EP0359707B1 - Vorrichtung zur Spannunsregelung eines sich lotrecht bewegenden Fadens und Verwendung einer solchen Vorrichtung - Google Patents

Vorrichtung zur Spannunsregelung eines sich lotrecht bewegenden Fadens und Verwendung einer solchen Vorrichtung Download PDF

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Publication number
EP0359707B1
EP0359707B1 EP89810663A EP89810663A EP0359707B1 EP 0359707 B1 EP0359707 B1 EP 0359707B1 EP 89810663 A EP89810663 A EP 89810663A EP 89810663 A EP89810663 A EP 89810663A EP 0359707 B1 EP0359707 B1 EP 0359707B1
Authority
EP
European Patent Office
Prior art keywords
plates
plate
thread
pair
lips
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
EP89810663A
Other languages
English (en)
French (fr)
Other versions
EP0359707A1 (de
Inventor
Antonio Jimenez
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.)
Mefina SA
Original Assignee
Mefina SA
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 Mefina SA filed Critical Mefina SA
Publication of EP0359707A1 publication Critical patent/EP0359707A1/de
Application granted granted Critical
Publication of EP0359707B1 publication Critical patent/EP0359707B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/02—Manually-controlled tensioning devices

Definitions

  • Sewing machines which include, upstream of the sewing needle, a device for adjusting the tension of the sewing thread comprising at least two substantially flat plates applied against each other and between which this thread passes, a manually controlled device making it possible to clamp these plates, and therefore the wire, with an intensity force characteristic of the desired tension at least on the portion of wire extending downstream of the plates.
  • the present invention relates to an adjustment device of the above type but without the drawback noted and whose essential characteristics are the subject of claim 1.
  • the sewing machine shown in FIG. 1 comprises a lower arm 1, a column 2 carrying an upper arm 3 extending above the arm 1 and ending in a sewing head 4.
  • the arm 1 comprises the fabric drive mechanism and the loop sensor control device, both not shown.
  • the head 4 of the machine has a presser foot 5, a needle bar 6 with a needle 6 is fastened to the free end of the bar 6.
  • the head 4 also carries a wire guide 7 and a device 8 for adjusting of the tension of the thread 9 which, delivered during sewing, from a spool, not shown, passes through the thread guide 7 and then passes through this device to reach the needle 6 a .
  • the device 8 comprises an assembly of three plates 10a, 11a and 10b ( Figure 2) which are slidably mounted on two parallel rods, 12a and 12b, between an element 13 integral with the head 4 of the machine, and a rod support 14 in contact, at its right end, with the left face of the plate 10 b .
  • the rod 14 is slidably mounted in a corresponding opening 15 of a support 16 integral with the head 4 and to which the rods 12a and 12b are fixed above.
  • this device can be used both when the machine will be called upon to work with a single needle and with a double needle.
  • one of the wires will be passed, for example, between the plates 10a and 11 and, the other, between the plate 11 and the plate 10b.
  • the plate 10 a is in the form of a flat metal plate, comprising a rectilinear fold 20 intended to delimit, with the plate 11, a slot for introducing the wire, and the surface has three protruding portions 21, 22a and 22b, obtained by stamping for example, and exceeding the surface of the plate, as well as two pairs of openings, 23a and 23b, for the first pair of these openings, respectively 24a and 24b, for the second.
  • the protruding portion 21 is planar and has a general shape of a cross, the edges of the arms of which include a connecting section 21a of rounded profile, of identical radius of curvature for each pair of arms, each section forming an indentation opening in the immediate vicinity. an opening 23a, or 23b, respectively 24a and 24b.
  • the projecting portion 21 has arms of the same length and that these openings are located, two in pairs, on axes of transverse symmetry of the cross, on either side of it.
  • one, 23a, respectively 24a has a slightly elongated shape, the other, 23b, respectively 24b, being of circular shape. This difference in shape is chosen such to give some play to allow easy passage of the rods 12a and 12b, even if their spacing is not strictly constant.
  • the projecting portions 22a and 22b are arranged in such a way that their respective center is located on the axis of transverse symmetry of the projecting portion 21, axis passing through the openings 24a and 24b, for the portion 22a, and through the openings 23a and 23b, for the portion 22b.
