EP3360994A1 - Machine à coudre à point double ainsi que procédé d'obtention d'un fil supérieur de début de couture à faible surplomb - Google Patents

Machine à coudre à point double ainsi que procédé d'obtention d'un fil supérieur de début de couture à faible surplomb Download PDF

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Publication number
EP3360994A1
EP3360994A1 EP18153113.8A EP18153113A EP3360994A1 EP 3360994 A1 EP3360994 A1 EP 3360994A1 EP 18153113 A EP18153113 A EP 18153113A EP 3360994 A1 EP3360994 A1 EP 3360994A1
Authority
EP
European Patent Office
Prior art keywords
upper thread
thread
detecting means
starting
sewing machine
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Withdrawn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
EP18153113.8A
Other languages
German (de)
English (en)
Inventor
Pavel Vybihal
Pavel Matejcek
Radomir Humplik
Lubomír Jasek
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 EP3360994A1 publication Critical patent/EP3360994A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/08—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
    • D05B1/12—Lock-stitch seams
    • 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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/06—Devices for severing the needle or lower thread and for disposing of the severed thread end ; Catching or wiping devices for the severed thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices
    • D05D2207/04—Suction or blowing devices

Definitions

  • the invention relates to a lockstitch sewing machine. Furthermore, the invention relates to a method for producing a seam beginning upper thread of a seam to be formed in the fabric with a nominal seam projection of at most 10 mm with such a sewing machine.
  • Sewing machines are known from the EP 1 847 641 B1 , of the DE 102 34 251 C1 , of the DE 10 2006 019 193 A1 and the DE 101 23 075 C1 ,
  • an upper thread starting portion detecting means convertible between a neutral position, an upper thread detecting position and a upper thread clamping position offers the possibility of positioning and fixing the upper thread starting portion defined at the beginning of each seam forming operation for a subsequent cutting operation.
  • This makes it possible to cut off the upper thread starting section very short, so that at the beginning of the seam only a short seam top thread remains, resulting in a visually clean seam pattern.
  • the initial thread knife may serve at the same time for cutting off a lower thread starting section.
  • a lower thread starting portion detecting means may be provided.
  • the latter can be formed by a thread-pulling knife and a counter-clamping body associated therewith.
  • a reversing trajectory of the upper thread detecting means may be on the side of the seam from which a lower thread is fed to the seam at the time of sewing.
  • a sewing process can be controlled so that a first stitch of the seam is executed as compared to the other stitches short stitch, so as a short stitch.
  • the detection position and the clamping position may be different positions of the upper thread starting portion detecting device.
  • the upper thread starting portion detecting means may be a device separate from the starting thread knife.
  • An upper thread detection fork according to claim 2 has been found to be particularly suitable for securely positioning the upper thread starting portion in the upper thread detection position.
  • a fixedly attached to a lower feed dog cutting edge according to claim 3 has been found to be particularly suitable for the formation of a short seam top thread.
  • the initial thread knife then cuts with very little decency to the beginning of the seam.
  • An embodiment according to claim 4 is particularly suitable for the formation of a short upper thread beginning.
  • the main body portion with the cutting edge may be hardened compared to the other sub-feed.
  • a thread-pulling knife according to claim 5 enables automated cutting of the upper thread and the lower thread at the seam end and also allows short and not or little protruding thread remnants there.
  • a changeover device makes it possible to move the upper thread-beginning portion detection device on the one hand and the thread-pulling knife on the other hand synchronously to each other via the jointly driven part of the movement sequence. In this way, for example, the thread-starting portions can be released at the same time for cutting the threads at the seam end of the respective clamping position.
