EP1321556B1 - Procédé et dispositif pour réguler le transport de l'ouvrage dans une machine à coudre ou à broder - Google Patents

Procédé et dispositif pour réguler le transport de l'ouvrage dans une machine à coudre ou à broder Download PDF

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Publication number
EP1321556B1
EP1321556B1 EP02405896A EP02405896A EP1321556B1 EP 1321556 B1 EP1321556 B1 EP 1321556B1 EP 02405896 A EP02405896 A EP 02405896A EP 02405896 A EP02405896 A EP 02405896A EP 1321556 B1 EP1321556 B1 EP 1321556B1
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EP
European Patent Office
Prior art keywords
sewing
sensor
actual
feed
sensors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02405896A
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German (de)
English (en)
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EP1321556A2 (fr
EP1321556A3 (fr
Inventor
Manfred Schweizer
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Fritz Gegauf AG
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Fritz Gegauf AG
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Publication date
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Publication of EP1321556A2 publication Critical patent/EP1321556A2/fr
Publication of EP1321556A3 publication Critical patent/EP1321556A3/fr
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Publication of EP1321556B1 publication Critical patent/EP1321556B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D05B27/14—Work-feeding means with rotary circular feed members rotating discontinuously
    • 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
    • D05B19/16—Control of workpiece movement, e.g. modulation of travel of feed dog
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/22—Work-feeding means with means for setting length of stitch

Definitions

  • the invention relates to a method for controlling the mass transfer in a sewing or embroidery machine according to the features of claim 1, and an apparatus for performing the method according to claim 6.
  • mass transfer devices In sewing or embroidery machines, the transport of the sewing material or fabric takes place after the execution of a sewing stitch by a mass transfer device.
  • mass transport devices are, for example, arranged below a throat plate feeders or drivable embroidery hoop.
  • Feeders may have one or more horizontal bars, which are formed on their side facing the fabric sawtooth. After the execution of each sewing stitch, that is, after the sewing needle is no longer in contact with the fabric, the feed dog performs one or more cyclic movements, whereby the fabric is transported by one or more pitches in the sewing direction. In this case, the feed dog is raised so far that the bars pass through slot-shaped openings in the throat plate and in contact with the Sewing material arrive. The fabric is pressed by a presser foot against the throat plate or against the passing through the needle plate beam. The feed dog then performs a sliding movement in the sewing direction, whereby the fabric is transported by one step in the sewing direction.
  • the feed dog lowers again so that the bars no longer protrude beyond the throat plate and returns to its original position.
  • the individual partial movements can be combined to form a continuous sequence of movements.
  • the sewing direction can be reversed by reversing the sequence of movements described above so that the new sewing direction runs counter to the original sewing direction.
  • sewing machine models in which the feed dog can perform in an analogous manner in addition to the sewing direction and transport movements vertically to the sewing direction, so that the fabric or the fabric is displaceable in two dimensions or in a predetermined by the surface of the needle plate stitching plane.
  • Such sewing machines can be used for embroidering small patterns.
  • an embroidery hoop can be used to embroider patterns.
  • an embroidery hoop drivable by two stepper motors is used, wherein the fabric or the sewing material in this hoop is clamped.
  • the embroidery frame is moved by means of the two stepper motors so that the new puncture site comes to rest under the sewing needle.
  • specified stitch widths and directions are maintained at the sewing level.
  • the actual stitch widths and directions may differ from those set on the machine or calculated by the machine control.
  • the actual material feed in one or two directions during the individual transport steps or cycles does not correspond to the required default values. Such deviations may be systemic or random.
  • Deviations of the actual actual stitch widths or actual feed widths from the respective desired stitch widths or setpoint feed widths of the mass transfer device can be, for example, from the sewing machine model or from the properties of the sewing material or of the fabric or from force effects on the sewing material during sewing or embroidering depend. In particular, the dependent on the sewing material slip during the transport process or different transport properties during forward and backward transport of the material are important. Deviations of the actual values from the target values can also occur when using Embroidery hoops, for example, when the fabric warps within the hoop.
