EP0371922A1 - Nähmaschine - Google Patents

Nähmaschine Download PDF

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Publication number
EP0371922A1
EP0371922A1 EP89810885A EP89810885A EP0371922A1 EP 0371922 A1 EP0371922 A1 EP 0371922A1 EP 89810885 A EP89810885 A EP 89810885A EP 89810885 A EP89810885 A EP 89810885A EP 0371922 A1 EP0371922 A1 EP 0371922A1
Authority
EP
European Patent Office
Prior art keywords
thread
machine according
needle
stop
claw
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
EP89810885A
Other languages
English (en)
French (fr)
Other versions
EP0371922B1 (de
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/de
Application granted granted Critical
Publication of EP0371922B1 publication Critical patent/EP0371922B1/de
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 thread brought by the needle and passing it around a bobbin, the thread of which then passes through this loop to form a stitch, a conveyor mechanism for moving the fabric to be sewn from sewing stitch made at the next stitch to be made, means being provided for slackening the thread coming from the bobbin, during each sewing stitch formation.
  • 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 means.
  • the machine comprises a member actuated by the conveyor mechanism to relax the bobbin thread during each cycle of the conveyor mechanism.
  • the lower arm 1 of a sewing machine is hollowed out and contains a loop sensor forming part of a bowl 3 driven in rotation by a motor shaft 4 carrying a tangent screw 5 meshing with a toothed wheel 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 claw 17.
  • each shoe 23 abuts 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 extent of the slack depending on the lateral position of the wire 8 in the case where the machine is scheduled to perform zig-zag stitches.
  • bent shape of the steel wire must be adapted as a function of the general geometry of the machine, in particular the starting position of the lower wire 8 when it leaves the shoe 9 relative to the position of this wire in the seam 10.
  • 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 Nähmaschine Expired - Lifetime EP0371922B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4431/88A CH676478A5 (de) 1988-11-29 1988-11-29
CH4431/88 1988-11-29

Publications (2)

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

Family

ID=4275999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89810885A Expired - Lifetime EP0371922B1 (de) 1988-11-29 1989-11-20 Nähmaschine

Country Status (15)

Country Link
US (1) US5048438A (de)
EP (1) EP0371922B1 (de)
JP (1) JPH02182289A (de)
KR (1) KR900008095A (de)
CN (1) CN1024207C (de)
AU (1) AU621420B2 (de)
BR (1) BR8906016A (de)
CA (1) CA2004054A1 (de)
CH (1) CH676478A5 (de)
DD (1) DD289783A5 (de)
DE (1) DE68907867T2 (de)
ES (1) ES2042064T3 (de)
PT (1) PT92418B (de)
RU (1) RU1834935C (de)
ZA (1) ZA898422B (de)

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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006150A (en) * 1963-05-14 1965-09-29 Singer Co Bobbin thread pull-off for sewing machines
US4182250A (en) * 1979-02-02 1980-01-08 The Singer Company Bobbin thread control means for a lock stitch sewing machine
DE3023145A1 (de) * 1979-06-20 1981-01-22 Janome Sewing Machine Co Ltd Steppstich-naehmaschine mit fadenspannvorrichtung
US4437421A (en) * 1980-11-06 1984-03-20 The Singer Company Variable pull off for bobbin thread
DE3346887A1 (de) * 1982-12-27 1984-06-28 Janome Sewing Machine Co., Ltd., Tokyo Vorrichtung zum einstellen des masses an spannungslosigkeit des unterfadens fuer eine zickzack-naehmaschine
US4638751A (en) * 1984-08-31 1987-01-27 Janome Sewing Machine Co., Ltd. Sewing machine with a device for setting thread tension
US4704975A (en) * 1985-05-23 1987-11-10 Janome Sewing Machine Co. Ltd. Upper and lower thread tension devices for sewing machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467039A (en) * 1967-11-20 1969-09-16 Singer Co Work feeding mechanisms for sewing machines
US4215639A (en) * 1979-02-02 1980-08-05 The Singer Company Selectively controllable bobbin thread pull-off mechanism
US4399761A (en) * 1981-07-13 1983-08-23 The Singer Company Resilient bobbin thread pull-off member for lockstitch sewing machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1006150A (en) * 1963-05-14 1965-09-29 Singer Co Bobbin thread pull-off for sewing machines
US4182250A (en) * 1979-02-02 1980-01-08 The Singer Company Bobbin thread control means for a lock stitch sewing machine
DE3023145A1 (de) * 1979-06-20 1981-01-22 Janome Sewing Machine Co Ltd Steppstich-naehmaschine mit fadenspannvorrichtung
US4437421A (en) * 1980-11-06 1984-03-20 The Singer Company Variable pull off for bobbin thread
DE3346887A1 (de) * 1982-12-27 1984-06-28 Janome Sewing Machine Co., Ltd., Tokyo Vorrichtung zum einstellen des masses an spannungslosigkeit des unterfadens fuer eine zickzack-naehmaschine
US4638751A (en) * 1984-08-31 1987-01-27 Janome Sewing Machine Co., Ltd. Sewing machine with a device for setting thread tension
US4704975A (en) * 1985-05-23 1987-11-10 Janome Sewing Machine Co. Ltd. Upper and lower thread tension devices for sewing machine

Also Published As

Publication number Publication date
US5048438A (en) 1991-09-17
KR900008095A (ko) 1990-06-02
DE68907867T2 (de) 1994-01-27
DD289783A5 (de) 1991-05-08
CA2004054A1 (fr) 1990-05-29
CH676478A5 (de) 1991-01-31
RU1834935C (ru) 1993-08-15
CN1043168A (zh) 1990-06-20
ES2042064T3 (es) 1993-12-01
ZA898422B (en) 1990-06-27
DE68907867D1 (de) 1993-09-02
BR8906016A (pt) 1990-06-19
JPH02182289A (ja) 1990-07-16
AU4559789A (en) 1990-06-07
PT92418A (pt) 1990-05-31
EP0371922B1 (de) 1993-07-28
PT92418B (pt) 1995-08-09
CN1024207C (zh) 1994-04-13
AU621420B2 (en) 1992-03-12

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