US3154035A - Thread winding control mechanism for sewing machines - Google Patents

Thread winding control mechanism for sewing machines Download PDF

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Publication number
US3154035A
US3154035A US280347A US28034763A US3154035A US 3154035 A US3154035 A US 3154035A US 280347 A US280347 A US 280347A US 28034763 A US28034763 A US 28034763A US 3154035 A US3154035 A US 3154035A
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United States
Prior art keywords
bobbin
thread
loop
needle
taker
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
US280347A
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English (en)
Inventor
William J Edwards
Wayne C Sockwell
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 US280347A priority Critical patent/US3154035A/en
Priority to GB19504/64A priority patent/GB994629A/en
Priority to FR974141A priority patent/FR1393072A/fr
Priority to CH633464A priority patent/CH425422A/de
Application granted granted Critical
Publication of US3154035A publication Critical patent/US3154035A/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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/26—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices
    • D05B57/265—Bobbin holders or casings; Bobbin holder or case guards; Bobbin discharge devices for looptakers with vertical axis
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith

Definitions

  • This invention relates to lock stitch sewing machines having mechanism associated therewith for replenishing thread on the bobbin, and this invention is especially useful and advantageous as embodied in a lock stitch sewing machine provided with means for replenishing thread on a bobbin in place in the loop-taker during such interrelated motion of the needle and loop-taker as is required for the formation of lock stitches. More particularly, this invention relates to mechanisms associated with such sewing machine bobbin winding mechanisms for signalling the fully wound condition of the bobbin and for preventing over-winding of the bobbin.
  • FIG. 1 represents a vertical cross sectional view of a sewing machine having this invention applied thereto
  • FIGS. 2, 3 and 4 each represents an enlarged vertical cross-sectional view taken substantially along line Z2 of FIG. 1 of the loop-taker including fragments of the stitch forming instrumentalities which cooperate with the loop-taker, together with an elevational view of a portion of the bobbin thread replenishing lever shifted approximately 90 about the axis of the loop-taker drive shaft more clearly to illustrate the relationship of the parts and in which,
  • FIG. 2 illustrates the position of the parts at the initiation of bobbin thread replenishment
  • FIG. 3 illustrates the position of the parts when the bobbin becomes fully wound
  • FIG. 4 illustrates the position of the parts when the bobbin thread replenishing mechanism has been rendered ineffective by the sewing machine operator and at the initiation of stitch formation
  • FIG. 5 is a perspective view of the bobbin thread sensing element
  • FIG. 6 represents a top plan view of the loop taker
  • FIG. 7 is a graph indicating th preferred speed-torque characteristics of an electric motor adapted for use with this invention.
  • the sewing machine illustrated in the drawings including the stitch forming instrumentalities and the provisions therein whereby a bobbin thread may be replenished on a bobbin in place in the loop-taker during such interrelated movements of the needle and loop-taker as are required for the formation of lock stitches are similar to that disclosed in the United States Patent of S. J. Ketterer, No. 3,115,855, December 31, 1963.
  • the control mechanism for initiating bobbin thread replenishment, determining selectively the amount of thread to be replenished on the bobbin, and terminating the operation of the bobbin thread replenishing operation is similar to that dis- 3,35%,fl35 Patented Unit. 27., 1964 closed in the copending United States patent application of W. I. Edwards, Serial No. 280,388, filed May 14, 1963.
  • the sewing machine frame comprises a bed 11, a standard 12 rising from the bed, and a bracket arm 13 extending over the bed.
  • a main shaft 14 journaled in the bracket arm is operatively connected to impart endwise reciprocatory movement to a thread carrying needle 15.
  • the main shaft 14 is also operatively connected by means of a standard shaft 16, a bed shaft 17, a loop-taker shaft 18 and meshing gears 19, 2d, and 21, therebetween, to impart rotary motion to a loop-taker 22 secured on the looptaker shaft in timed relation with the needle reciprocation and preferably at the rate of twoloop-taker revolutions for each needle reciprocation.
  • the needle passes endwise through a needle aperture 23 in a throat plate 24 carried on the sewing machine bed.
  • the throat plate is also slotted as at 25 to accommodate a work feeding dog 26 which is preferably driven in a conventional fashion from the actuating mechanism for the needle and loop-taker, that is, from the main shaft 14 or the standard or bed shafts connected thereto, so as to cooperate with the needle and loop-taker in forming lock stitches in a work fabric W constrained on the throat plate by a presser foot 27 spring biased downwardly from the bracket arm.
  • the loop-taker 22 includes a cup-shaped body portion 343 formed with a loop seizing beak 31, in which body portion is journaled a bobbin case 32 which is restrained against rotation by rotation restraining members 33 and 33' carried by the bed.
  • a bobbin 34 is ordinarily free to turn in the bobbin case, being supported therein by a top flange 35 of the bobbin which rests on the bobbin case and is centered thereon by a spring biased arm 36 pivoted on a pin 3'7 in the bobbin case.
  • the arm 36 is formed with a depending spherical protuberance 38 accommodated in a spherical seat 39 formed in the top flange 35 of the bobbin.
  • the bobbin 34 also includes a bottom flange id somewhat smaller in diameter than the top flange 35. T he arm 36, in bearing downwardly on the bobbin, thus provides a frictional force between the bobbin and the bobbin case resisting turning of the bobbin and providing a tension on the bobbin thread during sewing operation.
  • the stitch forming mechanism above described may be operated so as to introduce to the bobbin a loop of the thread carried by the needle and to Wind the thread on the bobbin to replenish the under or locking thread supply during continued interrelated movement of the needle and loop-taker as is required for the formation of lock stitches.
  • Instrumental in bobbin thread replenishment is a bobbin winding member 5% carried within the looptaker body portion beneath the bobbin on a rod 51 slidable in an axial bore 52 in the loop-taker shaft 18.
  • the bobbin winding member includes a pin 53 engageable in an arcuate slot 54 in the undersurface of the bottom flange 4b of the bobbin to drive the bobbin when the bobbin winding member is raised.
  • the bobbin winding member is also provided with an annular rib 55 slightly larger in diameter than the lower flange 4b of the bobbin, which rib embraces the lower bobbin flange when the bobbin winding member is raised.
