EP0205377B1 - Werkstücksdickenmessvorrichtung für Nähmaschine - Google Patents

Werkstücksdickenmessvorrichtung für Nähmaschine Download PDF

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Publication number
EP0205377B1
EP0205377B1 EP86401166A EP86401166A EP0205377B1 EP 0205377 B1 EP0205377 B1 EP 0205377B1 EP 86401166 A EP86401166 A EP 86401166A EP 86401166 A EP86401166 A EP 86401166A EP 0205377 B1 EP0205377 B1 EP 0205377B1
Authority
EP
European Patent Office
Prior art keywords
signal
values
level
receiver
thickness
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
EP86401166A
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English (en)
French (fr)
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EP0205377A1 (de
Inventor
Charly Leclaire
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.)
Prouvost SA
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Prouvost SA
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Publication date
Application filed by Prouvost SA filed Critical Prouvost SA
Priority to AT86401166T priority Critical patent/ATE51905T1/de
Publication of EP0205377A1 publication Critical patent/EP0205377A1/de
Application granted granted Critical
Publication of EP0205377B1 publication Critical patent/EP0205377B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position
    • D05B69/24—Applications of devices for indicating or ascertaining sewing-tool position

Definitions

  • topstitching are carried out parallel to an edge of the piece of fabric, edge which may have angles requiring stopping the sewing at a determined distance from one side of the angle, a rotation of the sewing piece, a resumption of the stitching to the next angle ...
  • Numerous devices capable of detecting the edge of a fabric when the latter discovers, for example, a photoelectric cell situated opposite a transmitter.
  • the precision of these devices is relatively random and that their behavior varies enormously from one fabric to another. It is also known to use similar devices emitting and receiving infrared radiation which makes it possible to detect variations in thickness and therefore to determine a signal for the passage of an edge during a thickness plating operation. on another.
  • the precision of these devices is small and they require a very long time to adapt their sensitivity to the nature of the sewn fabric, depending on whether the latter is more or less opaque.
  • the present invention relates to an important improvement to these detectors of the second type by means of a device for processing the signals received by the "cell" which makes the adaptation of the detector to the various tissues extremely simple to perform and which makes it possible to obtain a frank signal whose exploitation in logic to attack a power device is simple to implement.
  • the document FR-A-2.503.201 relates to a device for adjusting and acting on the shape of a seam, by puiding the sewing fabric according to a determined geometrical path towards the place of sewing. If, in a manual phase, signal values corresponding to the movement of the fabric are effectively stored, and corresponding if necessary to several thicknesses of fabric, this storage is carried out in an unintelligent manner, the values being stored sequentially and not receiving any further treatment. In particular, these values are not compared with each other for the purpose of determining a threshold.
  • the device as used does not allow the generation of a control signal containing the fabric thickness change information. Indeed, the correction signal generated during such a change in thickness only contains information on the position of the fabric.
  • a device for detecting the variation in thickness of a fabric passing under the presser foot of a sewing machine during a sewing operation comprising a signal transmitter and a receiver between which said fabric passes, means using the level of the signal received by the receiver to send a control signal to a logic device controlling the operation of sewing during these, which include means for reading a plurality of signal values corresponding to each thickness of fabric and recording at least one of these values during a calibration operation, and a comparator comparing the signal read during said sewing operation with the recorded values and sending said control signal to said logic device as a function of the result of the comparison (document FR-A-2.503.201), characterized in that said means are arranged to record the minimum value (A) relating to the smallest fabric thickness and the maximum value (a) relating to the largest fabric thickness, and a calculating device is provided for calculating a high threshold and a low threshold which are a function of and between said minimum and maximum values (A, a), said
  • Such a device allows a very easily achievable adaptation, in a few seconds, of its sensitivity as a function of the nature of the opacity and the thicknesses of the fabric being worked.
  • said high threshold is equal to said minimum value. reduced by a quarter of the value of the difference between said minimum and maximum values, and said low threshold is equal to said maximum value, increased by a quarter of the value of this difference.
  • the device is arranged to read said plurality of signal values corresponding to each thickness of fabric when the fabric is moved between the transmitter and the receiver for a determined period of time. This way of proceeding is indeed one of the safest and quickest to obtain said plurality of values.
  • the device comprises an amplifier for amplifying said signal received by the receiver, and a comparator for comparing an output signal from said amplifier corresponding to the smallest fabric thickness with a saturation threshold of saturation of the amplifier, and produce a signal to adjust the intensity of the radiation emitted by the emitter so that making said output signal substantially equal to said saturation threshold, during said calibration operation.
