EP1460160A1 - Machine à coudre - Google Patents

Machine à coudre Download PDF

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Publication number
EP1460160A1
EP1460160A1 EP04005374A EP04005374A EP1460160A1 EP 1460160 A1 EP1460160 A1 EP 1460160A1 EP 04005374 A EP04005374 A EP 04005374A EP 04005374 A EP04005374 A EP 04005374A EP 1460160 A1 EP1460160 A1 EP 1460160A1
Authority
EP
European Patent Office
Prior art keywords
thread
sewing machine
sewing
speed
control mode
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
EP04005374A
Other languages
German (de)
English (en)
Other versions
EP1460160B1 (fr
Inventor
Sevki Dr. Hosagasi
Horst Seibert
Arthur Picker
Johann Enns
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.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler 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.)
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Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP1460160A1 publication Critical patent/EP1460160A1/fr
Application granted granted Critical
Publication of EP1460160B1 publication Critical patent/EP1460160B1/fr
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
    • D05B19/00—Programme-controlled sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/04—Automatically-controlled tensioning devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/06—Applications of tensometers

Definitions

  • the invention relates to a sewing machine for sewing together at least two sewing material parts by means of an upper thread fed to the sewing material parts in an upper thread running direction and a lower thread to form a knot of upper thread and lower thread according to the preamble of claim 1.
  • Such a sewing machine is known from DE 101 13 945 C2, in which the thread tension force in the upper thread is specified as a function of the speed according to an empirically determined working characteristic.
  • the position and / or shape of the working characteristic can be changed by appropriate adjustment using three potentiometers.
  • only a control takes place in which the thread tensioning force actually generated in the upper thread has no reaction on the thread tensioning device.
  • the disadvantage of this is that the operator must remember the setting values of the potentiometers and their assignment to certain sewing processes.
  • each setting process is time-consuming because three potentiometers have to be set. This creates the risk of incorrect entries. The overall operation is not comfortable.
  • a sewing machine is known from DE 199 21 516 C2, in which the thread tension should be adjusted as accurately as possible with regard to a predetermined sewing section.
  • a measuring sensor is designed such that the corresponding thread acts directly on an actuating element of the measuring sensor that is independent of the thread tensioning device.
  • An evaluation and control device is designed such that it is within a predetermined sewing section for each of the Sewing machine performed stitch determines the maximum thread tension occurring and stores these values in an appropriate memory.
  • a characteristic value is determined from these maximum values of the thread tension with the aid of a statistical analysis method and compared with a predetermined target value. If the characteristic value deviates from the target value, a manipulated variable for regulating the thread tensioning device is determined and the setting of the thread tensioning device is changed accordingly.
  • the invention is based on the object of designing a sewing machine of the generic type in such a way that the quality of the seams which can be produced is improved.
  • the thread tensioning device can be operated in a control mode or in a regulation mode.
  • a control mode is selected, for example, when the actual sewing conditions change frequently, e.g. B. change every two to three stitches. Such sewing conditions would expose the controller to an abundance of disturbance variables, so that a favorable guidance of the thread tensioning force would not be possible.
  • the control mode is selected when the actual sewing conditions are almost unchanged over longer seam sections.
  • the embodiment according to claim 2 ensures that the thread tension parameters can each be saved as a program and can be called up again depending on the sewing operation.
  • the configuration according to claim 3 leads to a user-friendly configuration, since it enables comfortable working.
