EP1777331B1 - Nähmaschine - Google Patents

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Publication number
EP1777331B1
EP1777331B1 EP06020360A EP06020360A EP1777331B1 EP 1777331 B1 EP1777331 B1 EP 1777331B1 EP 06020360 A EP06020360 A EP 06020360A EP 06020360 A EP06020360 A EP 06020360A EP 1777331 B1 EP1777331 B1 EP 1777331B1
Authority
EP
European Patent Office
Prior art keywords
sewing machine
sensor
hold
thickness
machine according
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.)
Active
Application number
EP06020360A
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German (de)
English (en)
French (fr)
Other versions
EP1777331A1 (de
Inventor
Christoph Heckner
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.)
Filing date
Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP1777331A1 publication Critical patent/EP1777331A1/de
Application granted granted Critical
Publication of EP1777331B1 publication Critical patent/EP1777331B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D05B29/00—Pressers; Presser feet
    • D05B29/02—Presser-control devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/04—Work-feeding means with feed dogs having horizontal and vertical movements arranged above the workpieces
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/28—Applications of servo devices for tool-positioning purposes

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • a sewing machine is known from the EP 1 479 809 A1 , There, the thickness of the sewing material is measured before entering the stitch pattern area.
  • EP 1 739 221 A1 For example, a sewing machine is known having a position sensor for detecting the position of a hold-down foot for holding down cloth.
  • From the DE 30 43 141 A1 is a sewing machine known with a hold-down for holding down fabric, which is driven by a movable linkage displaced.
  • an example of this is the fine adjustment of the thread tension, which depends both on the uncompressed material thickness and on the compressibility of the material to be sewn.
  • Other sewing parameters such as the stroke adjustment of the at least one hold-down foot, the speed of the arm shaft, the stitch length and the fan height can be finely adjusted by evaluating the information of the position sensor on the one hand and the thickness sensor on the other hand.
  • a hold-down foot a presser foot can be used to hold the fabric down in the area of a stitch pattern point or to the fabric during a transport operation in a hold-down position, which also holds down the transport foot.
  • the control device converts into predetermined sewing machine control values, that is, an adaptation of the sewing parameters.
  • a manual conversion or a manual program adjustment is not required. This considerably shortens set-up time when changing over the sewing material. In addition, incorrect settings are avoided. Due to the fine adjustment, a safe material transport can be achieved with minimum pressure, which the hold down feet, ie the presser foot and / or the transport foot, exert on the fabric.
  • a position sensor according to claim 2 is structurally easy to implement. It is used for position detection, the already existing movement of a movable rod for the hold-down. Such a position sensor thus outputs a distance value which is simple can be measured. Alternatively, it is possible to determine the position of a certain component of the movable linkage in space, without using a relative distance measurement for this purpose.
  • a piezoelectric element can be elegantly integrated into the housing.
  • the piezoelectric element is arranged with the arrangement of the fact that in the known sewing machines the pressure exerted on the hold-down foot via the movable linkage depends on the height of the hold-down foot in the hold-down position, ie on the compressed material thickness.
  • An optical sensor can either as a distance sensor or as the absolute position of a component in the space determining sensor, z. B. as a light barrier or light curtain, executed.
  • An ultrasonic sensor according to claim 4 is known for uncompressed fabric thickness measurement from the EP 1 479 809 A1 , With such a sensor, an uncompressed fabric thickness can be detected reliably.
  • An arrangement of the thickness sensor according to claim 5 is particularly compared to the arrangement of the sensor in the EP 1479 809 A1 compact, as it dispenses with a boom.
  • the measuring axis of the thickness sensor In order that the material thickness in the measuring range of the thickness sensor is not yet influenced by the hold-down foot compressing the material, the measuring axis of the thickness sensor must be arranged outside the area of the stitch image location.
  • the sewing speed of the sewing machine can be adapted to the compressed fabric thickness.
  • the sewing speed can therefore be relatively close to that at a certain Fabric strength possible maximum sewing speed are kept, which reduces the overall sewing time.
