EP1847642B1 - Doppelsteppstichnähmaschine - Google Patents

Doppelsteppstichnähmaschine Download PDF

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Publication number
EP1847642B1
EP1847642B1 EP07007047A EP07007047A EP1847642B1 EP 1847642 B1 EP1847642 B1 EP 1847642B1 EP 07007047 A EP07007047 A EP 07007047A EP 07007047 A EP07007047 A EP 07007047A EP 1847642 B1 EP1847642 B1 EP 1847642B1
Authority
EP
European Patent Office
Prior art keywords
thread
sewing machine
securing
rotation
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
EP07007047A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1847642A1 (de
Inventor
Andreas Riffel
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 EP1847642A1 publication Critical patent/EP1847642A1/de
Application granted granted Critical
Publication of EP1847642B1 publication Critical patent/EP1847642B1/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
    • 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
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/06—Loop takers, e.g. loopers for overedge-stitch sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D05B57/265—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices for looptakers with vertical axis

Definitions

  • the invention relates to a lockstitch sewing machine according to the preamble of claim 1.
  • Such a sewing machine is known from the DE 101 17 560 C1 , To prevent rotation in sewing operation direction of rotation is a housing projection of the bobbin case on a housing-fixed spring bar. To prevent rotation of the bobbin case in the opposite direction is another projection of the bobbin case on a cam of a cantilever.
  • This cantilever requires space between the bobbin case and the platen, which is not available for the thread-pulling knife. This requires a complex production, in particular a special hardening of the components arranged in this area, the size of which is very limited.
  • the cantilever requires an additional vertical distance between a platen, are guided by the needle and looper thread and the looper thread feeding the bobbin case, resulting in a threadline still in need of improvement.
  • the cantilever hinders with its anti-rotation stop the threadline especially when the thread-pulling knife is present in a pivoted to a basic position thread detection position.
  • the anti-rotation stop for securing the bobbin case against rotation in the opposite direction directly on the thread-pulling knife.
  • An additional cantilever or web to provide this anti-rotation lock omitted, so that space can be saved, which in turn is the other components in this area of the sewing machine available. Since the second anti-rotation stop is forcibly pivoted with the thread-pulling knife due to the determination on the thread-pulling knife, this second anti-rotation stop is automatically no longer in the way of the thread run in the thread-detecting position of the thread-pulling knife.
  • the coil housing can be with less vertical distance to the support plate can be arranged, which allows shorter after sewing on the fabric remaining yarn ends and also has a positive effect on the yarn path after the cutting process.
  • the position assurance device ensures that the thread-pulling knife can absorb required forces from the bobbin case in the basic position for the rotational security.
  • a second anti-rotation stop according to claim 2 is particularly compact.
  • An opposing approach according to claim 3 ensures that this approach does not interfere with the yarn path.
  • a deflection mechanism ensures that whenever the thread-pulling knife is to be moved into the thread-detecting position via the thread-pulling knife drive, the securing of the thread-pulling knife in the basic position is canceled.
  • a deflection mechanism according to claim 5 comes with advantageously few components and is at the same time reliable.
  • Securing sections according to claim 6 can be produced inexpensively.
  • a thread-pulling knife drive according to claim 7 requires only a small effort.
  • a thread-pulling knife drive according to claim 8 has proven itself in practice.
  • a biasing spring according to claim 9 ensures a return of the deflection mechanism in the securing position.
  • a biasing spring according to claim 10 is inexpensive.
  • the thread-pulling knife has a lengthened and rounded free end section. This prevents that in particular the needle thread in the loop formation is undesirable caught on the thread-pulling knife or other sewing machine components and also ensures that in particular the needle thread does not unwanted wrapped around the thread-pulling knife.
