EP0031323B1 - Rotary hook for sewing machine - Google Patents

Rotary hook for sewing machine Download PDF

Info

Publication number
EP0031323B1
EP0031323B1 EP79900750A EP79900750A EP0031323B1 EP 0031323 B1 EP0031323 B1 EP 0031323B1 EP 79900750 A EP79900750 A EP 79900750A EP 79900750 A EP79900750 A EP 79900750A EP 0031323 B1 EP0031323 B1 EP 0031323B1
Authority
EP
European Patent Office
Prior art keywords
bobbin
holder
assembly
sewing machine
bobbin holder
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
EP79900750A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0031323A4 (en
EP0031323A1 (en
Inventor
Wayne E. Starr
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.)
Individual
Original Assignee
Individual
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
Priority claimed from US06/052,793 external-priority patent/US4284017A/en
Application filed by Individual filed Critical Individual
Publication of EP0031323A1 publication Critical patent/EP0031323A1/en
Publication of EP0031323A4 publication Critical patent/EP0031323A4/en
Application granted granted Critical
Publication of EP0031323B1 publication Critical patent/EP0031323B1/en
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
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/28—Applications of bobbins for storing the lower 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
    • D05D2207/05—Magnetic devices
    • D05D2207/06—Permanent magnets

Definitions

  • the invention relates to lock-stitch sewing machines.
  • it relates to a rotary hook and bobbin assembly for a single-needle lock-stitch sewing machine.
  • Such prior art assembly comprises a rotary driving shaft, a bobbin holder engageable with said shaft and with the sewing machine, a bobbin engageable with the bobbin holder, and a rotary hook mounted on said shaft for rotational movement relative to the bobbin holder, said bobbin holder having a needle opening, an opening for positioning the bobbin holder on the sewing machine positioner, a bevelled guide surface for the needle thread, a bobbin post on which the bobbin is freely rotatably mounted, and means for applying force axially on the bobbin so as to drive and maintain the flat bobbin end plate in frictional contact with the bottom wall of the bobbin holder.
  • the object of the present invention is to provide a hook and bobbin assembly having higher thread capacity, ease of threading, self-adjusting tension, less stalling, and higher speed than the prior art.
  • a rotary hook and bobbin assembly of the basic type first referred to is characterised in that the bobbin has a convexly curved outer end plate, that the bobbin holder has an undergroove adjacent the opening for engaging the bobbin thread passing from the bobbin outwardly of the bobbin holder, and that the convexly curved outer end plate of the bobbin and the bevelled surface of the bobbin holder are so disposed as to contact and support the needle thread looped around the bobbin holder.
  • automatic tension control for the bobbin thread is provided by the combination of the continuous curved outer surface, the undergroove and the flat surface of the bobbin.
  • the flat side of the bobbin makes total contact with the back wall of the holder, with the curved end out.
  • the bobbin thread is drawn off the bobbin the bobbin spins in a clockwise direction which is opposite to the counterclockwise rotation of the assembly. This permits the bobbin to thread itself in the holder.
  • the operator simply puts in a bobbin and starts to sew with no need to pick up the bobbin thread manually as in previous hook assemblies.
  • the opposite directions of rotation provide inertial balance and smooth, quiet operation.
  • Said means for applying force axially on the bobbin may comprise a curved spring-loaded arm means which confirms to the curvature of the bobbin end plate.
  • said means may comprise magnetic means, such as magnetic discs on the floor of the bobbin holder.
  • the sewing machine 9 has a conventional reciprocating needle 31 which extends through the pressure foot 32 and bottom plate 33 into the assembly 10 through needle opening 19.
  • the assembly 10 of the bobbin holder 11 and bobbin 12 are attached to the machine by a holding means 23 which consists of a removable plate 25 and a cup portion 24.
  • the cup portion 24 has a back opening 24b to receive the rotary driving shaft (not illustrated) and hold it by means of bolt 24a.
  • Cup portion 24 also has a raceway 24c which cooperates with the ridge 22 of the holder 11 to hold it in position.
  • the removable portion 25 permits the insertion and locking of the holder 11 with its ridge into the groove.
  • the holder 11 has a center hollow post 14 on which the bobbin 12 is mounted.
  • the holder 11 has a ridge 22 for mounting the holding means 23, an upper, rear bevelled surface 20, a needle opening 19, a finger 17, a relatively wide undergroove 16 in which the bobbin thread moves, an opening 18 which is engageable with the positioner 41 which is normally attached to the sewing machine, and a floor 11 a in which there is an opening 15.
  • the center post 14 of the holder has a spring 27 held with locking rod 27a against arm 13 which pivots on rod 28.
  • Arm 13 is curved so as to register with the curvature of end wall 12a of bobbin 12 and it extends over the bobbin so as to lock into groove 21 in the holder.
  • the other end wall 12b of the bobbin 12 is flat and seats against the bottom wall 11 a of the holder 11.
  • the needle 31 goes down and after reaching its lowest point on the downward stroke forms a little loop as it rises.
  • This loop of needle thread 40 is picked up by the point of the hook 23a (Fig. 2) and carried around the holder 11 (Fig. 5) and then draws the bobbin thread up to form the proper stitch.
  • the ridge 22 has an interruption 22a to permit the smooth flow of the needle thread around the holder.
  • the bobbin has no case and that the spring-held, curved arm cooperates in forming the non-snagging surface for the needle thread. No adjustments are needed in changing from one thickness of thread to another.
  • the tension is directly on the bobbin and regardless of any bumps or the like that might be in the thread, the tension is automatically adjusted by the drag caused by the arm and the frictional engagement of the thread on the undergroove 16.
  • the bobbin 112 is of the same configuration having a curved outer wall 112a and a flat inner wall 112b.
  • the bobbin must be made of ferro-magnetic material at least with respect to wall 112b.
  • the assembly 110 of the bobbin holder 111 and bobbin 112 are attached to the machine by a similar holding means 123 which consists of a removable plate 125 and a cup portion 124.
  • the cup portion 124 has a back opening 124b to receive the rotary driving shaft (not illustrated) and hold it by means of a bolt 124a.
  • Cup portion 124 also has a raceway 124c to latch 122 of the holder 111 to hold it in position.
  • the removable portion 125 permits the insertion and locking of the holder 111 when it is latched into the groove.
  • the holder 111 has a ridge 122 for mounting the holding means 124, an upper rear bevelled surface 120, a needle opening 119, a finger 117, a relatively wide undergroove 116 in which the bobbin thread moves, an opening 118 which is engageable with the finger position 141 which is normally attached to the sewing machine and floor 111 a in which there is an opening 115.
  • the floor 111a of the holder 111 has two magnetic discs 141.
  • a suitable magnetic disc would be a rare earth cobalt magnet of the order of 3/16 inches (4.8 mm) in diameter with an energy product of fifteen million gauss-oersteds and having a composition of approximately 65% cobalt and 35% samarium. Sources of such rare earth magnets include Emm Indiana General, a division of Electronic Memories and Magnetics Corp. of Valpariso, Indiana, Crucible Magnetics Division of Colt Industries, Elizabethtown, Kentucky and Hitachi Magnetics Corp. of Edmore, Michigan.
  • the bobbin 112 is held on the holder 111 by the magnetic forces of the discs 141 and thus provides the tension for the bobbin thread.
  • the bobbin 112 is removed from the holder 111 by inserting a finger into the slot 121 and pulling forward.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP79900750A 1979-07-02 1979-07-10 Rotary hook for sewing machine Expired EP0031323B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52793 1979-07-02
US06/052,793 US4284017A (en) 1978-07-13 1979-07-02 Rotary hook for sewing machine