  • a control device allows an optimization of the thread tension to the respective material thickness. This ensures a clean stitch formation even with high material thicknesses.
  • a control device ensures safe transport while minimizing transport stroke in sewing.
  • the sewing speed can therefore be kept relatively close to a maximum sewing speed which is possible for a given fabric thickness. Overall, this leads to a shortening of the sewing time.
  • a control device ensures a sufficient minimum required fan height. This saves time during operation of the sewing machine, z. As when venting and venting a lifting cylinder used in this context, and allows easy positioning of the material.
  • a control device ensures optimum adaptation of the stitch length to the fabric thickness.
  • a control device ensures a safe transport, while at the same time it is prevented even at high sewing speed that permanent imprints arise on the sewing material.
  • FIG. 4 shows the sewing machine 1 in a schematic representation to illustrate the coupling of mechanical components of a total designated 2 upper transport device. From the basic structure, the sewing machine 1 is known, so that only the components essential to the invention will be explained in detail below.
  • the sewing machine 1 has a C-shaped housing 3. It has a base plate 4 and an upper arm 5. To complete the C-shape, a stand 6 connects the base plate 4 to the arm 5. In the latter, an arm shaft 7 (see Fig. 4) is mounted, which is driven by a motor, not shown. From the rotation of the arm shaft 7 are by mechanical For the drive of the upper transport device 2, whose kinematic structure can be clearly seen in FIG. 4, the arm shaft 7 is non-rotatably connected to an eccentric disk 10. At the latter, a pull rod 11 is hinged, which in turn is pivotally connected to a rocker 12. The latter vibrates about a vibration fixed to the housing 13 about a swing axis parallel to the arm shaft 7. At its end remote from the eccentric pull rod 11 end of the rocker 12 is pivotally connected to a further pull rod 14. The latter carries a permanent magnet 15, which generates a magnetic field with approximately perpendicular to the base plate 4 extending field lines.
  • Figs. 1, 2 and 4 show the upper transport device 2 in a hold-down position for a thick material to be sewn 16, which is referred to below as the first hold-down position.
  • a Hall sensor 17 is directly adjacent to the permanent magnet 15. This sensor is mounted on a boom 18 fixed to the housing. Via a signal line 19, the Hall sensor 17 is connected to a central control device 20 in connection.
  • the magnet pull rod 14 is hinged at its end remote from the rocker 12 at an upper corner in Fig. 4 at a triangular lever 21.
  • Fig. 4 lower left corner of the triangular lever 21 is hinged to a presser foot 22.
  • the presser foot 22 is used for holding down fabric in the area of a stitch image point.
  • a compression spring 24 is supported, the bias of which is adjustable by means of a spring-pressure screw 25.
  • the spring pressure adjusting screw 25 is motorized driven. This drive is connected via a signal line 26 to the control device 20 in connection. With the spring pressure adjusting screw 25 as a motor-driven actuator, the presser foot force is adjusted. This is the force with which the feet 22, 28 hold the fabric 16 in the hold-down position.
  • the right in Fig. 4 lower corner joint of the triangular lever 21 is articulated via a coupling rod 27 at a transport foot 28 for fabric to be sewn.
  • the upper transport device 2 constitutes a movable linkage for the driven displacement of the presser foot 22 and the transport foot 28.
  • the presser foot 22 and the transport foot 28 contribute to the upper transport by releasing them alternately from the holddown position to a raised position for release of the fabric.
  • the position of the presser foot 22 and the transport foot 28 in the raised position is set in the sewing machine 1 via a motor-driven adjusting wheel 29.
  • the control wheel 29 is connected via a signal line 30 to the control device 20 in connection.
  • the sewing machine 1 defines a stitching point.
  • a sewing material conveying direction 31 which runs from right to left in the representation according to FIG. 2, sections belonging to a stitch pattern area 32 still belong to the sewing needle puncture axis, in which an influencing of the material or sewing material 16 by the depressing presser foot 22 on the one hand and the hold down transport foot 28 on the other hand.
  • a measuring axis 33 of a thickness sensor 34 is on the outside Housing 3 mounted in the area of the lower sewing head.
  • the thickness sensor 34 is designed as an ultrasonic sensor. The use of such an ultrasonic sensor for fabric thickness measurement is described in US Pat EP 1 479 809 A1 , The thickness sensor 34 is connected to the central control device 20 via a signal line 35.
