EP3354784B1 - Procédé de préparation d'un fil supérieur d'extrémité d'une couture à réaliser dans un matériau à coudre, avec un excès de couture défini, ainsi que machine à coudre pour la mise en oeuvre de ce procédé - Google Patents

Procédé de préparation d'un fil supérieur d'extrémité d'une couture à réaliser dans un matériau à coudre, avec un excès de couture défini, ainsi que machine à coudre pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP3354784B1
EP3354784B1 EP17209953.3A EP17209953A EP3354784B1 EP 3354784 B1 EP3354784 B1 EP 3354784B1 EP 17209953 A EP17209953 A EP 17209953A EP 3354784 B1 EP3354784 B1 EP 3354784B1
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EP
European Patent Office
Prior art keywords
thread
needle thread
needle
sewing
seam
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.)
Active
Application number
EP17209953.3A
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German (de)
English (en)
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EP3354784A1 (fr
Inventor
Christoph Heckner
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.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler 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.)
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Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP3354784A1 publication Critical patent/EP3354784A1/fr
Application granted granted Critical
Publication of EP3354784B1 publication Critical patent/EP3354784B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/04—Automatically-controlled tensioning devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B45/00—Applications of measuring devices for determining the length of threads used in sewing machines

Definitions

  • the invention relates to a method for producing a seam top thread of a seam to be formed in the material to be sewn with a defined nominal seam protrusion, in particular of at most 10 mm.
  • the invention further relates to a sewing machine for performing such a method.
  • a sewing machine is known for example from the EP 2 028 311 A2 .
  • the DE 32 32 813 A1 discloses a method for controlling an upper thread in a sewing machine.
  • the US 4,215,641 discloses an electronic control of an upper thread in a sewing machine.
  • the DE 10 2011 005 198 A1 and the DE 10 2010 043 906 A1 each disclose a sewing machine and a method for producing a seam start with such a sewing machine.
  • the DE 103 21 537 A1 discloses an apparatus for controlling an upper thread of a sewing machine.
  • a sewing process is also known from the CN 1 290 777 A .
  • Another sewing method is known from the EP 2 253 753 A2 .
  • an upper thread preparation unit which is equipped with a Interacting upper thread clamp
  • the defined upper thread quantity is provided for the execution of a thread cutting stitch.
  • a defined amount of upper thread is available for producing a seam end, which on the one hand leads to a reproducible thread cutting process and on the other hand results in a precisely defined amount of upper thread for the subsequent seam at the beginning of the seam.
  • the upper thread can be kept optimally short when sewing on a seam, for example, without this impairing the security of knotting when sewing on.
  • the sewing process is thus reproducible and can be realized with an optimally small amount of upper thread.
  • the upper thread preparation unit can be arranged in the upper thread run between the upper thread clamp and the thread lever.
  • the nominal seam protrusion can be a maximum of 10 mm, but can also be significantly larger for certain applications, for example when sewing leather, for example more than 20 mm, for example in the range of 50 mm.
  • the target seam protrusion can be in the range of 5 mm.
  • a corresponding thread resistance generating unit can be formed by an upper thread tensioning device which is provided anyway in any case.
  • the thread resistance generation unit can be arranged in the upper thread run between the upper thread preparation unit and the thread lever.
  • the advantages of a sewing machine according to claim 3 correspond to those which have already been explained above with reference to the method.
  • the sewing machine can have another upper thread clamp in the upper thread run have between the thread lever and the sewing needle. This further upper thread clamp can also be designed to be controllable.
  • a pivotable thread pulling device according to claim 4 has proven itself as the upper thread preparation unit.
  • An adjustable stop according to claim 5 enables different operating modes of the upper thread preparation unit, so that in particular different defined quantities of upper thread can be provided.
  • This makes it possible, for example, to use the upper thread preparation unit on the one hand for the production method explained above and on the other hand for a method which is used in connection with, for example, the EP 2 028 311 A2 has been described. Both methods can also be combined with one another, so that in addition to the amount of upper thread reproducibly provided for the thread cutting stitch, the upper thread is withdrawn when sewing on a seam during the first stitches, as is shown in FIG EP 2 028 311 A2 is described.
  • a solenoid according to claim 6 has proven itself in practice.
  • a thread resistance generating unit according to claim 7 can be used for the method according to claim 2.
  • a sewing machine 1 has an upper arm 2 and a lower housing-like base plate 3, which are connected to one another by a stand 4 to form a C-shaped housing.
  • arm 2 there is an arm shaft 5 (cf. Fig. 2 ) stored, which can be driven by a motor by means of a belt drive accommodated in the stand 4.
