US3645222A - Self-threading sewing machine needle - Google Patents

Self-threading sewing machine needle Download PDF

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Publication number
US3645222A
US3645222A US75055A US3645222DA US3645222A US 3645222 A US3645222 A US 3645222A US 75055 A US75055 A US 75055A US 3645222D A US3645222D A US 3645222DA US 3645222 A US3645222 A US 3645222A
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US
United States
Prior art keywords
needle
thread
threading
blade
sewing machine
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
US75055A
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English (en)
Inventor
Josef Zocher
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.)
SINGER SPEZIALNADELFABRIK A CORP OF WEST GERMANY GmbH
Original Assignee
Singer Co
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Publication date
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Publication of US3645222A publication Critical patent/US3645222A/en
Assigned to SINGER SPEZIALNADELFABRIK GMBH, A CORP OF WEST GERMANY reassignment SINGER SPEZIALNADELFABRIK GMBH, A CORP OF WEST GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE, A CORP OF NJ
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
    • D05B85/00—Needles
    • D05B85/02—Needles with slotted eyes, i.e. with a slit leading to the eye for thread insertion

Definitions

  • ATTORNEY WITNESS SELF-THREADING SEWING MACHINE NEEDLE BACKGROUND OF THE INVENTION
  • Previously known self-threading needles which include a threading slot extending upwardly from the needle eye to a level above that which the needle penetrates the work, have not proven satisfactory in use for a variety of reasons. Most are unsatisfactory because the needle blade is seriously weakened. As exemplified in the disclosure of the US. Pat. of .l. W. Alexander, No. 2,295,193, issued Sept. 8, 1942, the thread directing fin, similar to that used with most known selfthreading needles of this type, extends alongside the needle blade and is unstabilized and free to vibrate objectionally relatively to the blade.
  • the object of this invention is attained by providing a twist in the blade of a self-threading sewing machine needle having a lengthwise threading slot.
  • the spirally entwined portions of the needle blade are mutually strengthened by the twist and the fin or needle blade portion, which yields to pass a sewing thread into the needle eye, is stabilized thereby so that lateral vibration is prevented by the interlocking action provided by the twist.
  • the interlocking action provided by the twist formed in the divided needle blade is enhanced when the threading slot is formed exceedingly narrow and preferably is substantially closed as by a pressing operation on the needle blade after the cutting of the threading slot.
  • a tapered configuration of the thread-carrying needle eye is desirable. It has been found that a tapered needle eye can be made longer commensurate with adequate control of the thread during sewing and the longer eye enhances the flexibility of the portions of the needle blade which are divided by the threading slot.
  • FIG. 1 represents an elevational view of a sewing machine needle embodying this invention as viewed from a position looking through the needle eye and with the width of the threading slot exaggerated for clarity;
  • FIG. 2 represents an elevational view taken from the lefthand side of the sewing machine needle of FIG. 1 with portions illustrated in cross section and with the width of the threading slot exaggerated;
  • FIG. 3 is an enlarged cross sectional view of the needle taken substantially along line 33 of FIG. 2 without exaggeration of the width of the threading slot and including a representation of a thread being directed into the thread inlet slot;
  • FIG. 4 is an enlarged cross sectional view of the needle taken substantially along line 44 of FIG. 2 and including a representation of a thread being directed along the threading slot;
  • FIG. 5 is an enlarged cross-sectional view of the needle taken substantially along line 5-5 of FIG. 2 without exaggeration of the width of the threading slot;
  • FIG. 6 is an enlarged elevational view of a fragment of a semifinished needle in accordance with this invention viewed in a direction looking through the needle eye;
  • FIG. 7 is an enlarged elevational view of the same fragment of the needle as shown in FIG. 6 but showing the needle in finished form.
  • the needle of this invention is formed with a shank 11 which may be slabbed as at 12 for orientation in a sewing machine needle clamp. From the shank, the needle tapers to a blade portion 13 which, at the opposite end from the shank, is formed with a pointed extremity l4. Adjacent to the pointed extremity the needle blade is formed with a transverse thread-carrying eye 15 through which a sewing thread must extend during sewing operation.
