EP2944716B1 - Dispositif et procédé destinés à influencer la situation de noeuds entre des fils supérieurs et des fils inférieurs lors de la couture au moyen d'une machine à coudre - Google Patents

Dispositif et procédé destinés à influencer la situation de noeuds entre des fils supérieurs et des fils inférieurs lors de la couture au moyen d'une machine à coudre Download PDF

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Publication number
EP2944716B1
EP2944716B1 EP15405032.2A EP15405032A EP2944716B1 EP 2944716 B1 EP2944716 B1 EP 2944716B1 EP 15405032 A EP15405032 A EP 15405032A EP 2944716 B1 EP2944716 B1 EP 2944716B1
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EP
European Patent Office
Prior art keywords
sewing
thread
stitch
value
actuator
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EP15405032.2A
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German (de)
English (en)
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EP2944716A1 (fr
Inventor
Severin Brunner
Alain Capt
Gunnar Schlaich
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BERNINA International AG
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BERNINA International AG
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D05B19/02—Sewing machines having electronic memory or microprocessor control unit
    • D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
    • 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
    • D05B49/00—Take-up devices, e.g. levers, for the needle thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B63/00—Devices associated with the loop-taker thread, e.g. for tensioning

Definitions

  • the invention relates to a device and a method for influencing the position of knots between upper thread and lower thread when sewing with a sewing machine according to the preamble of claims 1 and 7.
  • the upper thread and the lower thread are connected or intertwined or knotted at each insertion point of the sewing needle into the sewing material.
  • the term "sewing machine” includes in particular household sewing machines and overlock sewing machines.
  • the position of each node or each junction of upper and lower thread relative to the respective associated puncture site in the fabric is dependent on the yarn tensions of the upper thread and the lower thread or their temporal course in the knot formation. This concerns in particular the last phase of the knot formation, wherein the upper thread is stretched in the last section of the upward movement of the sewing needle by a thread lever which is arranged between the sewing needle and a thread tensioner.
  • the thread tensioner usually includes two with adjustable force gegenrgicpressbare thread tension discs, between which the upper thread is passed. Due to the increased thread tension of the upper thread, on the one hand, the knot is tightened and, on the other hand, a defined amount of upper thread is pulled off the thread bobbin. If the thread tension or tensile force of the upper thread changes relative to that of the lower thread or vice versa, the position of the node at the respective puncture site also changes relative to a neutral center position within the sewing material. The larger the upper thread tension, the farther away from the middle layer in the direction of the upper side of the sewing material, the knot comes to rest. Conversely, the knot can be drawn at a lower upper thread tension in an analogous manner to the underside of the fabric or even come to rest on the underside of the fabric and be moved to the adjacent puncture site of the sewing needle.
  • a thread tension regulator is known in which the thread tensioner or the force exerted by the thread tensioner on the thread transversely to the pulling direction pressing force is adjustable by means of an electromagnet.
  • the desired value for the desired compressive force can be specified.
  • the relationship between the driving current of the electromagnet and the resultant pressing force is known. However, this relationship or function may differ from the known reference relationship in other sewing machines. For each sewing machine, therefore, a correction value is detected and stored, with which either the input set value for the pressing force of the thread tensioner or the value of the drive current for the electromagnet are corrected so that the resulting pressing force of the thread tensioner corresponds to the set target value regardless of the respective sewing machine.
  • the actual knot ply in sewing usually has at least one or more parameters such as type and thickness of the fabric, friction coefficient and tension of the lower thread and the upper thread, knot type, needle bar pivot position, stitch length and stitch width or amount, direction and speed of change the stitch position between successive Nähstichen, sewing machine type, environmental conditions such as humidity and temperature and the like dependent is, the results are often not satisfactory with a fixed specifiable setting of the thread tensioner.
  • the dependence of the knot catching on the pivoting position of the needle bar can cause the knots to be pulled optimally into the middle of the stitching at the puncture points on the one side, whereas those on the other side are not.
  • EP1460160 A1 discloses a sewing machine with a controllable and controllable thread tensioning device.
  • an electromagnet acts on a friction brake with two clamping disks.
  • the thread tensioning device can be operated in a control mode that allows frequent change of thread tension after every few stitches.
