EP3725929B1 - Machine à coudre industrielle - Google Patents

Machine à coudre industrielle Download PDF

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Publication number
EP3725929B1
EP3725929B1 EP20169729.9A EP20169729A EP3725929B1 EP 3725929 B1 EP3725929 B1 EP 3725929B1 EP 20169729 A EP20169729 A EP 20169729A EP 3725929 B1 EP3725929 B1 EP 3725929B1
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EP
European Patent Office
Prior art keywords
sewing
auxiliary device
thread guide
holes
tension
Prior art date
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Application number
EP20169729.9A
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German (de)
English (en)
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EP3725929A1 (fr
Inventor
Dario MORANDIN
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.)
TorMec Ambrosi SRL
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TorMec Ambrosi SRL
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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

Definitions

  • the present invention relates to an auxiliary device for controlling the upper sewing yarn, which intervenes during the formation of a double chain stitch, for reverse arm industrial sewing machines.
  • the present invention relates to an auxiliary device applicable to a reverse arm industrial sewing machine, which comprises an assembly for the mechanical control of the formation of the stitch and the tension of the upper sewing yarns, where such auxiliary device works in synergy with an original mechanical thread tensioning device applied to the needle bar.
  • This auxiliary device is displaced dynamically between a work position and a rest position, on the basis of the work phases of the sewing machine on which it is installed.
  • the auxiliary device is further provided internally with a dynamic control assembly for controlling the tension of the upper sewing yarns during the formation of the stitch.
  • the auxiliary device is advantageously applied and used in the sector of industrial sewing machines of the reverse arm type.
  • sewing machines operate the mechanical sewing of particular types of superposed fabric in order to obtain items of clothing or even other products of various kinds, e.g. those used in upholstery, curtains and the like, and they are made according to different construction techniques for the purpose of the different operations that they must perform.
  • Sewing machines including industrial ones, in their most common construction, comprise an upper head in which the needle is arranged, which moves alternatively with respect to the work surface, a fabric advancement system and below which the means is arranged that contributes to the formation of the sewing stitch.
  • a looper is provided into which the lower sewing yarn is threaded.
  • Class 400 stitches are formed by two or more sewing yarns, coming from spools external to the machine.
  • the seam has a front (upper) and back side (lower) with the consequent constraints on the positioning of the details for the seam.
  • Class 400 stitches have an excellent hold on the item of clothing and their formation takes place every two penetrations of the needle.
  • class 401 one is formed by the linking of two sewing yarns, an upper one carried by the needle and the lower one by a looper, where both threads come from spools.
  • the closure of the stitch and therefore the formation of the quality of the seam itself is performed during the second penetration.
  • the upper sewing yarn is wound around the lower looper.
  • the upper sewing yarn is dropped from the looper.
  • the devices of the state of the art envisage that the adjustment of the tension of the upper sewing yarn is obtained by using mechanical devices 11, comprising two discs placed in mutual contrast with an upper compression spring and an adjustment nut into which the upper sewing yarn passes.
  • control of the upper sewing yarn, during the formation of the stitch is performed by means of a mechanical thread tensioning device and a series of thread guides, one of which is indicated by number 15, which normally comprise a rigid plate provided with holes crossed by sewing yarns that come from the sewing members.
  • the mechanical thread tensioning device and the thread guides are not adapted to dynamically compensate for the different tensions of the upper sewing yarns in the steps of penetration of the needle into the material, as the material in the same sewing cycle can have different processing thicknesses, with the result that such traditional processing causes the formation of stitches with a tension that may be:
  • knots emerge from the fabric and are formed by an upper sewing yarn, they create thicknesses that can cause irritation to the skin of whoever wears the item of clothing sewn with traditional methods, with all the negative consequences.
