US3817197A - Needle threading device assembled on sewing machines - Google Patents

Needle threading device assembled on sewing machines Download PDF

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Publication number
US3817197A
US3817197A US00370147A US37014773A US3817197A US 3817197 A US3817197 A US 3817197A US 00370147 A US00370147 A US 00370147A US 37014773 A US37014773 A US 37014773A US 3817197 A US3817197 A US 3817197A
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US
United States
Prior art keywords
needle
cover
hook
small plate
sewing machine
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Expired - Lifetime
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US00370147A
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English (en)
Inventor
N Bianchi
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Necchi SpA
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Necchi SpA
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Publication date
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B87/00—Needle- or looper- threading devices
    • D05B87/02—Needle- or looper- threading devices with mechanical means for moving thread through needle or looper eye

Definitions

  • ABSTRACT A needle threading device for a sewing machine having its head closed laterally by a cover which includes a small plate supporting a needle threading hook having a longitudinal groove in its upper end, on its lower end a vertical wall insertable in a groove in the cover, a horizontal section adjoining the vertical wall which enables the operator to move the plate, two sections at right angles to each other on the lower end thereof.
  • the first of which is horizontal and provides an edge to line up the threading hook with the needle eye of the machine and the second of which is vertical and provides support for the hook and a centering spring element, a reference element having a plane surface slanting with respect to the horizontal which may rest on the top of the needle bar of the machine and an oblique portion at its upper end to permit transversal oscillation of the hook lining up with the needle eye; a pin provided on the internal wall of the cover and engageable with the groove of the plate and a spring on the pin to constrain the plate against the internal wall of the cover.
  • the present invention relates to a needle threading device assembled on sewing machines the head of which is closed laterally by a cover.
  • Some needle threading devices already known in the art have a complex and bulky structure, devised to secure the correct positioning of the thread catching hook with respect to the needle eye on passing from the idle position of the device to the working position.
  • the purpose of the present invention is to create a simple needle threading device both as regards construction and working which eliminates the inconveniences mentioned above.
  • the technical problem to be solved in order to obtain the expressed purpose was to reduce to a minimum the elements making up said device and to equip the device with suitable means for its working so that it may be transferred from a rest position, in which it is hidden into the sewing machine head, to a working position in which its threading hook is set automatically in line with the needle eye.
  • the device consists of a small plate bearing the needle threading hook constrained to the lateral cover of the sewing machine head in such a way as to make some linear displacements in contact with the internal surface of the cover and pendular oscillations within two vertical orthogonal planes.
  • the displacements and oscillations are apt to transfer the threading hook from a rest position to a position in which it is in line with the needle eye and, subsequently, it is apt to make the movement for threading the thread through said needle eye.
  • FIG. I. is a partial front view, cross-section, of a sewing machine head containing the device of the invention.
  • FIG. 2 is a lateral view of the head and the device of FIG. l;
  • FIG. 3 shows a detailed perspective view of the device of FIG. ll;
  • FIGS. 4 and 5 show, schematically, two working conditions of the device of FIG. 1, and finally FIG. 6 shows a detailed perspective view of the de vice of FIG. l in a rest position.
  • sewing machine head 10 with the end of the horizontal arm 11 within which the main shaft 12 is located, which arm is supported by bushing 13.
  • connection between connecting rod 15 and needle bar i6 is made by means of an articulation l7 allowing the needle bar in to incline with respect to the vertical line when the machine is making zigzag stitches.
  • the needle bar support 18 receives in a usual way the unidimensional impulses for the zigzag sewing from a control rod not shown in the drawings and oscillates by means of a carriage spring 19 connecting said support 18, at its oscillation center consisting of the point of attachrnent of said spring, to boss 20 provided on the sewing machine frame.
  • Screw 21 is the fastening means for spring 19 to boss 20.
  • thread take-up device 22 actuated in a known way by the rotation of the main shaft 12 through handcrank 14, connecting rod 15, presser bar 23 and presser foot 24.
  • the sewing machine head 10 is closed laterally by a cover 25 having the shape of a plate on the exterior of which are fixed the knob 26 for regulating the upper thread tension and the knob 27 for regulating the presser bar.
  • a pin 28 is fixed, which is provided with a head 29.
  • the needle threading device consists of a small plate 30 having a lengthened shape with a lengthwise groove 31 at its top (FIG. 2). This groove is engaged by pin 28 about which plate 30 can pivot and is pushed against the internal wall of cover 25 by one end of a spiral spring 32 having a conical shape. The other end of the spring 32 rests against the head 29 of pin 28.
  • Small plate 30 (FIG. 3) has, in its lower section, a vertical wall 33 having connected thereto a rectangularly shaped horizontal plate 34 whose task will be illustrated hereinafter.
  • a further extension of small plate 30 consists of the two sections 35 and 36 forming a right angle between them.
  • the first section 35 has an edge 37 whose task will be explained hereinafter.
  • the second vertical section 36 are fixed in a known way hook 38 for the thread and two elastic springs 39 and 40 apt to engage the ending wall of needle 4-1 and secure the exact positioning of hook 38 to the needle eye 42.
  • Small plate 30 is provided, on its top, by a section 43 slanting with respect to the remaining section and a reference element 44 ending in a little plane 45, slanting from the horizontal. The reason for these arrangements will be made clear by the following description of the working of the device of the present invention.
  • FIGS. 1 and 2 the needle threading device is shown in its rest position.
  • Spring 32 forces small plate 30 of the device against the internal wall of cover 25.
  • Small plate 30 is prevented from rotating about pin 28 owing to the fact that its vertical wall 33 is inserted in a slot provided on the lower end of the cover itself.
  • needle bar 16 positioned vertically in its central point with respect to zigzag sewing.
  • section 43 The slanting of section 43 with respect to the residual section of small plate 30 is such as to bring hook 38 in line with the needle eye 42, so that the threading of the hook may take place through a simple oscillation of small plate 30 about pin 28.
  • the downward displacement of small plate 30 stops when section 45 of reference element 44 rests on the upper part of needle bar 16, which the operator already has brought to nearly its top dead center position.
  • One advantage of the device of the present invention with respect to some types known in the art consists of the fact that no special care is required for positioning the needle bar 16 in its highest position.
  • the needle eye can be threaded by hook 38 in a rather wide range of positions near the top dead center position of the needle bar.
  • a further advantage of the present invention is that by a simple contrivance the needle threading device is adapted to operate in any position of the needle in a transversal direction to the stitching line, i.e., in any position possibly taken by the needle bar when performing zigzag sewing.
  • section 45 of reference element 44 fixed to the upper part of small plate 30 is somewhat slanted with respect to the horizontal.
  • Small plate 30 has, besides the possibility of making oscillations about pin 28 relative to the actual threading operation, also the possibility of making, contrary to the action of spring 32, oscillations in parallel to the transversal displacements of the needle when making zigzag stitches. As is shown in FIGS. 4 and 5, this further capability allows hook 38 of the threading device to follow the needle eye, which may be displaced with respect to its central position indicated in FIGS. 4 and by the A-A dash and point line. The hook, however, transversally oscillating with small plate 30 (FIG.
  • Threading is thus accomplished in any sewing condition.
  • a needle threading device comprising a small plate supporting the needle threading hook and means to constrain said plate to said cover so as to make linear displacements in contact with the internal surface of said cover and pendular oscillations within two vertical orthogonal planes, said displacements and oscillations being apt to transfer the threading hook from a rest position to a position in which it is lined up with the needle eye and performs the threading movement through said needle eye.
  • said means include a pin provided on the internal wall of said cover and a spiral spring having a conical shape provided on said pin, said small plate having on its top a longitudinal groove engageable with said pin and being constrained against the internal wall of the cover by said spring.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00370147A 1972-06-27 1973-06-14 Needle threading device assembled on sewing machines Expired - Lifetime US3817197A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT42914/72A IT961268B (it) 1972-06-27 1972-06-27 Dispositivo infila ago applicato a macchine per cucire

