  • warp thread apertures 41 of all the lamellae 4 are pierced by a respective warp thread K.
  • All of the warp threads K extend in parallelism to one another between the support rail 3 and the channel system I and specifically in a transverse direction with respect to these components, as best indicated by referring to FIG. I.
  • each warp thread K is properly tensioned then such warp threads will retain the associated lamella 4 in its corresponding raised or elevated position.
  • a warp thread has ruptured, for instance as indicated in FIG.
  • the relevant lamella 4 will then drop down until it remains suspended between two neighboring teeth of the row of teeth 30 provided at the upper side of the support rail 3, which rail can be moved toand -fro in its lengthwise direction, as indicated by the double-headed arrow appearing at the right of FIG. I.
  • the lower portion of the corresponding lamella 4 blocks the flow of an air current through the relevant channel member of the channel system 1.
  • an air current is forced or blown through each channel member 11, I2, 13 and so forth from the left towards the right of the channel system 1.
  • This air current can move freely from the inlet side of the channel system, at the left of FIG. I, to the outlet side thereof, at the right of FIG. 1, so long as none of the lamellae 4 associated with the corresponding channel member drop into their lowered position because of thread rupture, to thus block or impede air flow through such channel member.
  • the air needed to produce the moving air current can be furnished from any suitable compressed air container or source, which for convenience in illustration has not been particularly depicted in the drawings, the air then moving through the intermediate air supply tubes 2, the upper respective ends of which are conveniently connected to such compressed air supply container means or to compressed air supply conduits through the agency of a suitable connection, such as a hose or equivalent device.
  • each intermediate hollow tube 2 sub-divides each such supply tube 2 into a first chamber or compartment 22 and a second chamber or compartment 23.
  • the left-hand side compartment 21 of each intermediate tube 2 communicates by means of an aperture or bore 24 with the flow region of the corresponding channel member 11, 12 or 13 located to the left of such intermediate supply tube.
  • the compartments 22 and 23 will be seen to extend substantially transversely with respect to the direction of air flow through the channel system 1.
  • each intermediate air supply tube 2 leading from the compartment 23 at the right-hand side of each intermediate air supply tube 2 is an appropriately configured aperture or hole 25 communicating with the downstream arranged channel member 12 or 13, and so forth. located at the right side of each such intermediate tube 2 in the arrangement of FIG. I. Compressed air flows continuously out of the supply source through the upper portion of the air supply tube 2 and then initially through the compartment 23, through the associated discharge opening 25 and then into the portion of the channel system I located to the right of the corresponding intermediate supply tube 2.
  • each intermediate tube member 2 is provided at its outer walls with the openings or apertures 26 and 28, as shown, and at the intermediate partition wall 21 with the further opening or aperture 27. At least the apertures 26 and 27 are aligned with one another. Again as best seen by referring to FIG.
  • each such constricted portion 50 there is provided a transversely extending line or channel 51 which leads to a sensing outlet line or conduit 52.
  • the jet of air emanating from the nozzle-like constricted portion 50 is thus ejected or blown out of the conduit 5 through the confronting aperture or hole 26 into the compartment 22 of the next arranged tube member 2 as appear in the direction of air flow.
  • a counter aircurrent or jet is ejected or blown from the opposite side of the nozzle-like constricted portion 50, in other words downstream thereof, and specifically, through the aperture 27 at the intermediate wall 21 and into the compartment 22.
  • FIG. 3 illustrates at the left side thereof a flow controlledfluidic element or component 6 equipped with a supply line or conduit 60 and two outlet lines or conduits 61 and 62, as well as a control conduit 52 merging at the branch-ohlocation of the outlet conduits 61 and 62, that is, such control conduit representing the sensor outlet conduit 52 of the arrangement of FIG. 1.
  • conduit 52 rather a negative pressure
  • the air will flow from the supply conduit 60 to the outlet conduit 61.
  • the air flow from the supply conduit 60 of the corresponding fluidic element 6 will be deflected into outlet conduit 62.
  • FIG. 1 It should be apparent that a number of devices of the type shown in FIG. 1 could be arranged in parallel juxtaposed relationship to one another in order to be able to accommodate in staggered relationship closely adjacently situated warp threads K.
  • a warp thread monitoring apparatus for textile machines, especially looms comprising a plurality of thread monitoring lamellae through each of which there piercingly extends an associated warp thread to retain the corresponding lamella in a raised position and upon rupture of any one of the warp threads the associated lamella drops into a lowered position, channel means having an inlet side and an outlet side and disposed beneath said plurality of thread monitoring lamellae, means for causing an air current flow between said inlet side and outlet side of said channel means, pneumatic flow-sensing means operatively connected with said channel means and responsive to the air flow conditions prevailing at said channel means, and a trigger mechanism operated by said pneumatic flow-sensing means for indicating the presence of a defect condition at the textile machine, each said thread monitoring lamella dropping into said channel means upon rupture of its associated warp thread to thereby at least impede the flow of air through said channel means which is then monitored by said pneumatic flow sensing means.