  • a cam control according to claim 7 results in a precise movement control of the upper thread starting portion detecting means.
  • Another curve control can be provided for a changeover movement of the thread-pulling knife.
  • the curves of these two cam controls can be rotatable about a common axis of rotation.
  • the at least one cam control can have an associated lifting cylinder. This may be a solenoid or a pneumatic cylinder.
  • a detent according to claim 8 leads to a secure positioning of the upper thread-beginning portion detecting means in the neutral position.
  • a corresponding detent can also be provided for the thread-pulling knife.
  • a suction device ensures safe disposal of the cut upper thread residue.
  • a lockstitch sewing machine 1 has a machine frame 1a having a base plate 2 with a stand 3 extending therefrom and an angled arm 4. The latter ends in a head 5.
  • an arm shaft 6 is rotatably supported.
  • the crank mechanism 7 is drivingly connected to a needle bar 9 mounted axially displaceably in the head 5. This has at its lower end a needle 10.
  • the needle 10 is moved up and down by the crank mechanism 7 on a vertical axis 11.
  • a Cartesian xyz coordinate system is used below.
  • the vertical axis 11 extends along the z-direction of this coordinate system.
  • the x-direction is perpendicular to the plane of the Fig. 1 into it and runs parallel to a sewing direction of the sewing machine 1.
  • the y-direction runs in the Fig. 1 to the left.
  • the needle 10 leads in an eye of a needle thread supply in the form of a coil 12 via a thread tensioning device and the thread lever 8 supplied needle thread 13, which is also referred to as needle thread.
  • the needle thread 13 has a free upper thread starting section 13a.
  • the base plate 2 carries a screw-mounted support plate 14, on which a workpiece 15 rests.
  • a designed as a stitch plate 16 section of the support plate 14 is formed with a recess for the passage of a lower feed dog 17, which is also referred to as sub-feed.
  • the latter has a tap hole 18 for the passage of the needle 10.
  • the feed dog 17 is in a known manner in drive connection with a arranged below the base plate 2 thrust and screw jack.
  • a gripper 19 having a gripper body 20 with a gripper tip 21.
  • a cup-shaped bobbin case for receiving a looper thread supply stored in the form of a coil 22 or a thread winding.
  • the coil 22 serves as a lower thread supply.
  • the looper thread is also called bobbin thread.
  • the gripper 19 is a stitch forming tool.
  • the needle 10 serves for the upper thread guide.
  • the gripper 19 serves to wrap around the upper and lower thread.
  • the gripper 19 is rotatable about a vertical, in the z-direction gripper axis 23.
  • the gripper body 20 is fixedly connected to a shaft 25 which is coaxial with the gripper axis 23.
  • the shaft 25 is rotatably mounted in a bearing block 26 screwed to the base plate 2.
  • a drive shaft 27 is mounted, which is connected to a arranged in the interior of the bearing block 26 gear transmission.
  • the gear transmission has a gear ratio of 1: 2, so that in one revolution of the drive shaft 27 located on the shaft 25 gripper body 20 rotates twice.
  • the drive shaft 27 is drivingly connected to the arm shaft 6 via a belt drive 28.
  • thread-pulling knife 29 For cutting the needle thread 13 and the hook thread at the seam end is used, for example, in Fig. 2 shown thread-pulling knife 29, for example, in a similar form from the EP 1 847 641 B1 is known.
  • the thread-pulling knife 29 is fixedly connected to a hollow shaft 29a.
  • the thread-pulling knife 29 is rotatably mounted in the bearing block 26.
  • the sewing machine 1 For holding and transporting the workpiece part 15, the sewing machine 1 additionally has a presser foot 30a and an upper feed dog 31a, which cooperates with the lower feed dog 17 for the material to be transported.
  • presser foot 30a / upper feed dog 31 a are in the Fig. 1 indicated only schematically.
  • the sewing machine 1 has an example in the Fig. 2 illustrated upper thread starting portion detecting means 30th
  • the latter is changeable between, for example, in the Fig. 2 shown neutral position and one for example in the Fig. 4 shown upper thread clamping position arranged.
