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EP1811073A2 - Machine à coudre et procédé de detection de mouvement dans des machines à coudre - Google Patents

Machine à coudre et procédé de detection de mouvement dans des machines à coudre Download PDF

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Publication number
EP1811073A2
EP1811073A2 EP06405469A EP06405469A EP1811073A2 EP 1811073 A2 EP1811073 A2 EP 1811073A2 EP 06405469 A EP06405469 A EP 06405469A EP 06405469 A EP06405469 A EP 06405469A EP 1811073 A2 EP1811073 A2 EP 1811073A2
Authority
EP
European Patent Office
Prior art keywords
light
sewing machine
detected
sewing
light source
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.)
Withdrawn
Application number
EP06405469A
Other languages
German (de)
English (en)
Inventor
Michael Wentkowski
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.)
BERNINA International AG
Original Assignee
BERNINA International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BERNINA International AG filed Critical BERNINA International AG
Publication of EP1811073A2 publication Critical patent/EP1811073A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/02—Devices for determining or indicating the length of thread still on the bobbin
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
    • D05C11/08—Thread-tensioning arrangements
    • D05C11/14—Stop motions responsive to thread tension or breakage

Definitions

  • the invention relates to a sewing machine and a method for detecting movements in a sewing machine according to the features of claims 1 and 8.
  • Sewing machines, embroidery machines, quilting devices and the like often include sensors with which, for example, movements of the sewing material or the embroidery frame can be detected. By further processing the signals of such sensors, for example, control signals can be generated or displays can be activated.
  • control signals can be generated or displays can be activated.
  • a method for controlling the mass transfer in a sewing or embroidery machine in which a sensor for detecting feed widths of the sewing material in the throat plate is arranged.
  • the sensor is designed as a CCD camera and captures images of the surface of the material in rapid succession. Based on the position or position change of structural features of the fabric surface in successive images, a controller calculates the position and position of the sewing material or information about its movement.
  • the transport device for the fabric is influenced in such a way that such deviations are minimal.
  • a device for controlling the needle movement in a sewing machine comprises a detection device with an image sensor which detects a section of the fabric surface from above at a high scanning rate. When quilting the material is moved manually. The detection device detects in rapid succession of about 1500 images per second located in the region of the sensor and the sewing needle section of the fabric surface. Based on this information, the movements of the material are determined and the needle drive controlled in such a way that successive stitches are formed at equal intervals. Despite high sampling rate can occur in such systems, for example, at high accelerations errors.
  • Object movements can only be detected in a collection level, but not vertically.
  • a further object of the invention is to design the detection device and the method such that object movements in a plane and / or vertically to this plane can be detected.
  • the method according to the invention and the sewing, embroidery or quilting machine with the detection device according to the invention are based on the consideration that the calculation of object speeds or of position or position changes of objects by evaluating temporally successive individual images in particular reaches the limits of technical feasibility, if the objects are small and / or the Speeds or accelerations are large or if the object movements do not occur within a predetermined detection level.
  • movements are detected directly, that is to say without conversion from images of the object surface acquired temporally one after the other.
  • a laser generates a coherent light beam, which is directed by means of optics or by means of optical elements in the direction of the object surface to be detected.
  • the optics are designed so that light scattered on the object is collected and irradiated back to the laser. There, at least part of the scattered light enters through the partially transmissive mirror again into the resonator, where it interferes with the light generated in the resonator. This changes the basic properties of the laser and the light emitted by the laser. This phenomenon is also called a "self-mixing effect".
  • another, independent of the laser resonator interference detector can be used, for example, the light generated by the laser coupled out by means of partially transmissive mirror and is brought to the object scattered light outside the resonator to interference.
  • the frequency of the Doppler effect changes scattered and reflected in the direction of the laser light as a function of the velocity component in the direction of the laser beam.
  • This frequency change is for realistically to be detected object movements in the order of about one kilohertz to several megahertz and can thus be evaluated without delay using conventional electronic means.
  • a frequency shift is still measurable even for objects with nearly unstructured smooth or reflective surfaces. Thus, it suffices smallest inhomogeneities and scattered light components to cause a measurable frequency change.