  • This embodiment of the thread-pulling knife with the extended and rounded free end portion is also independent of the design of the anti-rotation device for the bobbin case to prevent disturbance of the threadline of advantage.
  • the thread-pulling knife with the extended and rounded free end portion is therefore an independent from the other sewing machine components advantageous subject of the invention.
  • a lockstitch sewing machine 1 has a base plate 2 with a stand 3 extending upward 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.
  • the needle 10 leads in an eye from a spool 12 via a thread tensioning device and the thread lever 8 supplied needle thread 13th
  • the base plate 2 carries a screw-mounted support plate 14, on which a workpiece 15 rests.
  • the support plate 14 is formed with a recess 16 for the passage of a feed dog 17.
  • 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 coil housing 22 is mounted for receiving a looper thread supply.
  • the gripper 19 is rotatable about a vertical gripper axis 23.
  • a sewing operation direction of rotation 24 runs in Fig. 2 clockwise about the 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 transmission ratio of 1: 2, so that during one revolution of the drive shaft 27, the gripper body 20 located on the shaft 25 turns twice.
  • the drive shaft 27 is drivingly connected to the arm shaft 6 via a belt drive 28.
  • a thread-pulling knife 29 is used to cut off the looper thread.
  • the thread-pulling knife 29 is located between an in Fig. 2 illustrated basic position and a in Fig. 4 shown thread detection position about a parallel to the gripper axis 23 pivot axis 30 pivotally.
  • the thread-pulling knife 29 has one in the view Fig. 2 pronounced of a sickle basic form, the free end in the basic position in the view after Fig. 2 extends around the coil housing 22 around.
  • the stitch hole 18 is adjacent to a detection groove 31 of the thread-pulling knife 29 with a groove-bottom cutting edge 32.
  • the groove 31 is formed in an edge portion 32b of the thread-pulling knife 29 bent at right angles to a horizontally extending body 32a.
  • An extended free end portion 32 c of the thread-pulling knife 29 is in the plan view of the Fig. 2 and 4 executed rounded end.
  • the length of the free end portion 32c of the thread-pulling knife 29 results in that the needle thread 13 does not undesirably wrap around the thread-pulling knife during looping.
  • the rounded shape of the free end portion 32c leads to a trouble-free yarn path of the needle thread 13 and the looper thread.
  • a stationary counter knife 33 Fixed to the base plate 2 on a boom is a stationary counter knife 33, which cooperates to cut the thread when pivoting the thread pulling knife 29 of the Fadener terminates- in the basic position.
  • a holding finger 34th Integrally formed on the coil housing 22 is a holding finger 34th
  • first anti-rotation stop 35 In the sewing operation direction of rotation 24, the spool housing 22 is secured against rotation about the gripper axis 23 by a first anti-rotation stop 35.
  • the latter is designed as an end face of a Kragarms 36 which is fixedly bolted to the base plate 2.
  • a first bobbin case counter-stop 37 At the first anti-rotation stop 35 is located to prevent rotation of the bobbin case 22, a first bobbin case counter-stop 37, which is formed by a first anti-rotation stop 35 facing surface of the retaining finger 34.
  • a second anti-rotation stop 38 In the opposite direction to the sewing operation direction of rotation 24, in the view Fig. 2 that is counterclockwise, the coil housing is secured against rotation about the gripper axis 23 by a second anti-rotation stop 38.
  • the latter is formed by a integrally formed on the free end of the thread pulling knife 29 stop surface, which represents the end face of a lower projection 39, the edge opposite to the second anti-rotation stop 38 without edges in the main body 32a of the thread pulling knife 29.
  • the second anti-rotation stop 38 is thus fixed to the thread-pulling knife 29.
  • the second anti-rotation stop 38 cooperates with a second bobbin case counter-stop 40. This is formed by the first coil housing counter-stop 37 opposite and the second anti-rotation stop 38 facing surface of the retaining finger 34 of the coil housing 22nd
  • the gripper 19 rotates in the sewing operation direction of rotation 24, the abutment of the first anti-rotation stopper 35 on the first bobbin case counter stopper is prevented 37, the bobbin case 22 to rotate with the gripper 19.
  • the gripper 19 rotates in the opposite direction, which may occur during adjustment work on the sewing machine or even when the sewing needle 10 is moved back to a top thread position after a successful thread trimming operation, a maximum clearance between the sewing needle 10 and the platen 14th to adjust for a workpiece 15