  • a first thread tension is set in the sewing machine 1 by a motor-driven actuator 36. The latter is connected via a signal line 37 to the control device 20 in connection.
  • a second yarn tension is set in the sewing machine 1 by a motor-driven actuator 38. The latter is connected via a signal line 39 to the control device 20 in connection.
  • the two set thread tensions can be those acting on the same sewing thread. Alternatively, the two set thread tensions can also act on different sewing threads.
  • a stitch length can be set in the sewing machine 1 via a motor-driven actuator designed as a stitch length adjusting wheel 40.
  • the latter is connected via a signal line 41 to the control device 20 in connection.
  • the control device 20 is connected via a signal line 42 with a motor control 43 in connection, which in turn is in a manner not shown with the drive motor for the arm shaft 7 in signal communication.
  • the latter could be arranged above the triangular lever 21 or also above the drawbar 14.
  • This lifting height stop can have a motor adjusting drive as an actuator, so that the lifting height stop and thus the lifting height for insertion or removal of the sewing material is adjustable.
  • the motor drive of the lifting height stop is in turn connected via a signal line, not shown, with the control device.
  • control values for the spring-pressure set screw 25, the stroke adjustment dial 29, the thread tension actuators 36, 38, the stitch length adjusting wheel 40, the lifting height stop actuator and the motor control 43 are as follows:
  • the presser foot 22 and the transport foot 28 are alternately displaced by the upper transport device 2 between the hold-down position and the raised position.
  • the position of the presser foot 22 and the transport foot 28 depends on the thickness to which the fabric can be compressed.
  • the first holddown position of Figures 1, 2 and 4 shows a relatively thick, e.g. two-ply fabric 16, which can be compressed by the presser foot 22 to about half of its uncompressed thickness.
  • a second hold down position shown in Fig. 3, shows a relatively thin, e.g. single-layer material 16, z. B. leather, which can not be compressed practically. Depending on the fabric quality, even a relatively thick fabric in the holddown position can hardly be compressed.
  • the pull rod 14 is a movable portion of the upper transport device 2, whose distance from the boom 18 in the displacement of the presser foot 22 and the transport foot 28 between the raised position and the holddown position changes steadily. If a relatively thick material is still present in the compressed state, for example in the first hold-down position, the permanent magnet 15 is closer to the Hall sensor 17. The Hall sensor 17 therefore outputs a signal corresponding to the approach of the permanent magnet 15 via the signal line 19 to the control device 20.
  • the permanent magnet 15 is further spaced from the Hall sensor 17, resulting in a sensor signal which corresponds to this lower compressed material thickness.
  • the distance between the Hall sensor 17 and the permanent magnet 15 as a result of the change in distance between the boom 18 and the tie rod 14 changes cyclically during operation of the upper transport device 2.
  • the distance between the Hall sensor 17 and the permanent magnet 15 reaches an extremum.
  • This extremum can be determined by means of a corresponding time-resolved detection of the output value of the Hall sensor 17 by the control device 20.
  • the extremum is uniquely assigned to the position of the presser foot 22 or of the transport foot 28 in the hold-down position. It represents a measure of the thickness of the material or material 16 compressed by the presser foot 22 or the transport foot 28.
  • the uncompressed thickness of the fabric 16 is measured before it reaches the stitch pattern area 32.
  • the thickness sensor 34 first detects this change in fabric thickness. It can then take place in time exactly an adjustment of the thread tension to the increased fabric thickness, since the stitch length on the one hand and the distance A of the measuring axis 33 of the puncture axis of the sewing needle 9 is known. Subsequently, this substance section, the thickness of which has increased, passes through the stitch image area region 32, so that the measurement of the compressed material thickness of this substance section can take place via the Hall sensor 17. If the fabric in this fabric section can be compressed only slightly, it is a hard, dense material which requires a relatively high yarn tension.
