EP0670384A1 - Détection des pertes de fil sur métier à tisser à projectiles - Google Patents

Détection des pertes de fil sur métier à tisser à projectiles Download PDF

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Publication number
EP0670384A1
EP0670384A1 EP95810081A EP95810081A EP0670384A1 EP 0670384 A1 EP0670384 A1 EP 0670384A1 EP 95810081 A EP95810081 A EP 95810081A EP 95810081 A EP95810081 A EP 95810081A EP 0670384 A1 EP0670384 A1 EP 0670384A1
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EP
European Patent Office
Prior art keywords
thread
weft
clamp
edge
clamp body
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.)
Ceased
Application number
EP95810081A
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German (de)
English (en)
Inventor
Ulrich Sigrist
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0670384A1 publication Critical patent/EP0670384A1/fr
Ceased legal-status Critical Current

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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
    • D03D51/34—Weft stop motions
    • 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
    • D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
    • D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle

Definitions

  • the invention relates to a method and an apparatus for the detection of thread losers in the weft and catch mechanism of a projectile weaving machine, in which a tensioned weft thread is taken over and clamped by edge thread clamps which can be pivoted on a movable rod, separated from a pair of scissors in the weft mechanism with a free end free thread ends are inserted into the fabric edges with selvage needles and the edge thread clamps are opened.
  • the invention further relates to an application of the method.
  • a rapier projectile enters the weft thread into a shed.
  • the energy required to fire the projectile is stored by turning a torsion bar. After releasing a lock, the torsion bar snaps back into its original position and accelerates the projectile smoothly using a lever.
  • the projectile slides through a rake-shaped guide.
  • a transport device arranged under the shed brings the projectile braked in the catching mechanism back into the firing position in the shooting mechanism.
  • a projectile weaving machine can process all kinds of thread-like yarns, for example spun yarns made of natural, chemical and mixed fibers, endless yarns made of cellulose and synthetic materials, smooth and textured, fancy yarns and threads as well as glass fiber yarns, but also narrow ribbons and metal threads.
  • thread especially weft thread.
  • Fig. 1 shows the known entry principle on a partial indicated projectile weaving machine 10 by Sulzer Hinti. All parts which are not essential for the description of the present invention and are known to the person skilled in the art are omitted for the sake of simplicity.
  • a weft thread 14 is unwound from a thread bobbin 12 and is held in the weft mechanism 16 (not shown in more detail).
  • the weft thread 14 first passes through a thread brake 22, then a probe 24, which controls whether the thread is pulled and is therefore also called thread guide.
  • the catch mechanism 26 which, among other things, brakes the projectile 28, which is shown in a greatly enlarged manner, and leads it back to the weft mechanism 16.
  • the projectile 28, which is brought to a standstill and pushed back by a projectile catching brake, not shown, with a projectile clip 30 for the weft thread 14 has a distance a of about 15 to 20 mm from the edge thread clamp 32 of the catching mechanism 26.
  • a projectile clip 30 for the weft thread 14 Arranged in the weft mechanism 16 is a mirror-image-shaped edge thread clamp 34, likewise on a displaceable, not visible linkage, which travels about 30 to 40 mm back and forth in the direction perpendicular to the plane of the drawing per work cycle.
  • the distance b of the edge thread clamps 32, 34 from the reed 36 is very small, it is approximately 1 mm.
  • the edge thread clamps 32, 34 have the task of taking over and holding the weft thread 14 after the projectile 28 has been braked and positioned until the free thread ends, which in practice are approximately 15 mm long, pass through the selvage needles 42, 44 into the fabric edges 46, 48 which last procedural step is also referred to as depraved.
  • the weft thread 14 is no longer stretched for the time being, it is tensed by a retraction phase. If an edge thread clamp 32 loses the weft thread 14, it springs back and cannot be inserted into the fabric edge 46 by the selvage needle 42. There is a particular risk of thread loosening with thin weft threads. This thread loser results in a reduction in the quality of the fabric.
  • the inventor has set himself the task of creating a method and a device of the type mentioned at the outset with which the non-detection or the loss of the weft thread by the edge thread clamps can be systematically and quickly reliably and reliably detected by automatic detection and the necessary follow-up actions triggered.
  • the object is achieved according to the invention in that a direct check is carried out to determine whether the weft thread lies between the clamp body and the tensionable clamp foot of the edge thread clamps, by a direct contact of the contact surfaces of the clamp body with the contact surfaces of the clamp foot during a fixed time interval electrical signal is generated and evaluated.
  • photocells on the clamp body and on the shaft for the clamp foot can be used to check whether the contact surfaces of the clamp body and the clamp foot are closed at a distance corresponding to the thread thickness or directly, without an intermediate thread.
  • the signals generated are generally relatively weak, they are expediently amplified in the area of the edge thread clamp and passed on to a processor.
  • the edge thread clamps move back and forth at a high frequency of about 30 to 40 mm in one work cycle.
  • the signal is therefore transmitted not only by cable, but also optically, especially in the infrared range, or inductively.
  • the electrical signals are only generated and evaluated during a defined time interval.
  • the time interval also called the time window, is triggered by a precisely defined movement sequence of the projectile weaving machine or by a flight trigger, which detects the projectile flying by.
  • a minimum threshold value, which must be exceeded for evaluation, is preferably established for the electrical signal.
  • This threshold value is, for example, 50% of the measurement signal determined. All underlying electrical signals are filtered out as interference signals. For example, according to the piezoelectric method, an electrical signal is produced even with the thread lying between the clamp body and the clamp foot, which, however, due to the damped impact, does not reach the threshold value and is filtered out.