  • the thread tensioning device influences the tension of the upper thread in such a way that the knots between the lower thread and the upper thread lie, as far as possible, in the sewing material or between two superimposed workpiece parts.
  • the thread tension required for an optimal knot position in the sewing material depends on the speed of the drive. In a learning process empirically suitable drive currents for the actuator are determined for two different speeds or support points.
  • the coil current of the electromagnet and thus also the thread tension of the upper thread are controlled as a function of the speed. Values for speeds between the interpolation points lie, are determined by linear interpolation.
  • WO99 / 58752 discloses an apparatus and method for automatically adjusting the upper thread tension during sewing with a sewing machine. Before starting the sewing process, the thread tension is set to a reference value.
  • the reference value can be specified as a machine-specific value for each sewing machine.
  • the required thread length is specified for successive stitches.
  • the actually used length of the upper thread is measured with a sensor. This measurand serves as a feedback variable for controlling the thread tensioner. Based on the actually used thread length, the control checks whether the force exerted by the thread tensioner on the thread causes the desired upper thread length or the desired thread length ratio. The braking force exerted by the thread tensioning device on the upper thread is adjusted in subsequent stitches, taking into account information from previous stitches, so that the actual length corresponds to the desired length.
  • An object of the present invention is to provide a device and a method for a sewing machine, which in a simple way allow an improved control of the knot layer when executing one or more successive stitches.
  • the device comprises a thread tensioning device with an actuator which is operatively connected to the upper thread or the lower thread and is designed to influence the tensile or tension force acting on the respective thread at least during knot formation.
  • the actuator is preferably designed for directly influencing or controlling a braking force when tightening the nodes.
  • the braking force when tightening the knots could also be indirectly influenced by controlling or controlling the length of a portion of the upper thread and / or the lower thread usable in knotting.
  • the actuator for conveying one of the threads may be formed in and / or counter to the thread direction.
  • the resultant force which the upper thread and the lower thread exert on the knot at knot formation is preferably controlled by only one actuator which selectively acts on the upper thread or the lower thread. This allows a simple and space-saving design. Compared to two or more actuators acting on both the lower thread and the upper thread, controlling a single actuator is easier.
  • the guide value for the actuator can be set individually by the control of the sewing machine a) for each stitch to be formed or b) for each definable group to be formed consecutive stitches.
  • the controller comprises a calculation unit which is designed to a) for each stitch or b) for each defined group of successive stitches at least one predetermined or predefinable reference value for the reference variable of the actuator together with at least one parameter value influencing the node position during sewing to a reference variable for the actor, such that a) the deviation of the position of the nodes from a predetermined or predefinable target position for each node is as low as possible; or b) the average deviation of the position of the nodes in each group of nodes from one for each node predetermined or predetermined target position is as low as possible.
  • the nominal position refers to one at each node Reference position at the associated puncture site in the sewing material. This reference position is preferably in the middle between the two surfaces of the fabric to be sewn.
  • the nominal position of each node comprises a component in the piercing direction of the sewing needle or transversely or orthogonally to the fabric and a component parallel to the lower or upper surface of the fabric.
  • the direction parallel to the surface comprises a component in the direction of the next following and / or a component in the direction of the immediately preceding puncture site and thus by the feed component of the sewing material in the sewing direction and by the pivot component of the sewing needle transverse to the sewing direction relative to the subsequent and / or previous stitch influenced.
  • the nominal position of a node can be specified at least approximately by a positive or negative length that represents the thread length between the reference point and the desired nodal position, wherein the sign indicates whether the node is above or below the reference point.
  • the processing instructions stored in the calculation unit are based on information about how one or more parameter values or changes in such parameter values affect the location of the nodes, and what correction of the reference variable is required so that during sewing a) the deviation of the position of each node from the associated desired position is minimal or b) for groups of stitches the average deviation of the node layers from the associated desired positions is minimal.
  • the processing instructions can be specified so that each node is fed into the material as close as possible to the associated neutral central position.
  • knots can be formed between successive puncture sites in different layers with respect to the respective puncture site at the top or bottom of the fabric. If the upper thread and the lower thread have different colors, visible patterns can be produced in this way.
