US2937605A - Thread tension devices - Google Patents

Thread tension devices Download PDF

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Publication number
US2937605A
US2937605A US715281A US71528158A US2937605A US 2937605 A US2937605 A US 2937605A US 715281 A US715281 A US 715281A US 71528158 A US71528158 A US 71528158A US 2937605 A US2937605 A US 2937605A
Authority
US
United States
Prior art keywords
thread
stud
check spring
take
flange
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
US715281A
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English (en)
Inventor
Earl F Dunn
Stanley M Sliva
Francis L Walling
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 Co
Original Assignee
Singer Co
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 Singer Co filed Critical Singer Co
Priority to US715281A priority Critical patent/US2937605A/en
Priority to GB3300/59A priority patent/GB863696A/en
Priority to DES61605A priority patent/DE1138610B/de
Application granted granted Critical
Publication of US2937605A publication Critical patent/US2937605A/en
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
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers

Definitions

  • This invention relates to thread tension devices for sewing machines.
  • the elements which control the needle thread of a lock stitch sewing machine from a thread supply to the needle include a thread tensioning device, a check spring and a take-up.
  • the take-up serves to draw in and give out thread in accordance with the demands of the stitch forming instrumentalities; the tensioning device establishes the degree of tension in the thread when all the slack has been taken up, and the check spring serves as a small, quick acting auxiliary take-up in which capacity it cushions shock loading in the thread and tailors the action of the main take-up on the thread.
  • the length of thread from the tensioning device to the needle should be held to a minimum for the reason that thread has certain inherent elastic properties and the amount that the thread will stretch when tensioned will increase as its length increases. The shorter the length of thread from the tensioning device to the needle, therefore, the more accurate and predictable will be the control exercized thereon by the take-up.
  • FIG. 1 represents an end elevational view of a sewing machine bracket arm illustrating a rotary take-up mechanism partly broken away and having the thread tensioning unit of this invention applied thereto,
  • Fig. 2 is an enlarged cross-sectional view of the thread tensioning unit
  • Fig. 3 represents an exploded perspective view of the thread tensioning unit
  • Fig. 4 represents a perspective view of the guard member of the thread tension-ing unit.
  • a sewing machine bracket arm is indicated at 10 closed at the end by a cover plate 11.
  • a rotary take-up member 13 Extending outside the cover plate and carried for turning movement with an arm shaft 12 in the bracket arm is a rotary take-up member 13 shielded by a take-up guard 14 which extends in spaced relation to the cover plate to define therebetween a thread receiving slot through which a thread may be introduced to the take-up member.
  • a needle bar 15 carrying a needle 16 is journaled for endwise reciprocation in the sewing machine bracket aim.
  • a presser bar 17 is also journaled for endwise movement in the bracket arm and has a presser foot 18 secured thereto.
  • a thread guide 19 carried for movement with the presser bar extends through a slot 20 in the cover plate.
  • a thread tensioning unit which includes a check spring 22.
  • the tensioning unit is carried on the sewing machine bracket arm beneath the rotary take-up member and at one side of the thread guide 19.
  • a needle thread is illustrated in solid lines in the position it will occupy during stitching operations, and in phantom lines in two positions A and B that it will occupy when it is being threaded.
  • the thread after passing through the tensioning unit and over the check spring leads through the thread guide 19, over the take-up member 13, through a thread guide 23 on the cover plate 11, through a wire thread guide 24 onthe needle bar, and then to the needle.
  • the thread tensioning unit 21 comprises a stud 30 formed at one extremity with external threads 31 and an attenuated slot 32 and at its other extremity with a short slot 33. Secured to thestud 30 i by means of a set screw 34 is a collar 35 formed with an external annular groove 36 and with a counterbore 37.'
  • An opening 38 is formed through the side wall of the collar 35 near its free end which presents a flat circular.
  • Approximately half of the periphery of the back portion 41 of the guard member is formed with a wide flange 45 which extends substantially parallel to the axis of the stud 30, the remaining half of the periphery of the back portion 41 of the guard may be considered as coinciding with a gap in the flange 45.
  • a thread entrance slot 46 is formed in the flange 45 and at one end opens into the gap.
  • the flange is formed with a finger 47 which projects outwardly substantially in continuation on the flange.
  • a disc 48 of frictioning material such as felt, leather, etc., is disposed on the stud against the bearing ring 44 of the guard member.
  • a thread-engaging wheel 49 is loosely journaled on the stud against the disc 48.
  • the periphery of the wheel is preferably formed with a plurality of radially extending fingers 50 which are bent outwardly alternately in opposite directions so as to provide a V-shaped thread-engaging rim for engagement with the thread.
  • a second frictioning disc 51 identical with the disc 48 is disposed on the stud at the opposite side of the thread-engaging wheel.
  • a pressure disc 52 is disposed on the stud and formed on the inside face with a raised serrated bearing ring 53 which bears against the frictioning disc 51.
  • a pin 54 driven into the pressure disc 52 extends into the attenuated slot 32 in the stud so as to prevent rotation of the pressure disc with respect to the stud.
  • the periphery of the pressure disc is preferably formed with a continuous flange 54 externally tapered inwardly and disposed to overlie the rim of the thread-engaging wheel to cam a thread properly into engagement within the V-shaped rim of the wheel.
