[go: up one dir, main page]

EP2067728A1 - Capteur de tension de fil pour dispositifs d'alimentation en fil - Google Patents

Capteur de tension de fil pour dispositifs d'alimentation en fil Download PDF

Info

Publication number
EP2067728A1
EP2067728A1 EP07425767A EP07425767A EP2067728A1 EP 2067728 A1 EP2067728 A1 EP 2067728A1 EP 07425767 A EP07425767 A EP 07425767A EP 07425767 A EP07425767 A EP 07425767A EP 2067728 A1 EP2067728 A1 EP 2067728A1
Authority
EP
European Patent Office
Prior art keywords
yarn
mounting portion
support
tension sensor
plate
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Withdrawn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
EP07425767A
Other languages
German (de)
English (en)
Inventor
Giovanni Pedrini
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39327068&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2067728(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Priority to EP07425767A priority Critical patent/EP2067728A1/fr
Priority to DE200860001545 priority patent/DE602008001545D1/de
Priority to EP20080011753 priority patent/EP2067729B1/fr
Publication of EP2067728A1 publication Critical patent/EP2067728A1/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
    • B65H59/40—Applications of tension indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a yarn tension sensor for yarn-feeding devices.
  • yarn-feeding devices are used which draw the yarn from a reel and feed it to a textile machine in a controlled way.
  • so-called "negative" yarn feeders which generally comprise a stationary drum on which a motorized swivel arm winds a plurality of yarn loops forming a weft reserve.
  • the loops are unwound from the drum and are fed to the textile machine via a braking device which is controlled on the basis of a signal received from a tension sensor arranged downstream of the feeder, in such a way as to maintain the yarn tension substantially constant at a desired level.
  • So-called "positive" yarn feeders are also known, which generally comprise a rotating weft-winding drum which draws the yarn from a reel and feed it to the textile machine.
  • it is also known, e.g. from US 4,752,044 and US 4,953,367 , to control the tension of the yarn delivered by the feeder in such a way as to maintain it substantially constant at a desired level, by varying the speed of rotation of the drum on the basis of a signal received from a tension sensor.
  • WO 99/59909 describes a tension sensor suitable for applications with both negative and positive yarn feeders.
  • the sensor comprises a plate made of a ceramic material and provided with a flexible projection which is arranged to contact the yarn and to slightly deviate its path, thereby being subjected to the transverse component of the yarn tension.
  • the plate incorporates resistors disposed with the so-called "thick film” technology, which are connected to one another to form a Wheatstone bridge. Some of these resistors are disposed on the flexible projection of the plate, so that their resistance changes as a function of the bending of the projection and also the bridge generates an output signal which changes as a function of the bending of the projection and, consequently, of the yarn tension.
  • the plate is fastened to a support anchorable to the feeder, and to this purpose it is clamped between the support and a bracket by a pair of screws.
  • Such fastening method has the advantage that it does not require to change the shape of the plate, which is cut by laser into a standard profile that is accurately defined in order to optimize the response accuracy of the sensor, as well known to the person skilled in the art.
  • it also has drawbacks, because the variations in the ambient temperature, as well as the heating due to the operation of the feeder, cause the bracket to bend in a very different way with respect to the plate. The bending of the bracket generates tensions on the flexible projection, which consequently changes its liability to bend, thereby affecting the signal generated by the sensor.
  • a general, negative yarn feeder 10 which comprises a stationary drum 12 on which a flywheel 14 driven by a motor 14 winds a plurality of loops of yarn F forming a weft reserve.
  • the loops are unwound from the drum 12 and are fed to the textile machine.
  • the yarn delivered by feeder 10 is clamped between the delivery edge of drum 12 and a hollow, frustoconical braking member 20 controlled by position on the basis of a signal received by a generl yarn tension sensor TS, in such a way as to maintain the yarn tension substantially constant at a desired level.
  • Sensor TS is mounted on a stationary arm 22 and contacts the yarn delivered by the feeder in such a way as to slightly deviate its path, whereby it is subjected to the transverse component of the yarn tension.
  • a general positive yarn feeder 24 which comprises a rotating weft-winding drum 26 which draws yarn F' from a reel R (only diagrammatically shown) and feed it to the textile machine (not shown).
  • the tension of the yarn delivered by the feeder is controlled to be substantially constant at a desired level, by varying the speed of rotation of drum 26 on the basis of a signal received from a general tension sensor TS' attached to the feeder and subjected to the yarn tension in a way similar to the previous embodiment.
  • a tension sensor 28 according to the invention is shown, which is suitable for applications with both negative yarn feeders and positive yarn feeders.
  • Tension sensor 28 comprises a support or basement 30 having a lower face 32 and an opposite upper face 34 provided with a depression 36 terminating at a longitudinal end of the basement, on which a feeler 38, which will be better described below, is fixed.
  • a printed circuit 40 is attached to lower face 32 by a screw 42 and a nut (not shown) received in a hexagonal seat 44 formed in depression 36.
  • Basement 30 also has a transverse hole 45 in order to be fixed to the feeder by a screw, as shown in Figs. 1, 2 .
  • Feeler 38 comprises a plate 46 made of a ceramic material and provided with a mounting portion 48 having an elongated flexible projection 50 extending therefrom, which is provided with a sliding block 51 of a semi-cylindrical shape at its free end, on which the yarn is slidable.
  • Flexible projection 50 provides a feeler arm that, in use, deviates the path of the yarn with its sliding block 51, whereby the arm is subjected to the transverse component of the yarn tension.
  • main resistors R1, R2, R3, R4 are disposed with the so-called "thick film” technology, two of which, R1 and R3, are arranged on the upper surface of plate 46.
  • the other two resistors R2, R4 are arranged on the opposite surface ( Fig. 5 ).
  • the main resistors are connected to one another to form a Wheatstone bridge ( Fig. 6 ).
  • Further four resistors are disposed on mounting portion 48, two of which, RP1 and RP2, are connected in parallel to two main resistors arranged adjacent to each other, R1 and R4 respectively, and are required for the "zero setting" of the bridge.
  • the other two resistors, RS1, RS2, are connected in series to the other two main resistors, R2 and R3 respectively, for the compensation in temperature of plate 46.
  • the four ends of the Wheatstone bridge lead to respective contact pins 52, which are welded to the edge of mounting portion 48 facing away from elongated projection 50, and extend at right angles towards printed circuit 40, where they engage respective rheophores 54.
  • Contact pins 52 are received in a recess 55 formed in the corresponding end of basement 30. In a conventional way, the bridge generates an output signal that changes as a function of the bending of the projection and, consequently, of the yarn tension.
  • a rectangular base 56 of a ceramic material is connected to the lower surface of mounting portion 48 by vitrification. Rectangular base is received in depression 36 and is fastened to the latter by a pair of screws 58, 60 with nuts 62, 64. Screws 58, 60 are inserted in respective holes 66, 68 bored in base 56 at the opposite sides of plate 46, and in respective passages 70, 72 formed in the flat depression 36.
  • Fig. 7 the error of measurement over the temperature, with respect to the plate per se is shown by continuous line, to the plate anchored according to the prior art by dotted lines, and to the plate anchored according to the invention by chain lines. It is evident that the error of measurement D (in grams) over the temperature T (in °C), with a tension sensor according to the invention, is about one tenth of the error with a prior art sensor. This is due to the fact that base 56 does not influences the deformation of elongated projection 50 because it is bonded by vitrification under mounting portion 48, in order to connect plate 46 to basement 30. Therefore, the elongated projection has a characteristic of bending with respect to the temperature that is very similar to the theoretical characteristic, thereby resulting in a more accurate, and more raliable, signal generated by the sensor.

