EP0371922B1 - Machine à coudre - Google Patents

Machine à coudre Download PDF

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Publication number
EP0371922B1
EP0371922B1 EP89810885A EP89810885A EP0371922B1 EP 0371922 B1 EP0371922 B1 EP 0371922B1 EP 89810885 A EP89810885 A EP 89810885A EP 89810885 A EP89810885 A EP 89810885A EP 0371922 B1 EP0371922 B1 EP 0371922B1
Authority
EP
European Patent Office
Prior art keywords
thread
machine according
needle
abutment
lower thread
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.)
Expired - Lifetime
Application number
EP89810885A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0371922A1 (fr
Inventor
Antonio Jimenez
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.)
Mefina SA
Original Assignee
Mefina SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mefina SA filed Critical Mefina SA
Publication of EP0371922A1 publication Critical patent/EP0371922A1/fr
Application granted granted Critical
Publication of EP0371922B1 publication Critical patent/EP0371922B1/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
    • D05B55/00—Needle holders; Needle bars
    • 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
    • D05B57/143—Vertical axis type
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B61/00—Loop holders; Loop spreaders; Stitch-forming fingers

Definitions

  • Sewing machines comprising a needle holder bar and means for imparting it back and forth longitudinal movements, means for fixing a needle on this bar and for feeding the thread thereof. , a loop sensor for gripping the upper thread brought by the needle and passing it around a bobbin, the lower thread of which then passes through this loop to form a stitch, a conveyor mechanism for moving the fabric to be sewn d 'A stitch made at the next point to be made, means being provided to relax the thread from the bobbin, during each stitch formation.
  • Such a machine is known from US Pat. No. 4,182,250 and comprises, as means for relaxing the thread, a rocker pivotally mounted on a part screwed onto the frame of the sewing machine. This rocker is actuated by the transport claw on the move and pulls each time the transport claw comes and goes on the lower wire to relax it.
  • the subject of the invention is a sewing machine of the aforementioned kind, in which other means are provided for relaxing the lower thread, means which make it possible to achieve greater efficiency with simpler construction.
  • the machine is characterized in that said means comprise an actuating member elastically mounted on a moving part of the conveyor mechanism and cooperating, during movements of the moving part, by a first part, with a stationary stop, said actuator capable of coming into contact through a second part with the lower thread coming from the bobbin during each cycle of the conveyor mechanism to exert traction on the lower thread and give slack to this thread.
  • the invention makes it possible to obtain means for relaxing the wire of great efficiency and of a very simple construction, therefore of a reduced cost price.
  • Figure 1 is a cross section of the lower arm of a sewing machine, showing part of the conveyor mechanism and the loop sensor according to this embodiment.
  • Figure 2 is a partial section of Figure 1, in which the carrier's claw occupies another position, along line II-II of FIG. 3.
  • Figure 3 is a top view of the carrier's claw.
  • Figure 4 is an end view of the claw.
  • Figure 5 is a section substantially similar to Figure 2 and illustrates the alternative embodiment.
  • the lower arm 1 of a sewing machine is hollowed out and contains a loop sensor 2 forming part of a bowl 3 driven in rotation by a motor shaft 4 carrying a tangent screw 5 meshing with a wheel toothed 6 secured to the bowl 3.
  • the bowl 3 contains a spool of wire or bobbin, not shown, which is carried in a capsule 7, retained by well-known means so as not to be driven in rotation by the bowl 3.
  • the thread 8 from the bobbin passes under a tension spring 9 to feed the seam 10 of the fabrics 11.
  • the machine usually comprises a needle bar 12 provided with a needle 13, through the eye of which the upper thread 14 passes.
  • the machine also comprises a presser foot 15 pressed against the fabric by a rod 16 subjected to the action of a spring not shown.
  • This transport claw 17 is located under a needle plate 18, which, as shown in FIG. 3, has slots 19, only one of which is visible in the drawing, for the passage of the two toothed parts 20 of the claw 17.
  • This claw 17 is provided with a member intended to relax the thread of the bobbin, during each cycle of the conveyor mechanism.
  • This member is constituted by an elastic steel wire 21 in the general shape of a U, the rear end of the branches of which is curved at 22 to be stowed in a part of the claw 17.
  • each of the branches of the U passes through a hole in a shoe 23, sliding in a vertical branch of the shoe 17.
  • each shoe 23 comes to abut under the needle plate 18, as shown in FIG. 1, which deforms down the steel wire 21, which thus exerts a tension on the wire 8.
  • the thread is then relaxed, as shown in FIG. 2, which facilitates the entrainment of the lower thread inside the materials to be sewn, under the effect of the traction exerted by the upper thread 14, this whatever the sewing speed.
  • the length of the thread which is relaxed in each cycle, is a function of the horizontal distance traveled by the claw while the steel wire 21 acts on the wire 8. This gives a slack which increases substantially depending on the stitch length chosen.
  • the transverse branch 24 of the steel wire 21 has a bent shape which is intended to vary the amount of slack depending on the lateral position of the wire 8 in the case where the machine is scheduled to perform zigzag stitches.
  • bent shape of the steel wire must be adapted according to the general geometry of the machine, in particular the starting position of the lower wire 8 when it leaves the spring 9 relative to the position of this wire in the seam 10.
  • the needle plate 18 is replaced by a needle plate 25 having an inclined lower surface forming a ramp.
  • the deflection of the wire 21 depends on the longitudinal position of the claw 17 of the conveyor and therefore therefore, on the length of stitches selected for sewing.
  • a similar effect could be obtained by providing a needle plate having different support levels for the two pads. These last two could also be replaced by a transverse pin connecting the two parallel branches of the U.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP89810885A 1988-11-29 1989-11-20 Machine à coudre Expired - Lifetime EP0371922B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4431/88A CH676478A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1988-11-29 1988-11-29
CH4431/88 1988-11-29