  • the current technique teaches increasing the tension applied to the upper sewing yarn, and using further mechanical devices directly connected to the mechanical movement provided by the sewing head.
  • the increased tension given to the upper sewing yarn, during the advancement movement of the material, implies adding further tension to the transported material, and this is noted further in the case of light or very elastic materials.
  • Document DE 102008016774 A1 discloses a sewing machine including a coupling mechanism with a regulation section. This is moved in correspondence with vertical movement of a pressure rod, which is mounted on the machine body for vertical reciprocation.
  • a thread guide lies on the thread path from the spool to the thread puller.
  • a coupling mechanism couples the thread guide with the pressure rod, such that the thread guide is pushed by the regulation section in a first or a second, opposite direction.
  • Document DE 102009048794 A1 discloses a device having a thread release-electromagnet arranged on a rear side of a base plate and provided with a movement pin that is pressed against a thread release plate.
  • a thread tension-primary control device is arranged on the base plate and has a support pin. The support pin is pressed against the thread release plate for tension release of the primary control device during operation of the thread release-electromagnet.
  • a thread tension-secondary control device is arranged on the base plate.
  • a thread drawing-electromagnet is provided on a side of the base plate.
  • Document JP 2019017666 A discloses a sewing machine in which the shape of a loop of a thread is maintained even when a looper is miniaturized, and which can execute single chain stitches smoothly.
  • the sewing machine includes a balance for supplying a thread to a sewing needle, a needle bar reciprocating in a direction orthogonal to a predetermined plane by holding the sewing needle a needle plate having a pinhole through which the sewing needle can pass, and for supporting a sewing object a looper rotating around a rotation axis in a predetermined plane, and for scraping the thread from the sewing needle which has passed through the sewing object and the pinhole and a thread tension device for imparting a tensile force to the thread between the balance and the needle bar.
  • JPS 53111858 A A further example of thread tensioning in sewing machines is disclosed in JPS 53111858 A .
  • the present invention proposes to provide an industrial sewing machine of the reverse arm type, comprising an auxiliary device for the mechanical control of the formation of the stitch and the tension of the upper sewing yarns, where such device works in synergy with the original thread tensioning device applied to the needle bar.
  • This auxiliary device comprises mechanical components crossed by the sewing yarns which are displaced dynamically between a work position and a rest position, where these two positions are determined on the basis of where the sewing cycle is performed, on the material in the "work” condition or outside the material in the "rest” condition.
  • Such auxiliary device according to the invention for the mechanical control of the formation of the stitch and the tension of the upper sewing yarns internally has a dynamic control of the tension of the upper sewing yarns during the formation of the stitch, and therefore is able to eliminate or at least reduce all the drawbacks highlighted above.
  • the auxiliary device according to the invention is made to guarantee the loosening of the tension of the upper sewing yarn, through an adjustment performed using the upper double discs in the opposite way with respect to the current technique in use but, at the same time, thanks to the mechanical control exerted during the formation of the stitch and the dynamic tension system of the upper sewing yarn, it allows an ideal type 401 seam to be obtained, formed visually only by the lower flat chain, without the presence of knots, and very elastic as during the formation of the stitch the upper sewing yarn does not transfer any tension to the material being sewn.
  • the invention in particular makes use of an auxiliary device, to be positioned on the upper sewing head, which works in synergy with the original thread tensioning device of the machine.
  • This auxiliary device is composed of a main support onto which two thread guide assemblies are fixed, an upper one and a lower one, said thread guide assemblies being placed on two different levels, with the interposition between the two lower thread guide assemblies of a flexible element whose position/inclination can be adjusted independently through its block fixed to the main support.
  • the main support of the auxiliary device is automatically arranged between two positions, one defined as an active work position and the other a rest position.