Landscapes

  • Tension Adjustment In Filamentary Materials (AREA)
EP07425767A 2007-12-03 2007-12-03 Capteur de tension de fil pour dispositifs d'alimentation en fil Withdrawn EP2067728A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07425767A EP2067728A1 (fr) 2007-12-03 2007-12-03 Capteur de tension de fil pour dispositifs d'alimentation en fil
DE200860001545 DE602008001545D1 (de) 2007-12-03 2008-06-28 Garnspannungssensor für Garnzuführgeräte
EP20080011753 EP2067729B1 (fr) 2007-12-03 2008-06-28 Capteur de tension de fil pour dispositifs d'alimentation en fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07425767A EP2067728A1 (fr) 2007-12-03 2007-12-03 Capteur de tension de fil pour dispositifs d'alimentation en fil

Publications (1)

Publication Number Publication Date
EP2067728A1 true EP2067728A1 (fr) 2009-06-10

Family

ID=39327068

Family Applications (2)

Application Number Title Priority Date Filing Date
EP07425767A Withdrawn EP2067728A1 (fr) 2007-12-03 2007-12-03 Capteur de tension de fil pour dispositifs d'alimentation en fil
EP20080011753 Active EP2067729B1 (fr) 2007-12-03 2008-06-28 Capteur de tension de fil pour dispositifs d'alimentation en fil

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP20080011753 Active EP2067729B1 (fr) 2007-12-03 2008-06-28 Capteur de tension de fil pour dispositifs d'alimentation en fil

Country Status (2)

Country Link
EP (2) EP2067728A1 (fr)
DE (1) DE602008001545D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114506738A (zh) * 2022-03-11 2022-05-17 德清千和精密机械有限公司 一种伺服张力器的张力测量结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITTO20120805A1 (it) 2012-09-17 2014-03-18 Lgl Electronics Spa Alimentatore di filato a tamburo rotante per lavorazioni tessili con selezione del filato.
CN105910744B (zh) * 2016-06-20 2024-09-03 新昌县维软电子科技有限公司 一种张力传感器