  • the thickness sensor 34 measures a higher thickness value than the Hall sensor 17. From these two measurements can by means of the central control device 20 are extrapolated to the actual sewing thickness of the fabric 16. The result is the setting of a thread tension, which is the measured compressibility of the fabric 16 justice. This yarn tension is substantially lower than that which would be adjusted if only the measurement result of the thickness sensor 34 were available, that is, if only the uncompressed fabric thickness of a measurement were accessible. Conversely, the measurement alone via the Hall sensor 17 does not yet provide a sufficient measurement basis for determining the thread tension, since this measurement alone does not provide any information as to whether the substance is actually compressible or not. Only the comparison of both measurements leads to a correct thread tension.
  • the positions of the presser foot 22 and the transport foot 28 in the raised position can also be finely adjusted via the comparison of the measurement results of the thickness sensor 34 on the one hand and the Hall sensor 17 on the other hand.
  • a thickness measurement with the Hall sensor 17 alone would lead to too low a value for the stroke adjustment, since the material is relaxed when lifting the presser foot 22 or the transport foot 28 and thus thicker than in the measuring position of the Hall sensor 17. This effect can be considered by comparison with the measurement result of the thickness sensor 34.
  • the necessary stroke adjustment is in turn extrapolated from the measurement results of the Hall sensor 17 on the one hand and the thickness sensor 34 on the other hand with the aid of the central control device 20.
  • the spring pressure adjusting screw 25 can be adjusted on the basis of the measurement results of the sensors 17, 34, the presser foot force. Since the feet 22, 28 can leave marks on sensitive material 16, the presser foot force must be set as low as possible. With increasing speed and / or increasing lifting height of the feet 22, 28 during transport increases the required presser foot force, which is required to ensure safe transport of the material 16. By evaluating the time course of the signal of the Hall sensor 17 can be determined from when the presser foot force is too low, since then the Periods in which the feet 22, 28 are present in the hold-down position, are too short in time. As soon as such a situation is detected, the presser foot force can be readjusted accordingly by a corresponding default value for the spring pressure adjusting screw 25.
  • the presser foot force automatically increases because the compression spring 24 is compressed more strongly by the additional amount of material thickness. This increase in the material thickness can be detected via the sensors 17, 34 and compensated by appropriate control of the spring pressure set screw 25.
  • the fan height can be specified using the measurement results of the sensors 17, 34 via the lifting height stop actuator.
  • the feet 22, 28 are then raised so far that the fabric 16 can be easily inserted or removed.
  • This fan height adjustment is in turn not possible with the measurement result of the Hall sensor 17, as the uncompressed material thickness is essential for the fan height, which is measured by the thickness sensor 34. It is therefore possible to select the minimum required fan height. This saves time when venting and bleeding a lifting cylinder as part of the top transport 2. Furthermore, an easy positioning of the substance is possible.
  • the position sensor which is formed in the embodiment of FIGS. 1 to 4 by the Hall sensor 17 with the permanent magnet 15 may also be embodied by other sensor types.
  • the position sensor may for example be designed as a capacitive proximity sensor, wherein the boom 18 and the tie rod 14 are parts of a capacitor, whose capacity is measured.
  • the position sensor can also be designed as a piezoelectric element which is arranged between a standing in shear connection with the presser foot 22 component, for example the compression spring 24, and a housing-fixed component of the sewing machine 1, for example, the housing cover 23.
  • the piezoelectric element measures the pressure which the compression spring 24 exerts on the presser foot 22 or the transport foot 28 in the hold-down position. This pressure depends on how much the presser foot 22 or the transport foot 28 are raised in the hold-down position by a correspondingly strong underlying material.
  • the position sensor can also be designed as an optical sensor, for example as a light curtain.
  • the adaptation of the manipulated values to the fabric thicknesses measured by the Hall sensor 17 and the thickness sensor 34 can take place, in particular, without any delay, at compressed material thicknesses which continuously change during the sewing process.
  • this may be, for example, a pneumatic drive, a hydraulic drive, a linear motor or a stepping motor drive.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Inorganic Insulating Materials (AREA)
  • Massaging Devices (AREA)
EP06020360A 2005-10-18 2006-09-28 Nähmaschine Active EP1777331B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005049771A DE102005049771A1 (de) 2005-10-18 2005-10-18 Nähmaschine