  • a central control device 6 is connected to the motor Fig. 1 is shown schematically in the upper arm 2, but which can also be arranged elsewhere and also relative to the sewing machine 1 externally and connected to it, for example, via a cable harness.
  • a needle bar 7 is driven up and down, at the lower end of which a needle 8 is mounted.
  • An upper thread 9 runs through an eye of the needle 8 (cf. Fig. 2 ).
  • a gripper 10 is arranged in the base plate 3 and is derived in a conventional manner from the arm shaft 5 about a vertical axis of rotation 11 (cf. Fig. 2 ) can be driven in rotation.
  • a supply of a lower thread is located in a bobbin or thread winding housing 12 of the hook 10.
  • Fig. 2 shows the guidance of the upper thread 9 of the sewing machine 1 in detail.
  • a first upper thread clamp 14 is arranged from the eye in the needle 8 in the supply-side upper thread course against the upper thread transport direction, that is to say upstream, and has a clamping plate 15 which can be displaced relative to a base body 16 of the first upper thread clamp 14.
  • the first upper thread clamp 14 is in signal connection with the control device 6 and can be displaced between a thread clamping position in which the upper thread 9 is clamped at the location of the first upper thread clamp 14 and a thread release position in which the first upper thread clamp 14 releases the upper thread 9.
  • the upper thread 9 runs essentially vertically.
  • a place of passage of the upper thread 9 through the first upper thread clamp 14 can be specified with the aid of a plurality of thread through openings 17 in the base body 16.
  • the upper thread 9 runs in the second thread passage opening 17 from the right of a total of four thread passage openings arranged transversely to the thread transport direction.
  • a thread lever 18 is arranged upstream of the first upper thread clamp 14, the up and down movement of which is also derived from the arm shaft 5 in a manner known per se.
  • the upper thread 9 still runs through a guide eye between a thread lever eyelet 19 arranged at the free end of the thread lever 18 and the first upper thread clamp 14 20, the most in the Fig. 2 upper end of the base body 16 is attached.
  • the upper thread 9 passes through an upper thread tension spring unit 20a and then upper thread main tensioning device 21.
  • the latter has two main tension transmitters 22, which work in a manner known per se and are arranged directly behind one another in the upper thread transport direction.
  • the upper thread main tensioning device 21 stands with the central one Control device 6 in signal connection.
  • the main tension transmitters 22 set the upper thread 9 under a predetermined thread tension when activated by the control device 6.
  • the upper thread 9 passes through a further guide eyelet 23 which can be displaced transversely to the upper thread transport direction.
  • a thread pulling device 24 is arranged upstream of the two main tension transmitters 22.
  • the thread pulling device 24 represents an upper thread supply unit in the upper thread run.
  • the thread pulling device 24 has a pivotable extension arm 25, which is articulated via a pivot joint 26 to a clamping plate 27 of a second upper thread clamp 28.
  • the thread pulling device 24 is therefore mounted on the clamping plate 27 of the second upper thread clamp 28.
  • the thread pulling device 24 is arranged in the upper thread run after this second upper thread clamp 28, that is to say downstream of it.
  • the boom 25 of the thread pulling device 24 has a thread eyelet 29 which can be deflected transversely to the thread path of the upper thread 9 between the upstream main tension generator 22 and the second upper thread clamp 28.
  • the boom 25 is convertible between one in the Fig. 2 shown neutral position and one in the Fig. 4 Thread pulling position shown, in which the upper thread 9 between the upper thread main tensioning device 21 and the second upper thread clamp 28 takes a thread path that is longer by a thread path difference than the corresponding thread path of the upper thread 9 in the jib 25 in the neutral position.
  • This thread path difference is, for example, 20 millimeters in the embodiment shown.
  • the thread path difference can also have a different value and can be in the range between 10 mm and 100 mm and, for example, be 30 mm, 40 mm, 50 mm, 60 mm, 70 mm or 80 mm.
  • a thread guide pin 31 is arranged in the upper thread course on a mounting plate 30 which is mounted on the arm 2.
  • the upper thread 9 runs over both thread guide pins 31 and between the thread guide pins 31 over a corner through the thread eyelet 29 of the arm 25.
  • the two thread guide pins 31 have the effect that regardless of whether the arm 25 is in the thread pulling position or in the Is neutral position, the upper thread 9 runs out of the second upper thread clamp 28 at the same position and enters the upstream main tension sensor 22.
  • the boom 25 can be switched between the neutral position and the thread pulling position by an electromagnetic drive, which in turn is in signal connection with the control device 6.
  • an electromagnetic drive the boom 25 can also be driven pneumatically or by a stepper motor.
  • An upper thread pretensioning device 32 is arranged upstream of the second upper thread clamp 28, which also works in a manner known per se and can be in signal connection with the control device 6.
  • the upper thread main tensioning device 21 with the two main tension transmitters 22, the second upper thread clamp 28 with the thread pulling device 24 mounted thereon and the upper thread tensioning device 32 are attached to the mounting plate 30.