  • the needle as thus far described, has a conformation and general relationship of parts which is well known in conventional sewing machine needles so that the needle of this inven tion is exchangeable with ordinary needles in a sewing machine.
  • a long thread accommodat ing groove 20 is formed from the needle eye 15 to the needle shank 11 on that side of the needle from which the thread extends to the supply spool.
  • the long thread-accommodating groove 20 is preferably of a size and width fully comparable to the long groove of a similar size conventional needle.
  • a long groove 25 is formed in the blade from the needle eye to the shank.
  • the long groove 25, however, is preferably made much narrower than the groove 20 and is offset to one side of the center of the needle section as shown in FIGS. 3, 4 and 5. The narrow long groove 25 facilitates the introduction of thread into the eye of the needle in accordance with this invention as will be described hereinbelow.
  • the needle blade 13 is split into two lateral segments 30 and 31 by a threading slot 40 which extends from the juncture of the needle blade 13 with the shank 11 to the needle eye 15.
  • the threading slot 40 is formed along one edge of and opens onto each of the thread accommodating grooves 20 and 25. Since the threading slot 40 is arranged toward one side of the needle blade, the lateral segment 31 defined thereby will be considerably smaller in cross sectional extent than the segment 30.
  • a transverse thread inlet slot 50 is formed across the needle sufiiciently deep as to open onto the threading slot 40 thus providing a path for the thread from exteriorly of the needle through the inlet slot 50 and along the threading slot 40 to the needle eye.
  • FIGS. 1 and 2 illustrate a preferred form of this invention in which a twist of greater than 180 has been imparted to only that portion of the needle blade immediately adjacent to the needle shank 11. As shown, the twist occurs over less than half the distance between the thread inlet slot 50 and the needle eye 15.
  • This form of construction is preferable because the free extremity of the blade segment 31 is interlocked with the segment 30 and stabilized thereby and the lower portion of the thread accommodating groove 20 remains straight and can accept the supply limb of thread to discourage loop formation on that side of the needle.
  • a twist of greater than 180 proves most effective in stabilizing the needle blade segments with a twist of 185 to 200 about the lengthwise axis of the needle being ideal; however, twists of less than 180 provide proportionate advantages and are superior to prior art constructions which have no twist whatever.
  • the threading slot is purposely illustrated wider than the slot preferably is dimensioned in a finished needle; and this exaggeration is purposely done in order to illustrate the construction more clearly.
  • a very narrow threading slot 40 may be provided by first cutting the slot 40 using a cutting wheel or the like, with a considerable width as shown in FIG. 6 and then subsequently pressing the needle blade 13 substantially completely closing the slot 40 as shown in FIG. 7.
  • the needle blade 13 may be formed initially wider or with a larger diameter to compensate for the subsequent reduction in size when the slot 40 is pressed closed.
  • the lateral segments 30 and 31 of the needle blade When the thread is introduced to the threading slot 40, the lateral segments 30 and 31 of the needle blade must flex apart particularly when the threading slot 40 has been pressed closed.
  • the eye of the needle lends flexibility to the lateral segments 30 and 31 and, in particular, an eye of teardrop or tapered shape, which can be made proportionately longer than a round or oval shaped eye, can be used to lend flexibility to the lateral segments 30 and 31 of the needle.
  • FIGS. 3, 4 and 5 The threading sequence when using the needle of this invention is indicated in the cross sectional views of FIGS. 3, 4 and 5.
  • the width of the threading slot 40 is not exaggerated, i.e., it is shown substantially closed in the absence of thread therein as in FIGS. 3 and 5 and is shown forced apart by the thread in FIG. 4.
  • the thread T is first held transversely across the needle blade 13 adjacent to the shank 11 and is directed into the thread inlet slot 50 as shown in FIG. 3.
  • the thread inlet slot 50 By maintaining a slight tension on the thread, it may easily be forced from the thread inlet slot 50 downwardly into the threading slot 40.