  • the object is achieved according to the invention in that a residual thread monitor is arranged in or on the edge thread clamps.
  • the remaining thread monitor is connected to the evaluation circuit, for example a microprocessor, via electrical connection cables, also to an inductive or optical intermediate stage with converters known per se.
  • the evaluation circuit for example a microprocessor, via electrical connection cables, also to an inductive or optical intermediate stage with converters known per se.
  • the remaining thread monitor is expediently installed in a recess in the terminal body, depending on the measuring method used, preferably adjacent to the contact surface to the terminal foot.
  • shocks can be absorbed practically undamped.
  • the residual thread monitor can also be applied to the clamp body with a clamping bracket or another holding device or fixed to it with a housing or carrier. Because of the narrow space in the area of the edge thread clamps, the remaining thread monitor is preferably attached to the narrow side of the clamp body, as already mentioned by clamping or flanging, but also by inserting it.
  • the edge thread monitor is preferably a shock sensor, in particular with a piezo oxide, a potentiometric measuring cell, an electrical micro-contact between the contact surfaces of the terminal body and the terminal foot, a pair of photocells or an inductive displacement sensor, all elements known per se.
  • the method according to the invention is used for switching off a projectile weaving machine and / or signaling a weft error when the weft thread is missed or lost due to the edge thread clamp. This ensures for the first time that it can be determined with certainty whether the edge thread clamp has missed or lost the weft thread. Weaving errors that have so far often remained undetected or discovered too late can thus be immediately detected and eliminated.
  • the edge thread clamp 32, 34 shown in FIGS. 2 and 3 has an essentially C-shaped clamp body 50 with a contact surface 52 in the direction of a clamp foot 54 with a corresponding contact surface 56.
  • Two spring bolts 58, 60 are guided in the clamp body 50.
  • the longer spring bolt 58 is rigidly connected to the clamp foot 54.
  • the force of the spring 62 guided by the spring pin 58 can be adjusted with an adjustable bracket 64 with a locking screw 66.
  • the shorter spring pin 60 is freely guided through the opening of a driver 68.
  • An auxiliary spring 70 guided by the shorter spring bolt 60 strikes the catch 68 with its locking ring 72.
  • a front opening roller 74 fastened to the machine frame lies on the two spring bolts 58, 60, presses them down and opens the contact surfaces 52, 56 for taking over the weft thread 14.
  • the edge thread clamps 32, 34 arranged on a rod have initially been moved in the direction of arrow 76.
  • the shorter spring pin 60, then the longer spring pin 58 for the clamp foot 54 has been pressed down.
  • the axis A of the front opening roller 74 lies vertically above the longer spring bolt 58, the clamp foot 54 is opened to the maximum and the weft thread 14 shifts in the direction of the longer spring bolt 58.
  • the edge thread clamps 32, 34 move back in the direction of the arrow 78 .
  • the weft thread 14 is suddenly clamped, cut off by scissors (not shown), and the edge thread clamps 32, 34 are displaced approximately 30 to 40 mm in the direction of arrow 78.
  • a rear opening roller (not shown) which is adjustably fastened to the machine frame and which in turn presses the spring bolts 58, 60 downward and releases the weft thread 14 previously folded over into a fabric edge (46, 48 in FIG. 1).
  • the time during which the weft thread 14 is to be clamped can be adjusted by shifting.
  • the clamp body 50 has an inserted hard metal plate 80 in the area of the contact surface 52. This ensures a wear-resistant contact surface 52.
  • a shock sensor 82 with electrical conductors, not shown, is inserted against the hard metal plate 80.
  • the edge thread clamps 32, 34 are moved away in the direction of the arrow 78, the contact surfaces 52, 56 hit the weft thread 14, the shock sensor 82 generates a small signal which is filtered out. If the weft thread 14 is missing in the case of a thread loser, the contact surfaces 52, 56 hit each other so hard that the shock sensor 82 generates a signal lying above the response threshold.
  • a photocell 84 is arranged, which emits a signal when the contact surfaces 52, 56 lie on one another.
  • these photocells 84 are only arranged if the shock sensor 82 is missing.
  • a conventional edge thread clamp 32, 34 has been retrofitted with a shock sensor 86, which, with a pressure plate (94 in FIG. 4) resting on the clamp body 50, is held by a clamp 88.
  • the shock sensor 86 corresponds functionally to the shock sensor 82, it reacts to the direct collision of the contact surfaces 52, 56 and generates an electrical signal.
  • the shock sensor 86 lies on the narrow side 92 of the clamp body 50, which is necessary in view of the limited space in the weft 16 and catch mechanism 26.
  • edge thread clamps 32, 34 are held on the displaceable linkage via a pivot axis 90 and are positioned with a spring, also not shown.
  • a shock sensor 86 shown in FIG. 4 and held by a clamping bracket 88, is designed as a piezo oxide with two brass pressure plates 94, 96.
  • the one pressure plate 94 lies on the outer narrow side 92 of the clamp body 50.
  • the pressure plate 94 like the other pressure plate 96, is connected to an electrical conductor 98.
  • the pressure-active plate 100 in between, in the present case a quartz plate made of hexagonal crystals, generates an electrical signal when the pressure is generated by vibration, which is led via the soldered brass plates 92, 96 to a microprocessor after any amplification.
  • a filling compound 104 is arranged, which consists for example of solder, plastic or the material of the plates 94, 96, brass.
  • the arrangement of this mass 104 is essential because it can generate stronger electrical signals.
  • the shock sensor 82 according to FIG. 2 contains only the two pressure plates 94, 96 and the pressure-active plate 100 according to FIG. 4.
  • a filling compound 104 is not absolutely necessary here because the vibrations that occur when the adjacent contact surfaces 52, 56 strike one another practically are undamped.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP95810081A 1994-02-18 1995-02-07 Détection des pertes de fil sur métier à tisser à projectiles Ceased EP0670384A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH48394A CH688049A5 (de) 1994-02-18 1994-02-18 Detektion von Fadenverlierern einer Projektilwebmaschine.
CH483/94 1994-02-18