  • a sewing machine with a device for measuring and controlling the feed size is known.
  • two spaced-apart, aligned with vertical to the sewing direction CCD sensors and each equipped with a light source line scan cameras are arranged.
  • the front in the sewing direction line scan camera is turned on at the beginning of the sewing process and generates a digitized instant image of a surface portion of the fabric. Once this surface section due to the feed speed on the rear in sewing direction Line scan camera should be, this is turned on and scans the fabric surface until the pattern correlates with the previously recorded by the front line camera pattern.
  • a disadvantage of this device is its sensitivity to displacements vertical to the sewing direction and against twists of the sewing material in the sewing plane.
  • the brightness of the light sources must be matched to the basic brightness of the material.
  • the sewing material must be advanced at least by the distance of the two line sensors until a value for the deviation of the actual feed speed of the sewing material from the desired feed speed can be determined.
  • the measuring and control device can detect such deviations only in one feed direction.
  • the actual feed rate must be less than the target feed rate. Both the determination of the feed rate and the material position are subject to measurement errors.
  • actual values of feed or step widths of a sewing material can be detected for each sewing step or each feed cycle. If the sensor used for detecting the feed or step widths has a sufficiently high sampling rate, then actual values of the feed movement or of the displacement of the material to be sewn may also take place during advancement, ie during the execution of sewing steps or feed cycles.
  • the actual step widths of the material to be sewn can be adapted to predetermined values of the desired step widths such that on average via one or more feed cycles the summed value of the actual step sizes coincides with the summed value of the desired step widths.
  • the control of the feed size can be done quickly and sensitively or sluggishly.
  • deviations of the actual feed from the set feed which are detected during the execution of a sewing step or feed cycle, can already occur in the same sewing step or in the subsequent sewing step or Feed cycle can be compensated.
  • the compensation in the following sewing step causes a relatively large difference between two successive step sizes. If the sensor used to detect the feed has a significantly higher sampling rate than the time required for the execution of the sewing step, the feed size can be controlled even during the execution of this sewing step. In this case, the actual values agree with the target values for each sewing step within the accuracy of the control.
  • This variant of the control of the feed size is particularly important in mass transfer systems whose drive is independent of the main drive of the needle bar.
  • the compensation of the deviation detected is distributed over several sewing steps or feed cycles, which results in only small differences between the individual stitch widths on average.
  • the method can be used to control the feed sizes in forward and / or backward movements of the material in one or two dimensions of the sewing plane.
  • deviations of the actual material advance detected in the sewing direction and in a transverse direction perpendicular to the sewing direction can be detected by the sensor.
  • sewing in sewing direction can be detected by the sensor deviations in sewing direction and / or in Transverse direction can be compensated by influencing the feed sizes in sewing direction and / or transverse direction.
  • the method according to the invention and the device according to the invention are suitable for controlling cyclically operating feed means coupled to the main drive for the needle bar.
  • the method and the device can also be used to control the mass transport in sewing direction and / or transverse direction with independent, not coupled to the main drive drives.
  • Such drives can be, for example, the stepper motors of an embroidery frame or electric motor roller drives.
  • FIG. 1 shows an exemplary embodiment of a household sewing machine according to the invention, in short a sewing machine 1, with a machine housing, called housing 3 for short, which comprises a forearm 5, a stand 7 and an upper arm 9 with a head part 11.
  • the housing 3 is partially cut in Figure 1, so that a machine control or controller 13 is partially visible inside.
  • a drive (not shown in Figure 1) drivable needle bar 15 for receiving and moving a sewing needle, also called needle 17, protrudes downwards from the head part 11 out.
  • a throat plate 21 Below the head part 11, an opening or a shaft 19 at the top of the forearm 5 is covered by a throat plate 21.
