US3083661A - Thread pull-off for sewing machines - Google Patents

Thread pull-off for sewing machines Download PDF

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Publication number
US3083661A
US3083661A US846130A US84613059A US3083661A US 3083661 A US3083661 A US 3083661A US 846130 A US846130 A US 846130A US 84613059 A US84613059 A US 84613059A US 3083661 A US3083661 A US 3083661A
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United States
Prior art keywords
thread
pull
needle bar
needle
take
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
US846130A
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English (en)
Inventor
William E Patrick
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 US846130A priority Critical patent/US3083661A/en
Priority to ES0261631A priority patent/ES261631A1/es
Priority to CH1143060A priority patent/CH389374A/de
Application granted granted Critical
Publication of US3083661A publication Critical patent/US3083661A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors

Definitions

  • the present invention relates to sewing machines and, more particularly, to a thread pull-off for sewing machines.
  • the needle thread is usually run from a supply through a tension device and take-up mechanism to the needle and then to the work.
  • the take-up mechanism tensions the thread by pulling on it between the end that is anchored in the work and the tension device, which is adjustable and which at a particular setting offers a certain specific resistance to drawing thread from the supply.
  • the tension device determines the amount of tension that the take-up mechanism can apply to the thread in that any tension applied to the thread greater than the resistance oifered by the tension device at the particular setting will pull thread through the tension device from the supply.
  • the tension device determines the stitch setting characteristics of the machine.
  • the total tension on the thread is not solely a function of the tension device since the thread guides and other elements of the thread handling system also offer a resistance to the passage of the thread and, in addition, there is a certain pull required to draw the thread from the supply.
  • the resistance to the passage of the thread otiered by most of the various elements in the thread system is substantially constant 'from stitch to stitch. This is not always true, however, of the etfort required to pull thread off the supply.
  • the thread supply usually consists of a thread spool mounted on a spool pin on the top of the bracket arm of the machine and when thread is pulled from the supply, the entire spool is rotated. Pulling thread from the supply occurs in a very small portion of the sewing cycle and is very quick so that, in eflfect, the thread is pulled in jerks.
  • a thread pull-01f means for a sewing machine which means will provide a slack thread on the supply side of the tension device for every stitch, thereby efiectively isolating the thread supply from the thread tension system and providing a more nearly uniform thread tension. More particularly, it is an object of this invention to provide a thread pull-ofi means that is simple and economical, and at the same time, effective and reliable.
  • the arrangement of the pulloff finger on the needle bar driving crank provides for the use of a simple and economical element having an orbital movement which, in use for example with a link take up, is automatically optimumly timed with respect to stitch setting, will uniformly engage and release the thread upon each stitch, can be substantially concealed within the frame of the machine, and comprises a smooth and readily balanced action.
  • FIG. 1 is a fragmentary elevational view of the head end of a sewing machine embodying the present invention
  • FIG. 2 is a fragmentary detail view in elevation of that portion of FIG. 1 showing the thread pull-off, but with the parts in a diflerent operative position,
  • FIG. 3 is a fragmentary vertical sectional view longitudinally of the sewing machine of FIG. 1,
  • FIG. 4 is a fragmentary vertical sectional view taken substantially on the line 44 of FIG. 3,
  • FIG. 5 is a schematic view showing the paths of motion of the take-up lever and the pull-01f finger of the machine.
  • the machine includes a frame having a bed defining a work supporting surface 1 and a bracket arm 2 overhanging the work supporting surface 1 and terminating in a head 3.
  • a needle bar 4 carrying a needle 5 at its lower end.
  • the needle 5 is adapted to penetrate work on the work supporting surface 1 and cooperate therebeneath with a loop taker (not shown) in the formation of lock stitches.
  • the needle bar 4 is adapted to be oscillated to vibrate the needle 5 laterally of the line of feed.
  • the needle bar 4 is supported in the lower portion of the head 3 by a spherical bearing 6 which provides for endwise reciprocation of the needle bar 4 and for universal pivotal movement as defined by the bearing 6.
  • the needle bar 4 is journaled in a bore 7 in a gate member 8 that is pivotally mounted on a presser bar bushing 9 and is Accordingly, it is an object of this invention to pro-connected by a link 10 to a zigzag mechanism for im- 3. parting vibrations to the needle bar 4 for moving the needle 5 laterally of the line of feed.
  • The. details of the above mechanism form no part of the present invention ,and so are not herein disclosed.
  • the disclosed mechanism is substantially the same as in the above mention Johnson patent, No. 2,862,468, to which reference may be had for a. more detailed disclosure thereof.
  • a Endwise reciprocation is imparted to the needle bar 4 by a counterbalanced crank 11 mounted on the head end of a main shaft 12 journaled longitudinally of the bracket arm 2
  • a crank pin 13 is secured in the crank 11 by a set screw 14.
  • One end of a connecting link 15 is provided with a hub 16 having a bore for receiving the crank pin 13, the hub 16 having a reduced portion 17 received Within a recess in the crank 11.
  • the other end of the link 15 has a bore 19 slidably receiving a pin 20 having integral thereofspaced cheeks 21 disposed upon opposite sides of the needle bar 4.
  • the cheeks 21 support a cross pin 22 having a vertical bore 23 for receiving the needle bar 4 and a set screw 24 for locking the same relatively to the needle bar.