  • the plate 11 is mounted between the plates 10a and 10b.
  • a projecting and flat portion 25 which is obtained by stamping the plate, for that appearing on its obverse, and which, on the reverse, is formed by addition, for example by brazing in the hollow produced by the stamping, of a plate not shown, of shape corresponding to that of the portion 25, this plate projecting from the surface of the plate, as is the case for the projecting portion 25 appearing on the second side of this plate.
  • the protruding portion 25 has an elongated part, of generally triangular shape, 25a, with a rounded apex, the radius of curvature of which corresponds substantially to that of the protruding portions 22a and 22b of the plates 10a and 10b, and a more enlarged part, 25b, of which the edge is attached to the edge of the part 25a by two rounded sections 25c forming corresponding indentations.
  • the radius of curvature of these sections corresponds substantially to that of each indentation 21a between each pair of arms of the raw projecting portion ciform 21 of plates 10a and 10b.
  • the plate 11 On either side of this projecting portion 25, the plate 11 has an opening 26a, respectively 26b, whose shape and spacing correspond to those of the pairs of openings 23a, respectively 23b, or 24a respectively 25b of the plates 10 a , and 10b.
  • the center of the openings 26a and 26b is located on a common axis which is perpendicular to the longitudinal axis of the portion 25, at equal distance, and on either side thereof.
  • the general dimensions of the projecting portion 25, the profile of its edges and its position relative to the openings 26a and 26b are chosen such that, in the assembled position of the plates 10a, 11 and 10b, the rounded parts 25c of the protruding portion 25 of the plate 11, and of the counterpart of this portion protruding on the other face of the latter are located at the right of part of the length of the indentations facing the openings 24a and 24b of the plate 10a, respectively at the openings 23a and 23b of the plate 10b.
  • the projecting portion 25 rests, by its end portion 25a, on the projecting portion 22a of the plate 10a. It is the same with regard to the plate 10b, the projecting portion 22b of which forms a support for the homologous extremal part of the part 25a above, belonging to the projecting portion corresponding, on the other face of the plate, to the serving 25.
  • the edge of the indentations appearing on one as on the other face of the plate 11 and that of the indentations of the plates 10a and 10b covering the first edge above thus delimit two pairs of lips between which the wire 9 passes as well when it enters between the pair of plates concerned only when it leaves it.
  • the device according to the invention does not meet this latter condition since the wire enters the first pair of lips of each pair of plates 10a and 11, respectively 11 and 10b , and leaves the second, through a central portion of each pair of lips and not at the end of these. It follows that the wire is obviously also subjected to the action of a centripetal thrust of the same kind and for the same reasons as those mentioned above but of intensity much lower than it would have been if the wire , as in the cited patent, had passed between these lips at a point much more distant from their central portion.
  • FIGS. 5a and 5b the first of these shows, in longitudinal section along VV of FIG. 3, the position occupied by the various plates of the device according to the invention, when a wire 9 is engaged between the plates 10a and 11.
  • the second illustrates a similar situation in the case of a device of known structure, for example from US Pat. No. 4,123,984.
  • the angle ⁇ of the plate 10 * with respect to the plate 11 * is much greater since it is of the order of 2 ° 48 '. This means that, in the present case, the thread 9 will be much easier to escape from the space comprised between the plates, thereby implying obtaining a poor quality seam due to the irregularities of tension of which the thread is the object.
  • the device described could comprise only one pair of plates (10a, 10b) in particular in the case of a machine having only the possibility of sewing with a single thread and not with two.
  • the angle ⁇ to which reference has been made with reference to FIG. 5a will be of value similar to that cited above: indeed, this result remains acquired since, at image of what has been described, the plates will then be in mutual contact by their respective projecting portions 22a and 22b, and 22b and 22a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Guides For Winding Or Rewinding, Or Guides For Filamentary Materials (AREA)

Claims (10)