  • a beehive spring 55 is constrained on the stud between the pressure disc 52 and a knurled nut 56 on the threads 31 of the stud.
  • the pressure exerted on the thread-engaging wheel between the discs 48 and 51 of frictioning material may be adjusted by means of the knurled nut 56.
  • the check spring 22 comprises a series of coils 57 disposed about the stud 30 and within the counterbore 37.
  • An inturned extremity 53 of the check spring extends into the short slot 33 of the stud and serves to anchor the check spring thereon.
  • the opposite extremity of the check spring is formed with a radial arm 59 which extends through the opening 38 in the wall of the collar and is bent into a loop 60 which extends across the periphery of the guard member 42 in the gap of the flange 45 thereon and, therefore, also extends across the rim of the thread-engaging wheel 49.
  • the free extremity 61 of the check spring loop 60 is bent to extend substantially parallel to the pressure disc 52 and to a position between the stud 30 and the finger 47 on the guard member.
  • the thread tensioning unit is preferably secured to the bracket arm of the sewing machine with the finger 47 of the guard member disposed substantially on a line between the stud 30 and the axis of turning movement of the rotary take-up member as indicated by the arm shaft 12.
  • a thread limb leading from a supply is grasped by the machine operator and directed into the thread entrance slot 46 of the thread tensioning unit which delivers the thread directly to the rim of the thread engaging wheel.
  • the operator then draws the limb of the thread once around the wheel and into the position marked A" in Fig. l in which the thread has been drawn under the finger 47 and under the free extremity 61 of the check spring.
  • the operator draws the limb of the thread back, i.e., to the right in Fig. 1, the thread being guided by the flange 45 over the check spring extremity 61 and under the finger 47.
  • Fig. 1 illustrates how close to the check spring the thread must be drawn in threading the take-up.
  • the grasped thread limb will extend over the finger 47 which will prevent the thread from passing around the free extremity 61 of the check spring a second time.
  • the tensioning device of this invention may thus be threaded quickly and without special care on the part of the machine operator and the danger of fouling the thread by engagement twice with the check spring is minimized.
  • a thread tensioning device for a sewing machine comprising a stud adapted to be fixed in said sewing machine, thread tensioning means on said stud, a guard disc locked against turning movement on said stud at one side of said thread tensioning means, a laterally extending flange on the periphery of said guard disc arranged to span said thread tensioning means, said flange formed with a gap extending over a portion of the periphcry of said guard disc, a laterally projecting finger on said flange at the edge of said gap at check spring anchored on said stud and extending transversely across the periphery of said guard disc in said flange gap, a free extremity on said check spring formed to extend toward said flange and between said laterally extending finger and said stud.
  • a thread tensioning device for a sewing machine comprising a stud adapted to be fixed in said sewing machine, a thread engaging wheel journaled for turning movement on said stud, means on said stud for imparting a frictional resistance to turning movement of said wheel, a guard disc locked against turning movement on said stud at one side of said thread engaging wheel, a laterally extending flange on the periphery of said guard disc arranged to span said thread engaging wheel, said flange formed with a gap extending over a portion of the periphery of said guard disc, said flange formed with a thread receiving slot opening into said gap at one end of said flange and disposed substantially in the plane of said thread engaging wheel, a laterally extending finger formed on said flange adjacent said gap at the opposite end of said flange, a check spring anchored on said stud and extending transversely across the periphery of said guard disc in said flange gap, and a free extremity on said check spring formed to extend substantially parallel to said guard disc and between the
  • a sewing machine having a single bracket arm, a rotary take-up in said bracket arm, a tensioning unit detachably secured to said sewing machine bracket arm beneath said rotary take-up member, a thread tensioning device associated with said tensioning unit for imparting frictional resistance to movement of a thread from a supply to the rotary take-up, a check spring anchored on said tensioning unit, a free extremity formed with a loop on said check spring for engagement with a thread extending from the thread tensioning device to said takeup, a thread guide, means supporting said thread guide on said sewing machine bracket arm for engagement with the thread extending from the check spring to the takeup, and a guard member fixedly secured to said tensioning unit, a finger formed on said guard member and disposed extending across the looped free extremity of said check spring and at a point substantially between the thread guide and the path of the periphery of said rotary takerup to prevent double threading of said check spring.
  • a thread tensioning device comprising a stud fixed in said bracket arm substantially perpendicular to said end cover plate and beneath said rotary take-up member, a thread engaging wheel journaled for turning movement on said stud, means on said stud for imparting a frictional resistance to turning movement of said wheel, a guard member locked against turning movement on said stud between said thread engaging wheel and said end cover plate, a finger extending from said guard member outwardly away from said end cover plate, said finger arranged to span the periphery of said thread engaging wheel at a point between the stud of said thread tensioning device and the axis of movement of said rotary take-up member, a check spring anchored on said stud and extending transverselyacross the periphery of said thread engaging wheel, and a free extremity on said check spring formed to extend substantially parallel to said

