EP1223138B1 - Method and device for controlling the weft stock in weft suppliers for mechanical-pick looms, including means for notifying the color selection - Google Patents

Method and device for controlling the weft stock in weft suppliers for mechanical-pick looms, including means for notifying the color selection Download PDF

Info

Publication number
EP1223138B1
EP1223138B1 EP01205107A EP01205107A EP1223138B1 EP 1223138 B1 EP1223138 B1 EP 1223138B1 EP 01205107 A EP01205107 A EP 01205107A EP 01205107 A EP01205107 A EP 01205107A EP 1223138 B1 EP1223138 B1 EP 1223138B1
Authority
EP
European Patent Office
Prior art keywords
weft
usp
picking
color selection
loop
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
EP01205107A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1223138A3 (en
EP1223138A2 (en
Inventor
Luca Gotti
Pietro Zenoni
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.)
LGL Electronics SpA
Original Assignee
LGL Electronics SpA
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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1223138A2 publication Critical patent/EP1223138A2/en
Publication of EP1223138A3 publication Critical patent/EP1223138A3/en
Application granted granted Critical
Publication of EP1223138B1 publication Critical patent/EP1223138B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices

Definitions

  • This invention is concerned with an improved method and device for controlling the weft stock in weft suppliers of mechanical-picking looms, including means for real-time transmission of the color selection. More precisely, the invention relates to looms including a control unit and at least one connection line, serial or parallel, for the real-time transmission of a message concerning the color of the weft to be supplied to the loom during the current weft picking stroke and therefore the weft supplier to be selected.
  • a prior, particularly advantageous connection line to which the following description refers without limitation to the invention, is a line commonly known as CAN bus (Can Application Network), and found in most modern looms.
  • weft supplying devices arranged between the reel and the loom and performing the task of supplying the weft by releasing it, upon request from the loom, from a weft stock stored in form of loops wound on a drum, and also the task of restoring the loops that have been released by re-winding an equivalent amount of yarn in order to maintain the weft stock unchanged.
  • a supplier system for mechanical-pick looms of the kind specified above employs one or more weft supplying devices, for example as many as the colors of the wefts that are to be picked.
  • Each device comprises a stationary drum upon which a swivel arm, which is coupled to a motor-driven flywheel, winds yarn loops to build a weft stock.
  • the weft supplier device is also equipped with an electronic control system that, depending on signals emitted by corresponding sensors, counts the yarn loops being unwound from the drum upon request from the loom and upon drive by the motor driving the swivel arm, the latter thus re-winding an equal number of loops to restore the weft stock.
  • the control system processes the pulse signals generated by three sensors which respectively detect: a) each turn of the swivel arm, b) availability of weft stock on the supplier's drum and c) the passage of each loop as it unwinds from the supplier's drum.
  • a first sensor of the tern which detects each turn of the swivel arm, consists of a Hall sensor adapted to generate a pulsed signal at each passage of a permanent magnet attached to the flywheel of said arm.
  • a second sensor detects the presence of weft stock on the drum, and typically consists of an optomechanical system comprising a floating rod having one end touching the yarn wound on the drum and the other end arranged for intercepting a beam of light falling on a photoelectric cell, so that the latter is darkened depending on the presence of yarn on the drum.
  • a third sensor called for brevity loop-passage sensor, is, as a general rule, the most critical in respect of the correct operation of the above control system, and is manufactured in different forms depending on the different requirements. The different forms are generally not quite satisfactory from the point of view of their reliability.
  • the loop-passage sensor consists of a photoelectric cell, with an emitter sending a beam of light towards a reflecting surface, placed near the trailing portion of the supplier's drum, to be reflected towards the photosensitive receiver.
  • the passage of the unwinding weft loop by interrupting said beam of light, produces an pulsed change in the signal emitted by the photosensitive receiver, yielding a usable pulse signaling a passage of the loop.
  • said loop-passage sensor consists of a piezoelectric plate placed near the terminal yarn guide ring of the supplier. Such a plate is placed, with respect to said yarn guide, so that the weft yarn, when drawn by the loom, moderately interacts with the plate itself and produces, by hitting it, a change of the voltage across it.
  • the suitably amplified voltage change is a usable signal indicating a passage of the loop.
  • both said known loop-passage sensors have considerable disadvantages and limits of applicability.
  • known sensors of the first kind suffer form limits and operational inaccuracies if they are used in weaving processes employing dusty or lint-releasing wefts. Dust or lint, by accumulating at the zone where the light-reflecting surface is arranged, distorts or nullifies the action of the sensor.