  • a warp thread monitoring apparatus as defined in claim 1, wherein said means for causing an air current flow between said inlet side and outlet side of said channel means incorporates air infeed means extending substantially transverse to the direction of air flow through said channel means and embodying at least one pair of substantially aligned oppositely situated air flow apertures and an air flow passageway for deflecting the air flow emanating from said aligned air flow apertures when the plurality of lamellae are in their raised position and the air flow through said channel means is undisturbed, whereas upon rupture of the warp thread and corresponding dropping of the associated lamellae into the channel means the air flow through said air flow passageway is interrupted so that the air flow emanating from said aligned apertures tends to dam up, causing a build-up of pressure at one of said aligned apertures which is then sensed by said pneumatic flow-sensing means.
  • a warp thread monitoring apparatus for textile machines, especially looms comprising a plurality of thread monitoring lamellae through each of which there piercingly extends an associated warp thread to retain the corresponding lamella in a raised position and upon rupture of any one of the warp threads the associated lamella drops into a lowered position, channel means having an inlet side and an outlet side and disposed beneath said plurality of thread monitoring lamellae, means for causing an air current flow between said inlet side and outlet side of said channel means, pneumatic flow-sensing means operatively connected with said channel means and responsive to the air flow conditions prevailing at said channel means, and a trigger mechanism operated by said pneumatic flow-sensing means for indicating the presence of a defect condition at the textile machine, each said thread monitoring lamella dropping into said channel means upon rupture of its associated warp thread to thereby at least impede the flow of air through said channel means which is then monitored by said pneumatic flow-sensing means, said means for causing an air current flow between
  • said pneumatic flow-sensing means incorporates an air flow conduit arranged in front of each pair of aligned air flow apertures and a sensor outlet conduit communicating via a transverse conduit with said air supply conduit, each said air supply conduit possessing a nozzle-like constricted portion, said transverse conduit being arranged downstream of said nozzle-like constricted portion with respect to the direction of air flow, so that a negative pressure condition prevails in said transverse conduit during such time as the air flow through said channel means is not interrupted by virtue of rupture of a warp thread, whereas upon rupture of a warp thread an overpressure condition prevails at said transverse conduit.
  • said pneumatic flow-sensing means further includes a flow controlled-fluidic component for evaluating sensing the presence of an overpressure condition, said sensor outlet conduit serving as the control conduit for said fluidic component.
  • said channel means comprises a respective channel member associated with a given group of thread monitoring lamellae, each channel member having an inlet side and an outlet side for the flow of air
  • said air infeed means including a respective intermediate tubular member arranged between the outlet side of one channel member and the inlet side of the next successive channel member, each said intermediate tubular member being equipped with two compartments, one compartment defining said air flow passageway and serving to receive the outflow of air from an adjacent channel member arranged upstream therefrom with respect to the direction of flow of the air through said channel means, said intermediate tubular member being provided with said air flow apertures, said pneumatic flow-sensing means communicating with said one compartment, the other compartment being provided with an air discharge opening, said other compartment serving for the infeed of a supply of air via said air discharge opening into the associated channel member and in a direction towards the next successive intermediate tubular member arranged downstream in the direction of the air flow through said channel means, said other compartment further serving to supply air via the other of said air flow
  • a warp thread monitoring apparatus for textile equipment comprising a plurality of warp thread monitoring lamellae each of which is operably associated with a given warp thread and retained in a raised position when the warp thread associated therewith is intact and movable into a lowered position when the warp thread associated therewith is defective, an air flow channel means disposed beneath said plurality of warp thread monitoring lamellae, means for producing an air flow through said channel means, means for sensing the flow of air through said channel means and responsive to impedance of such air flow through said channel means when a given lamella drops into said channel means upon rupture of its associated warp thread.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US104554A 1970-02-27 1971-01-07 Pneumatic warp thread monitoring apparatus Expired - Lifetime US3670778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH289470A CH520218A (de) 1970-02-27 1970-02-27 Kettfaden-Überwachungseinrichtung