Publications (3)

Publication Number Publication Date
EP0031323A1 EP0031323A1 (en) 1981-07-08
EP0031323A4 EP0031323A4 (en) 1981-10-27
EP0031323B1 true EP0031323B1 (en) 1986-04-02

Family

ID=21979927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79900750A Expired EP0031323B1 (en) 1979-07-02 1979-07-10 Rotary hook for sewing machine

Country Status (6)

Country Link
EP (1) EP0031323B1 (sv)
JP (1) JPS6147114B2 (sv)
GB (1) GB2063939B (sv)
NL (1) NL7920001A (sv)
SE (1) SE440671B (sv)
WO (1) WO1981000120A1 (sv)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9404510D0 (en) * 1994-03-09 1994-04-20 Courtaulds Fibres Holdings Ltd Fibre treatment
JPH08135643A (ja) * 1994-11-07 1996-05-31 Iwata Bolt Kk ね じ
DE19840956C1 (de) * 1998-09-08 2000-02-24 Gerd Papajewski Umlaufender Greifer für Doppelsteppstich-Nähmaschinen
KR100515898B1 (ko) * 2004-01-15 2005-09-21 코베스트 주식회사 재봉틀의 회전북장치
CN107075766B (zh) * 2015-01-13 2019-08-06 株式会社广濑制作所 立式全旋梭

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50727C (de) * W. v. PITTLER in Gohlis bei Leipzig Hakengreifer und Doppelschleifenbildung an der unter Nr. 44948 patentirten Doppelsteppstich-Nähmaschine
US1966432A (en) * 1932-05-04 1934-07-17 Singer Mfg Co Stitch forming mechanism for buttonhole sewing machines
GB700306A (en) * 1951-11-02 1953-11-25 Harold Newby Improvements in and relating to lock-stitch sewing machines
US2690726A (en) * 1953-02-09 1954-10-05 David L Wener Bobbin brake
US2784690A (en) * 1953-04-09 1957-03-12 Brandt Kurt Bobbin-canister gripper arrangements for sewing machines
US2830550A (en) * 1953-06-15 1958-04-15 Union Special Machine Co Lockstitch sewing machines
US3476068A (en) * 1967-08-15 1969-11-04 Miracle Hook Corp Sewing hook and bobbin
US4009670A (en) * 1975-11-24 1977-03-01 Beatty Thomas Mitchell Rotary hook sewing machine

Also Published As

Publication number Publication date
SE440671B (sv) 1985-08-12
EP0031323A4 (en) 1981-10-27
JPS6147114B2 (sv) 1986-10-17
GB2063939A (en) 1981-06-10
JPS56500757A (sv) 1981-06-11
GB2063939B (en) 1983-07-27
NL7920001A (nl) 1981-06-01
EP0031323A1 (en) 1981-07-08
WO1981000120A1 (en) 1981-01-22
SE8101313L (sv) 1981-02-27

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