EP0157942B1 - Dispositif sur machine à coudre pour maintenir constante la distance entre le boucleur et l'aiguille quand celle-ci fléchit latéralement - Google Patents

Dispositif sur machine à coudre pour maintenir constante la distance entre le boucleur et l'aiguille quand celle-ci fléchit latéralement Download PDF

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Publication number
EP0157942B1
EP0157942B1 EP84116121A EP84116121A EP0157942B1 EP 0157942 B1 EP0157942 B1 EP 0157942B1 EP 84116121 A EP84116121 A EP 84116121A EP 84116121 A EP84116121 A EP 84116121A EP 0157942 B1 EP0157942 B1 EP 0157942B1
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EP
European Patent Office
Prior art keywords
needle
gripper
sewn
holder
plane
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
Application number
EP84116121A
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German (de)
English (en)
Other versions
EP0157942A1 (fr
Inventor
Klaus Dipl.-Ing. Stutznäcker
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.)
Naehmaschinenfabrik Emil Stutznaecker GmbH and Co KG
Original Assignee
Naehmaschinenfabrik Emil Stutznaecker GmbH and Co KG
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 Naehmaschinenfabrik Emil Stutznaecker GmbH and Co KG filed Critical Naehmaschinenfabrik Emil Stutznaecker GmbH and Co KG
Publication of EP0157942A1 publication Critical patent/EP0157942A1/fr
Application granted granted Critical
Publication of EP0157942B1 publication Critical patent/EP0157942B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B11/00—Machines for sewing quilts or mattresses