Publications (1)

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US3670778A true US3670778A (en) 1972-06-20

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US104554A Expired - Lifetime US3670778A (en) 1970-02-27 1971-01-07 Pneumatic warp thread monitoring apparatus

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US (1) US3670778A (ja)
JP (1) JPS4826824B1 (ja)
CA (1) CA929832A (ja)
CH (1) CH520218A (ja)
DE (1) DE2060908C3 (ja)
FR (1) FR2094910A5 (ja)
GB (1) GB1298312A (ja)
SE (1) SE368040B (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100139804A1 (en) * 2008-12-10 2010-06-10 Kabushiki Kaisha Toyota Jidoshokki Apparatus for detecting break in warp yarn in loom
CN102851853A (zh) * 2012-09-28 2013-01-02 吴江市隆泰喷织厂 喷水织机的断线捕捉装置
CN105568520A (zh) * 2016-01-15 2016-05-11 佛山慈慧通达科技有限公司 三维织机多层经线传输检测机构及其使用方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2050104A (en) * 1979-05-18 1980-12-31 Cons Group Screen-printing screen and methods of use and manufacture thereof
WO2018176386A1 (zh) * 2017-03-31 2018-10-04 深圳市红昌机电设备有限公司 立式绕线机的脚控制方法及系统

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1467135A (fr) * 1965-12-13 1967-01-27 Cotonniere De Fives Casse-chaîne électrique perfectionné pour métier à tisser
US3584358A (en) * 1970-01-28 1971-06-15 Eastman Kodak Co Pneumatic ends out detection apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1467135A (fr) * 1965-12-13 1967-01-27 Cotonniere De Fives Casse-chaîne électrique perfectionné pour métier à tisser
US3584358A (en) * 1970-01-28 1971-06-15 Eastman Kodak Co Pneumatic ends out detection apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100139804A1 (en) * 2008-12-10 2010-06-10 Kabushiki Kaisha Toyota Jidoshokki Apparatus for detecting break in warp yarn in loom
CN101787609B (zh) * 2008-12-10 2012-01-04 株式会社丰田自动织机 织机中检测经纱断头的设备
US8352063B2 (en) 2008-12-10 2013-01-08 Kabushiki Kaisha Toyota Jidoshokki Apparatus for detecting break in warp yarn in loom
CN102851853A (zh) * 2012-09-28 2013-01-02 吴江市隆泰喷织厂 喷水织机的断线捕捉装置
CN105568520A (zh) * 2016-01-15 2016-05-11 佛山慈慧通达科技有限公司 三维织机多层经线传输检测机构及其使用方法

Also Published As

Publication number Publication date
FR2094910A5 (ja) 1972-02-04
JPS4826824B1 (ja) 1973-08-16
DE2060908C3 (de) 1974-07-04
SE368040B (ja) 1974-06-17
CA929832A (en) 1973-07-10
DE2060908B2 (de) 1973-12-06
GB1298312A (en) 1972-11-29
DE2060908A1 (de) 1972-01-05
CH520218A (de) 1972-03-15

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