  • the only one push-and-turn button can be turned clockwise or counterclockwise without a rotation limit and can also be pressed axially against a spring force. By turning, values are specified which are saved by pressing the button. For example, you can use it to set and access the number of a thread tension program, an operating mode, namely a control mode or a regulation mode, a thread tension assigned to a low speed, the thread tension associated with a higher speed and a thread tension characteristic increase value.
  • the sewing work station shown in FIG. 1 has a sewing machine 1 which is configured in the usual way in its basic structure and which is arranged on a frame 2 which is only indicated.
  • the sewing machine 1 has in the usual way a lower part 3, a so-called base plate, an upper part 4, a so-called arm, and a stand 5 connecting the lower part 3 and the upper part 4, so that it has the overall shape of a C.
  • an arm shaft 6 is rotatably mounted, by means of which a needle bar 7 with a needle 8 can be driven up and down.
  • a gripper 9 mounted in the lower part 3 and assigned to the needle 8 is driven by the arm shaft 6.
  • a presser foot 10 is also arranged in the upper part 4.
  • the upper side 11 of the lower part 3 lies flush with a support plate 12 belonging to the frame 2.
  • the arm shaft 6 and thus the entire sewing machine 1 is driven by means of a drive motor 13 mounted in the frame 2 via a belt drive 14.
  • a motor control 15 is provided on the drive motor 13, for the actuation of which an operating switch 16, which is only indicated by the operator, is provided.
  • On the sewing machine 1 there is also a position sensor coupled to the arm shaft 6 17 attached, which is connected via a line 18 to an operating unit 19, which in turn is connected to the controller 15 via a line 20.
  • the control unit 19 and the motor control 15 together form a sewing machine control device.
  • the position transmitter 17 transmits signals representing the rotational position of the arm shaft 6 to the control 15 via line 18 at predetermined angular intervals. 512 signals per revolution of the arm shaft 6 are customary. These signals can be used, among other things, to determine the speed of the arm shaft 6 and the respective position the needle 8 are derived.
  • the position transmitter 17, which is also referred to as a rotary pulse transmitter emits a reference signal representing a zero position with each revolution.
  • a thread supply not shown
  • needle thread leads to the needle 8 becomes.
  • a first sewing material part 24 and a second sewing material part 25 are sewn together, with the sewing machine 1 designed as a double lockstitch sewing machine between the upper thread 23 and one in practice also bobbin thread 26 referred to as looper thread, a knot 27 is formed by means of the looper 9, which should preferably lie in the butt region 28 of the sewing material parts 24, 25, that is to say in the middle of the sewing material parts 24, 25 sewn together, so that it is not visible from any side as shown in Fig. 6.
  • the sewing machine 1 described so far is generally known as an industrial sewing machine and is used millions of times in practice.
  • a thread tensioning device 29 shown in FIGS. 2 and 3 is attached to the sewing head 21.
  • This has a support plate 31 attached to the sewing head 21 by means of screws 30.
  • Attached to this support plate 31 is a thread tensioning device 32 which has an electro-magnet 34 which is provided with a magnet coil 33 formed by a wire winding and which is arranged on the back of the support plate 31 in an adapted recess 35 in the sewing head 21 ,
  • a bolt 36 is displaceably arranged centrally within the coil 33, on which a disk 37 made of ferromagnetic material, usually iron, which essentially covers the electro magnet 34 and serves as a magnet armature, is fixedly arranged, which is held by the electro magnet 34 is attracted when current flows through the coil 33.
  • the force with which the disc 37 is attracted depends on the strength of the current which flows through the coil 33.
  • the bolt 36 passes through the support plate 31.
  • a tensioning washer 39 is fastened by means of a self-locking nut 40.
  • the tensioning disk 39 can move with the bolt 36 and the disk 37 fastened on it in the longitudinal direction of the bolt 36; but it is secured against rotation by means of a pin 41.