  • the sewing machine control can limit the sewing speed as a function of the actuating time required by the actuator. This can ensure that the period between the execution of successive stitches is always sufficiently large to fully set with the actuator, the control variable or the braking force of the thread tensioner for influencing the thread tension at each stitch, at least at the node formation to the desired value.
  • the sewing machine control can temporarily correct the values of the reference variable for the actuator, in particular at greater sewing speeds, so that the positioning times are shorter or at most the same size as the respective stitch periods. In favor of a higher maximum sewing speed, the accuracy of the stitch feed can be reduced within a tolerable measure.
  • Another possibility is to group several consecutive stitches together and determine a common leader value for each of these groups, for example such that the average deviation of the common leader value from the optimal leader values in each group is minimal.
  • the manipulated variable of the actuator must be changed less frequently in this case. Also in this case, the maximum possible sewing speed is increased at the expense of the accuracy of the node layers.
  • the sewing machine may comprise one or more sensors for detecting the upper thread tension and / or the lower thread tension or for detecting equivalent measured quantities.
  • the sewing machine may comprise one or more sensors for detecting the upper thread tension and / or the lower thread tension or for detecting equivalent measured quantities.
  • a voltage value representative of the node indentation is processed further.
  • the measured quantities of such sensors can be used to determine one or more reference values in an initialization process of the sewing machine and / or characteristic quantities which characterize the influence of the values of one or more parameters on the nodal position.
  • the measurements of these sensors are not used for real-time control of the thread tension to a predetermined value.
  • sensors of an external measuring device or measuring device that is not formed on the sewing machine can also be used for such initialization processes.
  • the reference values typical for the sewing machine are stored non-volatile in a memory of the sewing machine.
  • the calculation of the guide value for the actuator takes place on the basis of at least one stored or adjustable reference value. This is in a calculation unit of the controller together with at least one other parameter, the node position during sewing influenced, further processed to a leader value for the actuator.
  • a reference value for the actuator which, when sewing a fabric under predetermined reference conditions, causes the knots to be drawn into a reference position midway between the top and the bottom of the fabric at the respective stitching points of the sewing needle become.
  • Reference conditions Line seam with a mean reference stitch length with a reference thread on a reference stock at a specified reference sewing speed and with a mean reference pivot position of the needle bar).
  • a parameter that influences the nodal position during sewing is, for example, the change in the pivot position of the needle bar relative to the preceding stitch or the amount and direction of the position of the puncture site relative to the preceding puncture site.
  • a correction function is suitably stored in a memory of the controller. This correction function indicates a correction value for the reference variable or for the reference value as a function of the change in the pivot position of the needle bar relative to the pivot position at the preceding puncture site.
  • processing instructions of the calculation unit of the controller may also take into account other or additional parameters which influence the position of the nodes, for example speeds and / or accelerations of the needle bar and / or the thread lever.
  • the memory of the sewing machine control can also store a plurality of reference values which are dependent on one or more parameters, such as e.g. Stitch length, stitch width or pivot position of the needle bar are dependent.
  • the processing instructions for calculating the guide values for the actuator can be simplified and processed faster.
  • the calculation unit can each select one or more of these reference values which are optimal under the given conditions.
  • the calculation unit determines the optimum guide value for the actuator for each sewing stitch to be executed and controls the actuator with this guide value as the reference variable.
  • the stitch width and the stitch length for the sewing stitch to be currently executed or equivalent values are provided by the control of the sewing machine and the associated guide value is selected or calculated.
  • the processing instructions of the calculation unit may include further method steps with which dependencies of the nodal position can be additionally taken into account by further parameters.
  • a correction value or correction factor dependent on the pivoting direction of the needle bar relative to the preceding sewing stitch and / or on the sewing speed can be provided, with which the calculated guide value is specified.
  • the processing instructions for calculating correction values for optimizing the reference variable for the actuator can also take into account the temporal development or sequence of values of one or more parameters.
  • one or more values of a parameter for the current sewing stitch, for one or more immediately preceding sewing stitches and / or for one or more immediately following sewing stitches may be stored rolling in a memory. This means that the values are updated for each stitch to be executed.