Definitions

  • the invention relates to a method for operating a sewing machine, in particular a multi-needle sewing machine, the material being conveyed being conveyed in any direction within the material level.
  • the needle is slightly deflected or bent during the insertion of the sewing material if the sewing material is moved in any direction within the sewing material plane during the insertion of the needle. This deflection or bending of the needle depends on how great the displacement process is while the needle is in the material to be sewn, how stable the needle is and finally how rigid or elastic the material is.
  • sewing machines are known in which the needle makes a defined movement together with the material to be sewn, namely so-called needle transport machines. However, they only allow the material to be transported or conveyed in one direction, namely in the direction that runs parallel to the plane in which the hook is pivoted. Sewing machines are also known in which both the needle and the gripper make a defined movement, which is derived from one or more cams. These are so-called zigzag or decorative stitching machines. In this case too, the sewing material is only conveyed in the direction that runs parallel to the plane in which the hook is rotated or pivoted.
  • the invention is based on the object of creating a working method on a sewing machine by means of which sewing disturbances, such as thread tearing, skipped stitches, caused by the movement of the sewing material and the deflection of the needle caused thereby, are avoided and the sewing properties, in particular sewing safety, are substantially increased will.
  • the object is achieved according to the invention in that the gripper and / or needle holder is moved in dependence on the needle bending caused by the conveyed sewing material in such a way that the distance between the needle and the plane of movement of the gripper remains essentially the same.
  • the invention is based on the knowledge that the commercially available needles have such great elasticity that they are relatively small anyway Withstand deflections and bends easily over very long operating times without the needles breaking.
  • the elasticity of the sewing needle is used in such a way that small displacements of the sewing material during the time
  • the needle in which the needle is in the material to be sewn does not cause injuries to the material to be sewn, precisely because the needle can bend elastically by this amount of the small displacement, that is, it moves with the material.
  • the invention also relates to a device for carrying out the working method on a sewing machine, in particular on a multi-needle sewing machine, in which a drive is provided for conveying the sewing material in any direction within the sewing material plane, and furthermore, the gripper and needle are each attached to a movable holder.
  • the device according to the invention is characterized in that a further drive acts on the gripper and / or needle holder, which is designed and controlled in such a way that the gripper and / or needle is dependent on the needle bending caused by the conveyed sewing material Holder is moved so that the distance between the needle and the plane of movement of the hook remains essentially the same.
  • Fig. 1 shows a perspective view for reasons of better clarity, a very simplified multi-needle sewing machine 1, in the present case a multi-needle double chain stitch machine, with a fixed base frame 1a and a U-shaped frame on both sides that can be pushed back and forth in the transverse direction Housing parts 1b, 1c and a crosshead 1d connecting them together.
  • the back and forth movement in the direction of the double arrow x is carried out by the electric feed motor 6, which engages with a gear 7 on a rack 8.
  • the rack 8 engages on a slide known per se with a deflection roller 5.
  • This controlled back and forth conveying of the sewing material in the transverse direction x serves, in conjunction with a controlled longitudinal conveying y, any pattern on the sewing material 4, z.
  • Fig. 2 illustrates a partial vertical cross section through the needle plate 3, on which the material 4 rests.
  • the needle plate 3 is provided with a needle hole 9 for each needle 10, which in practice can also be slightly larger in diameter than shown in the drawing.
  • the upper shaft 11 of the needle is connected to a needle holder (not shown). This sits on a needle carrier or needle bar common to all the other needles of the same row, which is moved up and down during sewing, so that the needle 10, as shown, penetrates the sewing material 4 and the stitch hole 9.
  • a thread loop 12 of the upper thread carried by the needle forms.
  • the tip 13 of a gripper 14 or a gripper hook engages in this thread loop.
  • the hook 14 is connected to a hook holder 15 which, in the case of a multi-needle sewing machine, is fastened together with other hooks of the same row on a shaft 16, which executes a reciprocating movement in the direction of the arrow 17 during sewing, so that the hook 14 performs a pivoting movement in a plane perpendicular to the plane of the drawing according to FIGS. 2 to 4.
  • the distance between the needle 10 on the one hand and the swivel plane of the gripper 14 adjacent to the needle is identified by the reference symbol a.
  • This position of the needle 10 and the gripper 14 relative to one another according to FIG. 2 results when the sewing material 2 either stands still or is conveyed in the direction perpendicular to the plane of the drawing.
  • the position of the needle 10 can each by a fixed sensor 18, for. B. can be measured exactly by an induction or Hall sensor.
  • the needle 10 will move to a certain extent bent out on the left. This bending of the needle is drawn in Fig. 3 for better clarity because of very exaggerated. It should also be noted that in practice the needle is not bent in the lower part below the guide plate 3, but within the material 4 and in the area directly above the material. In any case, however, which is important here, the needle is bent so that the distance from the hook 14 is increased, so that the hook tip no longer engages with safety in the needle loop 12.
  • a drive which engages the gripper holder and which is designed and controlled in such a way that the gripper holder is displaced depending on the needle bending caused by the conveyed sewing material, so that the distance a between the needle and the plane of movement of the gripper 14 remains essentially the same.
  • the gripper 14 is shifted by a certain amount in the direction of the arrow 20.
  • a corresponding shift of the needle holder can also be carried out, but then by analogy a corresponding dimension in FIG. 3 takes place to the right in order to bring about the essentially constant distance a despite the bending of the needle 10 to the left. Under certain circumstances, it is also conceivable to move both the gripper holder and the needle holder against one another.