  • Piezoelectric sensors of the second kind have a behaviour heavily dependent on the yarn count used in the weaving process, and it is therefore very difficult to choose an amplification of the signal generated by the sensor, which is satisfactory for both thin and thick wefts.
  • the invention has the main object of eliminating these and other disadvantages of the known systems. More particularly, the invention has the main important object of providing a system and a control device of the weft stock in weft supplying devices intended for mechanical-picking looms comprising means for notifying the color selection, whose operation is improved so that is is completely independent of the nature, functionality and reliability of said loop passage sensor.
  • this invention is based on the concept of eliminating the loop passage sensor and of replacing it with virtual signals generated by a logic block, driven by the color selection data sent by the loom's controller and transmitted to the block itself by said CAN bus; the selection data being used to start a processing procedure, residing in the logic block, causing the block to emit said virtual signals, each indicating the passage of a yarn loop.
  • the above processing procedure substantially comprises:
  • Fig. 1 shows a typical known supplier system SI for supplying a weft yarn F to a mechanical-picking loom TE, comprising at least one weft supplying device P, inserted between loom TE and reel RO, on which yarn F is wound.
  • supplier P comprises a stationary drum TA upon which a swivel arm BR, coupled to a flywheel VO and driven by a motor MO, winds a plurality of yarn loops to build a weft stock RT.
  • a controller RV arranged for controlling the entire system SI, generates three voltages appearing on respective outputs a, b, c of a power interface PD (driver), for the controlled supply of motor MO.
  • a a so-called loop-passage piezoelectric sensor S1 is placed at the exit of supplier P near a terminal yarn guide GT and sends pulse signals USP to notify controller RV of the loops being unwound from drum TA.
  • a further sensor S3, typically a Hall sensor, is placed in front of flywheel VO and sends controller RV a pulse signal at each revolution of arm BR as it winds a loop on drum TA.
  • Sensor S3 is sensitive to the passage of a magnet M carried by flywheel VO.
  • controller RV receives information on the number of loops unwound from drum TA, by means of signals USP and also receives information on the status of weft stock RT by means of signal PTR.
  • the controller starts motor MO in order to restore the loops withdrawn from the stock and, as each loop is rewound, it receives a corresponding signal WSP from sensor S3.
  • the system attempts to maintain the amount of loops of stock RT substantially unchanged, by matching the unwound loops with the rewound loops.
  • system SI' of Fig. 2 only operates with looms TE' including a local controlling unit LC (Loom Controller), as known per se, and at least one connection line, serial or parallel, suitable for the real-time transmission of a message concerning the color of the weft to be supplied to the loom during the current weft picking stroke.
  • LC Local controlling unit
  • Such a line is of a type commonly known as CAN bus (Can Application Network) and connects local controller LC, by means of a line controller CC, to a logic block SUV which is able to generate virtual pulsed signals USP' indicating the unwinding of loops from drum TA.
  • logic block SUV activated by the color selection data sent by loom controller LC and transmitted to the block by said Can bus CB, starts a processing procedure in which the temporal correlation between the computed variables is shown in diagram of Fig. 3.
  • logic block SUV also processes a time variable CT expressed in terms of weft consumption over time and, by resetting such variable to zero at time t0, i.e., to initial conditions (system start), computes an operative procedure consisting of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP01205107A 2001-01-12 2001-12-28 Method and device for controlling the weft stock in weft suppliers for mechanical-pick looms, including means for notifying the color selection Expired - Lifetime EP1223138B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001TO000013A ITTO20010013A1 (it) 2001-01-12 2001-01-12 Metodo e dispositivo per il controllo della riserva di trama negli alimentatori di trama a telai di tessitura ad inserzione meccanica includ
ITTO010013 2001-01-12

Publications (3)

Publication Number Publication Date
EP1223138A2 EP1223138A2 (en) 2002-07-17
EP1223138A3 EP1223138A3 (en) 2003-10-22
EP1223138B1 true EP1223138B1 (en) 2006-05-03

Family

ID=11458362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01205107A Expired - Lifetime EP1223138B1 (en) 2001-01-12 2001-12-28 Method and device for controlling the weft stock in weft suppliers for mechanical-pick looms, including means for notifying the color selection

Country Status (4)

Country Link
EP (1) EP1223138B1 (it)
CN (1) CN100432312C (it)
DE (1) DE60119274T2 (it)
IT (1) ITTO20010013A1 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1961686B1 (en) * 2007-02-20 2016-09-14 Iro Ab Yarn tension monitoring and setting system
ITMI20100390U1 (it) * 2010-12-23 2011-03-24 Roj Srl Gruppo di sensori ottici a rilessione in un porgitrama per telai tessili.
EP2907906B1 (en) 2014-02-13 2016-05-25 L.G.L. Electronics S.p.A. A stock-controlling method for a storage yarn feeder with rotary drum