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US715281A 1958-02-14 1958-02-14 Thread tension devices Expired - Lifetime US2937605A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US715281A US2937605A (en) 1958-02-14 1958-02-14 Thread tension devices
GB3300/59A GB863696A (en) 1958-02-14 1959-01-29 Thread tensioning device in sewing machines
DES61605A DE1138610B (de) 1958-02-14 1959-02-03 Fadenspanneinrichtung fuer eine Naehmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US715281A US2937605A (en) 1958-02-14 1958-02-14 Thread tension devices

Publications (1)

Publication Number Publication Date
US2937605A true US2937605A (en) 1960-05-24

Family

ID=24873392

Family Applications (1)

Application Number Title Priority Date Filing Date
US715281A Expired - Lifetime US2937605A (en) 1958-02-14 1958-02-14 Thread tension devices

Country Status (3)

Country Link
US (1) US2937605A (de)
DE (1) DE1138610B (de)
GB (1) GB863696A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041008A (en) * 1958-12-23 1962-06-26 Singer Mfg Co Thread tension device for sewing machines
US3288094A (en) * 1963-09-16 1966-11-29 Union Special Machine Co Blindstitch sewing machine
US4545311A (en) * 1984-08-02 1985-10-08 The Singer Company Thread tensioning device for a sewing machine
US4991526A (en) * 1989-07-20 1991-02-12 Jeanblanc Ferdinand H Bed plate insert and presser foot, each having a guide surface for laterally supporting a sewing machine needle
DE4141945C1 (en) * 1991-12-19 1992-12-03 Duerkopp Adler Ag, 4800 Bielefeld, De Sewing machine thread tensioner - has tensioning element in effective connection with electromagnet
US5191847A (en) * 1991-04-16 1993-03-09 The Singer Company N.V. Tension regulating device
US5377606A (en) * 1992-04-27 1995-01-03 Juki Corporation Thread tensioning device for sewing machine
US7111568B1 (en) * 2005-08-16 2006-09-26 Suzuki Manufacturing, Ltd. Cover stitch sewing machine
CN102747542A (zh) * 2012-06-20 2012-10-24 吴江市隆泰喷织厂 一种缝纫机稳定型紧线器
US8468962B2 (en) * 2011-09-16 2013-06-25 Zeng Hsing Industrial Co., Ltd. Sewing machine with a thread holding device for holding needle thread remaining
CN103422266A (zh) * 2012-05-17 2013-12-04 顾飞龙 缝纫机夹线调整旋钮
CN103422265A (zh) * 2012-05-17 2013-12-04 顾飞龙 缝纫机的缝线张力调整机构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176940A (en) * 1963-01-10 1965-04-06 United Aircraft Corp Helicopter pod positioning and supporting means

