EP1801273B1 - Weft stock detector for weft feeders - Google Patents

Weft stock detector for weft feeders Download PDF

Info

Publication number
EP1801273B1
EP1801273B1 EP20060021600 EP06021600A EP1801273B1 EP 1801273 B1 EP1801273 B1 EP 1801273B1 EP 20060021600 EP20060021600 EP 20060021600 EP 06021600 A EP06021600 A EP 06021600A EP 1801273 B1 EP1801273 B1 EP 1801273B1
Authority
EP
European Patent Office
Prior art keywords
weft
drum
feeler
slot
stock detector
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.)
Not-in-force
Application number
EP20060021600
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1801273A2 (en
EP1801273A3 (en
Inventor
Pietro Zenoni
Rosario Castelli
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 EP1801273A2 publication Critical patent/EP1801273A2/en
Publication of EP1801273A3 publication Critical patent/EP1801273A3/en
Application granted granted Critical
Publication of EP1801273B1 publication Critical patent/EP1801273B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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

Definitions

  • the present invention relates to an improved weft stock detector for weft feeders.
  • the weft feeders for textile machines comprise a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft stock.
  • the loops are unwound from the drum, pass through a yarn guide eyelet and then and are fed to the loom.
  • a weft stock detector which generally includes two swinging feeler arms which are arranged at the opposite ends of the drum and are biased against the drum, e.g., by springs and/or by gravity, and a third swinging feeler arm arranged at a middle position, which has the aim of detecting any breaking of the yarn.
  • the feeler arms each can swing between a resting position lowered towards the drum and an active, lifted position, in relation to the presence/absence of loops on the drum in the area engaged by the arm.
  • Photoelectric cells detect the movements of the feeler arms and are connected to send signals to a control unit which, on the basis of the received signals, pilots the rotation of the swivel arm in order to maintain the weft stock substantially constant on the drum, within the limits defined by the positions of the two outermost feeler arms.
  • WO 99/30999 discloses a weft stock detector according to the preamble of claim 1.
  • the detectors of the above type have the drawback that they are often inaccurate with thin yarns, because in this case the movement of the arms from the active position to the resting position, and vice versa, is very slight so that the photoelectric-cells are not capable of detecting it. Accordingly, these detection failures affect the reliability of the weft stock detector.
  • a weft feeder 10 for textile machines comprises a stationary drum 12 having longitudinal grooves 13 on its surface, on which a swivel arm 14, which is driven by a motor 15 piloted by a control unit CU (only diagrammatically shown in Fig. 3 ), winds a plurality of yarn loops forming a weft reserve or stock RT.
  • yarn F is unwound from the drum, passes through a yarn-guide eyelet 16 supported at the free end of a stationary arm 17 projecting from the motor housing parallel to the axis of the drum, and then is fed to the loom.
  • Stationary arm 17 also supports a weft stock detector 18 for controlling the weft reserve on the drum.
  • weft stock detector 18 comprises a housing 20 supporting three feeler arms 22, 24, 26 hinged to respective pins 28, 30, 32 parallel to one another. Two of these feeler arms 22, 26 are arranged near the opposite ends of the drum, while the third feeler arm 24 is arranged at a middle position.
  • the arms each comprise a U-shaped metal rod 34 ( Fig. 2 ) whose free ends are attached to an anchor body 36 integral with a bush 38 that is hinged to a respective one of the pins 32.
  • the curved end 34a of the U is slanting at an angle with respect to the two parallel branches in the running direction of the yarn, and is biased against drum 12 by magnetic action of mutual repulsion between a first permanent magnet 39a incorporated in a projection 40 projecting from bush 38 on the opposite side of the pin, and a second stationary magnet 39b having the same polarity, which is supported in front of first magnet 39a.
  • the feeler arms each can swing between a lowered resting position, when there are no yarn loops wound on the drum in the area engaged by the arm, and a lifted active position, when there are yarn loops. In the resting position ( Fig.