  • a washer 5'7 fixed rotatably with the rod 51 is formed with a tang 58 interlocked in an aperture 5% in the gear 21 on the loop-taker shaft 18 so as to drive the rod 51 in timed relation with the looptaker.
  • the stitch forming mechanism thus far described and, in particular, the bobbin winding member 50 cooperating with the stitch forming mechanism as described in greater detail in the above referred to Patent No. 3,115,- 855, serves to deflect the needle thread loop into the bobbin upon initiation of bobbin thread replenishment.
  • the rib 55 of the bobbin winding member 50 serves a novel function having to do with preventing overwinding or spilling of thread from the bobbin during replenishment thereof.
  • the vertical position of the bobbin winding member 50, and thus initiation and completion of bobbin replenishment, is controlled by a thread replenishing lever 60 fulcrumed at 61 in the sewing machine bed.
  • the lever 60 is connected to the rod 51 by means of a stout leaf spring 62 secured to the lever by fastening screws 63 and secured to the rod 51 by means of a nut 64.
  • winding of the bobbin will occur and when the push rod is released the bobbin winding will be terminated and the machine will revert to sewing.
  • the electric motor 95 is disposed in the standard at the juncture with the bed. Operation of the electric motor may be controlled by the operator as by a conventional knee or foot controlled rheostat (not shown).
  • the electric motor 95 is preferably of a type having a substantially drooping speed-torque characteristic as illustrated in the graph of FIG. 7. Typical of an electric motor having such characteristic is a series wound commutator motor.
  • FIG. 7 represents the actual speed torque characteristics of such an electric motor when full line voltage of 115 volts, 6O cycle alternating current is impressed across the motor leads.
  • an arm 100 of a bobbin thread sensing member 101 Disposed in a slot 08 formed in the bobbin case 32 and pivoted therein by a pin )9 is an arm 100 of a bobbin thread sensing member 101.
  • the inturned free eX- tremity of the arm 100 is formed with a vertically enlarged, slightly concave thread engaging shoe 102 which is arranged as illustrated in FIGS. 2, 3 and 4 projecting inwardly from the bobbin case and disposed between the flanges 35-40 of the bobbin.
  • the thread sensing member Extending from the bottom edge of the thread engaging shoe 102, the thread sensing member is formed with an upwardly and outwardly inclined cam surface 103.
  • the cam surface 103 engages the rim 55 of the bobbin winding member 50 at an angle as illustrated in FIG. 3 and thus gives rise to a force component tending to depress the bobbin winding member 50 and the rod 51 attached thereto.
  • the spring 62 will resist the downward urging of the rod 51 by the cam surface 103.
  • the spring constant of the spring 62 is such as to offer sufficient resisting force to the downward urging of the rod 51 as to give rise to sufficient increase in the torque demand applied to the actuating mechanism as to influence the speed characteristics of the electric motor 95.
  • the bobbin winding member When the push rod 70 is released to return the parts of the machine into a condition for sewing, the bobbin winding member will drop into the position illustrated in FIG. 4 and the rim 55 thereof will be lowered out of engagement with the cam surface 103 of the thread engaging shoe 102 thus releasing the sewing machine actuating mechanism from the frictional load imposed for the purpose of stalling the motor at the completion of bobbin winding.
  • a look stitch sewing machine having stitch forming instrumentalities including a needle and a loop taker, a flanged bobbin journaled relatively to said loop taker, actuating means interconnecting said needle and loop taker for interrelated movement as is required for the formation of lock stitches, a drive motor operatively connected to said actuating means, means for replenishing thread on said bobbin in place relatively to said loop taker during said interrelated motion of said needle and loop taker, including a bobbin winding member driven by said actuating means and shiftably supported between said loop taker and said bobbin for movement into and out of driving relation with said bobbin, a thread sensing member extending between said bobbin flanges and shiftable in response to a predetermined quantity of thread wound on said bobbin, and interengaging surfaces [formed on said thread sensing and bobbin winding members shiftable into frictional engagement in response to the sensing of a predetermined quantity of thread wound on said bobbin for stalling said drive motor when said drive motor, said drive
  • a lock stitch sewing machine having stitch forming instrumentalities including a needle and a loop taker, a bobbin case journaled in said loop taker, actuating means interconnecting said needle and loop taker for interrelated movement as is required for the formation of lock stitches, a drive motor operatively connected to said actuating means, means for replenishing thread on said bobbin in place in said bobbin case relatively to said loop taker during said interrelated motion of said needle and loop taker, said replenishing means including a bobbin winding member disposed between said loop taker and said bobbin, a rod secured to said bobbin winding member, means supporting said rod for endwise shifting movement relatively to said loop taker into and out of a bobbin Winding position, an operating lever for shifting said rod endwise, and spring means yieldingly interconnecting said rod with said operating lever, a thread sensing shoe shiftably supported on said bobbin case and disposed between said bobbin flanges to sense a predetermined quantity of thread wound on said bobbin, cam means
  • a look stitch sewing machine having stitch forming instrumentalities including a needle and a loop taker, a bobbin journaled relatively to said loop taker, actuating means interconnecting said needle and loop taker for interrelated movement as is required for the formation of lock stitches, an electric motor having a substantially drooping speed-load characteristic operatively connected to said actuating means, means driven by said actuating means for replenishing thread on said bobbin in place relatively to said loop taker during said interrelated motion of said needle and loop taker, means for sensing a predetermined quantity of thread Wound on said bobbin, and means responsive to operation of said bobbin thread sensing means for increasing the load applied on said actuating mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US280347A 1963-05-14 1963-05-14 Thread winding control mechanism for sewing machines Expired - Lifetime US3154035A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US280347A US3154035A (en) 1963-05-14 1963-05-14 Thread winding control mechanism for sewing machines
GB19504/64A GB994629A (en) 1963-05-14 1964-05-11 Thread winding control mechanism for sewing machines
FR974141A FR1393072A (fr) 1963-05-14 1964-05-12 Mécanisme de commande de bobinage du fil de canette pour machine à coudre
CH633464A CH425422A (de) 1963-05-14 1964-05-14 Doppelsteppstich-Nähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US280347A US3154035A (en) 1963-05-14 1963-05-14 Thread winding control mechanism for sewing machines