  • the upper thread starting portion 13a is interposed between the upper thread starting portion detecting means 30 and a counter-clamping body 31 (see FIG. Fig. 5 ) clamped.
  • the counter-clamping body 31 simultaneously represents a bobbin case holder for the coil housing 22.
  • An upper thread detecting means of the upper thread starting portion detecting means 30 is constituted by an upper thread detecting fork 32 having two prongs 32a, between which, in the upper thread detecting position, the upper thread starting portion 13a is guided. Between the neutral position and the upper thread clamping position of the upper thread starting portion detecting means 30, there is still an upper thread detecting position in which the upper thread starting portion 13a is grasped by the upper thread detecting means 32.
  • the upper thread starting portion detecting means 30 is rotatably connected to a shaft 32b, which runs in the hollow shaft 29a and in the Fig. 2 indicated by dashed lines.
  • the shaft 32b is rotatably supported in the hollow shaft 29a.
  • the sewing machine 1 further has a starting thread cutter 33 (see FIG. Fig. 8 ) for cutting off the upper thread starting portion 13a.
  • the upper thread starting section 13a is severed in this cutting between an upper thread rest 13aa (see, for example, FIG Fig. 12 ) and a needle thread-remaining supernatant portion 13ab remaining on the seam side (see FIG. Fig. 13 ), which is also referred to as a seam top thread.
  • the initial thread cutter 33 has a blade 34 fixedly attached to the bottom feed dog 17 which is an integral part thereof.
  • the cutting edge 34 is formed by a bottom-side edge of a body portion 36 of the conveyor 17 which is elongated in the sewing direction.
  • the initial thread cutter 33 simultaneously serves to cut off a lower thread starting portion of the lower thread 36.
  • a lower thread starting portion detecting means for this lower thread starting portion 36a (see FIG. Fig. 2 ) is formed by the thread-pulling knife 29, which clamps in the clamping position, which simultaneously represents a lower thread-detecting position, the lower thread starting portion 36 a against a counter-clamping body in the form of a lower thread clamping spring 37.
  • This lower thread clamp spring 37 is more in detail in the Fig. 12 shown.
  • Pivot axis 38 is also a pivot axis for the conversion of the thread-pulling knife 29th
  • a changeover means For switching the upper thread-beginning portion detecting means 30 between the neutral position and the upper thread clamping position on the upper thread detection position is a changeover means, which includes a solenoid 39 and a cam control for a Umstelliolo the upper thread-beginning portion detecting means 30.
  • Fig. 6 shows details of this changeover device for the upper thread starting portion detecting means 30.
  • the cam control for the changeover means comprises a roller 40 which is attached to the free end of a lifting piston of the lifting magnet 39.
  • the roller 40 is in the Fig. 6 is shown in an engaged position in which it is engaged with a Umstell-curve 41 for controlling the Umstellterrorism the upper thread-beginning portion detecting means 30.
  • the Umstell-curve 41 is as a peripheral portion of a rotary body 42 (see FIG. Fig. 11 ), which is driven via the drive shaft 27.
  • the engagement position of the roller 40 is present when activated solenoid 39. In the off state of the solenoid 39, the roller 40 is retracted and not with the Umstell curve 41 in engagement.
  • the upper thread starting portion detecting means 30 is secured via a latch having a catch 43 (see FIG. Fig. 3 ), which is rotatably connected about the pivot axis 38 with the upper thread-beginning portion detecting means 30, and with a partially complementary to the latch 43 shaped leaf spring 44, in which the detent 43 is engaged.
  • the in the Fig. 3 shown detent position of the catch 43 in the leaf spring 44 can by the activated changeover be overcome, such as a comparison with the Fig. 7 shows.
  • the thread-pulling knife 29 is also secured via a further latching device with a relative to the pivoting about the pivot axis 38 rotatably connected to the thread-pulling knife 29 latch 45 (see. Fig.
  • the roller 40 of the upper thread starting portion detecting means changing device 30 is supported in a portion of the detent 43, which in turn is non-rotatably connected to the turn control shaft 29a of the upper thread starting portion detecting means 30 (see FIG. Fig. 2 and 6 ).