  • the installation of the second anti-rotation stopper 38 on the second bobbin case counter-stop 40 prevents the bobbin case 22 from rotating with the gripper 19 in the opposite direction.
  • the thread-pulling knife 29 is secured in the basic position in order to receive a force exerted by the retaining finger 34 on the thread-pulling knife 29 via the stops 40, 38.
  • This securing the thread pulling knife 29 in the basic position makes a position securing device 41, the perspective in the Fig. 5 and their kinematic relationships in the 6 and 7 are shown.
  • the core of the position assurance device 41 is a deflection mechanism 42.
  • the latter has a pivot lever 43 which rotatably via a stationary mounted shaft 44 with the in Fig. 5 not shown thread-pulling knife 29 is connected.
  • the shaft 44 extends coaxially to the pivot axis 30.
  • a hinge connection 45 with the pivot axis 30 parallel hinge axis 46 of the pivot lever 43 is articulated to a locking lever 47.
  • the safety lever 47 is in shear connection with a lifting ram 48 of a thread-pulling knife drive 49.
  • the thread-pulling knife drive 49 which is designed as an electromagnet, serves for displacing, on the one hand, the thread-pulling knife 29 from the basic to the thread-detecting position and, on the other hand, for displacing the position-securing device 41 from one to the other Fig. 5 and 6 shown securing position in a in Fig. 7 shown Release position in which a pivoting of the thread-pulling knife 29 is possible.
  • the safety lever 47 has a latch 50 designed as the first securing portion which is secured in the securing position of the position securing device 41 against a stationary and engaging in the first securing portion 50 second securing portion, which is designed as fixed and fixed to the base plate 2 bolt 51.
  • Fig. 7 shows the disengaged from the pin 51 pawl 50 in the release position of the position assurance device 41st
  • the safety lever 47 and the pivot lever 43 are biased in the securing position of the position assurance device 41 by a biasing spring 52.
  • the latter is designed as a leg spring, one leg 53 of the safety lever 47 and the other leg 54 rests against a pin 55 fixed to the pivot lever 43.
  • the biasing spring 52 is looped between the legs 53, 54 about a pin 55 a, which is fixed to the safety lever 47.
  • Fig. 5 is the cantilever 36 with the first anti-rotation stop 35 only slightly above the bobbin case 22 with the holding finger 34 over.
  • This makes it possible to arrange the coil housing 22 such that only a minimal gap remains between the thread-pulling knife 29 and an upper side of the coil housing 22.
  • This allows an arrangement of the cutting edge 32 very close to the stitch hole 18, so that 15 remaining thread ends are short on the underside of the workpiece 15 after the cutting process.
  • the yarn path of the looper thread and the needle thread 13 in the loop formation by the gripper 19 is improved.
  • the lockstitch sewing machine 1 operates as follows: In the normal sewing operation, the thread-pulling knife 29 is in the home position and the position securing device 41 is in the securing position. Thus, the bobbin case 22 is secured via the anti-rotation stops 35, 38 and the bobbin case counter-stops 37, 40 against rotation about the gripper axis 23 in both directions of rotation. With the help of the gripper 19 takes place in a known manner, the looping and knotting of looper thread and needle thread 13 for lockstitch.
  • the thread-pulling knife drive 49 is actuated, so that the lifting ram 48 extends.
  • the Hubstempel 48 pushes the cam 47a in the representations of 6 and 7 downward.
  • the thrust force of the Hubstempels 48 causes the locking lever 47 to the articulation 45 in the 6 and 7 is pivoted clockwise. This is done against the biasing force of the biasing spring 52, until the lifting ram 48 opposite surface of the locking lever 47 comes into contact with the pivot lever 43.
  • the pawl 50 moves out of the bolt 51 until the position of the deflection mechanism 42 after Fig. 7 is reached.
  • the disengaged position of the second securing portion 51 represents a thread detection drive position, in which a free pivoting of the thread pulling knife 29 from the basic position is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP07007047A 2006-04-21 2007-04-04 Doppelsteppstichnähmaschine Active EP1847642B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006019193A DE102006019193A1 (de) 2006-04-21 2006-04-21 Doppelsteppstichnähmaschine