Publications (1)

Publication Number Publication Date
EP0670384A1 true EP0670384A1 (fr) 1995-09-06

Family

ID=4188041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810081A Ceased EP0670384A1 (fr) 1994-02-18 1995-02-07 Détection des pertes de fil sur métier à tisser à projectiles

Country Status (2)

Country Link
EP (1) EP0670384A1 (fr)
CH (1) CH688049A5 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020058276A1 (fr) 2018-09-20 2020-03-26 Sanitea S.R.L. Kit de montage d'appareils sanitaires au sol, système comprenant ledit kit et procédé associé
CN111286846A (zh) * 2020-04-15 2020-06-16 扬州市郭氏精密机械制造有限公司 一种织布用纱夹

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB639856A (en) * 1946-06-07 1950-07-05 Sulzer Ag Improvements relating to weaving looms
DE1022975B (de) * 1955-12-29 1958-01-16 Sulzer Ag Vorrichtung zum UEberwachen des Schussfadens bei Webmaschinen mit Entnahme des Schussfadens von feststehenden Spulen
CH460664A (de) * 1967-09-22 1968-07-31 Rueti Ag Maschf Anordnung zur optischen Überwachung von Schussfäden an einer Webmaschine
FR2202965A1 (fr) * 1972-10-12 1974-05-10 Fabre Aime
DE2712698A1 (de) * 1976-03-29 1977-10-13 Picanol Nv Verfahren und vorrichtung fuer einschusskontrolle bei webmaschinen
AT377795B (de) * 1982-12-16 1985-04-25 Saurer Ag Adolph Schussfaden-ueberwachungseinrichtung an einer webmaschine
JPH05302244A (ja) * 1992-04-20 1993-11-16 Tsudakoma Corp 織機の緯糸検知装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB639856A (en) * 1946-06-07 1950-07-05 Sulzer Ag Improvements relating to weaving looms
DE1022975B (de) * 1955-12-29 1958-01-16 Sulzer Ag Vorrichtung zum UEberwachen des Schussfadens bei Webmaschinen mit Entnahme des Schussfadens von feststehenden Spulen
CH460664A (de) * 1967-09-22 1968-07-31 Rueti Ag Maschf Anordnung zur optischen Überwachung von Schussfäden an einer Webmaschine
FR2202965A1 (fr) * 1972-10-12 1974-05-10 Fabre Aime
DE2712698A1 (de) * 1976-03-29 1977-10-13 Picanol Nv Verfahren und vorrichtung fuer einschusskontrolle bei webmaschinen
AT377795B (de) * 1982-12-16 1985-04-25 Saurer Ag Adolph Schussfaden-ueberwachungseinrichtung an einer webmaschine
JPH05302244A (ja) * 1992-04-20 1993-11-16 Tsudakoma Corp 織機の緯糸検知装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 9350, Derwent World Patents Index; AN 93-400676 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020058276A1 (fr) 2018-09-20 2020-03-26 Sanitea S.R.L. Kit de montage d'appareils sanitaires au sol, système comprenant ledit kit et procédé associé
CN111286846A (zh) * 2020-04-15 2020-06-16 扬州市郭氏精密机械制造有限公司 一种织布用纱夹

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Publication number Publication date
CH688049A5 (de) 1997-04-30

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