  • the invention relates to a device for detecting the edge of a fabric passing under the presser foot of a sewing machine during a sewing operation, comprising a signal transmitter and a receiver between which said fabric passes and means using the level of the signal received by the receiver to send a control signal to a logic device controlling the sewing operation during it, which includes means for reading a plurality of signal values in the absence and in the presence of fabric, and record at least one of these values during a calibration operation, and a comparator comparing the signal read during said sewing operation with the recorded values and sending said control signal to said logic device according to the result of the comparison, characterized in that said means are arranged to record the minimum value (A) relating to the absence of fabric and the maximum value ( a) relating to the presence of fabric, and a calculating device is provided for calculating a high threshold and a low threshold which are a function of said minimum and maximum value (A, a) and between them, said comparator being arranged to send said control signal only when said edge passes and on condition
  • the device is arranged to read said plurality of signal values in the absence of fabric for a determined period of time, and said plurality of signal values in the presence of fabric when the latter is moved between the transmitter and the receiver for a specified period of time.
  • a sewing machine sewing head comprising in particular a needle 1 and a presser foot 2 under which two pieces of fabric 3 and 4 have been placed during assembly by a seam 5.
  • the piece 3 has an edge 3a substantially perpendicular to its edge 3b along which the seam 5 is executed.
  • Automation of the operation requires knowing when the edge 3a arrives at a fixed distance from the needle.
  • a detector has been placed near the needle 1 for varying the thickness of the fabric, constituted in the case of an infrared emitter 6 and, directly below it.
  • This receiver 7 could be a phototransistor or the end of an optical fiber connected to a phototransistor.
  • Means for adjusting the intensity of the radiation produced by the emitter 6 include a comparator 8b integrated in a microprocessor for controlling the sewing machine. The mode of use of this comparator 8b will be specified later.
  • the principle of detection is based on the fact that the opacity of two thicknesses of fabric is greater than that of a single thickness, which causes a variation in the level of the signals received by the receiver 7 when passing the edge 3a. . This level variation is then used to generate a signal transmitted to the input of the microprocessor controlling the sewing machine.
  • the intensity of the radiation received by the receiver 7, and therefore the variation of this intensity when passing the edge 3a depends on the nature of the fabric. It is therefore necessary, in order to make possible the use of the detector in the presence of different types of fabric, provided of course that these do not completely screen the radiation, to associate with this detector means making it possible to adapt to these different fabrics in a simple way.
  • the radiation received by the receiver 7 is converted into an electrical signal in a known manner which is amplified by means of an amplifier 8 with constant gain.
  • the output signal of the amplifier 8 is then led to the input of an analog-digital converter 9.
  • the output of this converter is connected to the input of a comparator 10, where the digitized signal is compared to two set values entered in the comparator at 11 and 12.
  • the state of the output 13 of the comparator changes when the signal digitized delivered by the receiver 7 goes from a level higher than the high reference value 11 to a level lower than the low reference value 12 and vice versa. This change of state constitutes a signal capable of being exploited by the microprocessor (not shown) for controlling the machine.
  • the invention includes a device calibration procedure according to which the signals obtained with the fabrics in question are stored and a calculation of the setpoints (or thresholds) is carried out from these stored signals.
  • a manual control button 20 which places the device either in “recording” and determination of the above-mentioned thresholds, as shown in the drawing, or in the detection position.
  • a thickness of fabric is placed between the emitter 6 and the receiver 7.
  • Amplifier 8 has a saturation threshold 8a which is introduced at the input of comparator 8b. Furthermore, the output signal of the amplifier 8, processed by the analog-digital converter 9, is also introduced at the input of the comparator 8b and compared to the saturation threshold 8a. The intensity of the radiation produced by the emitter 6 is adjusted so as to make the output signal from the amplifier 8 substantially equal to said saturation threshold 8a. The said thickness of fabric is then moved for a few seconds to take account of the heterogeneities of the fabric.
  • the output signal from the receiver 7 is variable over a range bordered by a maximum value and a minimum value which alone are stored (in digital form), separately but indistinctly, in memories 21 and 22.
  • a manual control button 23 is actuated, from the position which it occupies in the figure.
  • a calculating unit 26 normally part of the microprocessor for controlling the machine, establishes the above-mentioned reference values (11 and 12) as follows:
  • this value constitutes the minimum stored value A of the signal transmitted by the receiver 7. It determines in an analogous manner, by comparison of the content of the memories 24, 25, the maximum value stored a of the signal transmitted by the receiver 7 in the presence of two thicknesses of fabric.
  • the high setpoint value can also be defined as being equal to the minimum value A, reduced by a quarter of the value of the difference between said minimum value A and said maximum value a.
  • the low setpoint is equal to the maximum value a, increased by a quarter of the value of the difference (A-a).
  • Such a method of determination makes it possible to obtain thresholds which it is certain that they will not be crossed until a variation in thickness is detected, and not due to the hazards in the homogeneity of the fabrics.
  • the device is calibrated (determination of the set values) in the same way by adjusting the radiation level and by recording the above high values in the absence of fabric (for a few seconds to take account of any possible interference) and by recording low values in the presence of the fabric layer which is moved under the detector for also a few seconds.
  • the invention finds an interesting application in the clothing and furnishing industry where numerous repetitive sewing operations are present.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length-Measuring Devices Using Wave Or Particle Radiation (AREA)