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2069184B (en) * 1980-01-30 1983-09-28 Leesona Corp Strand feeding system
FR2548693B1 (fr) * 1983-07-07 1985-10-18 Saurer Diederichs Sa Dispositif d'entrainement en rotation pour predelivreur-mesureur de trame, sur une machine a tisser sans navette
IT1215235B (it) * 1985-01-30 1990-01-31 Omv Off Mecc Vilminore Dell'alimentazione di filati di dispositivo di autoregolazione trama in telai di tessitura ad aria.
EP0286590B1 (de) * 1987-04-08 1991-05-08 GebràœDer Sulzer Aktiengesellschaft Schussfadenspeicher für eine Webmaschine
IT1234790B (it) * 1989-06-06 1992-05-27 Lgl Electronics Spa Dispositivo di conteggio delle spire svolgentisi dagli apparecchi alimentatori di trama per telai di tessitura, a scopo di regolazione della velocita' di detti apparecchi

Also Published As

Publication number Publication date
DE60119274D1 (de) 2006-06-08
EP1223138A3 (en) 2003-10-22
ITTO20010013A1 (it) 2002-07-12
CN100432312C (zh) 2008-11-12
EP1223138A2 (en) 2002-07-17
DE60119274T2 (de) 2007-04-05
ITTO20010013A0 (it) 2001-01-12
CN1375585A (zh) 2002-10-23

Similar Documents

Publication Publication Date Title
JP3000389B2 (ja) ヤーンフィーダ制御装置
WO1984001394A1 (en) Yarn storing, feeding and measuring device
EP2270269B1 (en) Method for detecting the stop of the yarn unwinding from a yarn feeder provided with a stationary drum
CN102373574A (zh) 用于检测编织线上纱线意外停止的方法与装置
JPH01292143A (ja) 繊維機械用ヤーンフィーダ及びその製御方法
US5018465A (en) Sewing machine with thread monitor
EP1223138B1 (en) Method and device for controlling the weft stock in weft suppliers for mechanical-pick looms, including means for notifying the color selection
JP2002535508A (ja) 挿入制動装置を有する織機
EP0128928B1 (en) Weft yarn storing, feeding and measuring device for jet weaving machines
US4556088A (en) Control arrangement for weaving loom or the like
US4627474A (en) Yarn storing, feeding and measuring device
WO2000056964A3 (de) Verfahren zum optimieren und überwachen des schusseintrages auf webmaschinen
EP1335054B1 (en) Method and device for measuring weft thread, particularly in electronic circular knitting machines
EP0325793B1 (en) Weft-feeler with automatic adjustment of the delay time, for weft feeders of shuttleless looms
EP0247225B1 (en) Device for surveying the insertion of a weft yarn
EP1382727B1 (en) Apparatus for preventing accidental operation of loom
CN1191000A (zh) 扫描纱线的方法和纱线退绕传感器
JP2005514533A (ja) 糸処理システムを制御および／またはモニターする装置ならびに方法
EP1050610B1 (en) Method and device for controlling weft winding arm rotating signals in weft feeders for weaving looms
JP3808437B2 (ja) よこ糸モニタ装置
EP1233090B1 (en) Method for monitoring the operation in an insertion brake
US6286561B1 (en) Method and apparatus for monitoring the removal of a catch selvage from a loom
EP3269857A1 (en) Method for controlling the unwinding of yarn from a weft feeder
US6164340A (en) Method and apparatus for temporarily activating a brake in a weaving loom
CN1329576C (zh) 织机

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17P Request for examination filed

Effective date: 20031106

AKX Designation fees paid

Designated state(s): BE CH DE LI SE

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE LI SE

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: PA ALDO ROEMPLER

REF Corresponds to:

Ref document number: 60119274

Country of ref document: DE

Date of ref document: 20060608

Kind code of ref document: P

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20070206

REG Reference to a national code

Ref country code: CH

Ref legal event code: PCAR

Free format text: ALDO ROEMPLER PATENTANWALT;BRENDENWEG 11 POSTFACH 154;9424 RHEINECK (CH)

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20090324

Year of fee payment: 8

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091231

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091231

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20181214

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20191128

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20191128

Year of fee payment: 19

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191229

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60119274

Country of ref document: DE

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20201231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201231