  • the displacement of the hook holders or gripper or the hook tips on the one hand and / or the needle holders and needles on the other hand can be economically easily achieved, in particular in multi-needle sewing machines, because often hundreds and more hooks or hooks are attached to a shaft and needles to a beam. Even if several parallel rows of needles and loops are provided in a multi-needle sewing machine, the needle holders of the individual rows and also the looper holders of the corresponding rows are e.g. B. connected to each other by means of a frame, so that only one drive for moving all gripper holders and grippers and / or all needle holders and needles is then required.
  • a further advantageous inventive idea for the design of the drive device is that the drive for the displacement of the gripper and / or needle holder is controlled as a function of the control commands for the direction and speed of the sewing material. Since these controls, especially for pattern sewing machines, are usually electronic coordinate controls, you can, as I said, their control commands for the direction and speed of the sewing material transversely to the plane of movement of the gripper or grippers to control the displacement of the or use the hook and / or needle holders.
  • An electric or electrohydraulic servo system is expediently provided for controlling the drive, which is designed in such a way that it generates a displacement of the gripper and / or needle holder proportional to the measured values.
  • the measured values can also be obtained in that a sensor, for example an induction or Hall sensor, is arranged at a distance from at least one needle and perpendicular to the plane of the pivoting movement of the gripper in question, for measuring the degree of needle bending. It is generally sufficient to measure the needle deflection of only a single needle at the relevant time of sewing or at a specific seam, because it can be assumed that all other needles experience the same deflection at the relevant time of measurement. In this context, it should also be mentioned that the control of the drive does not generally have to cause a change in position of the hook and / or needle holders for every needle stitch of the many needles in a multi-needle sewing machine. If e.g.
  • the shift position of the hook and / or needle holders remains unchanged as long as a straight piece of the diagonal check seam is sewn.
  • the hook and / or needle holders are only shifted accordingly at the corner points of the diagonal check seam.
  • FIG. 5 shows a perspective view and a simplified representation of an exemplary embodiment of a drive for displacing a common shaft 16 for numerous grippers 14, and in this case the drive essentially consists of a lifting magnet 23.
  • FIG. 6 shows an associated functional diagram. Then the electrical voltage of the feed motor 6 or a tachogenerator voltage derived therefrom, preferably fed to the electromagnet or lifting magnet 23 via an amplifier 24, the movable core of which in the direction of the arrow, in cooperation with a return spring 25, generates an adjusting force and brings about the adjustment explained above.
  • FIG. 7 illustrates the diagram of a further exemplary embodiment of a drive, specifically an electric servomotor 26 or adjusting motor is provided as the drive, which can be driven via an amplifier 27 by the differential voltage of two electrical voltages, namely on the one hand a first voltage of the feed motor explained above 6 or a tachogenerator voltage derived therefrom and, on the other hand, a second voltage which can be controlled by a potentiometer 28.
  • the potentiometer is directly coupled to the electric servo motor 26 or adjusting motor.
  • the feed motor 6 serves, as stated above, for the conveyance of the sewing material in the transverse direction or perpendicular to the plane of the pivoting movement of the gripper (s).
  • the electric servo motor 26 or adjusting motor acts on the gripper or needle holder, as described above, specifically in accordance with FIG. 7, for example with the interposition of a component 29 which is seated on a spindle 30 driven by the servo motor 26.
  • the mode of operation is therefore that the voltage in the feed motor or on a tachometer generator is compared with a second voltage, the difference between the two voltages being used to drive the servo motor 26 or adjusting motor via the amplifier 27 until the difference between the two Voltages 0 results.
  • the second voltage is controlled by a potentiometer 28, which in turn is directly coupled to the servomotor or adjusting motor 26.
  • FIG. 8 illustrates a diagram of a further embodiment of the drive, specifically the drive is designed as a double-acting pneumatic or hydraulic cylinder 31, in which a displaceable piston 32 is provided.
  • the piston rod 33 of the piston 32 is connected to the gripper or needle holder explained above.
  • the cylinder spaces on both sides of the piston 32 are acted upon by an electro-hydraulic servo valve 34.
  • the servo valve 34 is influenced on the one hand by an electromagnet 35 with the interposition of a spring 36 and on the other hand by a return spring 37. Similar to the previously described exemplary embodiments according to FIGS.
  • the speed and direction of the conveyance of the sewing material on the corresponding feed motor 6 can also be measured directly in this exemplary embodiment, specifically in the form of the electrical voltage or by measuring a pulse frequency when using a pulse generator or by measuring the voltage on a tachometer generator. If one takes the voltage off the feed motor or the tachogenerator, then the voltage may possibly only need to be guided to the electromagnetic servo valve described, with the aid of the amplifier 38, namely to the electromagnet 35 of this servo valve 34, so that the servo valve corresponds to the adjacent one Tension opens more or less.
  • the downstream pneumatic or hydraulic cylinder 31 will be able to exert more or less great force corresponding to the opening of the servo valve, which force is transmitted via the piston rod 33 of the piston 32 and leads to a defined displacement.
  • FIG. 9 illustrates a further exemplary embodiment, namely a double-acting pneumatic or hydraulic cylinder 39 with a piston 40 displaceable therein is provided as the drive.
  • the piston rod 41 of the piston is connected to the conveying device of the sewing material in such a way that the displacement paths of the sewing material are transmitted in a direction perpendicular to the plane of the pivoting movement of the hook.
  • the cylinder spaces on both sides of the piston 40 are connected to one another with the interposition of a throttle device 42.
  • the cylinder 39 is connected on the one hand by means of a spring 43 to a fixed part 44 of the machine frame and on the other hand to the gripper or needle holder, as indicated by the double-sided arrow.
  • the displacement of the respective gripper and / or needle holder can be carried out very precisely in accordance with the degree of bending of the needle or needles.