  • the parameter values of the current sewing stitch, the immediately following sewing stitch and two immediately preceding sewing stitches are preferably taken into account. From these four parameter values, a preferably weighted mean value can be formed, which is then used instead of the current parameter value in the calculation of optimized reference value for the actuator.
  • correction values can also be calculated for each of the four parameter values, from which subsequently a preferably weighted mean value is calculated as a correction value for the reference variable.
  • the sewing machine preferably comprises a user interface with operating elements with which further parameters, such as the friction coefficient of a Threads can be selected or adjusted.
  • groups of sewing stitches may be defined via the user interface, for example by specifying a number of stitches or a stitch pattern with a number of stitches which are grouped together.
  • Default values can also be defined via the user interface, which specify the nodal position relative to an associated reference position in the sewing stitches.
  • the range of values for these default values is between -1 and +1, with the nodal layer at a value of -1 at the bottom of the fabric at or near the puncture site of the previous sewing stitch, and at a value of +1 at the top of the fabric Sewing material at or near the puncture site of the following sewing stitch.
  • such default values can be set individually, for example, by setting them for each individual stitch by the controls or by automatically selecting them by selecting a preferably scalable curve pattern.
  • Such curve patterns may be stored in a memory of the sewing machine control or processing unit, for example as linear arrays having values between -1 and +1 for each stitch of the group of stitches.
  • such stored Patterns are edited and / or additional patterns are saved.
  • the calculation unit controls the actuator synchronized with the cyclic movement of the needle bar with the successive guide values of the selected or active group. Without additional specifications, this sequence is repeated periodically during sewing.
  • the calculation unit can be made via the user interface further instructions on how the activation of the actuator should be influenced during sewing.
  • Such presets include, for example, scaling or normalization factors that influence the leaders in a group or rules for juxtaposing multiple equal or different sets of leaders.
  • FIG. 1 schematically shows a sewing machine 1 with a stand 2, at the bottom of a lower arm 3 and spaced above a top arm 5 protrude laterally.
  • the outer end region of the upper arm 5 is designed as a machine head 7.
  • a needle bar 9 protrudes with a sewing needle 11 inserted interchangeably therein.
  • Needle bar 9 is movable up and down to perform sewing stitches in the direction of needle bar axis A (double arrow A ') and for performing zigzag stitches about a pivot axis B transversely to sewing direction N or longitudinally of upper arm 5 pivotally in the machine head 7 stored (double arrow B ').
  • a throat plate 13 is arranged on the upper side of the lower arm 3.
  • the node position L 1 relative to the predetermined reference position L 0 at this puncture site By influencing or controlling the braking force of the thread tensioner 23 and / or the lower thread tensioner 33 at least during the phase of the knot tightening by the thread lever 27, the node position L 1 relative to the predetermined reference position L 0 at this puncture site to be influenced.
  • the final node position L 1 is thereby shifted to the top of the fabric 15.
  • the final nodal position L 1 is shifted with lower braking force of the thread tensioner 23 to the bottom of the fabric 15.
  • the course of the resulting force F AR and the final node position L 1 are also dependent on the feed of the Nähguts 15 in the sewing direction N and the pivoting movement B
  • FIGS. 3 to 5 schematically show a cross section of the material 15 during the straight stitching.
  • the manipulated value of the thread tensioner 23 is shown in FIG FIG. 3 set so that the final node position L 1 corresponds to the reference node position L 0 .
  • the final node position L1, L1 ', L1 "does not only have reference to the associated reference position L0, L0', L0" a component in the vertical direction or in the piercing direction of the sewing needle 11, but also a horizontal component in the direction of the next insertion point of the sewing needle 11.
  • the knot layer L 1 on the top side of the sewing material 15 can be influenced by the braking force of the thread tensioner 23 at least during the tightening of the knot 31.
  • the setting value for the thread tensioner 23 is set or controlled by the actuator 39, for example, by a stepper motor, a s Servomotor or an electromagnet.
  • the node position L 1 can be set or controlled by the actuator 39 at the bottom of the material 15.
  • the actuator 39 is controlled by a command value output from the controller 35 of the sewing machine 1.
  • the value of this reference variable is calculated individually by the calculation unit 37 for each stitch or at least for each group of two or more stitches and provided for the activation of the actuator 39.