  • the take-up mechanism of the machine is of a conventional link type and comprises a take-up lever 25 pivotally mounted atone end on the crank pin 13 and having a free opposite end extending through a vertical slot 26 to the exterior of the head.
  • a threading eye 27 is formed in the free end of the take-up lever.
  • the take-up lever25 is pivotally connected by a pin 28 to one end of an anchor link 29 that is pivotally connected at its other end by a pivot screw 38 to a boss 31 formed in the head 3.
  • the thread pull-off mechanism in accordance with this invention comprises a planar thread pull-off element 32 formed of sheet metal and secured to the needle bar driving link-15.
  • the element 32 is provided with a hole 33 receiving the reduced end 17 of the'hub 16 of the link 15 and has an arm 34 secured to the face of the link -15 by a screw 35.
  • the element 32 has a pull-01f finger 36 having a free end 37 formed on the underside thereof with a thread-engaging surface 38. Upon rotation of the crank 11, the free end 37 of the finger 36 is projected through a vertically-arranged slot 39in the front wall of the head 3.
  • a plate 41 Secured'on'the front face of the head 3, as by n'vets 40, is a plate 41 having'a slot 42 substantially coinciding with the slot 39 in the head 3.
  • the plate 41 carries a first thread guide 43 on one side of the slot 42 and a second guide 44 on the other side of the slot 42.
  • the guides43 and 44 are designed to direct the thread lead laterally across the slot 42 at a point intermediate the ends of the slot 42.
  • the machine includes a thread tension device 45, for example, of the type illustrated in the United States patent application of Johnson, Serial No. 692,323, filed October 26, 1957, now Patent No. 2,955,775.
  • this thread tension device comprises a mounting stud 46 on which are arranged a' plurality of tension discs 47 that are biasedinto engagement with each other by a spring (not shown) disposed within a pair of telescoping spring covers 48, the compression of the spring'and thus the tension imposed upon a thread adapted to pass between the discs 47 being regulated by an adjusting nut 49.
  • the tension device also includes a check spring 50 and a guard plate 51.
  • a stop plate 52 is disposed between the tension device and the face of the-head 3 and is adjustably secured thereto by a screw 53.
  • the stop plate 52 iucludesan abutment 54- for the check spring '50 and a guar'd55 to facilitate threading.
  • Behind the stop plate 52 there: is disposed a plate 56 carrying thread guides 57 and 58.
  • the thread supply in the illustrated machine comprises a thread spool 59 mounted on a spool pin 60 on the top of the bracket arm 2. From the spool 59, the thread T passes through a guide 61 to the guide 43 of the plate 41 andthen laterally across the slot 42 to the guide 44.
  • the thread passes through the tension device 45' between a pair of the tension discs 47 and around the stud 46, through a guide 62 formed on the guard plate 51, the check spring 50, guide 58, the eye 27 of the take-up lever 25, the a-guide 57, guide 63 mounted beneath the head 3, and a pair of guides 64 and 65 on a needle clamp 66, to the eye of the needle 5.
  • the crank 11 is rotated to move the crank pin 13 in the direction of the arrow.
  • the take-up lever 25 is simultaneously approaching the top of its stroke.
  • the take-up lever is pulling the sewing thread to set the stitch in the work and, in the final movements, drawing thread into the system through the tension device from the supply to replace the thread that was consumed in the stitch.
  • the take-up lever 25 then begins to descend to make slack thread available for forming the next stitch and the needle bar 4 begins to descend. It is at this time in the cycle that the thread pull-off acts to pull thread from the supply to make slack thread available on the supply side of the tension device.
  • the thread limb between the guides 43 and 44 is expanded to the same extent as on the previous stitch, drawing from the spool 53 only the amount of thread'required to replace the thread drawn from there into thethread system.
  • a sewing machine having a frame including a head, a, needle bar mounted in said head for endwise reciprocation, a rotary shaft journaled in said frame and extending into said head, a crank on said shaft within said head, a crank pin carried by said crank, a needle bar driving link pivotally connected at one end to said crank pin and at the other end to said needle bar for imparting endwise reciprocation to said needle bar upon rotation of said shaft, a take-up mechanism comprising a take-up lever pivotally mounted at one end on said crank pin and having a thread eye at the other end, an anchor link pivotally connected at one end to an intermediate point of said take-up lever and at the other end to said frame, a tension device disposed between said take-up mechanism and the thread supply, and a thread pull-0E mechanism disposed on the thread supply side of said tension device and comprising a pull-oft element on said needle bar driving link and having a thread engaging free end movable in a plane parallel to the plane of movement of said needle bar driving link and having having
  • a sewing machine having a frame including a head, a needle bar mounted in said head for endwise reciprocation, a rotary shaft journaled in said frame and extending into said head, a crank on said shaft within said head, a crank pin carried by said crank, a needle bar driving link pivotally connected at one end to said crank pin and at the other end to said needle bar for imparting endwise reciprocation to said needle bar upon rotation of said shaft, a take-up mechanism comprising a take-up lever pivotally mounted at one end on said crank pin and having a thread eye at the other end, an anchor link pivotally connected at one end to an intermediate point of said take-up lever and at the other end to said frame, a tension device disposed between said take-up mechanism and the thread supply and a thread pull-off mechanism disposed on the thread supply side of said tension device and com-prising a pull-ofl'f element formed of sheet metal and having a thread engaging free end, means for pivotally mounting said element on said crank pin at one point and releas