Publications (2)

Publication Number Publication Date
EP0371922A1 EP0371922A1 (fr) 1990-06-06
EP0371922B1 true EP0371922B1 (fr) 1993-07-28

Family

ID=4275999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810885A Expired - Lifetime EP0371922B1 (fr) 1988-11-29 1989-11-20 Machine à coudre

Country Status (15)

Country Link
US (1) US5048438A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0371922B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPH02182289A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
KR (1) KR900008095A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CN (1) CN1024207C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU621420B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BR (1) BR8906016A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA2004054A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH676478A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DD (1) DD289783A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE68907867T2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES2042064T3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
PT (1) PT92418B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
RU (1) RU1834935C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ZA (1) ZA898422B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4124384B2 (ja) 1998-05-15 2008-07-23 富士フイルム株式会社 磁気テープカートリッジ
JP2002177675A (ja) * 2000-12-11 2002-06-25 Morimoto Mfg Co Ltd ゴム糸縫付けミシン
JP3795766B2 (ja) * 2001-04-17 2006-07-12 ペガサスミシン製造株式会社 ２本針オーバーロックミシン
DE102013111794A1 (de) * 2013-10-25 2015-04-30 Airbus Defence and Space GmbH Wiederholungseinheit, Vielnadelmaschine und Verfahren zur Herstellung von verstärkten Materialien

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164113A (en) * 1963-05-14 1965-01-05 Singer Co Bobbin thread pull-off for sewing machines
US3467039A (en) * 1967-11-20 1969-09-16 Singer Co Work feeding mechanisms for sewing machines
US4182250A (en) * 1979-02-02 1980-01-08 The Singer Company Bobbin thread control means for a lock stitch sewing machine
US4215639A (en) * 1979-02-02 1980-08-05 The Singer Company Selectively controllable bobbin thread pull-off mechanism
JPS561193A (en) * 1979-06-20 1981-01-08 Janome Sewing Machine Co Ltd Regulator for cotton clamping in final sewing machine
US4437421A (en) * 1980-11-06 1984-03-20 The Singer Company Variable pull off for bobbin thread
US4399761A (en) * 1981-07-13 1983-08-23 The Singer Company Resilient bobbin thread pull-off member for lockstitch sewing machine
JPS59118190A (ja) * 1982-12-27 1984-07-07 蛇の目ミシン工業株式会社 ジグザグミシンにおける下糸たるみ量調節装置
JPH0632730B2 (ja) * 1984-08-31 1994-05-02 蛇の目ミシン工業株式会社 糸調子設定ミシン
JPS61268292A (ja) * 1985-05-23 1986-11-27 蛇の目ミシン工業株式会社 ミシンの上下糸調節装置

Also Published As

Publication number Publication date
DE68907867T2 (de) 1994-01-27
AU621420B2 (en) 1992-03-12
PT92418A (pt) 1990-05-31
CN1024207C (zh) 1994-04-13
DD289783A5 (de) 1991-05-08
ZA898422B (en) 1990-06-27
US5048438A (en) 1991-09-17
DE68907867D1 (de) 1993-09-02
CA2004054A1 (fr) 1990-05-29
AU4559789A (en) 1990-06-07
CN1043168A (zh) 1990-06-20
JPH02182289A (ja) 1990-07-16
BR8906016A (pt) 1990-06-19
EP0371922A1 (fr) 1990-06-06
ES2042064T3 (es) 1993-12-01
KR900008095A (ko) 1990-06-02
RU1834935C (ru) 1993-08-15
PT92418B (pt) 1995-08-09
CH676478A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1991-01-31

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