  • the upper thread 9 passes through a thread passage opening 33, which is in the mounting plate 30 in one in the Fig. 2 upper and forward bent edge area by 90 °. Upstream of the thread passage opening 33 there is an upper thread bobbin, not shown, as the upper thread supply.
  • a rotation angle scale 35 is arranged which indicates a full rotation of the arm shaft 5 divided into 360 angular degree steps.
  • the Figure 2 shows the arm shaft 5 in the position 205 °.
  • the needle bar 7 has returned somewhat from its bottom dead center, which was reached at 180 °, so that an upper thread loop has formed next to the eye of the needle 8.
  • a hook tip of the hook 10 can engage in the upper thread loop and then take the upper thread 9 with it.
  • Figure 5 shows an example of a sewing material section 36 in the area of the beginning of a seam 37, a first stitch being short and the following stitches being carried out with a normal stitch length. Shown is the upper thread 9 with the seam start upper thread 38 and the lower or looper thread 39, the seam start lower thread of which has a comparable length as the seam start upper thread 38. Both seam start threads have a nominal seam protrusion A of at most 10 mm.
  • the sewing machine 1 still has one in the Figure 1 only indicated upper thread knife 40 for cutting the upper thread 9 between successive seams.
  • the sewing machine 1 operates as follows to produce the seam top thread 38 of the seam 37 with the nominal seam protrusion A of at most 10 mm: First of all, a defined amount of upper thread is provided in the upper thread run between the upper thread clamp 28 and the sewing needle 8 for performing a thread cutting stitch for an upper thread cutting process. This is done with the upper thread preparation unit by switching the thread pulling device 24 between that in FIG Figure 2 shown neutral position and a thread pulling position achieved by pivoting the boom 25 by a few 10 ° counterclockwise. The upper thread clamp 28 is then closed, so that after the upper thread clamp 28 has been closed, no upper thread 9 can be pulled from the upper thread supply. After closing the upper thread clamp 28, the thread pulling device 24 is again in the in the Figure 2 shown neutral position transferred.
  • the thread trimming stitch can now be sewn with the defined amount of upper thread be, the thread lever 18 passes the amount of upper thread provided to the sewing needle 8. Following the sewing of the thread cutting stitch, the upper thread 9 is then cut off with the upper thread knife 40. For the sewing of the next seam there is now a precisely defined upper thread protrusion with respect to the eye of the sewing needle 8.
  • the seam start upper thread 38 of the subsequent seam 37 then has the predetermined nominal seam protrusion A.
  • the thread pulling device 24 is actuated before the thread cutting stitch, that is to say at the end of the seam formation.
  • Both methods that is to say the basically already known method “thread retraction from the beginning of the seam” and the method described above in detail “thread insertion for thread cutting” can be carried out in combination with one another.
  • a thread resistance is established between the thread pulling device 24 and the needle 8 before being provided the defined amount of upper thread and lowered again before sewing the thread trimming stitch. This is done by correspondingly activating the main tensioner 22 before providing the defined amount of upper thread to increase the thread resistance and subsequently deactivating the main tensioner 22 after providing the defined amount of upper thread and before sewing the thread trimming stitch to lower the thread resistance.
  • a thread resistance generating unit is formed by the upper thread main tensioner 21.
  • thread guide pins 31 lie in the upper thread guide according to the Figures 3 and 4th two thread eyelets 43 in front.
  • the stop 44 comprises a solenoid 45 with a piston 46, which in the Figure 3 in a fully retracted and in the Figure 4 is shown in a fully extended position. Furthermore, the stop has a stop component 47 which is fixedly mounted on the mounting plate 30.
  • Figure 3 shows the thread pulling device 24, i.e. the upper thread preparation unit, in the thread pulling position for an upper thread feeding for the thread cutting function, i.e. in the position in which, as explained above, a defined amount of upper thread is provided by the thread pulling device 24 in preparation for the thread cutting stitch (Stop position "thread feed").
  • the thread path difference generated in this thread feed thread pulling position can be, for example, 50 mm.
  • the piston 46 is retracted and inactive as a stop.
  • the stop component 47 on which the boom 25 strikes is active as a stop.
  • the Figure 4 shows the thread pulling position, which is used when pulling the thread out of the seam according to the sequence in the EP 2 028 311 A2 is described (stop position "thread retraction").
  • this thread pulling position the upper thread withdrawal from the beginning of the seam is provided with a thread path difference of, for example, 20 mm.
  • the thread path difference is smaller than in the "thread feed” stop position.
  • the piston 46 is fully extended and active as a stop for the boom 25.
  • the stop component 47 is inactive.
  • This provisioning process can be controlled by the upper thread preparation unit coupled with a control of the upper thread knife 40.
  • the upper thread knife 40 is cam-controlled, for example a change of the thread pulling device 24 from the neutral position into the thread pulling position can be controlled as soon as the curve control for the upper thread knife 40 is activated.
  • control device 6 which is in signal connection with the above-described driven components.