  • the arrangement of these two mechanical positions is performed by means of a pneumatic cylinder.
  • auxiliary device One of the advantages offered by the auxiliary device according to the invention is that of allowing the formation of a sewing stitch with minimum tension between the two sewing yarns, and at the same time with an optimal formation of the chain, as the sewing is performed inside or outside the material to be sewn, obtaining a result that is impossible without such auxiliary device.
  • a further advantage proposed by the invention is that of being able to maintain the seam flat to touch and very elastic, also allowing elasticated materials to be sewn.
  • auxiliary device it is also possible to hide the connection knot between the two sewing yarns within the material and therefore simulate the effect of sewing stitch 301, the lock stitch, and therefore increase the resistance of the double chain seam also to heavy duty washing.
  • the auxiliary device according to the invention is formed by a system with an upper thread guide and two lower thread guides, placed on two different mechanical levels with respect to the main support.
  • the upper thread guide with respect to the original thread tensioning device of the machine is adjustable in its work or rest position based on the type of seam performed (whether the sewing machine is sewing inside or outside the sewing material).
  • the pair of lower thread guides assumes a fixed position with respect to the main support and the distance between them is also fixed.
  • an elastic element is positioned for controlling the tension of the upper sewing yarns.
  • This elastic element is fixed to a block thereof which has the possibility to change the work position and/or angle with respect to the support thereof.
  • the main support of the thread guide is fixed to a stem of the pneumatic cylinder.
  • This pneumatic cylinder enables the device to operate between a work position and a rest position, in order to make the auxiliary device for controlling the compensation stitch formation intervene when necessary.
  • an industrial sewing machine according to the invention is of the reverse arm type and is made using some components of the traditional type with which the devices according to the invention are associated, which compose the new sewing yarn guide and traction system.
  • the industrial sewing machine according to the invention of the reverse arm type comprises some traditional components, such as:
  • the members that move the needle and the original thread tensioning device are placed in the upper head and comprise a shaft connected to a motor, the rotation of which is converted, through eccentric, into alternating rectilinear motion, which is transferred to a needle holder support bar.
  • a thread tensioning device is normally arranged which, as can be seen in figures 8 and 9 , which refer to the state of the art, is represented, according to the traditional solutions, by a rigid plate 15, which works physically on a predefined position, even if it is slightly adjustable.
  • the traditional rigid plate 15 is provided with holes through which the threads are made to pass which reach the original thread tensioning device 13 and then the sewing needle of the upper head. It is therefore a solution that envisages a very distant position from the original thread tensioning device and a minimum very rigid adjustment during the formation of the stitch, as highlighted in the introduction with all the operating limits already mentioned.
  • an auxiliary device 16 for controlling the formation of the stitch and for compensating the tension of the upper sewing yarn is applied to the machine body, which passes between the two lower thread guides.
  • said auxiliary upper sewing yarn tension compensation device 16 comprises a plate 17 fixed parallel to a projection 18 being orthogonal with respect to the front surface of the machine, which is provided, in the upper end 17' thereof, with a first group of holes 19 and an appendage 20, arranged parallel to the plate 17, and in turn provided with a second group of holes 21 arranged in alignment with said first group of holes 19.
  • the holes 19 and 21 are crossed by the upper sewing yarns and represent the lower thread guides thereof.
  • an elastic compensation element represented by a flexible element 22, which has an elongated conformation, and is supported at the centre by a pin 23, with a preferably cylindrical section which, in this embodiment, can be represented by a spring.
  • said plate 17 is provided in the upper end 17' thereof of said first group of holes 19 and an appendage 20, arranged parallel to the plate 17, and in turn provided with a second group of holes 21 arranged in alignment with said first group of holes 19.
