EP0205377A1 - Werkstücksdickenmessvorrichtung für Nähmaschine - Google Patents

Werkstücksdickenmessvorrichtung für Nähmaschine Download PDF

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Publication number
EP0205377A1
EP0205377A1 EP86401166A EP86401166A EP0205377A1 EP 0205377 A1 EP0205377 A1 EP 0205377A1 EP 86401166 A EP86401166 A EP 86401166A EP 86401166 A EP86401166 A EP 86401166A EP 0205377 A1 EP0205377 A1 EP 0205377A1
Authority
EP
European Patent Office
Prior art keywords
fabric
thickness
minimum
maximum
thresholds
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.)
Granted
Application number
EP86401166A
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English (en)
French (fr)
Other versions
EP0205377B1 (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
Original Assignee
Prouvost SA
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 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. He 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 passage from one edge during a plating operation from one thickness to 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 carry out and which makes it possible to obtain a frank signal whose exploitation in logic to attack a power device is simple to implement.
  • the first object of the invention is a device for detecting the variation in thickness of a fabric passing under the presser foot of a sewing machine, intended to emit a signal towards a logic control device sewing operations on the passage of said thickness variation.
  • this device consists of a signal transmitter and a receiver between which said fabric passes and by a device for processing the level of the signals received by the receiver comprising a means for recording the maximum and of the minimum of said signals, manually controlled during calibration operations, a device for calculating thresholds as a function of the minimum and maximum signals recorded and a comparator of the signals read with the determined thresholds, emitting a control signal in the direction of the above logic device, when the signal becomes lower or higher respectively at the calculated low threshold and high threshold.
  • Such a device allows an adaptation very easily achievable, in a few seconds of its sensitivity depending on the nature of the opacity and the thicknesses of the fabric worked.
  • the invention has, in this regard, a second object residing in the method for calibrating the aforementioned detection device consisting in establishing two detection thresholds corresponding respectively to a first thickness and a second thickness of fabric.
  • the intensity of the signals sent in the presence of the smallest thickness to be detected is adjusted and, for each thickness of fabric, a reading of a plurality of values is carried out, recording the values maximum and minimum read, while by means of a calculating device, the above thresholds between the minimum value are determined relative to the smallest fabric thickness and the maximum value relating to the largest fabric thickness.
  • the above minimum and maximum values are digitized before storage.
  • the above-mentioned thresholds correspond respectively to the upper threshold, to the minimum value relating to the smallest fabric thickness reduced by a quarter of the value of the difference between said minimum value and the maximum value relative to the largest fabric thickness and for the lower threshold, to the maximum value relating to the largest fabric thickness increased by a quarter of the value of the above difference.
  • one of the safest and fastest ways to obtain the plurality of values necessary for the calculation of the above-mentioned thresholds is to move the thicknesses of fabric in line with the detection device.
  • 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. To do this, a detector has been placed near the needle 1.
  • 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 digital signal 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 of 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.
  • 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 invention also applies to the detection of the edge of a single thickness of fabric.
  • the calibration of the device determination of the set values is carried out in the same way by adjusting the radiation level and by recording the above-mentioned high values in the absence of fabric (for a few seconds to take account of the interference) and by recording the 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)
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 true EP0205377A1 (de) 1986-12-17
EP0205377B1 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)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843073A1 (de) * 1987-12-23 1989-07-06 Brother Ind Ltd Stoffmustersensor fuer eine naehmaschine
DE3905482A1 (de) * 1988-02-22 1989-08-31 Brother Ind Ltd Naehmaschine mit naehgutkantendetektor
GB2215835A (en) * 1988-02-05 1989-09-27 Truetzschler & Co Sliver thickness measurement
DE3934933A1 (de) * 1989-10-20 1991-04-25 Pfaff Ag G M Anordnung und verfahren zum detektieren einer werkstueckkante
EP1777331A1 (de) * 2005-10-18 2007-04-25 Dürkopp Adler Aktiengesellschaft Nähmaschine

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0480Y2 (de) * 1989-05-08 1992-01-06
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
EP1159472B1 (de) * 1999-03-04 2004-04-28 Uster Technologies AG Verfahren 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
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

Citations (6)

* Cited by examiner, † Cited by third party
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
FR2157594A5 (de) * 1971-10-22 1973-06-01 Sick Erwin
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
US4248168A (en) * 1980-03-13 1981-02-03 The Singer Company Sewing machine arranged for edge following by needle movement
FR2503201A1 (fr) * 1981-04-06 1982-10-08 Textima Veb K Procede et dispositif pour regler et agir sur la forme d'une couture
DE3224314A1 (de) * 1981-09-18 1983-04-07 The Singer Co., 06904 Stamford, Conn. Selbstkompensierende optoelektronische lagen- und saumfuehleinrichtung fuer eine naehmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JPS5757160A (en) * 1980-09-16 1982-04-06 Kenji Oki Apparatus for and method of drawing line with use of adhesive tape
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
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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
FR2157594A5 (de) * 1971-10-22 1973-06-01 Sick Erwin
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
US4248168A (en) * 1980-03-13 1981-02-03 The Singer Company Sewing machine arranged for edge following by needle movement
FR2503201A1 (fr) * 1981-04-06 1982-10-08 Textima Veb K Procede et dispositif pour regler et agir sur la forme d'une couture
DE3224314A1 (de) * 1981-09-18 1983-04-07 The Singer Co., 06904 Stamford, Conn. Selbstkompensierende optoelektronische lagen- und saumfuehleinrichtung fuer eine naehmaschine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843073A1 (de) * 1987-12-23 1989-07-06 Brother Ind Ltd Stoffmustersensor fuer eine naehmaschine
GB2215835A (en) * 1988-02-05 1989-09-27 Truetzschler & Co Sliver thickness measurement
US4962569A (en) * 1988-02-05 1990-10-16 Truzschler GmbH & Co. KG Method and apparatus for obtaining measuring values representing the thickness of a coherent fiber mass
DE3905482A1 (de) * 1988-02-22 1989-08-31 Brother Ind Ltd Naehmaschine mit naehgutkantendetektor
DE3934933A1 (de) * 1989-10-20 1991-04-25 Pfaff Ag G M Anordnung und verfahren zum detektieren einer werkstueckkante
EP1777331A1 (de) * 2005-10-18 2007-04-25 Dürkopp Adler Aktiengesellschaft Nähmaschine

Also Published As

Publication number Publication date
PT82698B (pt) 1992-07-31
ATE51905T1 (de) 1990-04-15
ES555660A0 (es) 1987-03-16
CA1273427A (fr) 1990-08-28
BR8602541A (pt) 1987-02-03
US4829194A (en) 1989-05-09
JPS61279296A (ja) 1986-12-10
DE3670318D1 (de) 1990-05-17
JPH0234633B2 (de) 1990-08-06
FR2582683B1 (fr) 1988-05-27
FR2582683A1 (fr) 1986-12-05
PT82698A (fr) 1986-07-01
IL78945A0 (en) 1986-09-30
EP0205377B1 (de) 1990-04-11
KR870000473A (ko) 1987-02-18
ES8704220A1 (es) 1987-03-16
IL78945A (en) 1989-12-15

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