  • Another switching device is used to switch the thread pulling knife 29 between its neutral position and its cutting position.
  • This thread-pulling knife changeover means include a further solenoid 47a and a connected to the thread-pulling knife 29 lever 48, which in turn carries a roller not shown, in turn, with a Umstell curve 49 (see. Fig. 11 ) Can be brought into engagement for the Umstelldoch of the thread pulling knife.
  • the lever 48 is rotatably connected to the hollow shaft 29 a (see. Fig. 2 ).
  • the Umstell curve 49 also represents a peripheral peripheral portion of the rotating body 47.
  • the two Umstell curves 41 and 49 for the Umstellterrorism the upper thread-start portion detection means 30 on the one hand and for the thread-pulling knife 29 on the other hand rotate about a common axis of rotation 50 (see , Fig. 11 ).
  • solenoid 47a When activated to change the thread pulling knife 29 in the cutting position solenoid 47a is the lever 48 of the changeover to Conversion of the thread-pulling knife 29 force-transmitting to a boom 51 of the catch 43 of the changeover device for the upper thread-beginning portion detecting means 30 at.
  • a movement of the upper thread-start portion detecting means 30 is driven by a drive of the thread-pulling knife 29, so that both are shifted together around the pivot axis 38 synchronously in the same pivoting direction.
  • the inlet opening 53 in the Fig. 12 is shown in dashed lines.
  • the suction device 52 has a vacuum source 54, which in the Fig. 12 is shown only schematically.
  • the sewing machine 1 To produce a seam beginning upper thread of a seam 55 to be formed in the sewing material (cf. Fig. 13 ) with a target seam projection A of the upper thread starting protrusion portion 13ab of at most 10 mm, the sewing machine 1 operates as follows:
  • a leading portion of the upper thread 13 including the upper thread starting portion 13a is transported with the sewing needle 10 through the fabric 15 from a fabric top side toward the bottom of the fabric. This is in the Fig. 1 . 2 and 4 shown.
  • the gripper tip 21 of the gripper 19 thereby detects an upper thread loop formed in this leading upper thread section and pulls the upper thread starting section 13a out until the entire upper thread starting section 13a under the sewing material underside lies. This situation is in the Fig. 5 shown.
  • the upper thread-starting-portion detecting device 30 becomes different from that in FIG Fig.
  • a changeover trajectory of the upper thread detecting means 32 that is, the changeover of the upper thread starting portion detecting means 30 between the neutral position, the upper thread detecting position and the upper thread clamping position, runs on the side of the seam from which the lower thread 36 is fed to the seam 55 becomes.
  • the lower thread starting portion 36a is also clamped and thus fixed due to the clamping by the thread pulling knife 29 against the lower thread clamping spring 37.
  • stitches S 2 , ... S u are then stitched with a normal, larger stitch length.
  • the sewing material 15 is transported in the sewing direction x with the bottom feed dog 17.
  • the two initial thread portions that is, the upper thread starting portion 13a and the lower thread starting portion 36a, are tensioned between their respective clamping and the seam beginning.
  • the two beginning sections 13a, 36a are, as soon as they are sufficiently taut, guided over the cutting edge 34 of the bottom conveyor 17 and, as soon as the transport thread tension is sufficiently large, cut by the cutting edge 34.
  • a cooperating with the cutting edge 34 counter blade is not required here, but can be used.
  • Both thread starting sections 13a, 36a are cut off very close to the beginning of the seam 55 due to the cut directly on the bottom feed dog 17, so that a very short top thread starting projection section 13ab (cf. Fig. 13 ) with a desired seam projection A of at most 10 mm remains.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP18153113.8A 2017-02-08 2018-01-24 Machine à coudre à point double ainsi que procédé d'obtention d'un fil supérieur de début de couture à faible surplomb Withdrawn EP3360994A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017201929.8A DE102017201929A1 (de) 2017-02-08 2017-02-08 Doppelsteppstich-Nähmaschine sowie Verfahren zur Erzeugung eines Naht-Anfangsoberfadens mit einem geringen Soll-Nahtüberstand