  • the top sides of the throat plate 21 and the lower arm 5 are arranged flush with each other and define an approximately vertical to the needle bar 15 lying adjacent plane N.
  • the throat plate 21 includes below the needle bar a slot-shaped needle insertion opening 23. On both sides of each is an elongated, approximately rectangular feed gate opening 25 in the Throat plate 21 inserted. The three openings are not connected and have approximately the shape of the big letter "H".
  • the two fabric slide openings 25 define with their longitudinal extent a sewing direction y.
  • the longitudinal extent of the needle insertion opening 23 extends in a direction transverse to the sewing direction y transverse direction x.
  • the sensor opening 31 could also be located in front of or next to the needle insertion opening 23, but it should be arranged in the environment or in the region of the needle insertion opening 23 that it is still within the effective range of the mass transfer device 27. That is, the fabric feed effected by the mass transport device 27 can be detected by a sensor 32 mounted in or below the sensor opening 31 without substantial errors.
  • multiple sensors 32 may be used independently or in combination with each other for this purpose.
  • the sensor opening 31 may be round or have any other shape, for example rectangular or oval. It may also include a plurality of partial openings, for example, mutually parallel slot openings.
  • the sensor or sensors 32 are designed to resolve a measured variable in at least one spatial dimension.
  • the measured variable is preferably an optical pattern or the optical structure of the material to be sewn 28.
  • a sensor 32 for example in the form of a position sensor 33 as parallel to the sewing direction (y) aligned CCD line or as a CCD matrix (50) or as Microcamera with a lens 34 (Fig. 2) and be formed with an image processing unit for detecting and processing a one- or two-dimensional image area.
  • other spatially resolving sensors 32 may be used, for example, use ultrasound, radar waves or other methods for position, position or speed detection of the material 28.
  • the position sensor 33 is inserted into the shaft 19 such that a protective window 36 (FIG. 2) mounted in front of the lens 34 terminates the sensor opening 31 flush.
  • the material to be sewn 28 can optionally be pressed against the needle plate 21 and / or the protective window by a sliding shoe or roller 38 (FIG. 3) in the region of the protective window 36 from the side of the head part 11.
  • the with slight pressure of a spring 40 can be pressed against the fabric 28 sliding shoe or scooter 38, for example, be attached to a support rod of a presser foot 42. It can be brought in this embodiment together with the presser foot 42 for the sewing in contact with the fabric 28 and then raised again.
  • the shoe or scooter 38 ensures that the strokes of the feed dog 29 do not cause any errors in the detection of feed values by the sensor 32.
  • sensors 32 operating with other technology and / or a plurality of sensors 32 may also be inserted into the sensor opening 31, for example Motion sensors or speed sensors.
  • suitable transmission or connection means for transmitting the measured variable or quantities to be detected to the sensor or sensors 32 in the sensor opening 31 on the needle plate 21 may be used, for example a bundle of optical fibers, an optimized lens system and / or an array of mirrors and / or prisms 44 ( Figure 4).
  • a roller pair with at least one electrically drivable first roller 46 (FIG.
  • FIG. 6 shows the sewing machine 1 from FIG. 1 with an attached embroidery module 35.
  • the embroidery module 35 comprises an embroidery frame 37 for clamping and holding the Sewing material 28 and one of two (not shown) stepper motors driven positioning or moving device 39 for moving the embroidery frame 37 in or against the two directions x and y of the sewing plane N.
  • the embroidery frame 37 is fixed to a frame holder 30, which along a first arm 43 of the moving device 39 is movable in the y direction. This first arm 43 in turn is movable along a second arm 45 of the moving device 39 in the x direction.
  • the sewing material 28 is clamped in the embroidery frame 37 so that it rests on the sewing plane N.
  • FIG. 2 shows a longitudinal section through the throat plate 21 in the sewing direction y in the region of the position sensor 33.