  • Parameters which may change due to the self-coupling effect of the laser are, for example, the power consumption or the junction resistance, the intensity of the emitted laser light, the frequency and the diameter of the laser beam or the threshold amplification of the laser.
  • These parameter values change with a frequency corresponding to the frequency difference between the laser generated and the laser light scattered back into the laser.
  • This frequency difference in turn is proportional to the velocity component of the object surface in the direction of the laser light beam. It is thus possible to determine the velocity component of the object surface in the respective direction by detecting and evaluating the fluctuations of one or more of these parameter values.
  • the light sources of the sensors emit at least approximately monochromatic light.
  • they can be arranged close to each other spatially, preferably on a common chip, or at a greater distance from one another. They may be directed to the object to be detected so that the points of impact or areas on the object surface are close (eg within a few millimeters) to each other or to each other.
  • they can be controlled in clocked manner, for example in a predeterminable sequence, or several light sources with different frequencies can be used.
  • optical elements such as lenses, mirrors or grating structures can be used, which - depending on the position of the individual light sources - can be used separately for each of the light sources or for two or more of the light sources.
  • each of the light sources is assigned a detection device.
  • these can also comprise common parts, eg an evaluation unit for the alternating or parallel processing of the individual measured quantities.
  • the "self-mixing" effect allows a very compact and space-saving design of the sensors, since the detection device is coupled directly to the light source and can be integrated together on a common chip, and since the transmission beam and the detection beam are influenced by a common optics.
  • the evaluation unit for processing the detected signals is preferably also integrated on the chip and freely configurable or programmable.
  • An external controller is not mandatory and the sensors can be easily adapted to different tasks. It is also possible to arrange the optics directly to the chip and to connect directly or indirectly with this. This eliminates additional optical elements and related adjustments. The space requirement is so extremely low.
  • the detectors which detect the intensity fluctuations in the laser resonator can be designed as photoelectric detectors, wherein preferably those photodiodes are used, which are arranged at a laser diode in any case at the rear resonator and are conventionally used for keeping constant the laser power.
  • the device according to the invention and the method according to the invention can be used for sewing machines, embroidery machines, quilting devices and the like for detecting and controlling or regulating a wide variety of different types of machines Movements are used. Alternatively or additionally, motion information detected in this way can also be stored and queried at a later time. This is particularly advantageous when capturing sewing and embroidery patterns.
  • the detection device is arranged at least partially stationary in the vicinity of a movable machine part or sewing object to be detected.
  • the detection device or the detection optics can also be moved relative to an object to be detected, for example if they are integrated in a stylus or a corresponding other input means for detecting patterns or seam progressions.
  • the detection device can be connected in this case, for example via radio or via a communication line with a sewing machine control or a data acquisition device.
  • FIG. 1 shows the principle of operation of detecting a movement by means of a self-coupling laser Doppler interferometer.
  • a laser - preferably a semiconductor laser - generates coherent light, which is amplified in a cavity or a resonator 3 with a front, partially transmissive mirror 5 and a rear mirror 7.
  • the decoupled coherent light is focused by one or more optical elements, for example by a converging lens 9, to form a light beam or transmission beam 11. This applies to an object to be detected 13 and is there at least partially scattered. A part of the scattered light is reflected back as a receiving beam 15 in the direction of the laser.
  • He passes there the optical elements and then enters through the mirror 5 in the resonator 3 a.
  • the thus coupled back into the resonator 3 light interferes with the light amplified in the resonator 3, as for example from the WO-A1-02 / 37410 is known.
  • This interference phenomenon influences the gain of the laser and the intensity of the laser or transmit beam 11 generated by the laser.
  • the intensity of the transmit beam 11 has minima and maxima as a function of the distance.
  • the object 13 moves at a speed which has at least one positive or negative component in the propagation direction of the transmission beam 11 (in other words, a component in or opposite the propagation direction), the frequency of the receiving beam 15 changes slightly due to the Doppler effect.
  • the intensity fluctuations for example by means of a rear side behind the rear, only slightly semitransparent laser mirror 7 arranged photodiode 17, the component of the object speed in the direction of the transmission beam 11 can be determined.
  • Such photodiodes 17 are conventionally used for keeping the intensity of the laser light constant.
  • the direction of movement can be determined on the basis of the asymmetry of the functions f (L) and g (L), where f is the frequency of the laser, g the gain in the laser resonator 3 and L the object distance from the front resonator mirror 5.