Publications (1)

Publication Number Publication Date
EP3360994A1 true EP3360994A1 (fr) 2018-08-15

Family

ID=61024621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18153113.8A Withdrawn EP3360994A1 (fr) 2017-02-08 2018-01-24 Machine à coudre à point double ainsi que procédé d'obtention d'un fil supérieur de début de couture à faible surplomb

Country Status (6)

Country Link
EP (1) EP3360994A1 (fr)
JP (1) JP2018126505A (fr)
KR (1) KR20180092292A (fr)
CN (1) CN108396467A (fr)
DE (1) DE102017201929A1 (fr)
TW (1) TW201833404A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020207769A1 (fr) 2019-04-12 2020-10-15 Pfaff Industriesysteme Und Maschinen Gmbh Machine à coudre comprenant un bloc de doigts à fil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112030382A (zh) * 2020-09-27 2020-12-04 徐来军 一种高效的长布料加工用工业缝纫装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312136A1 (de) * 1973-03-12 1974-09-19 Hans Dohm Fadenabschneider fuer naehmaschinen
US4187793A (en) * 1977-09-22 1980-02-12 Rockwell-Rimoldi, S.P.A. Automatic stitch cutting device
DE4110684C1 (fr) * 1991-04-03 1992-05-27 Duerkopp Adler Ag, 4800 Bielefeld, De
DE19722395C1 (de) * 1997-05-28 1998-08-06 Pfaff Ag G M Nähmaschine mit einer Fadenschneideinrichtung
DE10035819C1 (de) * 2000-07-22 2001-11-15 Duerkopp Adler Ag Greifer für eine Doppelsteppstich-Nähmaschine mit einer Fadenabschneidvorrichtung
DE102007045597A1 (de) * 2006-09-15 2008-04-03 Juki Corp., Chofu Nähmaschine
EP2206816A1 (fr) * 2009-01-09 2010-07-14 Dürkopp Adler AG Machine à coudre à deux aiguilles
US20100175602A1 (en) * 2009-01-09 2010-07-15 Zeng Hsing Industrial Co., Ltd. Thread cutting device for a sewing machine
EP2644764A1 (fr) * 2012-03-29 2013-10-02 Dürkopp Adler AG Composant coupe-fil pour machine à coudre des boutonnières à oeillet
EP2692925A1 (fr) * 2012-08-01 2014-02-05 Dürkopp Adler AG Couteau à tirer le fil pour une machine à coudre, module de coupe de fil et machine à coudre dotée d'un tel couteau à tirer le fil

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10123075C1 (de) 2001-05-11 2002-10-10 Duerkopp Adler Ag Doppelsteppstichnähmaschine mit einer Fadenabschneidvorrichtung
DE10234251C1 (de) 2002-07-27 2003-10-09 Duerkopp Adler Ag Verfahren zum Ziehen des freien Fadenendes eines Nadelfadens von der Oberseite eines Nähgutteils auf dessen Unterseite und Nähmaschine zur Durchführung des Verfahrens
DE102006019193A1 (de) 2006-04-21 2007-10-25 Dürkopp Adler AG Doppelsteppstichnähmaschine
DE202006009410U1 (de) 2006-04-21 2007-08-30 Dürkopp Adler AG Fadenziehmesser für eine Nähmaschine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312136A1 (de) * 1973-03-12 1974-09-19 Hans Dohm Fadenabschneider fuer naehmaschinen
US4187793A (en) * 1977-09-22 1980-02-12 Rockwell-Rimoldi, S.P.A. Automatic stitch cutting device
DE4110684C1 (fr) * 1991-04-03 1992-05-27 Duerkopp Adler Ag, 4800 Bielefeld, De
DE19722395C1 (de) * 1997-05-28 1998-08-06 Pfaff Ag G M Nähmaschine mit einer Fadenschneideinrichtung
DE10035819C1 (de) * 2000-07-22 2001-11-15 Duerkopp Adler Ag Greifer für eine Doppelsteppstich-Nähmaschine mit einer Fadenabschneidvorrichtung
DE102007045597A1 (de) * 2006-09-15 2008-04-03 Juki Corp., Chofu Nähmaschine
EP2206816A1 (fr) * 2009-01-09 2010-07-14 Dürkopp Adler AG Machine à coudre à deux aiguilles
US20100175602A1 (en) * 2009-01-09 2010-07-15 Zeng Hsing Industrial Co., Ltd. Thread cutting device for a sewing machine
EP2644764A1 (fr) * 2012-03-29 2013-10-02 Dürkopp Adler AG Composant coupe-fil pour machine à coudre des boutonnières à oeillet
EP2692925A1 (fr) * 2012-08-01 2014-02-05 Dürkopp Adler AG Couteau à tirer le fil pour une machine à coudre, module de coupe de fil et machine à coudre dotée d'un tel couteau à tirer le fil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020207769A1 (fr) 2019-04-12 2020-10-15 Pfaff Industriesysteme Und Maschinen Gmbh Machine à coudre comprenant un bloc de doigts à fil
DE102019205303A1 (de) * 2019-04-12 2020-10-15 Pfaff Industriesysteme Und Maschinen Gmbh Fadenfinger-Baugruppe für eine Nähmaschine
CN113710844A (zh) * 2019-04-12 2021-11-26 普法夫工业系统与机器公司 具有导线销组件的缝纫机
CN113710844B (zh) * 2019-04-12 2024-03-05 普法夫工业系统与机器公司 具有导线销组件的缝纫机

Also Published As

Publication number Publication date
DE102017201929A1 (de) 2018-08-09
KR20180092292A (ko) 2018-08-17
CN108396467A (zh) 2018-08-14
TW201833404A (zh) 2018-09-16
JP2018126505A (ja) 2018-08-16

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