  • FIG. 6 shows by way of example a schematic diagram of a sewing machine 1 with elements of a thread tensioning device, which can be used to control the node layers L 1 when sewing with a sewing machine 1.
  • the control system 35 comprises a calculation unit 37 with a program memory 38 and a reference memory 36.
  • the sewing machine 1 can be configured and controlled via a user interface 41 with control elements 43 and preferably with a graphical display device 45.
  • the specification of the sewing speed via a foot control 47, which is in operative connection with the controller 35.
  • the controller 35 is in operative connection with the main motor 49, which serves as a drive for the cyclical Ab-on-movement of the needle bar 9 during sewing. Further movements that take place synchronously with the cyclical movement of the needle bar 9, for example, the movement of the feed dog 51 for advancing the sewing material 13 in the sewing direction N, the movement of the gripper 53 for looping the upper thread 21 about the lower thread 17 during the execution of a stitch and the pendulum movement of the thread lever 27 are also driven by the main motor 49 in the rule.
  • the controller 35 is operatively connected to other actuators for adjusting sewing parameters, in particular, an actuator 55a for controlling the pivotal position of the needle bar 9 and an actuator 55b for controlling the thrust component of the conveyor 51 in the sewing direction N.
  • the reference value memory 36 stores at least one reference value for the reference variable.
  • This reference value corresponds to a value of the reference variable with which the actuator 39 must be controlled in order to cause at predetermined reference conditions in the execution of a sewing stitch that the actual position L 1 of the node 31 corresponds to a predetermined reference position L 0 .
  • This reference value is preferably determined individually for each sewing machine 1 in an initialization process and stored non-volatilely in the reference size memory 36. Alternatively, the reference value can also be specified as a function of a specific type of sewing machine.
  • a plurality of reference values can also be stored in the reference value memory 36, which correspond to an optimized value of the reference variable for the actuator 39 for different reference conditions.
  • the reference conditions may differ by different values of one or more parameters.
  • reference values for different stitch widths can be stored in the reference size memory 36 under otherwise identical conditions.
  • a two-dimensional array of reference variables depending on the stitch length and the stitch width may be stored in the reference size memory 36.
  • reference variables can also be stored in the reference value memory 36 for additional or other combinations of parameters.
  • values can also be stored in the reference-size memory 36 as a function of the pivoting direction of the needle bar 9 relative to the preceding stitch and / or values as a function of the pivotal position of the needle bar 9.
  • the reference values stored in this way are information carriers for how the command variable for the actuator 39 must be selected as a function of one or more parameters the position L 1 of the knot 31 when sewing as well as possible corresponds to a predetermined reference position L 0 .
  • the calculation unit 37 has available as input variables 58 values of several parameters which influence the node position L 1 during sewing. Such parameters are, in particular, the pivoting position of the needle bar 9 and the material feed in the sewing direction N between the preceding and the current sewing stitch to be executed.
  • values for one or more stitches may be temporarily stored temporarily in a memory of the calculation unit 37 and used for calculating the reference variable.
  • the calculation unit 37 can determine the direction and the amount of pivoting movement of the needle bar 9 from the difference in the pivotal position of the needle bar 9 between the preceding and the current stitch. These quantities are also parameters of which the node position L 1 is dependent during sewing.
  • the reference value (s) together with at least one parameter value influencing the nodal position L 1 during sewing are processed into a reference variable for the actuator 39.
  • the processing instructions comprise information on how the node position L 1 changes as a function of one or more parameters or how the command variable for the actuator 39 has to be adjusted on the basis of one of the stored reference values as a function of one or more parameters, so that the node position L 1 at Sewing as well as possible corresponds to the reference node position L 0 .
  • Such dependencies can be stored in the program memory 38, for example, as functions, the values of the reference variable preferably being specified for interpolation points which are arranged uniformly distributed over the value range of the respective parameter. If only a few nodes are provided, intervening values can be interpolated.
  • information for calculating optimized drive values for the actuator 39 may be stored as reference quantities in the reference memory 36 and / or as processing instructions in the program memory 38.
  • a desired operating mode can be specified or selected.
  • the indent will be on each Sewing stitch optimized so that the position L 1 of the node 31 of the neutral center position or the reference position L 0 corresponds.