  • said elastic compensation element is represented by the elongated flexible element 22 which, in its central part, has a bunching supported by said pin 23 that causes a certain flexibility between the two half-parts that make up the body of the flexible element 22.
  • the half-part 22' turned towards the outside of the machine is inserted into a fixed part inside a block 24, while the opposite half-part 22" is free and able to intercept the path of the threads that pass through the holes 19 and 21 of the lower thread guides.
  • the threads 25 coming from the assemblies 11 for adjusting the tension of the upper sewing yarn are introduced by the operator through the first group of holes 19 of the plate 17, then made to pass above the flexible element 22, in particular at the free half-part 22" and then through the second group of holes 21 present on the said appendage 20.
  • the sewing yarns at the exit from the holes 21 of the lower thread guide 20, are channelled through further holes 26 afforded on an appendage 27 of the upper thread guide which is placed on an extension 28 of the plate 17, in a position such as to reach the original thread tensioning device 13 positioned on the upper sewing head 12.
  • extension 28 of the plate 17 is hinged onto a pin 29 and can rotate angularly through the intervention of a pneumatic cylinder (not shown in the figures) whose stem acts on another pin located in the lower part of the extension 28.
  • the passage of the threads 25 through the holes 19 and 21 while they are made to pass over the flexible elements 22, causes the ideal condition so that the threads themselves are always maintained in a controlled and compensated work tension, i.e. an ideal condition to obtain maximum quality sewing stitches, as the compensation assembly of the flexible element 22 causes the loosening or stiffening of the threads according to the operating conditions.
  • the flexible element 22 between the two lower thread guides has its working point adjustable to allow the auxiliary device to always find the perfect balance thereof between two sewing yarn construction factors, the elongation factor (elasticity) of the sewing yarn itself and the breaking load of the sewing yarn.
  • the working point of the upper thread guide 27 is variable as a function of the type of seam that the machine is to perform, whether it is inside or outside the material to be sewn. Such variability is caused by the pneumatic cylinder which acts on the extension 28 bearing the thread guide 26.
  • the ideal condition for controlling the formation of the stitch is that the upper thread guide 27 is placed close to the original thread tensioning device 13.
  • the working stitch of the upper thread guide 27 is positioned on the right-hand side of the original thread tensioning device 13.
  • the mechanical compensation device works in combination with the flexible element 22 for compensating for any differences in tension of the upper sewing yarn 26, which are due to the type of sewing yarn used (size and elasticity of the fibres) and the thickness of the material.
  • the upper thread guide 27 When it is in the working position, the upper thread guide 27 is normally almost aligned with the original thread tensioning device 13 present in the sewing machine, when the latter, during its oscillatory movement, is positioned in the upper apex point thereof.
  • the device according to the invention envisages the use of:
  • the original thread tensioning device allows the entire auxiliary device to be moved between two positions:
  • the auxiliary device according to the invention definitively enables the sewing machine to obtain a double chain seam, with stitch 400 or 401, having all the optimal characteristics required.
  • the auxiliary device When the auxiliary device is in the work position, it has the cylinder extended ( figure 3 ), the chain formed by the lower sewing yarn has a visual appearance with a very wide loop, and to touch it is soft and flat as there are no knots formed by the upper sewing yarn.
  • the loop of the chain is arranged on the back side of the material.
  • the flexible element placed in the auxiliary device, between the two lower threads, prevents any excessive tension being created during the mechanical action which potentially could break the upper sewing yarn.
  • Such flexible element is able to work with a different mechanical stroke on the basis of the length of the stitch performed by the sewing assembly and by the tension and elasticity of the yarn during use.
  • the advantages of the auxiliary device are therefore those related to the possibility to form the sewing stitch with minimum tension between the two sewing yarns, which can only happen using the flexible element 22 according to the invention.
  • a further advantage is offered by the possibility to maintain a flat and very elastic seam, also allowing elasticated materials to be sewn.