  • the displaceable tensioning disk 39 is assigned a stationary tensioning disk 42 attached to the front side 38 of the support plate 31.
  • a gap 43 for receiving the upper thread 23 is arranged between the tensioning disks 39, 42.
  • the tensioning discs 39 and 42 thus form two interacting pressure elements or thread tensioning elements.
  • a further thread guide 47 of the same design as the thread guide 46 is arranged behind the device 32 in the running direction 44.
  • the upper thread 23 is guided from the thread supply (not shown) through the thread guide 45 and the thread guide 46 to the device 32.
  • the upper thread 23 is guided through the gap 43 above the bolt 36 and then to the thread guide 47. From there it is guided back to the device 32, namely below the pin 36 through the gap 43.
  • the displaceable tensioning disk 39 thus presses the upper thread 23 on both sides of the pin 36 against the stationary tensioning disk 42, so that no tilting of the pin 36 can occur.
  • the upper thread 23 is guided from the device 32 to the thread lever 22 via a conventional compensating spring 48.
  • the compensating spring 48 serves to compensate for the slight inaccuracies when guiding the upper thread 23 via the thread lever 22.
  • An operating device 49 for the thread tensioning device 32 is also attached to the support plate 31.
  • this has a one-button control unit 50 and a display unit 51.
  • the operating unit 50 has a rotary pushbutton 52 which can be rotated in both directions of rotation without limitation. It is coupled to a rotary pulse transmitter 53, which in the usual way has a light barrier 54 with a slotted disc 55 arranged inside it. Turning the button 52 causes pulses to be output, with each slot in the slot disk 55 triggering a signal as it passes through the light barrier 54 in the usual way. The pulses are forwarded to a microprocessor 57 via a line 56. Rotating knob 52 in one direction of rotation causes the microprocessor to count up, while rotating in the opposite direction counts down causes.
  • the rotary pushbutton 52 is also connected to a pushbutton switch 58, which is closed when the button 52 is pressed in the direction of the support plate 31 and in this case gives a signal to the microprocessor 57 via a line 59.
  • the button 52 is pressed in against a compression spring 60.
  • the display unit 51 has five display fields 61 to 65.
  • the display field 61 marked with # digitally shows a 2-digit, that is, from 00 to 99, adjustable sewing program number.
  • the display field 62 labeled M indicates the operating mode, that is to say the control or regulation mode, with one digit.
  • the display field 63 labeled F1 shows a thread tension force assigned to a speed n1 in two digits.
  • the display field 64 labeled F2 likewise shows a two-digit thread tensioning force assigned to a speed n2.
  • the display field 65 labeled F> shows a 2-digit increase in the characteristic curve, that is to say a value by which an F value can be increased when the sewing material parts 24, 25 thicken.
  • the display unit 51 is also connected to the microprocessor 57 via a line 66.
  • a thread tension measuring device 67 is also provided on the support plate 31, the structure of which can be seen in FIGS. 2 and 4.
  • This measuring device 67 has a foot part 68 fastened on the support plate 31, in which a flexible bending wire 69 is clamped on one side, that is to say like a cantilever arm.
  • a permanent magnet 70 which acts on a Hall sensor 71, is attached to this bending wire 69.
  • the upper thread 23 is guided by two thread guides 72, 73, which are arranged upstream or downstream of the bending wire 69.
  • the upper thread 23 is guided around the bending wire 69, whereby it is clearly deflected from its straight course between the thread guides 72, 73, as can be seen in FIG. 4.
  • the Hall sensor 71 emits signals which are fed to the microprocessor 57 via a line 74, specifically via an amplifier 75 and an analog-to-digital converter 76 arranged downstream thereof.
  • the microprocessor 57 having a memory 77 is supplied via line 18 and an input 78 with the angular pulses of the position encoder 17 which are emitted at equal angular intervals.
  • the position or reference signal is supplied via a further input 79.
  • a switching command is fed to the microprocessor 57 via a further input 80 as soon as the sewing machine 1 is driven by the drive motor 13.