  • the desired position L 1 for the node 31 can be specified differently from the reference position L 0 .
  • groups with multiple stitches can be defined in which the node position L 1 is adjusted individually for each stitch according to selected specifications.
  • FIG. 7 12 schematically shows a plan view of a fabric 15, in which the layers L 1 of the knots 31 between the lower thread 17 shown by a thin line and the upper thread 21 shown by a thicker line when sewing a zig-zag seam along a curve on the upper side of the fabric are arranged.
  • the values of the reference value calculated for an optimal stitch insertion were adjusted with correction values for generating the curved curve shape, at the insertion points on the left side or every second
  • the puncture site is the correction value zero, so that there corresponds to the actual node position L 1 'of the desired position or the reference position L 0 ' In the puncture sites on the right side, however, the actual positions L 1 ", L 1 offset to the associated reference positions L 0 "L 0 at the desired location of the Nähgutoberseite.
  • the actuator 39 has been from the controller 35 with the for each Sewing stitch controlled individually adjusted values of the reference variable.
  • the reference variable can also be varied in the case of the sewing stitches on the left side, the knots 31 also being arranged there displaced to the top or bottom side of the sewing material 15.
  • calculation unit 35 can also monitor the positioning times of the actuator 39 and limit the sewing speed predetermined by the foot control 47, such that the positioning times are always shorter than the duration of the stitch cycles.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (9)

  1. Dispositif pour le contrôle de la position de noeuds (31) entre des fils supérieurs (21) et des fils inférieurs (17) lors de la couture d'un objet à coudre (15) avec une machine à coudre (1), comprenant un dispositif de tension de fils avec un actionneur (39), la force de traction FAR résultante exercée sur le noeud (31) par le fil supérieur (21) et le fil inférieur (17) lors du serrage du noeud (31) pouvant être influencée par cet actionneur (39), caractérisé en ce que la valeur de guidage est spécifiable individuellement par une unité de calcul (37) de la machine à coudre (1) pour l'actionneur (39) pour chaque point de couture ou pour chaque groupe de plusieurs points de couture successifs, en ce que l'unité de calcul (37) comprend une mémoire de programme (38) et une mémoire de valeurs de référence (36), la mémoire de programme (38) comprenant des prescriptions de traitement pour le traitement d'au moins une valeur de référence mémorisée dans le mémoire de valeurs de référence (36), pour la valeur de guidage de l'actionneur (39), et de valeurs de plusieurs valeurs d'entrée (58), dont la position de noeud L1 dépend lors de la couture, à une valeur de guidage pour la commande de l'actionneur (39), et en ce que chacune des valeurs d'entrée (58) comprend une valeur d'un des paramètres suivants, laquelle est valide à l'instant de la formation du point de couture actuel ou d'un point de couture précédent ou d'un point de couture ultérieur : position d'articulation de la barre à aiguille (9), largeur de point, longueur de point, valeur et/ou direction de la modification de la position d'articulation de la barre à aiguille (9) par rapport à la position d'articulation lors de l'exécution du point précédent, vitesse de couture ou valeur de contrôle de la pédale (47).
  2. Dispositif selon la revendication 1, un tendeur de fil (23) agissant comme frein à friction pour le fil supérieur (21) et un levier de fil (27) formé pour le serrage du fil supérieur (21) étant disposés, avec action successive, entre un point d'appui pour le réservoir de fil supérieur (21') et la barre à aiguille (9) dans la direction de serrage du fil supérieur (21), caractérisé en ce que la force de freinage du tendeur de fil (23) est réglable ou commandable par l'actionneur (39).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la valeur de référence enregistrée est une valeur pour la valeur de réglage de l'actionneur (39), laquelle a pour effet de maintenir minime l'écart de la position de noeud L1", L1', L1 lors de la couture par rapport à une position de référence spécifiée L0", L0', L0 dans des conditions de référence spécifiées avec une valeur spécifiée de l'au moins un paramètre de la valeur d'entrée.
  4. Dispositif selon la revendication 3, caractérisé en ce qu'une valeur prescrite est spécifiable pour la position de noeud L1", L1', L1 par rapport à la position de référence L0", L0', L0, pour chaque point de couture devant être formé.