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

Claims (15)

1. Procédé pour faire fonctionner une machine à coudre, notamment une machine à coudre à nombreuses aiguilles, où la matière à coudre est transportée dans des directions quelconques à l'intérieur de son plan, caractérisé en ce que le support de navette et/ou le support d'aiguille est déplacé en translation, en fonction de l'incurvation d'aiguille produite par la matière à coudre transportée, de telle sorte que l'espacement entre l'aiguille et le plan de mouvement de la navette reste sensiblement constant.
2. Procédé selon la revendication 1, caractérisé en ce que la course de translation du support de navette et/ou du support d'aiguille est commandée en fonction de la vitesse de transport de la matière à coudre.
3. Procédé selon la revendication 1, caractérisé en ce que la course de translation du support de navette et/ou du support d'aiguille est commandée en fonction des ordres de commande de la direction de la vitesse de transport de la matière à coudre.
4. Procédé selon une des revendications précédentes, caractérisé en ce que l'incurvation d'aiguille est mesurée sur au moins une aiguille par un capteur.
5. Procédé selon la revendication 2, caractérisé en ce que la vitesse de transport de la matière à coudre est mesurée dans une zone angulaire perpendiculairement au plan de mouvement de la navette, et en ce que la translation du support de navette et/ou du support d'aiguille est effectuée proportionnellement aux valeurs de mesure.
6. Dispositif pour la mise en oeuvre du procédé selon la revendication 1 dans une machine à coudre, notamment dans une machine à coudre à nombreuses aiguilles, la machine à coudre comportant un entraînement pour assurer le transport de la matière à coudre dans des directions quelconques à l'intérieur de son plan, tandis qu'il est en outre prévu des navettes et des aiguilles qui sont respectivement fixées sur un support mobile entraîné pour la formation des points, caractérisé par un autre entraînement agissant sur le support de navette et/ou le support d'aiguille et qui est agencé et commandé de telle sorte que, en fonction de l'incurvation d'aiguille provoquée par la matière à coudre transportée, le support de navette et/ou le support d'aiguille est déplacé en translation d'une manière telle que l'espacement entre l'aiguille et le plan de mouvement de la navette reste sensiblement constant.
7. Dispositif selon la revendication 6, caractérisé en ce que l'entraînement assurant la translation du support de navette et/ou du support d'aiguille est commandé en fonction de la vitesse de transport de la matière à coudre.
8. Dispositif selon la revendication 6, caractérisé en ce que l'entraînement assurant la translation du support de navette et/ou du support d'aiguille est commandé en fonction des ordres de commande pour le transport de la matière à coudre perpendiculairement au plan de mouvement de la navette.
9. Dispositif selon la revendication 6, caractérisé en ce qu'un capteur servant à mesurer le degré d'incurvation d'aiguille est disposé à distance d'au moins une aiguille et perpendiculairement au plan du mouvement de pivotement de la navette.
10. Dispositif selon une des revendications 6 à 9, caractérisé en ce que, pour la commande de l'entraînement, il est prévu un servo-système électrique ou électro-hydraulique qui est agencé de telle sorte qu'il produise une translation, proportionnelle aux valeurs de mesure, du support de navette et/ou du support d'aiguille.
11. Dispositif selon la revendication 6, caractérisé en ce que, comme entraînement, il est prévu un électro-aimant pourvu d'un ressort de rappel et auquel est appliquée, le cas échéant avec interposition d'un amplificateur, la tension électrique d'un moteur d'avance ou bien une tension de tachy-génératrice dérivée de celui-ci, ce moteur d'avance étant prévu pour le transport de la matière à coudre dans la direction transversale ou bien perpendiculairement au plan du mouvement de pivotement de la navette, et en ce que l'électro-aimant est relié au support de navette ou au support d'aiguille.
