EP0008615B1 - Unter der Stichplatte einer Doppelsteppstichnähmaschine angeordnete Nadelfadenkontrolleinrichtung - Google Patents

Unter der Stichplatte einer Doppelsteppstichnähmaschine angeordnete Nadelfadenkontrolleinrichtung Download PDF

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Publication number
EP0008615B1
EP0008615B1 EP79101922A EP79101922A EP0008615B1 EP 0008615 B1 EP0008615 B1 EP 0008615B1 EP 79101922 A EP79101922 A EP 79101922A EP 79101922 A EP79101922 A EP 79101922A EP 0008615 B1 EP0008615 B1 EP 0008615B1
Authority
EP
European Patent Office
Prior art keywords
needle thread
sewing machine
looper
thread loop
spring rod
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
Application number
EP79101922A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0008615A1 (de
Inventor
Erich Druffel
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Duerkoppwerke GmbH
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 Duerkoppwerke GmbH filed Critical Duerkoppwerke GmbH
Publication of EP0008615A1 publication Critical patent/EP0008615A1/de
Application granted granted Critical
Publication of EP0008615B1 publication Critical patent/EP0008615B1/de
Expired legal-status Critical Current

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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
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • the invention relates to a lockstitch sewing machine with a rotating hook and a bobbin case with an embedded hook thread bobbin, as well as a device for influencing the movement of the needle thread loop during the stitch tightening.
  • a sewing machine of the type mentioned is known from German patent 422546.
  • a leaf spring is provided on the bobbin case fastening, which interacts with a nose of the bobbin case.
  • the needle thread loop is held in place and clamped briefly, the spring tensioning.
  • the spring snaps the loop, which has been contracted to a small diameter, against the underside of the material. This largely prevents the formation of the known unsightly nodules, the so-called dolls, which are particularly evident on the underside of the fabric in the case of heavily twisted yarns.
  • a spring with a similar effect has become known from DE-PS 2741830. Thereafter, a spring rod clamped at one end, as the gripper counter tip, picks up the needle thread loop thrown off the actual gripper tip, holds it back briefly and then also lets it snap off as a result of the further movement of the gripper.
  • the known devices for influencing the needle thread loop mentioned allow it to contract to a relatively small diameter, so that there is only little space left for the formation of the undesirable "dolls".
  • these devices for influencing the needle thread loop require for their proper function that the tensions acting on the needle thread loop and on the looper thread wrapped around it have a balanced ratio, as is the case in conventional sewing applications with a normal lockstitch entwined in the middle of the fabric.
  • the needle thread tension adjusted relative to the bobbin thread tension weaker so impede the highly strained looper thread which is embraced by the under low voltage needle thread loop, the desired J jump effects with which the loop is bounced against the fabric base.
  • the invention has for its object to provide a device for influencing the movement of the needle thread loop, which works equally safely even with abnormal thread tension conditions.
  • Gripper 2 in Fig. 1 is a rotating gripper of conventional design in the horizontal shaft design, which belongs to a lockstitch sewing machine, not shown, also of known construction.
  • the needle thread loop 3 after it has been guided around the hook 2 in the usual manner with the hook thread 4 emerging from the housing of the hook 2 - being thrown off the invisible tip thereof.
  • the needle thread loop 3 is - as is known - under the influence of a conventional thread lever, not shown, during the stitch tightening phase and moves upwards with the looped looper thread 4 until its movement is stopped by a spring bar 1.
  • the spring bar 1 bent at its ends in a U-shape is fastened to the clamping blocks 5 and 5 'located on the underside of the needle plate 7 (FIG. 2) shown in detail with the clamping screws 6 and 6'.
  • the clamping blocks 5 and 5 ' are arranged in such a way that the spring bar 1 is directed transversely to the material feed direction NV - preferably at right angles to the axis of rotation of the hook - and can also be displaced slightly in the material feed direction NV. This is done from the extended position shown in the drawings with solid lines (unloaded spring rod 1) in the bent position shown further to the right, dash-dotted lines.
  • the needle thread loop 3 now only covers the short distance to the fabric, where - as mentioned - the needle and looper thread are then entwined on the underside of the fabric.
  • the result is a clean and flawless seam pattern that was previously unknown in sewing applications with a “raised seam”, as nodules tend to appear here due to the uneven tension ratio.
  • the extremely short path between the spring bar attached under the needle plate to the fabric also has a positive effect, since the uncontrolled movement of the needle thread loop between spring bar 1 and fabric has been reduced to a minimum.
  • the invention is not limited to the exemplary embodiment described; there are numerous other designs and attachments of the spring rod, for. B. as a one-sided clamp, possible.
  • the application of the invention will mainly extend to sewing applications with different thread tension ratios; however, the improvement of the seam appearance of a conventional lockstitch seam by means of the invention is also conceivable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP79101922A 1978-06-24 1979-06-13 Unter der Stichplatte einer Doppelsteppstichnähmaschine angeordnete Nadelfadenkontrolleinrichtung Expired EP0008615B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2827832 1978-06-24
DE2827832A DE2827832C2 (de) 1978-06-24 1978-06-24 Doppelsteppstichnähmaschine

Publications (2)

Publication Number Publication Date
EP0008615A1 EP0008615A1 (de) 1980-03-19
EP0008615B1 true EP0008615B1 (de) 1982-11-17

Family

ID=6042685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79101922A Expired EP0008615B1 (de) 1978-06-24 1979-06-13 Unter der Stichplatte einer Doppelsteppstichnähmaschine angeordnete Nadelfadenkontrolleinrichtung

Country Status (4)

Country Link
US (1) US4279210A (enrdf_load_stackoverflow)
EP (1) EP0008615B1 (enrdf_load_stackoverflow)
JP (1) JPS5538187A (enrdf_load_stackoverflow)
DE (1) DE2827832C2 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6317425Y2 (enrdf_load_stackoverflow) * 1979-03-26 1988-05-17
JPS60110265A (ja) * 1983-07-26 1985-06-15 Kibun Kk 練製品の成形法および装置
DE4004684C1 (en) * 1990-02-15 1991-04-18 G.M. Pfaff Ag, 6750 Kaiserslautern, De Sewing machine - has guide for needle thread loop formed out of U=shaped cam, whose sides run parallel to circulation plane of feed dog

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR336504A (fr) 1903-11-09 1904-03-11 Otto Kammerer Perfectionnements apportés aux chariots roulant sur une voie inclinée
US1461428A (en) * 1919-09-23 1923-07-10 Frederick Osann Co Sewing machine
DE442546C (de) * 1924-03-28 1927-04-04 I G Farbenindustrie Akt Ges Zubringevorrichtung mit exzentrisch zum Gehaeuse gelagerter Walze
US2178543A (en) * 1936-07-25 1939-11-07 Union Special Machine Co Lock stitch sewing machine
DE739559C (de) * 1940-05-30 1943-09-29 Duerkoppwerke Ag Verfahren und Vorrichtung zur Herstellung von Knopfloechern auf Doppelsteppstich-Knopflochnaehmaschinen
JPS5519635B2 (enrdf_load_stackoverflow) * 1974-04-27 1980-05-27
DE2741830B1 (de) * 1977-09-16 1979-03-01 Duerkoppwerke Umlaufender Doppelsteppstichgreifer

Also Published As

Publication number Publication date
EP0008615A1 (de) 1980-03-19
DE2827832A1 (de) 1980-01-17
JPS5538187A (en) 1980-03-17
DE2827832C2 (de) 1982-07-22
JPS636236B2 (enrdf_load_stackoverflow) 1988-02-08
US4279210A (en) 1981-07-21

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