Claims (6)

1. Vorrichtung zum Abtasten der Dickenänderung eines Stoffs (3,4), der unter dem Drückerfuß (2) einer Nähmaschine während eines Nähvorgangs hindurchläuft, bestehend aus einem Signale sendenden Sender (6) und einem Empfänger (7), zwischen denen der Stoff (3, 4) hindurchläuft, Einrichtungen, die unter Verwendung der Stärke des von dem Empfänger (7) empfangenen Signals einer logischen, den Nährvorgang steuernden Vorrichtung während diesem ein Steuersignal (13) liefern und Einrichtungen (23, 21, 22, 24, 25) zum Lesen mehrerer, jeder Stoffdicke entsprechender Werte des Signals und zum Speichern mindestens eines dieser Werte während eines Eichvorgangs enthalten, und einem Vergleicher (10), der da während des Nähvorgangs gelesene Signal mit den gespeicherten Werten vergleicht und der logischen Vorrichtung in Abhängigkeit von dem Ergebnis des Vergleichs das Steuersignal (13) liefert, dadurch gekennzeichnet, daß die Einrichtung (23,21,22,24,25) so ausgebildet sind, daß sie den die kleinste Stoffdicke betreffenden niedrigsten Wert (A) und den die größte Stoffdicke betreffenden höchsten Wert (a) speichern, und daß eine Rechenvorrichtung (26) vorgesehen ist, die eine obere Schwelle (11) und eine untere Schwelle (12) errechnet, die von diesen Werten (A, a) abhängig sind und zwischen diesen liegen, wobei der Vergleicher (10) so ausgebildet ist, daß er das Steuersignal (13) nur dann liefert, wenn diese Dickenänderung auftritt, und unter der Bedingung, daß das gelesene Signal von einem über der oberen Schwelle (11) liegenden Wert auf einen unter der unteren Schwelle (12) liegenden Wert übergeht oder umgekehrt.
2. Vorrichtung nach Anspruch 1, bei der die obere Schwelle (11) gleich dem niedrigsten Wert minus einem Viertel des Werts der Differenz zwischen dem höchsten und dem niedrigsten Wert und die untere Schwelle (12) gleich dem höchsten Wert plus einem Viertel des Werts dieser Differenz ist.
3. Vorrichtung nach Anspruch 1, die so ausgebildet ist, daß sie mehrere jeder Stoffdicke entsprechende Werte des Signals liest, wenn der Stoff zwischen dem Sender und dem Empfänger während eines bestimmten Zeitraums bewegt wird.
4. Vorrichtung nach Anspruch 1, mit einem Verstärker (8), der das von dem Empfänger (7) empfangene Signal verstärkt, und einem Vergleicher (8b) der ein der kleinsten Stoffdicke entsprechendes Ausgangssignal des Verstärkers mit einer Sättigungsschwelle (8a) des Verstärkers vergleicht und ein Signal erzeugt, um die Stärke der von dem Sender gesendeten Strahlung so einzustellen, daß das Ausgangssignal während diese Eichvorgangs im wesentlichen gleich der Sättigungsschwelle wird.