  • the surface of the machine or accessory parts to be detected can be roughened or coated, for example, whereby the diffuse scatter proportion of the laser light is increased.
  • the object 13 to be detected is a bobbin rotatable about a bobbin axis 19.
  • the transmission beam 11 impinges on the flange surface in the edge region of the front coil flange 21 at an angle of incidence ⁇ .
  • the transmission beam 11 has at least one directional component corresponding to the surface speed v A of the flange surface at the point of impingement A.
  • the transmission beam 11 is oriented so that its directional component in the direction of the surface velocity v A at the point of impact A is relatively large.
  • the bobbin is shown in Figure 2 in a bobbin case 23 and together with this in the gripper 24th used, which is arranged in the lower arm 25 of the sewing machine below the needle plate 27 in a gripper housing 29 (Fig. 3).
  • the remaining parts of the commercial gripper 24 as the gripper body 28, the seated on the drive shaft 31 pinion 30 and the thread catching plate 32 are not described in detail.
  • the detection of the bobbin can be done depending on the visibility of the respective gripper assembly from different directions.
  • the front flange 21 or the rear flange 21 'of the coil can be detected from the front or from behind or radially from the outside.
  • the sensor or sensors may be integrated into the drive shaft 31 of the gripper 24 (not shown) and, relative thereto, detect the rotational movement of the spool by scanning the sleeve-like spool or core 33 (FIG. 1) from the inside.
  • the sensor or sensors may be arranged, for example, on the bobbin case 23 or within the gripper housing 29. In the arrangement of a sensor on the bobbin case 23 or the gripper 24 power supply and communication to the sensor, for example by means of sliding contacts (not shown) on the drive shaft 31 can be ensured.
  • openings 26 may be provided in the bobbin case 23, through which the coil can be scanned. It is also possible in the gripper housing 29 a plurality of sensors annular distributed around the coil axis 19 of the coil used (not shown), so that always at least one of these sensors can detect the coil through the recess 26 in the bobbin case 23 through, even if the bobbin case 23 rotates. In this case, the sensor electronics or the controller evaluates the various sensor signals and takes into account only those signals which detect the coil movement at the respective time.
  • the bobbin in operation has only a single degree of freedom, namely the rotational movement about the spool axis 19. Therefore, a suitable arrangement with a single sensor with only one transmit beam 11 is sufficient to clearly detect this movement.
  • the electronics or control required for evaluating the sensor signals may be partially or completely integrated into the sensor or may be partially or completely covered by the machine control.
  • a non-volatile storage medium (not shown) is preferably provided, in which information about the object to be detected 13, about its position, orientation in space and its movement possibilities and about the arrangement of the sensor or sensors can be stored as needed. In conjunction with information stored in this way, the controller can determine the associated movements, positions, etc., of the detected object 13 from the sensor signals.
  • the direction of the object movement at the point of impact A are decomposed into a plurality of components, one of which has the direction of the transmission beam 11.
  • the ratio of this component of motion to the total object movement and the distance r A of the point of impact A from the coil axis 19 can then be stored in the memory (FIG. 1).
  • any movements in objects 13 with multiple degrees of freedom can be detected by a plurality of sensors or by sensors with multiple transmitted beams 11, wherein the transmission beams 11 impinge on the object 13 in different directions.
  • the number of degrees of freedom of movement determines the number of transmission beams 11 required for unambiguous detection of the object movement.
  • two or more light sources 1 can be arranged close to one another on a common chip or substrate, the associated transmission beams 11 preferably being emitted from different sides through a common optical system 9 in the direction of the object 13 to be detected.
  • a plurality of transmission beams 11 may be irradiated independently of each other from different directions on the object 13 become. If the individual light sources 1 are arranged spatially separated from one another, object movements can also be detected from a greater distance (eg 10 cm to 15 cm).
  • the optical elements 9 may be formed so that the transmission beams 11 are not focused sharply on a point, but over a larger area have a slight blurring.
  • Such transmission beams 11 have within the usable measuring range in the direction of propagation a uniform or only slightly varying beam diameter. In this way, object movements can be detected reliably even in the direction of the transmission beam 11, since the intensity of the scattered light component, which is coupled back into the resonator 3, varies only slightly with such movements.
  • other objects 13 are detected by one or more sensors, eg sewing machine parts such as sewing needle, needle holder, presser foot, feed dog, gripper, bobbin embroidery hoop, etc. or objects 13 to be processed or components such as the sewing material or - in the case of several material layers - The top and / or bottom fabric layer, the upper thread or the lower thread. Accordingly, the sensors are arranged at suitable locations of the sewing or embroidery machine.