  • the protective window 36 is, for example, a scratch-resistant sapphire crystal or made of a hard, transparent plastic.
  • the lens 34 and a substrate 41 arranged thereunder, for example a printed circuit board, as a carrier of a two-dimensional CCD matrix 50 and a light source 52, for example an LED, are held in a sensor housing 47.
  • the position sensor 33, in particular the substrate 41 with the CCD matrix 50 and the light source 52 are connected to a sensor electronics 49, which may include a processor of, for example, more than 10 MHz clock rate and can perform digital image processing algorithms.
  • FIG. 7 shows a plan view of the throat plate 21 with sewing material 28 resting thereon in the sewing direction y during the sewing process.
  • the stitch width or the spacing of the puncture sites 51 of the sewing stitches in the sewing material 28 is equal to a first actual increment ⁇ y B of the fabric feed by the feed dog 29 in the sewing direction y per feed cycle, because after every fabric feed Cycle, one sewing stitch at a time.
  • the actual stock feed or the first actual increment in the sewing direction y is ⁇ y B in each case. It is also possible for the first actual increment ⁇ y B of the fabric feed in the sewing direction y to be changed during the sewing process by the user of the sewing machine 1 or by the controller 13.
  • a material feed both in and out allow y against the direction of sewing the first target increments .DELTA.y A and the first actual step sizes .DELTA.y B can assume both positive and negative values.
  • the input or specification of a default value or a first set increment ⁇ y A for the material feed in the sewing direction y is shown on the controller 13.
  • a default value can be done for example by users of the sewing machine 1 by means of a scale wheel or menu-controlled via a touch screen.
  • the controller 13 may also calculate such default values for first target step sizes ⁇ y A , in particular taking account of user inputs.
  • the first thrust variable ⁇ y T which is also shown symbolically in FIG. 8, corresponds to the advancing movement of the mass transfer device 27 acting on the sewing material 28, in particular the feed dog 29.
  • the first thrust variable ⁇ y T can assume negative or positive values, depending on whether a movement is backwards or done in the forward direction y.
  • the values of the first thrust quantity ⁇ y T and the first actual increment ⁇ y B correspond to the value of the first set increment ⁇ y A.
  • the first thrust variable ⁇ y T is slightly larger than the first set increment ⁇ y A , because a certain slip of the material to be sewn 28 is expected during each transport step got to. It is thereby achieved that the first actual step size ⁇ y B for an average sewing material 28 approximately corresponds to the value of the first set step size ⁇ y A.
  • the fabric transporting device 27 is designed such that the sewing material 28 is movable in addition to the sewing direction y in a transverse direction x oriented in the sewing plane N and oriented vertically to the sewing direction y.
  • FIG. 9 shows a plan view of the needle plate 21 with material to be sewn on it during the sewing process with feed movements in the sewing direction y and in the transverse direction x.
  • the feed dog 29 can also perform a transport movement in the transverse direction x.
  • the feed dog 29 lead due to a second target increment ⁇ x A respectively a transport or Feed cycle with a second thrust size ⁇ x T in the transverse direction x.
  • FIG. 10 shows the cyclical movement of a bar of the presser foot 29 for such a transport cycle.
  • the second thrust quantity ⁇ x T is longer and the dimensions of the beam are shown smaller than they actually are in relation to the lifting movement. Possible positions of the bar during a transport cycle are dotted.
  • the sewing material 28 is in each case moved by a second actual step width ⁇ x B in the transverse direction x.
  • ⁇ x A , ⁇ x T and ⁇ x B can assume positive and negative values, which corresponds to movements in and against the transverse direction x.
  • the relative coordinates in units of the respective first actual step widths ⁇ y B in the sewing direction y and the respective second actual step widths ⁇ x B in the transverse direction x are indicated between the individual punctured sites 51 a - 51 e.