5. Vorrichtung zum Abtasten der Kante eines während eines Nähvorgangs unter dem Drückerfuß (2) einer Nähmaschine hindurchlaufenden Stoffes (3, 4), bestehend aus einem Signale sendenden Sender (6) und einem Empfänger (7), zwischen denen der Stoff (3, 4) hindurchläuft, und Einrichtungen, die unter Verwendung der Stärke des von dem Empfänger (7) empfangenen Signals einer den Nähvorgang steuernden logischen Vorrichtung während diesem ein Steuersignal (13) liefern und Einrichtungen (23, 21, 22, 24, 25) zum Lesen mehrerer Werte des Signals bei Fehlen und bei Vorhandensein eines Stoffs und zum Speichern mindestens eines dieser Werte während eines Eichvorgangs enthalten, und einem Vergleicher (10), der das während des Nähvorgangs gelesene Signal mit den gespeicherten Werten vergleicht und das Steuersignal (13) der logischen Vorrichtung in Abhängigkeit von dem Ergebnis des Vergleichs liefert, dadurch gekennzeichnet, daß die Einrichtungen (23,21,22, 24, 25) so ausgebildet sind, daß sie den sich auf das Fehlen von Stoff beziehenden kleinsten Wert (A) und den sich auf das Vorhandensein von Stoff beziehenden höchsten Wert (a) speichern, und daß eine Rechenvorrichtung (26) zum Berechnen einer oberen Schwelle (11) und einer unteren Schwelle (12) vorgesehen ist, die von diesen Wertern (A, a) abhängig sind und zwischen diesen liegen wobei der Vergleicher (10) so ausgebildet ist, daß er das Steuersignal (13) nur bei Durchgang der Stoffkante und unter der Voraussetzung liefert, daß die gelesene Signal von einem über der oberen Schwelle (11) liegenden Wert auf einen unter der unteren Schwelle (12) liegenden Wert oder umgekehrt übergeht.
6. Vorrichtung nach Anspruch 5, die so ausgebildet ist, daß sie die Werte des Signals bei Fehlen von Stoff während eines bestimmten Zeitraums und die Werte des Signals bei Vorhandensein von Stoff liest wenn dieser zwischen dem Sender und dem Empfänger während eines bestimmten Zeitraums bewegt wird.
EP86401166A 1985-06-03 1986-06-02 Werkstücksdickenmessvorrichtung für Nähmaschine Expired - Lifetime EP0205377B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86401166T ATE51905T1 (de) 1985-06-03 1986-06-02 Werkstuecksdickenmessvorrichtung fuer naehmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8508317 1985-06-03
FR8508317A FR2582683B1 (fr) 1985-06-03 1985-06-03 Dispositif de detection de la variation d'epaisseur d'une etoffe et son procede d'etalonnage

Publications (2)

Publication Number Publication Date
EP0205377A1 EP0205377A1 (de) 1986-12-17
EP0205377B1 true EP0205377B1 (de) 1990-04-11

Family

ID=9319799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86401166A Expired - Lifetime EP0205377B1 (de) 1985-06-03 1986-06-02 Werkstücksdickenmessvorrichtung für Nähmaschine

Country Status (12)

