EP1882767B1 - Dispositif de surveillance du fil supérieur - Google Patents

Dispositif de surveillance du fil supérieur Download PDF

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Publication number
EP1882767B1
EP1882767B1 EP07405114.5A EP07405114A EP1882767B1 EP 1882767 B1 EP1882767 B1 EP 1882767B1 EP 07405114 A EP07405114 A EP 07405114A EP 1882767 B1 EP1882767 B1 EP 1882767B1
Authority
EP
European Patent Office
Prior art keywords
thread
sensor
monitoring
switching element
regulator spring
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
EP07405114.5A
Other languages
German (de)
English (en)
Other versions
EP1882767A1 (fr
Inventor
Gérard DURVILLE
Niklaus Wacker
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.)
BERNINA International AG
Original Assignee
BERNINA International AG
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 BERNINA International AG filed Critical BERNINA International AG
Publication of EP1882767A1 publication Critical patent/EP1882767A1/fr
Application granted granted Critical
Publication of EP1882767B1 publication Critical patent/EP1882767B1/fr
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/04—Automatically-controlled tensioning devices

Definitions

  • the invention relates to a device for monitoring the upper thread according to the preamble of patent claim 1.
  • Devices of this type are known and serve to monitor thread breakage during sewing. You determine whether the upper thread has been threaded correctly in the sewing machine, especially with automatic threading devices. From the DDR 83897 a device for monitoring the upper thread is known, in which the extending from the thread tensioning device to the thread lever upper thread is deflected on a regulator spring. With the regulator spring a switching flag is connected, which slides at thread tension changes through a light barrier and at an undervoltage, eg caused by Thread breakage, a signal triggers. In this known device, there is only the possibility in the detection of a thread break or - to a limited extent - determine excessive thread tension change. Further detailed information regarding the functions of the sewing machine are not detectable.
  • An object of the present invention is therefore to provide a device for the general monitoring of the upper thread, with which Fadensbonds- and thread movement changes in both the negative and positive sense can be detected and can give conclusions about the functions of various elements of the sewing machine.
  • the device according to the invention it is possible to detect exact values about yarn tension changes as well as yarn movement changes in both directions and conclusions on the setting of the yarn tensioning device, on sewing defects such as yarn balls, missing stitches, failed stitching, etc., but also through the evaluation of the results during the sewing operation to draw on the influence of fabric thickness, stitch length, thread consumption changes per stitch and thread quality. Furthermore, conclusions about the function of the thread lever movement, the fabric thickness, stitch length and thread quality can also be obtained. A service mechanic can also check factory settings.
  • Reference numeral 1 denotes the outline of a household sewing machine. On the sewing machine 1, only the essential parts for understanding the invention are shown.
  • an upper thread bobbin 5 is rotatably mounted on a spool 7.
  • the upper thread 9 leads from the upper thread bobbin 5 directly or indirectly to a thread tensioning device 11 of conventional design, for example consisting of two compressible by an axially acting spring discs 13, between which the upper thread 9 is passed therethrough. From there, the thread 9 passes into a monitoring device, briefly device 15 for monitoring the upper thread 9. Die Device 15, which is the subject of the invention will be described with reference to FIG. 2 , which is an enlargement of the area A in FIG. 1 represents, explained in more detail. Of the device 15, the thread 9 passes further to the thread lever 17 and of this, suitably deflected, to the eye 19 of the needle 21st
  • a regulator spring 25 on one side rotatably held comprises a helically wound section 27 and a tangentially projecting leg 29 from the section 27.
  • the free designed as a thread deflection end 31 of the leg 29 of the regulator spring 25 is preferably guided laterally between a guide device 33.
  • the guide device 33 may comprise two parallel plates or wires 35, which ensure the lateral inlet and outlet of the upper thread 9.
  • the helical portion 27 of the regulator spring 25 wraps around a stub shaft 37, on which a switching lug 39 is pivotally mounted in the form of a circular segment.
  • the switching lug 39 is fixedly connected to the leg 29 of the regulator spring 25 and follows its movements in Tadenschreibs- and / or thread movement changes.
  • the thread tension and Thread movement changes can be caused by changing the thread consumption per stitch, for example.
  • On the periphery of the switching lug 39 are light / dark or black / white areas (not shown) and / or a meander-like contour having projections 41 or other detectable areas arranged. These regions / projections 41 are formed on a cylinder shell segment 43 projecting axially out of the plane of the switching lug 39.
  • the cylinder segment 43 passes through a sensor 45 during a pivoting movement of the switching lug 39, in which two or more sensor regions a, b, c arranged in series are inserted.
  • sensors or sensor areas photocells, proximity switches or the like may be used, with which the presence of the switching flag 39, the current position or the instantaneous pivot angle and the direction of movement and / or the speed of movement is accurately detected.
  • the rotational speed and whose rotation angle can be detected.
  • sensor regions arranged in parallel can also be provided if the light / dark regions 41 are arranged radially offset on the switching lug 39 (not shown).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (5)