Publications (2)

Publication Number Publication Date
EP1777331A1 EP1777331A1 (de) 2007-04-25
EP1777331B1 true EP1777331B1 (de) 2008-01-23

Family

ID=37696096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06020360A Active EP1777331B1 (de) 2005-10-18 2006-09-28 Nähmaschine

Country Status (6)

Country Link
EP (1) EP1777331B1 (ja)
JP (1) JP2007111527A (ja)
KR (1) KR20070042471A (ja)
CN (1) CN1952242A (ja)
AT (1) ATE384813T1 (ja)
DE (2) DE102005049771A1 (ja)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
DE202021101337U1 (de) 2021-03-16 2022-06-20 Dürkopp Adler GmbH Nähmaschine sowie Nachrüst-Bausatz für eine Nähmaschine

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WO2009029019A1 (en) 2007-08-30 2009-03-05 Vsm Group Ab Positioning of stitch data objects
WO2009061258A1 (en) 2007-11-09 2009-05-14 Vsm Group Ab Thread cut with variable thread consumption in a sewing machine
US8606390B2 (en) 2007-12-27 2013-12-10 Vsm Group Ab Sewing machine having a camera for forming images of a sewing area
WO2009157832A1 (en) 2008-06-26 2009-12-30 Vsm Group Ab A mechanically operated presser foot lift arrangement and a sewing machine comprising the arrangement
DE102008030797A1 (de) * 2008-06-28 2009-12-31 Dürkopp Adler AG Nähmaschine sowie Verfahren zum Betrieb einer derartigen Nähmaschine
CN102041644B (zh) 2009-06-01 2014-09-17 Vsm集团股份公司 织构圈夹具
CN102459738B (zh) * 2009-06-11 2013-11-06 Vsm集团股份公司 用于缝纫机的上进料器
DE202011002077U1 (de) 2010-02-11 2011-05-12 Xi'an Typical Europe Gmbh Nähmaschine
JP2011194042A (ja) 2010-03-19 2011-10-06 Brother Industries Ltd ミシン
JP2011194043A (ja) 2010-03-19 2011-10-06 Brother Industries Ltd ミシン
CN102277696B (zh) 2010-06-09 2015-03-11 Vsm集团股份公司 送料器移动补偿
DE102010047091A1 (de) 2010-10-01 2012-04-05 Xi'an Typical Europe Gmbh Nähmaschine
US8960112B2 (en) 2013-02-01 2015-02-24 Vsm Group Ab Stitching system and method for stitch stop embellishments
US9631304B2 (en) 2013-03-15 2017-04-25 Singer Sourcing Limited Llc Variable timing system of a sewing machine and method for selectively adjusting a timing of such a system
CN103866496B (zh) * 2014-03-31 2016-05-25 杰克缝纫机股份有限公司 缝纫机用缝料检测装置及压脚高度自动调节系统
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KR101495010B1 (ko) * 2014-11-10 2015-02-24 조세제 제화용 재봉기의 재봉사 장력 조절장치
DE102015207998B3 (de) * 2015-04-30 2016-08-04 Dürkopp Adler AG Stichlängen-Stellvorrichtung für eine Nähmaschine sowie Nähmaschine mit einer derartigen Stichlängen-Stellvorrichtung
CN106757826B (zh) * 2016-12-22 2022-09-30 浙江中捷缝纫科技有限公司 一种缝纫机压脚的压紧装置
CN106978674A (zh) * 2017-04-22 2017-07-25 浙江美机缝纫机有限公司 缝纫机的自动抬压脚及自动调节压脚压力装置
CN107354601B (zh) * 2017-08-10 2023-03-14 西安标准工业股份有限公司 一种缝纫机调整压脚压力装置及其控制方法
CN110042570A (zh) * 2018-01-16 2019-07-23 杰克缝纫机股份有限公司 一种缝纫机检测控制系统及缝纫机
JP2019130121A (ja) * 2018-01-31 2019-08-08 ブラザー工業株式会社 ミシン
CN108442044B (zh) * 2018-04-25 2024-03-01 标准缝纫机菀坪机械有限公司 一种缝纫机缝料过坎自动感应装置和应用其的缝纫机
DE202018103728U1 (de) * 2018-06-29 2019-10-09 Vorwerk & Co. Interholding Gmbh Nähmaschine für den häuslichen Gebrauch
CN110761005B (zh) * 2018-07-26 2021-02-05 杰克缝纫机股份有限公司 一种基于缝料薄厚检测的缝纫控制方法
CN108914401A (zh) * 2018-10-04 2018-11-30 东莞创辉缝纫机有限公司 一种缝纫机的辅助拉料机构
CN109825965B (zh) * 2019-03-29 2021-05-11 浙江威比玛智能缝制科技有限公司 一种具有压脚压力调节功能的剪线抬压脚机构及缝纫机
CN110306303B (zh) * 2019-07-15 2021-09-07 杰克缝纫机股份有限公司 缝纫机转速调节方法、装置和计算机设备

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202021101337U1 (de) 2021-03-16 2022-06-20 Dürkopp Adler GmbH Nähmaschine sowie Nachrüst-Bausatz für eine Nähmaschine
EP4060106A1 (de) 2021-03-16 2022-09-21 Dürkopp Adler GmbH Nähmaschine sowie nachrüst-bausatz für eine nähmaschine

Also Published As

Publication number Publication date
DE102005049771A1 (de) 2007-04-19
ATE384813T1 (de) 2008-02-15
KR20070042471A (ko) 2007-04-23
DE502006000313D1 (de) 2008-03-13
CN1952242A (zh) 2007-04-25
JP2007111527A (ja) 2007-05-10
EP1777331A1 (de) 2007-04-25

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