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US846130A 1959-10-13 1959-10-13 Thread pull-off for sewing machines Expired - Lifetime US3083661A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US846130A US3083661A (en) 1959-10-13 1959-10-13 Thread pull-off for sewing machines
ES0261631A ES261631A1 (es) 1959-10-13 1960-10-11 Una maquina de coser
CH1143060A CH389374A (de) 1959-10-13 1960-10-12 Nähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US846130A US3083661A (en) 1959-10-13 1959-10-13 Thread pull-off for sewing machines

Publications (1)

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US3083661A true US3083661A (en) 1963-04-02

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US846130A Expired - Lifetime US3083661A (en) 1959-10-13 1959-10-13 Thread pull-off for sewing machines

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US (1) US3083661A (de)
CH (1) CH389374A (de)
ES (1) ES261631A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310015A (en) * 1963-04-18 1967-03-21 Gegauf Fritz Ag Sewing machine thread guiding means
US3408970A (en) * 1964-01-14 1968-11-05 Janome Sewing Machine Co Ltd Thread tensioning arrangement for sewing machines
US3496895A (en) * 1968-11-05 1970-02-24 Singer Co Needle thread snub
US3654883A (en) * 1970-05-14 1972-04-11 Union Special Machine Co Thread control mechanism for sewing machines
US4320712A (en) * 1979-06-18 1982-03-23 The Singer Company Thread handling
US4757776A (en) * 1986-03-20 1988-07-19 Brother Kogyo Kabushiki Kaisha Thread pull-out mechanism for a sewing machine
US20040129191A1 (en) * 2002-11-15 2004-07-08 Hirofumi Tamai Method and system for preventing thread breakage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH640281A5 (de) * 1979-05-23 1983-12-30 Gegauf Fritz Ag Fadenabzugvorrichtung an einer naehmaschine.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US557730A (en) * 1896-04-07 Thread-pull-off device for sewing-machines
US1133608A (en) * 1910-11-02 1915-03-30 Singer Mfg Co Sewing-machine.
US1166834A (en) * 1913-05-16 1916-01-04 Singer Mfg Co Take-up mechanism for sewing-machines.
US1549081A (en) * 1921-10-29 1925-08-11 Hohmann Sewing Machine Company Rotary take-up for sewing machines
US2430084A (en) * 1944-10-12 1947-11-04 Union Special Machine Co Take-up means for sewing machines
US2704987A (en) * 1951-01-22 1955-03-29 Mefina Sa Mechanism for actuating the needle bar and thread puller in a sewing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US557730A (en) * 1896-04-07 Thread-pull-off device for sewing-machines
US1133608A (en) * 1910-11-02 1915-03-30 Singer Mfg Co Sewing-machine.
US1166834A (en) * 1913-05-16 1916-01-04 Singer Mfg Co Take-up mechanism for sewing-machines.
US1549081A (en) * 1921-10-29 1925-08-11 Hohmann Sewing Machine Company Rotary take-up for sewing machines
US2430084A (en) * 1944-10-12 1947-11-04 Union Special Machine Co Take-up means for sewing machines
US2704987A (en) * 1951-01-22 1955-03-29 Mefina Sa Mechanism for actuating the needle bar and thread puller in a sewing machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310015A (en) * 1963-04-18 1967-03-21 Gegauf Fritz Ag Sewing machine thread guiding means
US3408970A (en) * 1964-01-14 1968-11-05 Janome Sewing Machine Co Ltd Thread tensioning arrangement for sewing machines
US3496895A (en) * 1968-11-05 1970-02-24 Singer Co Needle thread snub
US3654883A (en) * 1970-05-14 1972-04-11 Union Special Machine Co Thread control mechanism for sewing machines
US4320712A (en) * 1979-06-18 1982-03-23 The Singer Company Thread handling
US4757776A (en) * 1986-03-20 1988-07-19 Brother Kogyo Kabushiki Kaisha Thread pull-out mechanism for a sewing machine
GB2188070B (en) * 1986-03-20 1990-02-14 Brother Ind Ltd Sewing machine
US20040129191A1 (en) * 2002-11-15 2004-07-08 Hirofumi Tamai Method and system for preventing thread breakage
US6840185B2 (en) 2002-11-15 2005-01-11 Muscle Corporation Method and system for preventing thread breakage

Also Published As

Publication number Publication date
CH389374A (de) 1965-03-15
ES261631A1 (es) 1961-12-16

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