  • sewing machine parts such as sewing needle, needle holder, presser foot, feed dog, gripper, bobbin embroidery hoop, etc.
  • objects 13 to be processed or components such as the sewing material or - in the case of several material layers -
  • the sensors are arranged at suitable locations of the sewing or embroidery machine.
  • FIG. 3 shows a section of a sewing machine in the region of the stitch formation unit.
  • the throat plate 27 three recesses 35 (alternatively, only one or two recesses may be provided) formed therein with optical elements.
  • These optical elements can comprise, for example, transparent windows for the light of the light sources 1, which windows are inserted flush into the recesses 35 flush with the upper side of the throat plate 27.
  • the optical elements can also comprise converging lenses 9 (FIG. 1).
  • the curvature can protrude slightly beyond the plane of the throat plate 27.
  • the sensors are arranged with the light sources 1. In each case one or more sensors can be arranged under each of the lenses 9.
  • two sensors each having a light source 1 are arranged such that the transmission beams 11 generated by the light sources 1 are in different directions of the proximate plane, preferably in the sewing direction y and in the transverse direction x, from below at an angle of incidence ⁇ (FIG. 1) of the order of magnitude of approximately 15 ° to approximately 75 ° to the sewing material (not shown).
  • ⁇ angle of incidence
  • the two transmission beams 11 can impinge on the sewing material even at different angles of incidence ⁇ .
  • a third sensor can be provided, wherein the transmission beam 11 preferably strikes the sewing material at an angle of incidence ⁇ of 0 °, that is to say vertically.
  • the transmission beam 11 of the third light source 1 can impinge on the material under another angle of incidence ⁇ .
  • the material surface can be detected at different locations, for example in the region of two recesses 35 of several sensors.
  • the recesses 35 with the sensors can be arranged, for example, on one side or on both sides of the needle insertion opening 37 in the needle plate 27 and / or in the sewing direction y, in front of or behind the needle insertion opening 37.
  • Their mutual distance is just a few centimeters big enough that Rotational movements of linear displacements can be distinguished, and small enough that errors due to a possible wrinkling of the fabric are minimal.
  • the detection of movements or changes in position of the sewing material in the region of the needle entry point can be used, for example, to detect deviations of the actual material movement from a predetermined material movement and to control the transport device (eg conveyor or embroidery frame).
  • the transport device is not active. The sewing material is guided there by hand.
  • the stitch formation unit can be controlled in such a way that - independently of the sewing material speed - needle stitches are set with uniform spacing of the puncture sites in the sewing material.
  • the detection device can be used to capture and store a sewing pattern. On the basis of the stored data, this sewing pattern can later be reconstructed as often as desired (for example using an embroidery frame) become.
  • the sensor device may be integrated into a stylus or equivalent scanning device. To scan the template here remains the template in peace and the stylus is moved relative to the template.
  • sensors are installed in the presser foot 41 or in a sock foot 42, as shown schematically in FIG.
  • the electronics for detecting and evaluating the sensor signals is integrated together with the light source 1 on a chip 53.
  • the electronics of the presser foot 41 can be connected to the control of the sewing machine, for example by means of a cable plug 55 (not shown).
  • the connection between presser foot and machine control can also take place in other ways, for example via spring contacts between presser foot 41 and presser rod 43 or via a wireless communication connection.
  • sensors-with appropriately adapted optics-can can also be arranged directly at or below the machine head 39.
  • At least one sensor is arranged on the sewing machine that it can detect the withdrawal speed of the lower thread or the upper thread, so for example in the field of thread guide 51 rigidly connected to the movable needle bar 45 or on the upper arm of the sewing machine in the area resilient or clamping thread tensioning device (not shown) or in the region of the bobbin for the upper thread bobbins (not shown). Since both the upper thread and the lower thread are pulled off abruptly during sewing, a processing stage for smoothing these signals or for the running averaging can be provided in the respective evaluation. By integrating the detected speed measurement results in the amount of thread. If the amount of thread on the bobbin is stored, this value can be updated continuously. In particular, the sewing process can be stopped before reaching the thread end.
  • a minimum relative speed between the sensor and the object 13 to be detected is required in each case.
  • a conventional device for detecting changes in position can optionally be provided as an option, which evaluates, for example, changes in position of features of the object surface by means of image processing.
  • stitching machine is to be interpreted broadly and also includes quilting devices, embroidery machines or other stitch-forming or suitable for joining textile fabrics devices.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Sewing Machines And Sewing (AREA)
EP06405469A 2006-01-18 2006-11-06 Machine à coudre et procédé de detection de mouvement dans des machines à coudre Withdrawn EP1811073A2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1032006 2006-01-18