  • the associated individual feed cycles of the feed dog 29 in the sewing direction y and in the transverse direction x can be carried out successively one after the other. Alternatively, a part of the feed cycles to be executed between two puncture sites 51 can also take place simultaneously as a combined movement in the sewing direction y and transverse direction x.
  • the transport of the material 28 is no longer via the feed dog 29, but by means of the stepper motors by the moving device 39.
  • the first thrust variable ⁇ y T minimal the value of the step size of the stepping motor acting in the sewing direction y.
  • the second thrust quantity ⁇ x T minimally has the value of the step size of the stepping motor acting in the transverse direction x. If these step sizes are very small, that is, for example less than 0.1 mm, a multiple of these step sizes can also be defined as the first thrust quantity ⁇ y T or as the second thrust variable ⁇ x T and stored, for example, in a nonvolatile memory of the controller 13 or of the embroidery module 35.
  • the first thrust quantities ⁇ y T and the second thrust magnitudes ⁇ x T can also be redefined for each stitch to be executed, for example as values of the stitch width in the sewing direction y and in the transverse direction x.
  • the actual step sizes ⁇ y B , ⁇ x B may deviate from the associated desired step sizes ⁇ y A , ⁇ x A.
  • Reasons for this for example, different transport properties in Depending on the sewing material 28, the sewing position within the sewing material 28 or the transport direction. Forces which act on the sewing material 28 during the sewing process and wear phenomena on the sewing machine 1 are further possible causes for changing transport properties. As can be seen from the schematic diagram in FIG.
  • the first thrust variable ⁇ y T or the second thrust variable ⁇ x T is determined as a function of the first actual step width ⁇ y B detected by the position sensor 33 of the actual material feed in the sewing direction y or the second actual step size ⁇ x B regulated in the transverse direction x.
  • a region of the sewing material 28 lying over the protective window 36 (FIG. 2) which for example has the dimensions 5 mm ⁇ 5 mm, is illuminated by the light source 52 and imaged onto the CCD matrix 50 via the lens 34.
  • the sensor electronics 49 which includes a digital image processing unit, called IPS (Image Processing System) or DSP (Digital Signal Processor)
  • the position sensor 33 can detect and process 1500 images per second, for example.
  • the position sensor 33 is able to detect the smallest structures or structural differences as well as their position in the captured image detail on the basis of intensity differences within the captured image detail. Due to the change in position characteristic irregularities in the surface structure of the material to be sewn 28 and / or due to the change in position of color samples of the material 28 in directly successive and / or temporally further spaced image captures, the IPS of the position sensor 33 determines relative displacements of the material 28 in the sewing direction y and in the transverse direction x and the corresponding feed rates. By considering a plurality of image recordings with at least one common feature, resolution and accuracy of the position sensor 33 can be further improved.
  • the displacements or changes in position of the material to be sewn 28 by the sensor electronics 49 starting from the x and y coordinates of a zero or start value at the beginning of the sewing process, summed and as absolute x and y coordinates of the position or position values in relation provided to the starting value as an output signal.
  • the controller 13 reads in each case the actual feeding values of the sewing material 28 in the x and y directions with respect to the starting value determined by the IPS and stores them in a memory of the controller 13 Alternatively, if the sensor 32 has a sufficiently high temporal sampling rate, the feed values can also be transmitted and stored to the controller 13 during the material feed, for example, periodically at equal or changing intervals.
  • a sewing step which is characterized by two consecutive pinholes, can therefore be decomposed in any desired manner into individual desired step sizes, for which the actual actual step widths are then determined by the sensor 32.
  • the controller 13 calculates the associated actual material feed, ie the first actual increment ⁇ y B or the second actual increment ⁇ x B.
  • the zero or start value for each sewing step or feed cycle, or a multiple thereof may be redefined again and again.
  • the value transferred by the IPS to the controller 13 is in this case directly the first actual increment ⁇ y B or the second actual increment ⁇ x B, and the subtraction is omitted.