12. Dispositif selon la revendication 6, caractérisé en ce que, comme entraînement, il est prévu un cylindre pneumatique ou hydraulique à double effet comportant un piston pouvant coulisser dans celui-ci, en ce que la tige du piston est reliée au support de navette ou au support d'aiguille, en ce que les volumes définis dans le cylindre des deux côtés du piston sont sollicités par une servo-valve électro-hydraulique sur laquelle agit un ressort de rappel et en ce qu'à la servo-valve est appliquée la tension électrique d'un moteur d'avance ou d'une tension de tachy-génératrice dérivée de celui-ci, ce moteur d'avance étant prévu pour le transport de la matière à coudre dans la direction transversale ou bien perpendiculaire au plan du mouvement de la navette.
13. Dispositif selon la revendication 6, caractérisé en ce que, comme entraînement, il est prévu un servo-moteur électrique ou un moteur de manoeuvre, qui peut être excité, par l'intermédiaire d'un amplificateur, par la tension différentielle entre deux tensions électriques, notamment, d'une part, une première tension d'un moteur d'avance ou bien une tension de tachy-génératrice dérivée de celui-ci et, d'autre part, une seconde tension pouvant être commandée par un potentiomètre, en ce que le potentipmètre est couplé directement avec le servo-moteur électrique ou le moteur de manoeuvre, le moteur d'avance étant prévu pour le transport de la matière à coudre dans la direction transversale ou bien perpendiculairement au plan du mouvement de pivotement de la navette, et en ce que le servo-moteur électrique ou le moteur de manoeuvre agit sur le support de navette ou le support d'aiguille.
14. Dispositif selon la revendication 6, caractérisé en ce que, comme entraînement, il est prévu
un cylindre pneumatique ou hydraulique à double effet, comportant un piston pouvant coulisser dans celui-ci, en ce que la tige du piston est reliée au dispositif de transport de la matière à coudre de telle sorte que les courses de translation de la matière à coudre soient transmises dans une direction perpendiculaire au plan du mouvement de pivotement de la navette, en ce que les volumes définis dans le cylindre des deux côtés du piston sont reliés entre eux avec interposition d'un dispositif d'étranglement, et en ce que le cylindre est relié, d'une part, au moyen d'un ressort avec une partie fixe du bâti de la machine et, d'autre part, avec le support de navette ou le support d'aiguille.
EP84116121A 1984-01-05 1984-12-21 Dispositif sur machine à coudre pour maintenir constante la distance entre le boucleur et l'aiguille quand celle-ci fléchit latéralement Expired EP0157942B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843400206 DE3400206A1 (de) 1984-01-05 1984-01-05 Verfahren zum betrieb einer naehmaschine, insbesondere einer vielnadelnaehmaschine, sowie vorrichtung zur durchfuehrung des verfahrens
DE3400206 1984-01-05

Publications (2)

Publication Number Publication Date
EP0157942A1 EP0157942A1 (fr) 1985-10-16
EP0157942B1 true EP0157942B1 (fr) 1988-06-01

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EP84116121A Expired EP0157942B1 (fr) 1984-01-05 1984-12-21 Dispositif sur machine à coudre pour maintenir constante la distance entre le boucleur et l'aiguille quand celle-ci fléchit latéralement

Country Status (3)

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US (1) US4597344A (fr)
EP (1) EP0157942B1 (fr)
DE (1) DE3400206A1 (fr)

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Publication number Priority date Publication date Assignee Title
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CN110004598B (zh) * 2019-04-12 2021-06-11 航天材料及工艺研究所 一种分离式锁式线迹缝制装置及缝制方法

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Publication number Publication date
DE3400206A1 (de) 1985-07-18
US4597344A (en) 1986-07-01
EP0157942A1 (fr) 1985-10-16
DE3400206C2 (fr) 1987-01-08

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