  • a switching command is given to the microprocessor 57 via an input 81, for example via a knee switch 82 operated by the operator.
  • a signal for a thread cutting process is fed via a further input 83.
  • the microprocessor 57 is followed by a pulse width modulator 84, which in turn is connected to the magnet coil 33 of the electromagnet 34 via an amplifier 85.
  • the magnet coil 33 is guided to ground 87 via a measuring resistor 86. Furthermore, it is led to a current regulator 88, which in turn is fed back to the amplifier 85.
  • the mode of operation is as follows:
  • the digital display fields 61 to 65 light up, the first display field 61, that is to say the 2-digit display, first of the display field displaying a program number # is displayed with an underscore serving as a cursor 89.
  • This cursor 89 indicates which digit can be influenced.
  • the desired digit located above the cursor 89 is increased by turning the rotary pushbutton 52 clockwise or decreased in the counterclockwise direction.
  • the rotary pushbutton 52 is pressed, giving an impulse via the pushbutton switch 58 which, on the one hand, defines the mentioned number, which is stored in the memory 77, and on the other hand the cursor 89 under the jumps to the next possible digit.
  • the first digit of the program number can now be selected. After appropriate selection of this point by turning the knob 52, this is in turn fixed by pressing the knob 52.
  • the sewing program is now selected and defined; the cursor 89 jumps into the second display field 62. Now the display field 62 is activated for the operating mode M, the control mode being selected either by a 1 or the control mode by a corresponding rotation of the knob 52.
  • a leming process takes place as follows:
  • a learning process is carried out in control mode.
  • several test seams are sewn, each with a sufficient number of stitches, e.g. B. must have more than ten stitches.
  • the voltage curve emitted by the thread tension measuring device 67 becomes a setpoint for the controller formed by this measuring device 67, the amplifier 75, the analog-digital converter 76, the microprocessor 57 and the thread tensioning device 32 determined.
  • the last determined such desired value of the voltage curve for the controller and the set current value for the thread tensioning device 32 are stored in the memory 77.
  • the learning phase for the adjustment of a value for the thread tensioning force F1 is thus ended.
  • a second learning phase for the thread tension F2 for a speed n ⁇ n2, for example for a speed n2 2000 min.- 1 , takes place in the same way, whereby again an empirical value for F2 is set for this and then by sewing numerous test seams with the increased speed F2 is detected for such a speed, again a setpoint for the controller is determined from the voltage curve. By pressing button 52, the last determined target value for the controller and the set current value for the controller are accepted and stored. This also completes the adjustment of the value F2.
  • Such a characteristic curve increase value F> which is required when the material to be thickened, is e.g. B. required if, according to FIG. 7, a reinforcement strip 90 is inserted between the two sewing material parts 24, 25.
  • the thread tension force values F are extrapolated linearly. Between n1 and n2, this results in a straight line with increasing speed, which can run downwards, upwards or horizontally.
  • the thread tension values are kept constant below n1 and above n2.
  • the thread tension force is continuously determined by the thread tension force measuring device 67 and reported to the microprocessor 57 and compared there with the stored value, which in turn - if necessary - is readjusted.
  • the control mode is selected as the operating mode, the other manipulated variables F1, F2 and F> are set to a non-changeable, ie equally frozen, state, ie they cannot be changed.
  • a thread tensioning device according to DE 41 41 945 C1 (corresponding to US Pat. No. 5,363,786) can also be used, in which the upper thread is driven by a wheel is performed, which is braked with the help of an electro magnet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Massaging Devices (AREA)
  • Inorganic Insulating Materials (AREA)
EP04005374A 2003-03-21 2004-03-06 Machine à coudre Expired - Lifetime EP1460160B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10312602 2003-03-21
DE10312602A DE10312602A1 (de) 2003-03-21 2003-03-21 Nähmaschine