  • the curved end or contact end 34a of the feeler arm is received in one of the longitudinal grooves 13 on the drum, while the free end 40a of projection 40 is abutted against an abutment 41 integral with housing 20.
  • the yarn loops wound on drum 12 in the area below the feeler arm cause the arm to lift from its resting position.
  • a photoelectric cell 42 is attached to housing 20 above bush 38 for detecting the movements of the feeler arm.
  • Photoelectric cell 42 is shaped as an upside down U, with two opposite longitudinal walls 44, 46 ( Fig. 6 ) which respectively house an emitting diode 47 connected to a power supply AL (which is only diagrammatically shown in Fig. 6 ) and generating a stream of photons through a narrow rectilinear vertical slot 48 ( Figs. 4, 7 ), and a photodiode 50 arranged in front of slot 48 and connected to control unit CU.
  • a gap is defined between the walls, in which a thin protrusion 52 is insertable which is frontally formed on projection 40 and is delimited by a rectilinear edge 54 extending radially from bush 38 in a position such that it is aligned to the outer vertical edge (i.e., the right edge in the Figures) of slot 48 when the feeler arm is at rest ( Fig. 7 ). Therefore, thin protrusion 52 defines a shield that obscures slot 48 and breaks off the stream of photons when the feeler arm is at rest.
  • Photoelectric cell 42 is connected to send position signals to control unit CU, which is programmed to pilot the rotation of swivel arm 14 on the basis of the received signals, in such a way as to maintain the weft stock RT substantially constant within the limits defined by the positions of the two outermost feeler arms 22, 26.
  • the intermediate feeler arm 24 has the aim of detecting any breaking of the yarn.
  • the programming of control unit CU is not within the scope of the present invention because it belongs to the normal knowledge of the person skilled in the art, and therefore no further description will be given about it.
  • Photoelectric cell 46 is anchored to the upper side of housing 20 by means of a U-shaped anchor member 56 which also defines the above-cited abutment 41 against which the free end 40a of projection 40 abuts when the feeler arm is in its resting position.
  • a magnetic sensor 58 is mounted on housing 20 and is arranged in such a way as to detect the movements of first magnet 39a mounted on the feeler arm.
  • Magnetic sensor 46 is also connected to send position signals to control unit CU and can be adjusted to cooperate with the photoelectric cell, e.g., for giving two subsequent position signals in relation to the position of the feeler arm, or for performing other combined or alternate detections, such as can be easily contrived by the person skilled in the art.
  • feeler arms 22, 24, 26 are biased against drum 12 by gravity and by mutual repulsion between the magnets 39a, 39b, with a lever-type action about the fulcrum defined by the axes of the pins, and can swing between the lowered resting position and the lifted active position in relation to the absence/presence of loops on the drum.
  • Figs. 4, 5 show the weft stock detector in association with a thin yarn FS, in an active position and in a resting position respectively. As shown in Fig.
  • the feeler arm makes a very slight movement from its resting position, such as the movement determined by a loop of a very thin yarn, to cause protrusion 52 to immediately and completely uncover slot 48.
  • this circumstance makes the weft stock detector much more sensitive and reactive in detecting very slight movements of the feeler arms, even in case of very thin yarns.
  • feeler arm could be biased against the drum by biasing means other than the magnets, e.g., by spring, or only by gravity.
  • biasing means other than the magnets, e.g., by spring, or only by gravity.
  • sensor magnet 58 should be intended as useful but not indispensable to carry out the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20060021600 2005-12-22 2006-10-16 Weft stock detector for weft feeders Not-in-force EP1801273B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20050893 ITTO20050893A1 (it) 2005-12-22 2005-12-22 Rilevatore di scorta trama perfezionato per dispositivi alimentari di trama

Publications (3)

Publication Number Publication Date
EP1801273A2 EP1801273A2 (en) 2007-06-27
EP1801273A3 EP1801273A3 (en) 2009-04-29
EP1801273B1 true EP1801273B1 (en) 2010-07-07