Publications (1)

Publication Number Publication Date
US3817197A true US3817197A (en) 1974-06-18

Family

ID=11254683

Family Applications (1)

Application Number Title Priority Date Filing Date
US00370147A Expired - Lifetime US3817197A (en) 1972-06-27 1973-06-14 Needle threading device assembled on sewing machines

Country Status (7)

Country Link
US (1) US3817197A (de)
CH (1) CH558440A (de)
DE (1) DE2332148C3 (de)
ES (1) ES415864A1 (de)
FR (1) FR2191567A5 (de)
GB (1) GB1405808A (de)
IT (1) IT961268B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300463A (en) * 1979-07-27 1981-11-17 Janome Sewing Machine Co., Ltd. Needle threading device for sewing machines
WO1998035606A2 (en) 1997-02-13 1998-08-20 Boston Scientific Ireland Limited, Barbados Head Office Method and apparatus for minimally invasive pelvic surgery

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2906748B2 (ja) * 1991-07-02 1999-06-21 ブラザー工業株式会社 ミシンの糸通し装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739553A (en) * 1953-04-09 1956-03-27 Pfaff Ag G M Operating mechanism for needle threading devices
US3002476A (en) * 1958-09-05 1961-10-03 Capelli Giuseppe Sewing machines' needle eyes threader
US3485194A (en) * 1967-03-27 1969-12-23 Janome Sewing Machine Co Ltd Threading device for sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2739553A (en) * 1953-04-09 1956-03-27 Pfaff Ag G M Operating mechanism for needle threading devices
US3002476A (en) * 1958-09-05 1961-10-03 Capelli Giuseppe Sewing machines' needle eyes threader
US3485194A (en) * 1967-03-27 1969-12-23 Janome Sewing Machine Co Ltd Threading device for sewing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300463A (en) * 1979-07-27 1981-11-17 Janome Sewing Machine Co., Ltd. Needle threading device for sewing machines
WO1998035606A2 (en) 1997-02-13 1998-08-20 Boston Scientific Ireland Limited, Barbados Head Office Method and apparatus for minimally invasive pelvic surgery
EP1344495A2 (de) 1997-02-13 2003-09-17 Boston Scientific Limited Dilatator für minimal invasive Beckenchirurgie

Also Published As

Publication number Publication date
ES415864A1 (es) 1976-02-01
FR2191567A5 (de) 1974-02-01
DE2332148C3 (de) 1980-11-13
CH558440A (it) 1975-01-31
DE2332148B2 (de) 1980-03-20
DE2332148A1 (de) 1974-01-10
GB1405808A (en) 1975-09-10
IT961268B (it) 1973-12-10

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