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

Claims (7)

  1. Procédé de formation, au moyen d'une machine à coudre (1), d'un fil supérieur d'extrémité (38) d'une couture (37) à réaliser dans le matériau à coudre (36), avec un rentré de couture de consigne (A) défini, la machine à coudre comprenant
    - une alimentation pour un fil supérieur (9),
    - une barre à aiguille (7) comportant une aiguille à coudre (8) permettant de guider le fil supérieur (9) à travers le matériau à coudre (36), l'aiguille à coudre (8) pouvant être déplacée de manière entraînée de haut en bas,
    - une pince (10) permettant de saisir le fil supérieur (9) pendant la formation du point,
    - un levier de fil (18) permettant d'enfiler le fil supérieur (9) dans les boucles,
    - un pince-fil supérieur (28 ; 41) commandable dans le passage de fil supérieur depuis le levier de fil (18),
    - une unité de fourniture de fil supérieur (24) réalisée sous la forme d'un dispositif de tirage de fil dans le passage de fil supérieur en direction du pince-fil supérieur (28 ; 41),
    - un couteau à fil supérieur (40) permettant de couper le fil supérieur (9) entre des coutures successives,
    caractérisé par les étapes successives suivantes :
    - fourniture, au moyen de l'unité de fourniture de fil supérieur (24), d'une quantité définie de fil supérieur dans le passage de fil supérieur entre le pince-fil supérieur (28 ; 41) commandable et l'aiguille à coudre (8) afin de réaliser un point de coupe de fil pour un processus de coupe de fil supérieur, ladite fourniture étant effectuée par l'actionnement du dispositif de tirage de fil,
    - fermeture du pince-fil supérieur (28 ; 41) de telle manière qu'après la fermeture du pince-fil supérieur (28 ; 41) aucun fil supérieur (9) ne puisse être tiré de l'alimentation de fil supérieur,
    - couture du point de coupe de fil en utilisant la quantité définie de fil supérieur,
    - coupure du fil supérieur (9) à l'aide du couteau à fil supérieur (40).
  2. Procédé selon la revendication 1, caractérisé en ce que la résistance du fil entre l'unité de fourniture de fil supérieur (24) et l'aiguille à coudre (8) est augmentée avant que la quantité définie de fil supérieur ne soit disponible et est diminuée à nouveau avant que le point de coupe de fil ne soit cousu.
  3. Machine à coudre (1) destinée à la mise en œuvre du procédé selon la revendication 1 ou 2,
    - comportant une alimentation pour un fil supérieur (9),
    - une barre à aiguille (7) comportant une aiguille à coudre (8) permettant de guider le fil supérieur (9) à travers le matériau à coudre (36), l'aiguille à coudre (8) pouvant être déplacée de manière entraînée de haut en bas,
    - une pince (10) permettant de saisir le fil supérieur (9) pendant la formation du point,
    - un levier de fil (18) permettant d'enfiler le fil supérieur (9) dans les boucles,
    - un pince-fil supérieur (28 ; 41) commandable dans le passage de fil supérieur depuis le levier de fil (18),
    - une unité de fourniture de fil supérieur (24) réalisée sous la forme d'un dispositif de tirage de fil dans le passage de fil supérieur en direction du pince-fil supérieur (28 ; 41),
    - un couteau à fil supérieur (40) permettant de couper le fil supérieur (9) entre des coutures successives,
    - l'unité de fourniture de fil supérieur (24) étant réalisée sous la forme d'un dispositif de tirage de fil pouvant être actionné, caractérisée par un dispositif de commande (6) permettant de commander le déroulement du procédé selon les étapes successives définies dans la revendication 1, le dispositif de tirage de fil étant actionné avant la fermeture du pince-fil supérieur.
  4. Machine à coudre selon la revendication 3, caractérisée en ce que l'unité de fourniture de fil supérieur (24) est réalisée sous la forme d'un dispositif de tirage de fil pouvant pivoter de manière entraînée.
  5. Machine à coudre selon la revendication 3 ou 4, caractérisée par une butée réglable (44) avec laquelle l'unité de fourniture de fil supérieur (24) coopère pour régler une quantité de fil supérieur à fournir.
  6. Machine à coudre selon la revendication 5, caractérisée en ce que la butée (44) comporte un aimant de levage (45).
  7. Machine à coudre selon l'une des revendications 3 à 6, caractérisée en ce qu'une unité de génération de résistance de fil (21), destinée à augmenter et à diminuer la résistance de fil, est formée par un dispositif de tension de fil supérieur dans le passage de fil supérieur en direction de l'unité de fourniture de fil supérieur (24).
EP17209953.3A 2017-01-26 2017-12-22 Procédé de préparation d'un fil supérieur d'extrémité d'une couture à réaliser dans un matériau à coudre, avec un excès de couture défini, ainsi que machine à coudre pour la mise en oeuvre de ce procédé Active EP3354784B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017201240.4A DE102017201240A1 (de) 2017-01-26 2017-01-26 Verfahren zur Erzeugung eines Naht-Anfangsoberfadens einer in Nähgut auszubildenden Naht mit einem definierten Soll-Nahtüberstand sowie Nähmaschine zur Durchführung eines derartigen Verfahrens