  • the controller 13 now determines the deviation of the associated first setpoint increment ⁇ y A from the determined first actual increment ⁇ y B and stores this value as the first correction value D y .
  • the control of the second thrust variable ⁇ x T is controlled by the second thrust variable ⁇ x T.
  • the controller 13 can correct detected deviations in the first thrust quantities ⁇ y T or the second thrust variables ⁇ x T very quickly within only one advancing or sewing step.
  • the individual desired step sizes within a sewing step can be set arbitrarily, so that a control of the thrust quantities ⁇ y T , ⁇ x T can even take place within a single sewing step.
  • other known control algorithms for controlling the thrust quantities ⁇ y T , ⁇ x T can be used, in which a compensation and a correction of errors over several feed or sewing steps. As a result, larger differences between the stitches of two consecutive stitches as well as unwanted feedback or oscillations of the sewing needle can be avoided.
  • stepper motors The setting or regulation of the thrust quantities ⁇ y T , ⁇ x T via stepper motors.
  • the step motors act directly or indirectly on a (non-shown) actuator for adjusting the respective sizes Dy thrust T, T Ax.
  • the thrust variables ⁇ y T , ⁇ x T of these stepper motors are adapted directly.
  • the sensor 32 can also be used for optical recognition of embroidery frames when its edge is above the sensor 32. This way, an embroidery frame coding can be easily replaced to recognize different frame types and sizes.

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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 (11)

  1. Procédé pour régler le transport du tissu sur une machine à coudre ou à broder (1), comprenant au moins un dispositif de transport du tissu (27) pour transporter l'article à coudre (28) dans au moins une direction avec chaque fois un pas de progression de consigne (ΔyA ; ΔxA), le pas de progression de consigne (ΔyA ; ΔxA) étant réglable ou pouvant être calculé par une commande (13) et influençant au moins une distance d'avance (ΔyT ; ΔxT) du dispositif de transport du tissu (27) pour transporter l'article à coudre (28), caractérisé en ce qu'au moins un pas de progression réel (ΔyB ; ΔxB) est relevé par au moins un capteur (32), et en ce que la commande (13) règle la distance d'avance (ΔyT ; ΔxT) en fonction des pas de progression réels (ΔyB ; ΔxB) de telle sorte que les écarts entre les pas de progression réels (ΔyB ; ΔxB) et les pas de progression de consigne (ΔyA ; ΔxA) correspondants s'équilibrent au moyen d'un ou de plusieurs pas de couture ou cycles d'avance successifs.
  2. Procédé selon la revendication 1, le dispositif de transport du tissu (27) étant conçu pour transporter l'article à coudre (28) dans une direction (y) avec chaque fois des premiers pas de progression de consigne (ΔyA) et dans une direction transversale (x) avec chaque fois des seconds pas de progression (ΔxA), et le premier pas de progression de consigne (ΔyA) et le second pas de progression de consigne (ΔxA) étant réglables ou pouvant être calculés par une commande (13) et influençant une première distance d'avance (ΔyT) et une seconde distance d'avance (ΔxT) du dispositif de transport du tissu (27) pour transporter l'article à coudre (28) dans la direction de couture (y) et dans la direction transversale (x), caractérisé en ce que le premier pas de progression réel (ΔyB) et le second pas de progression réel (ΔxB) sont relevés par le ou les capteurs (32), et en ce que la commande (13) règle la première distance d'avance (ΔyT) et la seconde distance d'avance (ΔxT) en fonction de premiers pas de progression réels (ΔyB) et de seconds pas de progression réels (ΔxB) de telle sorte que les écarts entre les premiers et les seconds pas de progression réels (respectivement ΔyB et ΔxB) et les pas de progression de consigne (ΔyA ; ΔxA) correspondants s'équilibrent au moyen d'un ou de plusieurs pas de couture ou cycles d'avance successifs.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la commande (13) enregistre sous forme de données les signaux des capteurs de façon périodique ou au rythme d'un ou de plusieurs cycles d'avance ou pas de couture et établit le premier pas de progression réel (ΔyB) et/ou le second pas de progression réel (ΔxB) ou les vitesses d'avance correspondantes.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que des premiers pas de progression réels (ΔyB) et/ou des seconds pas de progression réels (ΔxB) et/ou des écarts entre ces pas de progression réels (ΔyB; ΔxB) et les pas de progression de consigne (ΔyA; ΔxA) correspondants sont enregistrés dans une mémoire ou additionnés.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'un écart fortuit ou dû au système entre le premier pas de progression réel (ΔyB) et/ou le second pas de progression réel (ΔxB) et le pas de progression de consigne (ΔyA; ΔxA) correspondant, qui est relevé par le ou les capteurs (32), est compensé par un ou plusieurs pas de couture ou cycles d'avance en modifiant ou en réglant les distances d'avances associées (ΔyT ; ΔxT) de telle manière que les écarts s'annulent mutuellement au moyen d'un ou de plusieurs pas de couture ou cycles d'avance.