  1. Dispositif (15) de surveillance du fil supérieur (9) sur une machine à coudre (1), comprenant un régulateur de fil avec un ressort de régulateur (25), un drapeau de commutation (39) qui est en liaison opératoire avec le ressort de régulateur (25) et qui est inséré entre le levier de fil (17) et un dispositif de tension de fil (11), un capteur (45) pour la surveillance de présence / d'absence du drapeau de commutation (39) au niveau du capteur (45),
    caractérisé en ce que
    le drapeau de commutation (39) comprend au moins deux zones d'identification (41) et en ce que le capteur (45) comprend au moins deux zones de détection (a, b) indépendantes commutées.
  2. Dispositif selon la revendication 1, caractérisé en ce que le drapeau de commutation (39) peut pivoter sur un bout d'arbre (37) et comprend un corps en forme de segment de cercle dans la zone périphérique duquel sont constituées les zones d'identification (41).
  3. Dispositif selon la revendication 2, caractérisé en ce que les zones d'identification sont des zones claires/foncées, des creux et/ou des saillies (41).
  4. Dispositif selon une des revendications 1 à 3, caractérisé en ce que le capteur (45) comprend au moins deux barrières photoélectriques (a, b) juxtaposées ou des détecteurs de proximité en tant que moyens de détection.
  5. Dispositif selon la revendication 4, caractérisé en ce que les moyens de détection sont disposés en parallèle ou en série.
EP07405114.5A 2006-07-28 2007-04-11 Dispositif de surveillance du fil supérieur Ceased EP1882767B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH12302006 2006-07-28

Publications (2)

Publication Number Publication Date
EP1882767A1 EP1882767A1 (fr) 2008-01-30
EP1882767B1 true EP1882767B1 (fr) 2013-07-24

Family

ID=38573069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07405114.5A Ceased EP1882767B1 (fr) 2006-07-28 2007-04-11 Dispositif de surveillance du fil supérieur

Country Status (2)

Country Link
US (1) US7536963B2 (fr)
EP (1) EP1882767B1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8151721B2 (en) * 2009-06-07 2012-04-10 Hsien-Chang Tseng Thread tensioning device for a sewing machine
JP5064539B2 (ja) 2009-11-13 2012-10-31 木下精密工業株式会社 縫製装置の目飛び糸切れチェック装置
US8448588B1 (en) 2011-08-18 2013-05-28 Leonard Samuel Lindley Force sensing device adapted for sensing thread tension in a long-arm or mid-arm sewing machine
CN104499205A (zh) * 2015-01-09 2015-04-08 吴江市友达机械有限公司 一种缝纫机的断线检测装置
JP6626715B2 (ja) * 2016-01-14 2019-12-25 Juki株式会社 ミシン
CN105671810B (zh) * 2016-03-30 2018-04-20 苏州泉海机电制造有限公司 线材检测挑线杆结构
CN106676773A (zh) * 2016-12-29 2017-05-17 杰克缝纫机股份有限公司 一种缝纫机缝线张力检测装置及检测方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD83897A (fr) *
DE83897C (fr)
US3425375A (en) * 1966-10-07 1969-02-04 Jacobs Machine Corp Thread control
US3785308A (en) * 1971-12-09 1974-01-15 R Brandriff Apparatus for monitoring thread tension
JPS56106690A (en) * 1980-01-29 1981-08-25 Brother Ind Ltd Automatic cotton toning device for sewing machine
US4735161A (en) * 1986-10-20 1988-04-05 Sew Simple Systems, Inc. Sewing machine thread breakage detector
DE3818663A1 (de) * 1988-06-01 1989-12-07 Pfaff Ind Masch Fadenwaechter
US5383417A (en) * 1992-10-26 1995-01-24 Norrid; Paul E. Needle thread stitch formation monitor
JP3881860B2 (ja) * 2001-10-12 2007-02-14 Ｊｕｋｉ株式会社 糸の巻取り方法
SE526807C2 (sv) * 2004-03-15 2005-11-08 Vsm Group Ab Styrning av trådtillförsel vid symaskin

Also Published As

Publication number Publication date
US20080022908A1 (en) 2008-01-31
EP1882767A1 (fr) 2008-01-30
US7536963B2 (en) 2009-05-26

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