  1. Vorrichtung zur Spannungsregelung eines längsbeweglichen Fadens (9), bestehend aus wenigstens zwei benachbarten Platten (10a, 10b, 11), die gegeneinander anliegen udn zwischen denen der Faden durchläuft, wobei die gegenüberliegenden Vorderseiten der Platten jeweils eine Fadenklemmfläche (21, 25) aufweisen, die dazu dient, mit einer entsprechenden Fläche (25, 21) der anderen Platte zusammenzuwirken und deren Rand durch eine Ausbuchtung (21a, 25c) ausgeschnitten ist, die derart angeordnet ist, daß in einer relativen Winkelstellung der Platten die Ausbuchtung (21a) der einen der Platten (10a, 10b) wenigstens teilweise die Ausbuchtung (25c) der anderen Platte (11) derart bedeckt, daß die Ausbuchtungen durch Überlagerung am Rande der Klemmflächen ein Paar Lippen bilden, Einrichtungen (12a, 12b, die die Platten in der Winkelstellung halten, Einrichtungen (12b) zum Führen des Fadens, die diesen veranlassen, zwischen den Klemmflächen (21, 25) der Platten (11, 10a, 10b) die beiden Lippen zu durchlaufen, und Einrichtungen (14), um die Platten mit einer Kraft gegeneinander zu drücken, deren Intensität für die gewünschte Fadenspannung charakteristisch ist,
    dadurch gekennzeichnet, daß
    der Rand der Klemmfläche jeder Platte (10a, 10b, 11) eine zweite Ausbuchtung aufweist, die derart angeordnet ist, daß sie in dieser relativen Winkelstellung der Platten eine der Lippen eines zweiten Paars Lippen bildet, wobei die Fadenführungseinrichtungen (12a, 12b) diesen außerdem veranlassen, den zwischen den Klemmflächen befindlichen Raum über das zweite Paar Lippen (Fig. 3, 4a und 4b) zu verlassen.
  2. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Führungseinrichtungen wenigstens zwei Anlageelemente (12a, 12b) für den Faden aufweisen, die jeweils dem einen und dem anderen Paar Lippen zugewandt sind, die die Platten bilden.
  3. Vorrichtung nach Anspruch 2,
    dadurch gekennzeichnet, daß
    die Anlageelemente (12a, 12b) wenigstens teilweise in der Hohlfläche angeordnet sind, die jeweils von den einen und dem anderen Paar Lippen begrenzt wird, die die Platten bilden.
  4. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    die Klemmfläche (21, 25) jeder Platte (10a, 10b, 11) in deren zentralem Teil vorsteht.
  5. Vorrichtung nach Anspruch 1,
    dadurch gekennzeichnet, daß
    jede Platte (10a, 10b, 11) wenigstens zwei Öffnungen (23a, 23b; 26a, 26b) mit gleicher Abmessung und gleichem bestand von Platte zu Platte aufweist und auf zwei Stangen (12a, 12b) verschiebbar gelagert ist, von denen jede eine bestimmte Öffnung durchläuft, wobei die relative Lage der Öffnungen jeder Platte und der Ausbuchtungen (21a, 25) ihrer jeweiligen Klemmfläche (21, 25) derart gewählt ist, daß eine Überlagerung der entsprechenden Ausbuchtungen der Klemmfläche der Platten erreicht wird und die Stangen (21a, 12a) und die Öffnungen (23, 23b; 26a, 26b) die Einrichtungen zur Winkelpositionierung der Platten bilden.
  6. Vorrichtung nach den Ansprüchen 3 bis 5,
    dadurch gekennzeichnet, daß
    die Anlageelemente aus einem Teil der Stangen (12a, 12b) bestehen.
  7. Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet, daß
    eine der Platten (10a, 10b) auf der die Klemmfläche (21) aufweisenden Seite wenigstens eine Anlagefläche (22, 22b) hat, die in beabstandeter Lage zur Klemmfläche und im wesentlichen abstandsgleich zu den Öffnungen angeordnet ist, und daß die Klemmfläche (25) der zweiten Platten (11) eine solche Breite hat, daß sie in der Drucklage der Platten wenigstens teilweise auf der Anlagefläche (12a, 12b) aufliegt.
  8. Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet, daß
    die Klemmfläche der ersten Platten (10a, 10b) etwa die Form eines Kreuzes hat, dessen Ränder der Arme einen Verbindungsabschnitt zu den benachbarten Armen mit abgerundetem Profil und gleichem Krümmungsradius hat, der sich wenigstens bis nahe zu ihrem Schnittpunkt erstreckt, wobei der Verbindungsabschnitt jedes Paars von Armen die Ausbuchtung (21a) bildet, daß diese Platte zwei Paare von Öffnungen (23a, 23b; 24a, 24b) hat, die jeweils in einem Teil der Platte ausgebildet sind, der zwischen zwei der Klemmfläche benachbarten Armen in unmittelbarer Nähe des Verbindungsabschnittes ihrer Ränder liegt, und daß diese erste Platte zwei Anlageflächen hat, von denen durch eine eine geometrische Achse verläuft, die gleichzeitig durch ein erstes Paar von Öffnungen verläuft, die zwischen zwei Paaren gegenüberliegender Arme des kreuzförmigen Profils der Klemmfläche ausgebildet sind, wobei die andere eine zur ersten symmetrische Lage einnimmt und auf der Achse liegt, die durch das zweite Paar von Öffnungen verläuft.
  9. Vorrichtung nach Anspruch 8,
    dadurch gekennzeichnet, daß
    sich die Klemmfläche (25) der zweiten Platte (11) in Längsrichtung und symmetrisch zwischen den Öffnungen (26a, 26b) längs einer von diesen abstandsgleich liegenden geometrischen Achse erstreckt, wobei wenigstens ein Teil (25c) des Randes dieser Fläche zwei Ausbuchtungen bildet, die sich jeweils nahe einer dieser Öffnungen in deren Richtungen öffnet.
  10. Verwendung der Vorrichtung nach einem der Ansprüche 1 bis 9 in einer Nähemaschine zum Spannen des Nähfadens.
EP89810663A 1988-09-16 1989-09-05 Vorrichtung zur Spannunsregelung eines sich lotrecht bewegenden Fadens und Verwendung einer solchen Vorrichtung Expired - Lifetime EP0359707B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3454/88 1988-09-16
CH3454/88A CH676589A5 (de) 1988-09-16 1988-09-16