  6. Dispositif pour mettre en oeuvre le procédé selon l'une des revendications 1 à 5, caractérisé en ce que le ou les capteurs (32) sont conçus pour résoudre une grandeur de mesure dans au moins une dimension spatiale.
  7. Dispositif selon la revendication 6, caractérisé en ce que le ou les capteurs (32) comprend une ligne d'un dispositif à transfert de charge (CCD) orientée parallèlement à la direction de couture (y) ou une matrice à transfert de charge (CCD) (50) ou bien encore une microcaméra équipée d'une unité de traitement de l'image pour saisir et traiter une zone d'image uni ou bidimensionnelle.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que le ou les capteurs (32) ou moyens de connexion associés au(x) capteur(s) (32) sont disposés au moins en partie dans un compartiment (19), sous une plaque à aiguille (21) de la machine à coudre ou à broder (1).
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé en ce qu'une ouverture de capteur (33) est ménagée dans la plaque à aiguille (21) dans la zone d'une ouverture (23) dans laquelle pique l'aiguille, en ce que cette ouverture de capteur (33) est recouverte par une fenêtre protectrice (36), et en ce que le ou les capteurs (32) ou les moyens de connexion avec le ou les capteurs (32) sont au moins partiellement placés sous ladite fenêtre protectrice (36).
  10. Dispositif selon la revendication 9, caractérisé en ce que, dans la zone de la fenêtre protectrice (36), l'article à coudre (28) peut être appliqué contre la plaque à aiguille (21) ou la fenêtre protectrice (36) par un patin de glissement ou un galet (38).
  11. Dispositif selon la revendication 9 ou 10, caractérisé en ce qu'une source de lumière (52) est disposée sous la fenêtre protectrice (36).
EP02405896A 2001-12-19 2002-10-21 Procédé et dispositif pour réguler le transport de l'ouvrage dans une machine à coudre ou à broder Expired - Lifetime EP1321556B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH23172001 2001-12-19
CH23172001 2001-12-19

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EP1321556A2 EP1321556A2 (fr) 2003-06-25
EP1321556A3 EP1321556A3 (fr) 2004-12-15
EP1321556B1 true EP1321556B1 (fr) 2006-01-04

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US (2) US6871606B2 (fr)
EP (1) EP1321556B1 (fr)
AT (1) ATE315120T1 (fr)
DE (1) DE50205513D1 (fr)

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US20030131773A1 (en) 2003-07-17
US6871606B2 (en) 2005-03-29
US6994042B2 (en) 2006-02-07
EP1321556A2 (fr) 2003-06-25
DE50205513D1 (de) 2006-03-30
US20050115482A1 (en) 2005-06-02
EP1321556A3 (fr) 2004-12-15
ATE315120T1 (de) 2006-02-15

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