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457616A (en) * 1946-07-16 1948-12-28 Douglas Aircraft Co Inc Metal foil type strain gauge and method of making same
US4752044A (en) 1986-08-16 1988-06-21 Gustav Memminger Yarn supply apparatus with electronic yarn tension control, particularly for knitting machines having rapidly varying yarn supply requirements
US4953367A (en) 1988-07-15 1990-09-04 Memminger Iro Gmbh System for controlling supply of yarn to a yarn utilization apparatus, particularly multi-feed circular knitting machine
EP0475001A2 (fr) * 1990-08-31 1992-03-18 Atochem North America, Inc. Capteur de matière
EP0534226A1 (fr) * 1991-09-24 1993-03-31 Kabushiki Kaisha TEC Palpeur de contrainte avec un circuit à jauges de contrainte et balance à capteur de force utilisant ce palpeur de contrainte
EP0707102A2 (fr) 1994-10-10 1996-04-17 L.G.L. ELECTRONICS S.p.A. Frein de fil positif modulé pour fournisseurs de trame
WO1999059909A1 (fr) 1998-05-19 1999-11-25 Eltex Of Sweden Ab Emetteur de signaux
WO2004039714A1 (fr) * 2002-10-23 2004-05-13 Memminger-Iro Gmbh Capteur de tension de fil

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457616A (en) * 1946-07-16 1948-12-28 Douglas Aircraft Co Inc Metal foil type strain gauge and method of making same
US4752044A (en) 1986-08-16 1988-06-21 Gustav Memminger Yarn supply apparatus with electronic yarn tension control, particularly for knitting machines having rapidly varying yarn supply requirements
US4953367A (en) 1988-07-15 1990-09-04 Memminger Iro Gmbh System for controlling supply of yarn to a yarn utilization apparatus, particularly multi-feed circular knitting machine
EP0475001A2 (fr) * 1990-08-31 1992-03-18 Atochem North America, Inc. Capteur de matière
EP0534226A1 (fr) * 1991-09-24 1993-03-31 Kabushiki Kaisha TEC Palpeur de contrainte avec un circuit à jauges de contrainte et balance à capteur de force utilisant ce palpeur de contrainte
EP0707102A2 (fr) 1994-10-10 1996-04-17 L.G.L. ELECTRONICS S.p.A. Frein de fil positif modulé pour fournisseurs de trame
WO1999059909A1 (fr) 1998-05-19 1999-11-25 Eltex Of Sweden Ab Emetteur de signaux
WO2004039714A1 (fr) * 2002-10-23 2004-05-13 Memminger-Iro Gmbh Capteur de tension de fil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114506738A (zh) * 2022-03-11 2022-05-17 德清千和精密机械有限公司 一种伺服张力器的张力测量结构
CN114506738B (zh) * 2022-03-11 2023-10-20 德清千和精密机械有限公司 一种伺服张力器的张力测量结构

Also Published As

Publication number Publication date
EP2067729A1 (fr) 2009-06-10
EP2067729B1 (fr) 2010-06-16
DE602008001545D1 (de) 2010-07-29

Similar Documents

Publication Publication Date Title
US8246041B2 (en) System and method for monitoring image forming machine media stack height and method of calibrating stack height sensing in the monitoring system
US20030047009A1 (en) Digital callipers
EP1029818A3 (fr) Rouleau de matière en bande pour l'utilisation dans un dispositif d'emballage de médicaments
EP2067729B1 (fr) Capteur de tension de fil pour dispositifs d'alimentation en fil
BRPI0413735B1 (pt) dispositivo de enrolamento de bobina
KR101173137B1 (ko) 비접촉식 롤투롤 인쇄 장치의 장력 제어를 위한 구조 및 방법
CN100480764C (zh) 驱动器
JP2002255108A (ja) 結束工具
CN214733237U (zh) 一种具有纠偏功能的收卷系统
EP0864392A1 (fr) Tête de jonction
US10900765B2 (en) Form measuring apparatus
EP0590725B1 (fr) Dispositif de contrôle automatique de la tension de la chaíne dans un métier à tisser
US6634293B2 (en) Ink metering system in a printing press with piezoelectric actuating element
JP2001026326A (ja) 給紙分離装置
JP4279376B2 (ja) ラベルプリンタ
US4517735A (en) Apparatus and method for tensioning resistive wire
WO2000002027A1 (fr) Procede et appareil pour mesurer la tension d'une bande continue en mouvement
WO2001065202A1 (fr) Pieds a coulisse numeriques
CN207496270U (zh) 嵌入式打印装置
JPH0345140Y2 (fr)
US9725834B2 (en) Method and device for measuring the fabric tension in a weaving machine
CA1128474A (fr) Colleuse d'etiquettes avec detecteur de presence des etiquettes
KR100286804B1 (ko) 도트 프린터의 헤드 이송거리 조정장치
JPH11255431A (ja) テンション装置
JPH06155853A (ja) シリアルドットインパクトプリンタにおける自動紙厚調整装置

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: A1

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 MT NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

AKX Designation fees paid
REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20091211