Publications (2)

Publication Number Publication Date
EP1460160A1 true EP1460160A1 (fr) 2004-09-22
EP1460160B1 EP1460160B1 (fr) 2010-10-06

Family

ID=32798015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04005374A Expired - Lifetime EP1460160B1 (fr) 2003-03-21 2004-03-06 Machine à coudre

Country Status (7)

Country Link
EP (1) EP1460160B1 (fr)
JP (1) JP2004283582A (fr)
KR (1) KR20040083367A (fr)
CN (1) CN1532322A (fr)
AT (1) ATE483840T1 (fr)
DE (2) DE10312602A1 (fr)
TW (1) TW200422464A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2599910A4 (fr) * 2010-07-28 2015-09-02 Nsd Corp Machine à coudre
EP2944716A1 (fr) * 2014-05-16 2015-11-18 BERNINA International AG Dispositif et procédé destinés à influencer la situation de n0euds entre des fils supérieurs et des fils inférieurs lors de la couture au moyen d'une machine à coudre
CN107354610A (zh) * 2017-09-11 2017-11-17 广东溢达纺织有限公司 电子线夹装置及车缝机构

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5408949B2 (ja) * 2008-10-03 2014-02-05 Ｊｕｋｉ株式会社 ミシン
DE202012011059U1 (de) 2012-11-19 2014-02-20 Dürkopp Adler AG Nähmaschine
TWI625440B (zh) * 2017-01-26 2018-06-01 Zeng Hsing Industrial Co Ltd Sewing machine with free seam function
CN110205753B (zh) * 2018-02-28 2022-02-08 兄弟工业株式会社 缝纫机和线张力检测装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793273A (en) * 1984-10-03 1988-12-27 Janome Sewing Machine Co., Ltd. Automatic thread tension device for a sewing machine
DE3843373A1 (de) * 1988-12-23 1990-06-28 Kochs Adler Ag Fadenspannvorrichtung fuer eine naehmaschine
US5237944A (en) * 1988-11-24 1993-08-24 G. M. Pfaff Aktiengesellschaft Stitch-forming machine with a transducer and a control device
DE19921516A1 (de) * 1999-05-10 2000-11-23 G M Pfaff Ag I K Näh- oder Stickmaschine
DE10113945C1 (de) * 2001-03-22 2002-06-13 Duerkopp Adler Ag Verfahren zum Zusammennähen von mindestens zwei Nähgutteilen und Nähmaschine zur Durchführung des Verfahrens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4793273A (en) * 1984-10-03 1988-12-27 Janome Sewing Machine Co., Ltd. Automatic thread tension device for a sewing machine
US5237944A (en) * 1988-11-24 1993-08-24 G. M. Pfaff Aktiengesellschaft Stitch-forming machine with a transducer and a control device
DE3843373A1 (de) * 1988-12-23 1990-06-28 Kochs Adler Ag Fadenspannvorrichtung fuer eine naehmaschine
DE19921516A1 (de) * 1999-05-10 2000-11-23 G M Pfaff Ag I K Näh- oder Stickmaschine
DE10113945C1 (de) * 2001-03-22 2002-06-13 Duerkopp Adler Ag Verfahren zum Zusammennähen von mindestens zwei Nähgutteilen und Nähmaschine zur Durchführung des Verfahrens

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2599910A4 (fr) * 2010-07-28 2015-09-02 Nsd Corp Machine à coudre
EP2944716A1 (fr) * 2014-05-16 2015-11-18 BERNINA International AG Dispositif et procédé destinés à influencer la situation de n0euds entre des fils supérieurs et des fils inférieurs lors de la couture au moyen d'une machine à coudre
CN107354610A (zh) * 2017-09-11 2017-11-17 广东溢达纺织有限公司 电子线夹装置及车缝机构
CN107354610B (zh) * 2017-09-11 2023-07-25 广东溢达纺织有限公司 电子线夹装置及车缝机构

Also Published As

Publication number Publication date
DE10312602A1 (de) 2004-09-30
DE502004011715D1 (de) 2010-11-18
JP2004283582A (ja) 2004-10-14
CN1532322A (zh) 2004-09-29
KR20040083367A (ko) 2004-10-01
EP1460160B1 (fr) 2010-10-06
ATE483840T1 (de) 2010-10-15
TW200422464A (en) 2004-11-01

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