Publications (2)

Publication Number Publication Date
EP0359707A1 EP0359707A1 (de) 1990-03-21
EP0359707B1 true EP0359707B1 (de) 1993-05-26

Family

ID=4256292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810663A Expired - Lifetime EP0359707B1 (de) 1988-09-16 1989-09-05 Vorrichtung zur Spannunsregelung eines sich lotrecht bewegenden Fadens und Verwendung einer solchen Vorrichtung

Country Status (6)

Country Link
US (1) US5042407A (de)
EP (1) EP0359707B1 (de)
JP (1) JPH02191489A (de)
CH (1) CH676589A5 (de)
DE (1) DE68906738T2 (de)
ES (1) ES2043095T3 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2885530B2 (ja) * 1991-04-12 1999-04-26 株式会社鈴木製作所 オーバーロックミシンのかがり方式変換装置
JP3334946B2 (ja) * 1993-06-08 2002-10-15 株式会社鈴木製作所 ミシンの糸供給装置
JPH08336686A (ja) * 1995-06-14 1996-12-24 Singer Nikko Kk ミシンの糸案内装置
US5573192A (en) * 1995-08-15 1996-11-12 Tseng; Hsien-Chang Thread tensioning device for a sewing machine
DE19912291C1 (de) * 1999-03-19 2000-07-13 Duerkopp Adler Ag Knopfloch-Nähmaschine
US8468962B2 (en) * 2011-09-16 2013-06-25 Zeng Hsing Industrial Co., Ltd. Sewing machine with a thread holding device for holding needle thread remaining

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2080893A (en) * 1936-05-15 1937-05-18 Sipp Eastwood Corp Tension means for winding machines
US2720366A (en) * 1952-09-30 1955-10-11 British Celanese Yarn tensioning device
US2758802A (en) * 1952-12-29 1956-08-14 Ind Rayon Corp Tension controlling device
GB808067A (en) * 1956-03-24 1959-01-28 Thomas Holt Ltd Improved device for waxing textile yarns
US3000591A (en) * 1958-10-07 1961-09-19 Willcox & Gibbs Sewing Machine Rotary tension device for sewing machines
CH406806A (de) * 1963-12-20 1966-01-31 Gegauf Fritz Ag Nadelfaden-Spanneinrichtung für Nähmaschinen
CH421673A (de) * 1965-06-11 1966-09-30 Gegauf Fritz Ag Nadelfadenspanneinrichtung an Nähmaschinen
US3366083A (en) * 1966-05-26 1968-01-30 Singer Co Thread tensioning device for sewing machines
DE2000268C3 (de) * 1970-01-05 1974-07-18 Karl Isac Joel Ulricehamn Rosen (Schweden) Tellerbremse für Fäden
JPS582712B2 (ja) * 1975-07-08 1983-01-18 ブラザー工業株式会社 ミシンニオケル イトチヨウリヨクフヨソウチ
CH589559A5 (de) * 1975-12-24 1977-07-15 Mefina Sa
US4092939A (en) * 1976-12-27 1978-06-06 The Singer Company Tension disc assembly
US4123984A (en) * 1977-08-10 1978-11-07 The Singer Company Thread tension discs
JPS55129091A (en) * 1979-03-28 1980-10-06 Brother Ind Ltd Device for giving tension of cotton in sewing machine
US4356781A (en) * 1981-01-12 1982-11-02 The Singer Company Thread handling arrangement for sewing machines

Also Published As

Publication number Publication date
DE68906738T2 (de) 1994-01-05
ES2043095T3 (es) 1993-12-16
JPH02191489A (ja) 1990-07-27
CH676589A5 (de) 1991-02-15
EP0359707A1 (de) 1990-03-21
DE68906738D1 (de) 1993-07-01
US5042407A (en) 1991-08-27

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