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US3154035A true US3154035A (en) 1964-10-27

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US (1) US3154035A (de)
CH (1) CH425422A (de)
GB (1) GB994629A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303802A (en) * 1964-02-19 1967-02-14 Singer Co Solenoid bobbin winders
US3407760A (en) * 1966-08-29 1968-10-29 Singer Co Bobbin thread replenishing mechanism for sewing machines
US3568616A (en) * 1969-10-02 1971-03-09 Singer Co Bobbin case for sewing machines
DE2219555A1 (de) * 1971-04-23 1972-11-09 Singer Co Fadenergänzungsvorrichtung für Nähmaschinen
US4232618A (en) * 1979-07-16 1980-11-11 The Singer Company Bobbin winder arrangement for sewing machine looptaker
US4326474A (en) * 1981-05-01 1982-04-27 The Singer Company In-place bobbin winding mechanism for a sewing machine
US4365567A (en) * 1978-06-30 1982-12-28 The Singer Company Modified thread control lever for a bobbin case

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923186A (en) * 1906-10-15 1909-06-01 Gen Electric Automatic motor control.
US1794255A (en) * 1927-09-12 1931-02-24 Gen Electric Sewing machine
US2255152A (en) * 1939-09-14 1941-09-09 White Sewing Machine Corp Bobbin winder for sewing machines
US3103189A (en) * 1961-08-25 1963-09-10 Singer Co Control mechanism for lock stitch sewing machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US923186A (en) * 1906-10-15 1909-06-01 Gen Electric Automatic motor control.
US1794255A (en) * 1927-09-12 1931-02-24 Gen Electric Sewing machine
US2255152A (en) * 1939-09-14 1941-09-09 White Sewing Machine Corp Bobbin winder for sewing machines
US3103189A (en) * 1961-08-25 1963-09-10 Singer Co Control mechanism for lock stitch sewing machines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303802A (en) * 1964-02-19 1967-02-14 Singer Co Solenoid bobbin winders
US3407760A (en) * 1966-08-29 1968-10-29 Singer Co Bobbin thread replenishing mechanism for sewing machines
US3568616A (en) * 1969-10-02 1971-03-09 Singer Co Bobbin case for sewing machines
DE2219555A1 (de) * 1971-04-23 1972-11-09 Singer Co Fadenergänzungsvorrichtung für Nähmaschinen
US4365567A (en) * 1978-06-30 1982-12-28 The Singer Company Modified thread control lever for a bobbin case
US4232618A (en) * 1979-07-16 1980-11-11 The Singer Company Bobbin winder arrangement for sewing machine looptaker
US4326474A (en) * 1981-05-01 1982-04-27 The Singer Company In-place bobbin winding mechanism for a sewing machine

Also Published As

Publication number Publication date
CH425422A (de) 1966-11-30
GB994629A (en) 1965-06-10

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