Publications (2)

Publication Number Publication Date
EP1847642A1 EP1847642A1 (de) 2007-10-24
EP1847642B1 true EP1847642B1 (de) 2011-09-28

Family

ID=38226569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07007047A Active EP1847642B1 (de) 2006-04-21 2007-04-04 Doppelsteppstichnähmaschine

Country Status (6)

Country Link
EP (1) EP1847642B1 (zh)
JP (1) JP2007289691A (zh)
KR (1) KR101395445B1 (zh)
CN (2) CN101058922B (zh)
AT (1) ATE526444T1 (zh)
DE (1) DE102006019193A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7591227B2 (en) * 2007-11-20 2009-09-22 Alberto Landoni Systems and methods for thread handling and/or cutting
TWM365364U (en) * 2009-03-12 2009-09-21 Chee Siang Ind Co Ltd Automatic thread-cutting device of sewing machine
DE102015223194B3 (de) * 2015-11-24 2017-02-23 Dürkopp Adler AG Verfahren zum Erzeugen eines Naht-Anfangsoberfadens mit kurzem Soll-Nahtüberstand sowie Baugruppe zur Durchführung des Verfahrens
DE102017201929A1 (de) 2017-02-08 2018-08-09 Dürkopp Adler AG Doppelsteppstich-Nähmaschine sowie Verfahren zur Erzeugung eines Naht-Anfangsoberfadens mit einem geringen Soll-Nahtüberstand
DE102017207627A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2616738C3 (de) * 1976-04-15 1979-03-29 Duerkoppwerke Gmbh, 4800 Bielefeld Doppelsteppstich-Nähmaschine mit umlaufendem Greifer
DE2909659C2 (de) * 1979-03-12 1987-04-30 Kochs Adler Ag, 4800 Bielefeld Doppelsteppstich-Nähmaschine mit einer Einrichtung zum Ergänzen des Unterfadenvorrates
DE3208159C2 (de) * 1982-03-06 1984-03-01 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Fadenschneideeinrichtung an Doppelsteppstich-Nähmaschinen
DE8437343U1 (de) * 1984-12-20 1986-09-18 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Doppelsteppstichnähmaschine mit einem Greifer
CN2234963Y (zh) * 1995-04-08 1996-09-11 顾飞龙 链形缝法缝纫机用的切线器
JP4199375B2 (ja) * 1999-05-07 2008-12-17 Ｊｕｋｉ株式会社 ミシンの制御装置
DE10035819C1 (de) * 2000-07-22 2001-11-15 Duerkopp Adler Ag Greifer für eine Doppelsteppstich-Nähmaschine mit einer Fadenabschneidvorrichtung
CN1097651C (zh) * 2000-09-08 2003-01-01 高林股份有限公司 缝纫机的上叉线切线装置
DE10117560C1 (de) * 2001-04-07 2002-07-25 Duerkopp Adler Ag Doppelsteppstichnähmaschine mit einer Drehsicherung für ein Spulengehäuse
DE10123075C1 (de) * 2001-05-11 2002-10-10 Duerkopp Adler Ag Doppelsteppstichnähmaschine mit einer Fadenabschneidvorrichtung
JP2004073239A (ja) * 2002-08-09 2004-03-11 Hashima:Kk 縫製機における下糸供給管理装置
DE102004016836B3 (de) * 2004-04-01 2005-05-25 Dürkopp Adler AG Nähmaschine
CN2734800Y (zh) * 2004-09-22 2005-10-19 张家港伸兴机电有限公司 缝纫机的下线切断装置

Also Published As

Publication number Publication date
CN101058922B (zh) 2012-05-09
DE102006019193A1 (de) 2007-10-25
CN101058922A (zh) 2007-10-24
JP2007289691A (ja) 2007-11-08
CN101058926A (zh) 2007-10-24
CN101058926B (zh) 2012-08-08
ATE526444T1 (de) 2011-10-15
EP1847642A1 (de) 2007-10-24
KR101395445B1 (ko) 2014-05-14
KR20070104237A (ko) 2007-10-25

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