  • the lateral segments 30 and 31 of the needle blade will return into substantial engagement as shown in FIG. 5 thus effectively to deter escape of the thread from the eye 15 back into the threading slot 40.
  • the threading slot 40 extends across the needle blade between the grooves and 25. As a thread is drawn along the slot 40, therefore, it will contact only a very narrow section of the needle blade between the grooves 20 and and the frictional resistance to introduction of a thread to the eye will be minimized.
  • the thread since a twist of slightly greater than 180 is imparted to the entire needle blade 13, the thread must be introduced to the thread inlet slot 50 with an orientation opposite that which is desired when the thread is finally positioned in the needle eye.
  • the thread limb which extends to the supply spool must extend from the needle eye, as viewed in FIG. 1, toward the viewer, that limb extending to the supply spool must be directed from behind the needle as viewed in FIG. 1 when being introduced into the inlet slot 50.
  • successive twists in opposite directions may be made along the length of the needle blade so that the blade segments will be interlocked for added stability and yet the thread can be oriented at the start of needle threading precisely as it will be oriented when shifted into the needle eye.
  • the twist which may be of either clockwise or counterclockwise direction, and which may extend over just the uppermost portion of the needle blade or over practically the entire distance between the shank and the needle eye, serves a number of essential purposes influencing the characteristics of the needle during thread insertion and during sewing.
  • the twist locks the free upper extremity of the needle blade segments 30 and 31 together and keeps the smaller segment 31 from vibrating laterally.
  • the twist aids in urging the slot 40 into a closed position.
  • the twist by providing for mutual support of the needle blade segments 30 and 31, strengthens the needle.
  • a self-threading sewing machine needle including a shank adapted to be clamped to the sewing machine, a blade extending from the shank and terminating in a pointed extremity formed with a thread-carrying eye, said blade being formed with a lengthwise thread accommodating groove extending from said thread-carrying eye toward said shank, a threading slot formed through said needle blade and extending lengthwise from adjacent to said shank into said thread-carrying eye, said threading slot opening at one side of said needle blade into said thread-accommodating groove, a thread inlet slot formed transversely across said needle blade adjacent said shank and opening onto said threading slot, and said needle blade along the length of said threading slot being formed with a twist about the longitudinal axis of the needle blade.
  • a self-threading sewing machine needle as set forth in claim 1 in which said twist formed in said needle blade extends continuously and in one direction for an angle of greater than about the longitudinal axis of the needle blade.
  • a self-threading sewing machine needle as set forth in claim 1 in which said twist in the needle blade extends only from said thread inlet slot adjacent the needle shank to a point along said needle blade less than half the distance between said thread inlet slot and the thread-carrying needle eye.
  • a self-threading sewing machine needle as set forth in claim 1 in which said needle blade is formed with a pair of thread-accommodating grooves one at each side of the needle blade and each groove extending from said thread-carrying eye to said shank, and in which said threading slot opens at each side of said needle blade into a respective one of said thread-accommodating grooves.
  • a self-threading sewing machine needle as set forth in claim 4 in which said threading slot opens along one extreme edge of each of said thread-accommodating grooves.
  • a self-threading sewing machine needle as set forth in claim 1 in which said thread-carrying eye is formed with tapered sides which diverge from the pointed extremity of the needle and are widest at the eye extremity into which said threading slot opens.
  • a self-threading sewing machine needle as set forth in claim 1 in which said threading slot is formed with sidewalls which are arranged substantially in touching relationship in the absence of a thread forced therebetween.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US75055A 1970-09-24 1970-09-24 Self-threading sewing machine needle Expired - Lifetime US3645222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7505570A 1970-09-24 1970-09-24