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US383748A (en) * 1888-05-29 Sewing-machine
US413657A (en) * 1889-10-29 James e
US875610A (en) * 1903-03-26 1907-12-31 William N Parkes Thread-controlling mechanism for sewing-machines.
US2462812A (en) * 1946-02-09 1949-02-22 Singer Mfg Co Thread-tension device for sewing machines
US2810532A (en) * 1954-11-23 1957-10-22 Singer Mfg Co Thread tensioning device for sewing machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2390681A (en) * 1941-11-05 1945-12-11 Willcox & Gibbs Sewing Machine Thread take-up device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US383748A (en) * 1888-05-29 Sewing-machine
US413657A (en) * 1889-10-29 James e
US875610A (en) * 1903-03-26 1907-12-31 William N Parkes Thread-controlling mechanism for sewing-machines.
US2462812A (en) * 1946-02-09 1949-02-22 Singer Mfg Co Thread-tension device for sewing machines
US2810532A (en) * 1954-11-23 1957-10-22 Singer Mfg Co Thread tensioning device for sewing machines

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3041008A (en) * 1958-12-23 1962-06-26 Singer Mfg Co Thread tension device for sewing machines
US3288094A (en) * 1963-09-16 1966-11-29 Union Special Machine Co Blindstitch sewing machine
US4545311A (en) * 1984-08-02 1985-10-08 The Singer Company Thread tensioning device for a sewing machine
US4991526A (en) * 1989-07-20 1991-02-12 Jeanblanc Ferdinand H Bed plate insert and presser foot, each having a guide surface for laterally supporting a sewing machine needle
US5191847A (en) * 1991-04-16 1993-03-09 The Singer Company N.V. Tension regulating device
US5363786A (en) * 1991-12-19 1994-11-15 Durkopp Adler Aktiengesellschaft Thread tensioning device having an electromagnet for applying a variable force opposing rotation of a tensioning element
DE4141945C1 (en) * 1991-12-19 1992-12-03 Duerkopp Adler Ag, 4800 Bielefeld, De Sewing machine thread tensioner - has tensioning element in effective connection with electromagnet
US5377606A (en) * 1992-04-27 1995-01-03 Juki Corporation Thread tensioning device for sewing machine
US7111568B1 (en) * 2005-08-16 2006-09-26 Suzuki Manufacturing, Ltd. Cover stitch sewing machine
US8468962B2 (en) * 2011-09-16 2013-06-25 Zeng Hsing Industrial Co., Ltd. Sewing machine with a thread holding device for holding needle thread remaining
CN103422266A (zh) * 2012-05-17 2013-12-04 顾飞龙 缝纫机夹线调整旋钮
CN103422265A (zh) * 2012-05-17 2013-12-04 顾飞龙 缝纫机的缝线张力调整机构
CN103422265B (zh) * 2012-05-17 2018-11-27 顾飞龙 缝纫机的缝线张力调整机构
CN102747542A (zh) * 2012-06-20 2012-10-24 吴江市隆泰喷织厂 一种缝纫机稳定型紧线器

Also Published As

Publication number Publication date
DE1138610B (de) 1962-10-25
GB863696A (en) 1961-03-22

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