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

Claims (7)

  1. Machine à coudre industrielle (10) formée par un corps de machine du type à bras inversé, comprenant :
    - un ensemble de bobines (11) pour alimenter des fils à coudre supérieurs (25),
    - une tête supérieure (12) dans laquelle sont disposés une aiguille à coudre avec ses éléments de mouvement et un dispositif de tension du fil d'origine (13),
    - un système d'avancement (14) pour faire avancer un tissu sur une surface de travail sous laquelle est disposé un moyen boudeur qui, avec l'aiguille à coudre, contribue à la formation d'un point de couture,
    dans lequel, entre ledit ensemble de bobine (11) et ladite tête supérieure (12) dans laquelle l'aiguille à coudre est disposée, un dispositif auxiliaire (16) pour la compensation dynamique de la tension du fil à coudre est appliqué au corps de la machine, le dispositif auxiliaire ayant au moins deux positions pour commander la formation du point de couture et compenser la tension desdits fils à coudre supérieurs (25), ledit dispositif auxiliaire (16) comprenant des guide-fil inférieurs (17', 20) entre lesquels au moins un élément flexible (22) est interposé pour compenser la tension des fils et un guide-fil supérieur (27), moyennant quoi ledit dispositif auxiliaire (16) peut être ajusté angulairement sur un axe (29) pour amener ledit guide-fil supérieur (27) d'une position de travail à une position de repos par l'intermédiaire d'un vérin pneumatique,
    caractérisée en ce que ledit dispositif auxiliaire (16) comprend un moyen de support (17, 18) dont l'extrémité supérieure (17'), qui représente le premier guide-fil inférieur, est pourvue d'un premier groupe de trous (19) et d'un appendice (20), qui représente le second guide-fil inférieur, disposé parallèlement à la plaque de support (17) et pourvu à son tour d'un second groupe de trous (21) disposés en alignement avec ledit premier groupe de trous (19).
  2. Machine à coudre industrielle (10) selon la revendication 1, caractérisée en ce que ledit élément flexible (22) est allongé et disposé transversalement par rapport à l'avancement du fil à coudre entre ledit premier groupe de trous (19) et ledit second groupe de trous (21).
  3. Machine à coudre industrielle (10) selon la revendication 2, caractérisée en ce que ledit élément flexible allongé (22) a une section partiellement cylindrique, comprenant un ressort (23).
  4. Machine à coudre industrielle (10) selon l'une quelconque des revendications 2 à 3, caractérisée en ce que ledit élément flexible allongé (22) est disposé symétriquement dans une position relevée par rapport auxdits premier (19) et second (21) groupes de trous de sorte que le fil à coudre peut effectuer un trajet sensiblement en forme de V inversé, de manière à permettre audit élément flexible allongé (22) d'exercer sur le fil à coudre lui-même des relâchements ou des tensions élastiques respectifs contrôlés en fonction d'une étape de couture.
  5. Machine à coudre industrielle (10) selon la revendication 1, caractérisée en ce que lesdits guide-fil inférieurs (17', 20) sont situés sur une plaque de support (17) et sont reliés audit guide-fil supérieur (27) par une extension (28) de ladite plaque de support (17), et en ce que ledit guide-fil supérieur (27) est situé à proximité du dispositif de tension du fil d'origine (13) placé sur la tête supérieure (12).
  6. Machine à coudre industrielle (10) selon la revendication 5, caractérisée en ce que ladite plaque de support (17) comprenant l'extension (28) est articulée sur l'axe (29) pour tourner angulairement par l'intervention dudit vérin pneumatique dont la tige agit sur un autre axe situé dans l'extension (28), pour amener ledit guide-fil supérieur (27) de la position de travail à la position de repos.
  7. Machine à coudre industrielle (10) selon l'une quelconque des revendications précédentes caractérisée en ce que ledit dispositif auxiliaire (16) forme un levier mécanique entre trois points, définis par un triangle (33), ainsi défini :
    - un premier sommet (A) correspondant à une position supérieure, en hauteur, du dispositif de tension du fil d'origine (13) de la barre à aiguille ;
    - un deuxième sommet (B) correspondant à une position du guide-fil supérieur (27) ;
    - un troisième sommet (C) correspondant au guide-fil inférieur de la paire de guide-fil inférieurs (17', 20) placés sur l'élément flexible allongé (22).
EP20169729.9A 2019-04-16 2020-04-15 Machine à coudre industrielle Active EP3725929B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000005890A IT201900005890A1 (it) 2019-04-16 2019-04-16 Dispositivo di controllo del cucirino superiore per macchine da cucire industriali a braccio rovescio

Publications (2)

Publication Number Publication Date
EP3725929A1 EP3725929A1 (fr) 2020-10-21
EP3725929B1 true EP3725929B1 (fr) 2021-11-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20169729.9A Active EP3725929B1 (fr) 2019-04-16 2020-04-15 Machine à coudre industrielle

Country Status (2)

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EP (1) EP3725929B1 (fr)
IT (1) IT201900005890A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6029514B2 (ja) * 1977-03-11 1985-07-11 ブラザー工業株式会社 ボタン孔縢りミシンにおける上糸張力付与装置
JP2008245731A (ja) * 2007-03-29 2008-10-16 Juki Corp ミシン
DE102009048794A1 (de) * 2009-10-08 2011-04-14 CHEE SIANG INDUSTRIAL CO., LTD., Wugu Fadenabziehvorrichtung beim Starten des Nähvorgangs für eine Nähmaschine mit der Möglichkeit zum automatischen Fadenschneiden
JP2019017666A (ja) * 2017-07-14 2019-02-07 Juki株式会社 ミシン

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EP3725929A1 (fr) 2020-10-21
IT201900005890A1 (it) 2020-10-16

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