Family

ID=37865736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060021600 Not-in-force EP1801273B1 (en) 2005-12-22 2006-10-16 Weft stock detector for weft feeders

Country Status (4)

Country Link
EP (1) EP1801273B1 (it)
CN (1) CN1986929B (it)
DE (1) DE602006015277D1 (it)
IT (1) ITTO20050893A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20111217A1 (it) * 2011-12-28 2013-06-29 Lgl Electronics Spa Dispositivo frena-trama per alimentatori di filato a tamburo fisso

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19756243A1 (de) * 1997-12-17 1999-06-24 Iro Ab Fadenliefergerät
ITTO980520A1 (it) * 1998-06-16 1999-12-16 Lgl Electronics Spa Perfezionamento ai dispositivi di sorveglianza della riserva di filato negli apparecchi alimentatori di trama a telai di tessitura.

Also Published As

Publication number Publication date
DE602006015277D1 (de) 2010-08-19
ITTO20050893A1 (it) 2007-06-23
CN1986929B (zh) 2011-05-25
EP1801273A2 (en) 2007-06-27
CN1986929A (zh) 2007-06-27
EP1801273A3 (en) 2009-04-29

Similar Documents

Publication Publication Date Title
KR100388371B1 (ko) 씨실모니터용장치를갖는원형직기
KR0127874B1 (ko) 텍스타일기의 얀 공급기 및 이의 모터 속도 조정 방법
EP2907908B1 (en) Yarn-unwinding sensor for storage yarn feeders with rotary drum
EP1801273B1 (en) Weft stock detector for weft feeders
ES2282343T3 (es) Dispositivo para la deteccion de roturas de hilo de gasa de vuelta en maquinas de tejer o maquina de tejer, en particular con marcos de lizoy un dispositivo para la deteccion de roturas de hilo.
EP1788129B1 (en) Weft stock detector for weft feeders
US11401635B2 (en) Device and a method for sensing breakage or end of warp yarn for a fabric weaving loom
CN108193376B (zh) 横机及其探针感应器
EP0255182B1 (en) System of detection of shed closed to shuttle passage in multished looms
US4472932A (en) Thread guard for spinning or twisting machine
EP0602460B1 (en) Strand breakage detection system
EP1357214A2 (en) Selvage warp yarn break detection system
US20040016472A1 (en) Weft thread monitoring device
US4158372A (en) Process and device for watching the weft on weaving looms
CN213708649U (zh) 一种塑料圆织机停经、断经、完经自动停机装置
CN214422819U (zh) 一种经断或经完自动停机的圆织机
US5940945A (en) Shed insertible sensor for dividing-shed formation on a sectional warping machine
CS199731B2 (en) Shuttleless weaving looms
CN202968916U (zh) 断纬自停装置
KR19980056187U (ko) 레이져를 이용한 직기용 경사 탐지장치
US749364A (en) Waskin
Kabir Exploration of the advancement in warp & weft stop motion: Primitive to electronic system
KR200324110Y1 (ko) 전자식 터반 직물용 송출장치
US691456A (en) Filling-replenishing loom.
CN112796025A (zh) 一种平衡经丝张力的自动停机装置及圆织机

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 BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

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 BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

17P Request for examination filed

Effective date: 20090530

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

REF Corresponds to:

Ref document number: 602006015277

Country of ref document: DE

Date of ref document: 20100819

Kind code of ref document: P

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

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

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

26N No opposition filed

Effective date: 20110408

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602006015277

Country of ref document: DE

Effective date: 20110408

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: 20101031

Ref country code: CH

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

Effective date: 20101031

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

Ref country code: NL

Payment date: 20181213

Year of fee payment: 14

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: 20191017

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

Ref country code: DE

Payment date: 20211026

Year of fee payment: 16

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

Ref country code: BE

Payment date: 20221005

Year of fee payment: 17

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602006015277

Country of ref document: DE

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: 20230503

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20231031

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: 20231031