Publications (2)

Publication Number Publication Date
EP3354784A1 EP3354784A1 (fr) 2018-08-01
EP3354784B1 true EP3354784B1 (fr) 2020-03-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17209953.3A Active EP3354784B1 (fr) 2017-01-26 2017-12-22 Procédé de préparation d'un fil supérieur d'extrémité d'une couture à réaliser dans un matériau à coudre, avec un excès de couture défini, ainsi que machine à coudre pour la mise en oeuvre de ce procédé

Country Status (5)

Country Link
EP (1) EP3354784B1 (fr)
KR (1) KR102481545B1 (fr)
CN (1) CN108360163B (fr)
DE (1) DE102017201240A1 (fr)
TW (1) TWI787232B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113430736A (zh) * 2021-07-28 2021-09-24 佛山市启创科技发展有限公司 一种电脑枪刺地毯机自动送线装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215641A (en) 1979-07-05 1980-08-05 The Singer Company Electronic control of needle thread in a sewing machine
DE3232813A1 (de) 1982-08-26 1984-03-08 Tokyo Juki Industrial Co., Ltd., Tokyo Verfahren zum steuern des oberen fadens in einer naehmaschine
CN1101491C (zh) * 1999-06-28 2003-02-12 重机株式会社 缝纫机的线张力控制装置
JP4047624B2 (ja) 2002-05-14 2008-02-13 Ｊｕｋｉ株式会社 ミシン
DE102007039596A1 (de) 2007-08-22 2009-02-26 Dürkopp Adler AG Nähmaschine sowie Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine
DE102009036988A1 (de) * 2009-05-12 2010-12-16 Nähmaschinenfabrik Emil Stutznäcker GmbH & Co. KG Verfahren zum Nähen eines Nähguts
DE102010043906A1 (de) 2010-11-15 2012-05-16 Dürkopp Adler AG Nähmaschine sowie Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine
DE102011005198A1 (de) * 2011-03-07 2012-09-13 Dürkopp Adler AG Nähmaschine sowie Verfahren zum Nähen eines Nahtanfangs mit einer derartigen Nähmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
TWI787232B (zh) 2022-12-21
CN108360163A (zh) 2018-08-03
TW201835411A (zh) 2018-10-01
CN108360163B (zh) 2021-02-05
KR20180088303A (ko) 2018-08-03
KR102481545B1 (ko) 2022-12-27
DE102017201240A1 (de) 2018-07-26
EP3354784A1 (fr) 2018-08-01

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