  5. Dispositif selon la revendication 4, caractérisé en ce que plusieurs points de couture successifs peuvent être rassemblés en groupes, et en ce que, pour chaque point de couture au sein d'un tel groupe de points de couture, une valeur prescrite est spécifiable pour sa position de noeud L1", L1', L1 par rapport à la position de référence L0", L0', L0.
  6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce qu'un appareil pour la limitation de la vitesse maximale autorisée est prévue en fonction du temps de réglage de l'actionneur (39).
  7. Procédé pour influencer la position de noeuds (31) entre le fil supérieur (23) et le fil inférieur (17) lors de la couture avec une machine à coudre (1) avec un dispositif selon l'une des revendications 1 à 6,
    a) pour chaque emplacement de piqûre, la position de noeud dépendant des valeurs de plusieurs paramètres, par rapport à une position de référence spécifiée L0", L0', L0,
    b) des conditions de référence étant spécifiées, pour lesquelles ces paramètres ont des valeurs spécifiées,
    et
    c) pour plusieurs d'entre ces conditions de référence, des valeurs de référence correspondantes étant définies, lesquelles, en tant que valeur de guidage pour l'actionneur lors de la couture dans les conditions de référence respectives, ont pour effet de rentrer les noeuds dans la position de référence spécifiée respective L0", L0', L0 aux emplacements de piqûre de l'aiguille de couture, caractérisé en ce que,
    pour chaque point de couture devant être exécuté ou pour chaque groupe de points de couture successifs défini, une valeur de guidage pour la commande de l'actionneur (39) est déterminée de façon individuelle en fonction de plusieurs paramètres, des valeurs de ces paramètres étant enregistrées, et
    i) une valeur de référence mémorisée correspondante étant sélectionnée comme valeur de guidage pour ces valeurs enregistrées, ou
    ii) la valeur de guidage étant calculée à partir d'une des valeurs de référence mémorisées au moyen de fonctions mémorisées, lesquelles représentent les dépendances de la valeur de référence d'un ou plusieurs paramètres.
  8. Procédé selon la revendication 7, caractérisé en ce qu'une position prescrite L1", L1', L1 est spécifiée par rapport à chaque position de référence respective L0", L0', L0 pour chaque point de couture devant être exécuté, et en ce que la valeur de guidage sélectionnée ou calculée est ajustée pour chaque point de couture devant être exécuté, par une valeur de correction correspondant à la position prescrite respective L1", Lt', L1.
  9. Procédé selon l'une des revendications 7 ou 8, caractérisé en ce que l'actionneur (39) est commandé de façon coordonnée avec le mouvement de la barre à aiguille (9) au moins pendant le serrage du noeud (31) avec la valeur de la valeur de guidage sélectionnée ou calculée et, le cas échéant, ajustée, lors de l'exécution de chaque point de couture.
EP15405032.2A 2014-05-16 2015-04-20 Dispositif et procédé destinés à influencer la situation de noeuds entre des fils supérieurs et des fils inférieurs lors de la couture au moyen d'une machine à coudre Active EP2944716B1 (fr)

Applications Claiming Priority (1)

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CH00750/14A CH709666A1 (de) 2014-05-16 2014-05-16 Vorrichtung und Verfahren zum Beeinflussen der Lage von Knoten zwischen Oberfaden und Unterfaden beim Nähen mit einer Nähmaschine.

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JP6187410B2 (ja) * 2014-08-04 2017-08-30 豊田合成株式会社 ステッチラインの形成方法
KR20170139409A (ko) * 2016-06-09 2017-12-19 주식회사 마이크로코어 지그재그 재봉용 수직전회전북통, 이 수직전회전북통에 의해 만들어진 스티치 및 스티치제조방법
CN113089200B (zh) * 2021-04-08 2022-06-21 上海富山精密机械科技有限公司 一种智能线张力平衡装置及缝纫机

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JP6577234B2 (ja) 2019-09-18
CH709666A1 (de) 2015-11-30
US9631305B2 (en) 2017-04-25
US20150330005A1 (en) 2015-11-19
EP2944716A1 (fr) 2015-11-18
JP2015217305A (ja) 2015-12-07

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