Publications (1)

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US3645222A true US3645222A (en) 1972-02-29

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Family Applications (1)

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US75055A Expired - Lifetime US3645222A (en) 1970-09-24 1970-09-24 Self-threading sewing machine needle

Country Status (7)

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US (1) US3645222A (show.php)
JP (1) JPS5248838Y2 (show.php)
BR (1) BR7106098D0 (show.php)
CS (1) CS154697B2 (show.php)
DE (1) DE2137307A1 (show.php)
FR (1) FR2107527A5 (show.php)
GB (1) GB1365546A (show.php)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233917A (en) * 1977-08-10 1980-11-18 Wool Research Organization Of New Zealand (Inc.) Needle stitching
US20040034370A1 (en) * 2002-08-16 2004-02-19 Rehil Om P. Non-disposable trocar needle and handle
US6723107B1 (en) * 1999-04-19 2004-04-20 Orthopaedic Biosystems Ltd. Method and apparatus for suturing
US20070143975A1 (en) * 2005-12-27 2007-06-28 Groz-Beckert Kg Felting needle
AU2005234698B2 (en) * 2000-04-18 2009-06-18 Orthopaedic Biosystems Ltd., Inc. Method and apparatus for suturing
CN101481858B (zh) * 2008-01-10 2013-08-21 风琴针株式会社 缝纫机针
CN108442053A (zh) * 2018-06-07 2018-08-24 湖州三杰服饰有限公司 一种童装缝纫专用针

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58147504U (ja) * 1982-03-29 1983-10-04 株式会社松谷製作所 縫合針
DE19837144A1 (de) * 1998-08-17 2000-02-24 Juergen Buerger Nähnadel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1073140A (en) * 1912-10-14 1913-09-16 Witmer J Kendig Sewing-needle.
US1441575A (en) * 1920-01-06 1923-01-09 John W Granger Needle
US2295193A (en) * 1940-08-02 1942-09-08 James W Alexander Sewing machine needle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1073140A (en) * 1912-10-14 1913-09-16 Witmer J Kendig Sewing-needle.
US1441575A (en) * 1920-01-06 1923-01-09 John W Granger Needle
US2295193A (en) * 1940-08-02 1942-09-08 James W Alexander Sewing machine needle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233917A (en) * 1977-08-10 1980-11-18 Wool Research Organization Of New Zealand (Inc.) Needle stitching
US6723107B1 (en) * 1999-04-19 2004-04-20 Orthopaedic Biosystems Ltd. Method and apparatus for suturing
US20040176802A1 (en) * 1999-04-19 2004-09-09 Orthopaedic Biosystems Ltd., Inc., A Delaware Corporation Method and apparatus for suturing
AU2005234698B2 (en) * 2000-04-18 2009-06-18 Orthopaedic Biosystems Ltd., Inc. Method and apparatus for suturing
US20040034370A1 (en) * 2002-08-16 2004-02-19 Rehil Om P. Non-disposable trocar needle and handle
US7150753B2 (en) * 2002-08-16 2006-12-19 Om Prakash Rehil Non-disposable trocar needle and handle
US20070143975A1 (en) * 2005-12-27 2007-06-28 Groz-Beckert Kg Felting needle
US7246418B2 (en) * 2005-12-27 2007-07-24 Groz-Beckert, Kg Felting needle
CN101481858B (zh) * 2008-01-10 2013-08-21 风琴针株式会社 缝纫机针
CN108442053A (zh) * 2018-06-07 2018-08-24 湖州三杰服饰有限公司 一种童装缝纫专用针

Also Published As

Publication number Publication date
CS154697B2 (show.php) 1974-04-30
JPS5248838Y2 (show.php) 1977-11-07
DE2137307A1 (de) 1972-03-30
FR2107527A5 (show.php) 1972-05-05
GB1365546A (en) 1974-09-04
JPS47195U (show.php) 1972-04-20
BR7106098D0 (pt) 1973-02-22

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SINGER SPEZIALNADELFABRIK GMBH, BAHNHOFSTR. 41-79,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE, A CORP OF NJ;REEL/FRAME:004647/0795

Effective date: 19861217

AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202