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EP1811073A2 true EP1811073A2 (fr) 2007-07-25

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EP06405469A Withdrawn EP1811073A2 (fr) 2006-01-18 2006-11-06 Machine à coudre et procédé de detection de mouvement dans des machines à coudre

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US (1) US20070163479A1 (fr)
EP (1) EP1811073A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193674B1 (fr) * 1985-03-06 1990-03-14 Osaka University Méthode pour rendre amorphe un matériau solide par injection d'atomes exotiques avec des jets d'électrons

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11015276B2 (en) * 2019-02-04 2021-05-25 Handi Quilter, Inc. Multi-sensor sewing machine with automatic needle speed adjustment

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SE8004226L (sv) * 1980-06-05 1981-12-06 Husqvarna Ab Metanordning
JP2762690B2 (ja) * 1990-05-18 1998-06-04 ブラザー工業株式会社 ミシンの下糸量検出装置
DE4101346C1 (fr) * 1991-01-18 1992-07-23 G.M. Pfaff Ag, 6750 Kaiserslautern, De
DE4116788C1 (fr) * 1991-05-23 1992-06-25 G.M. Pfaff Ag, 6750 Kaiserslautern, De
US6233045B1 (en) * 1998-05-18 2001-05-15 Light Works Llc Self-mixing sensor apparatus and method
JP2001334094A (ja) * 2000-05-26 2001-12-04 Janome Sewing Mach Co Ltd 刺繍縫いミシン
ATE463004T1 (de) * 2000-11-06 2010-04-15 Koninkl Philips Electronics Nv Verfahren zur messung der bewegung eines eingabegeräts
DE10140636C1 (de) * 2001-08-13 2003-04-24 Pfaff Ind Masch Einrichtung zum Überwachen des Spulenfadens an Doppelsteppstich-Nähmaschinen
EP1321556B1 (fr) * 2001-12-19 2006-01-04 Fritz Gegauf Ag Bernina-Nähmaschinenfabrik Procédé et dispositif pour réguler le transport de l'ouvrage dans une machine à coudre ou à broder
CH709887B1 (de) * 2002-05-30 2016-01-29 Bernina Int Ag Näh- oder Stickmaschine.
CN1326020C (zh) * 2002-06-04 2007-07-11 皇家飞利浦电子股份有限公司 测量输入设备的移动的方法
DE50306893D1 (de) * 2002-09-02 2007-05-10 Gegauf Fritz Ag Verfahren zur Bestimmung des Unterfadenvorrats und eine Nähmaschine mit einer Unterfadenvorrats-Uberwachung
JP2006517449A (ja) * 2003-02-12 2006-07-27 ケーナー，ラルフ・ジェイ キルティング方法および装置
CN1894458B (zh) * 2003-12-15 2013-09-04 弗里茨·格高夫股份公司伯尔尼纳一缝纫机厂 用于在缝纫机上控制针运动的方法和装置
US20050156874A1 (en) * 2004-01-21 2005-07-21 Microsoft Corporation Data input device and method for detecting life-off from a tracking surface by laser doppler self-mixing effects
US6959657B1 (en) * 2004-03-10 2005-11-01 Duval Richard J Optical stitch regulator system
WO2006071786A2 (fr) * 2004-12-24 2006-07-06 Koerner Ralph J Procede et dispositif de couture dans lesquels est utilise un mecanisme sous-jacent de detection de la vitesse de debit du fil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193674B1 (fr) * 1985-03-06 1990-03-14 Osaka University Méthode pour rendre amorphe un matériau solide par injection d'atomes exotiques avec des jets d'électrons

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