Country Link
US (1) US4829194A (de)
EP (1) EP0205377B1 (de)
JP (1) JPS61279296A (de)
KR (1) KR870000473A (de)
AT (1) ATE51905T1 (de)
BR (1) BR8602541A (de)
CA (1) CA1273427A (de)
DE (1) DE3670318D1 (de)
ES (1) ES8704220A1 (de)
FR (1) FR2582683B1 (de)
IL (1) IL78945A (de)
PT (1) PT82698B (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01167139A (ja) * 1987-12-23 1989-06-30 Brother Ind Ltd 光学センサーの制御装置
DE3803353A1 (de) * 1988-02-05 1989-08-17 Truetzschler & Co Vorrichtung zur gewinnung von messgroessen, die der dicke von in der spinnereivorbereitung anfallenden faserverbaenden, z.b. kardenbaendern o. dgl. entsprechen
JPH01212596A (ja) * 1988-02-22 1989-08-25 Brother Ind Ltd 布段・布端検出器付ミシン
JPH0480Y2 (de) * 1989-05-08 1992-01-06
DE3934933A1 (de) * 1989-10-20 1991-04-25 Pfaff Ag G M Anordnung und verfahren zum detektieren einer werkstueckkante
US5118209A (en) * 1990-03-30 1992-06-02 Transtechnology Corporation Print gap optimizer
US7076003B1 (en) * 1999-03-03 2006-07-11 Agere Systems Inc. Constellation design for modem receiver
WO2000052239A1 (de) * 1999-03-04 2000-09-08 Zellweger Luwa Ag Verfahren und vorrichtung zur qualitätsüberwachung textiler bänder
US6715435B1 (en) * 2003-01-20 2004-04-06 Irvin Automotive Products, Inc. Sewing machine for close-tolerance stitching
DE10323158B3 (de) * 2003-05-22 2004-07-08 Dürkopp Adler AG Nähmaschine mit einem Sensor zur Erfassung der Nähgut-Dicke
DE102005049771A1 (de) * 2005-10-18 2007-04-19 Dürkopp Adler AG Nähmaschine
JP2016064096A (ja) * 2014-09-26 2016-04-28 ブラザー工業株式会社 ミシンとミシンの制御方法

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US3609373A (en) * 1970-05-18 1971-09-28 Singer Co Photoelectric sensors and circuitry for edge-guiding systems for sewing machines
GB1399256A (en) * 1971-10-22 1975-07-02 Sick Erwin Method and apparatus for detecting the passing of a straight contrast boundary
FR2179537A1 (en) * 1972-04-11 1973-11-23 Jaep Sa Ets Industrial sewing machine pneumatic controls - incl sensor for stopping air supply when work piece absent
US4237378A (en) * 1977-12-28 1980-12-02 Brandt-Pra, Inc. Photoelectric apparatus for document counting and overlap detection
US4380390A (en) * 1979-10-29 1983-04-19 Canon Kabushiki Kaisha Exposure correcting device
US4248168A (en) * 1980-03-13 1981-02-03 The Singer Company Sewing machine arranged for edge following by needle movement
JPS5757160A (en) * 1980-09-16 1982-04-06 Kenji Oki Apparatus for and method of drawing line with use of adhesive tape
DD160751A3 (de) * 1981-04-06 1984-02-29 Textima Veb K Schaltungsanordnung zum automatischen naehen
JPS57176846A (en) * 1981-04-22 1982-10-30 Tokyo Juki Ind Co Ltd Noise removing circuit
JPS57180234A (en) * 1981-04-30 1982-11-06 Tokyo Juki Ind Co Ltd Malfunction preventing circuit for photodetector
US4391215A (en) * 1981-09-18 1983-07-05 The Singer Company Self compensating optoelectronic ply and edge detector for sewing machine
DE3519729A1 (de) * 1985-06-01 1986-12-04 Frankl & Kirchner GmbH & Co KG Fabrik für Elektromotoren u. elektrische Apparate, 6830 Schwetzingen Vorrichtung zur erfassung von naehgutkanten bei mehrlagigem naehgut zur steuerung eines naehvorgangs bei einer industrienaehmaschine

Also Published As

Publication number Publication date
CA1273427A (fr) 1990-08-28
FR2582683B1 (fr) 1988-05-27
IL78945A0 (en) 1986-09-30
FR2582683A1 (fr) 1986-12-05
ATE51905T1 (de) 1990-04-15
KR870000473A (ko) 1987-02-18
DE3670318D1 (de) 1990-05-17
US4829194A (en) 1989-05-09
ES8704220A1 (es) 1987-03-16
JPH0234633B2 (de) 1990-08-06
EP0205377A1 (de) 1986-12-17
PT82698B (pt) 1992-07-31
IL78945A (en) 1989-12-15
BR8602541A (pt) 1987-02-03
JPS61279296A (ja) 1986-12-10
PT82698A (fr) 1986-07-01
ES555660A0 (es) 1987-03-16

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