US3587493A - Bobbin thread replenishing mechanisms for sewing machine with oscillating shuttle - Google Patents

Bobbin thread replenishing mechanisms for sewing machine with oscillating shuttle Download PDF

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Publication number
US3587493A
US3587493A US11999A US3587493DA US3587493A US 3587493 A US3587493 A US 3587493A US 11999 A US11999 A US 11999A US 3587493D A US3587493D A US 3587493DA US 3587493 A US3587493 A US 3587493A
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United States
Prior art keywords
bobbin
thread
loop taker
shuttle
sewing machine
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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
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US11999A
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English (en)
Inventor
Michael F Ivanko
Stanley J Ketterer
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Singer Co
Original Assignee
Singer Co
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Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
Application granted granted Critical
Publication of US3587493A publication Critical patent/US3587493A/en
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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

Definitions

  • a lockstitch sewing machine having an oscillating loop taker is provided with a mechanism for replenishing thread on the bobbin while the bobbin is in place in the loop taker and while the loop taker partakes of the same oscillatory movement as during stitch formation. Means are disclosed for introducing thread to the bobbin in place on the loop taker, and a ratchet device is driven by the oscillating loop taker driver for turning the bobbin in only one direction to wind the thread thereon.
  • bobbin thread has been replenished successfully on a bobbin-in place in an oscillating shuttle by a process as disclosed in'the U.S. Pat. No. 3,096,736, to R. E. Johnson July 9, I963 in'which at each needle reciprocation, a fresh loop of needle thread is seized and cast onto the bobbin.
  • bobbin thread replenishment results from the successively deposited thread loops rather than from a driven rotation of the bobbin.
  • bobbin thread is replenished on a bobbin in place in an oscillating loop taker by means of a ratchet drive for the bobbin by which the bobbin is rotated in increments during thread replenishment by a driver which oscillates with the loop taker driver.
  • the present invention is advantageous in that the replenishment thread may be directed through a bobbin thread tensioning spring and therefore, a greater uniformity of stitching can be obtained.
  • Another advantage of the construction of the present invention for replenishing bobbin thread in an oscillating loop taker sewing machine is that a more even winding of thread on the bobbin can be attained and consequently a greater quantityof thread can be replenished on the bobbin than an arrangement in which successive loops of thread are deposited.
  • FIG. 1 represents a vertical cross-sectional view of a portion of a sewing machine work supporting bed showing an oscillating lockstitch forming loop taker together with a fragment of the oscillating drive therefor in vertical cross section and having a bobbin thread replenishing mechanism applied thereto in accordance with this invention and shown in the retracted or sewing mode,
  • FIG. 2 represents an enlarged vertical cross-sectional view of the bobbin case of FIG. 1 with a fragment of the loop taker and a fragment of the bobbin rotating member shown in effective positionfor influencing the bobbin replenishing mode
  • FIG. 3 is an exploded perspective view of the loop taker, bobbin case bobbin, and of the parts associated therewith for winding replenishment thread on the bobbin,
  • FIG. 4 is a side elevational view of the bobbin case showing the needle thread being manually introduced thereto for initiation of bobbin thread replenishment
  • FIG. 5 is a front elevational view of the bobbin case together with an oscillating shuttle showing the needle thread manually introduced for initiation of bobbin thread replenishment as in FIG. 4,
  • FIG 6 represents a cross-sectional view of the bobbin case taken substantially along line 6-6 of FIG. 5 showing the relationship of the manually introduced needle thread to the bobbin flange upon initiation of bobbin thread replenishment, and
  • FIG. 7 represents a cross-sectional view taken substantially along line 7-7 of FIG. 4 showing the disposition of thread during the course of bobbin thread replenishment.
  • a work supporting bed of a sewing machine is indicated at 11 and is formed with a web 12 apertured at 13 to accommodate a bushing 14.
  • Journaled in the bushing is a loop taker drive shaft 15 which is formed with or has secured thereto a shuttle driver 16 at one side of the bushing 14.
  • a collar 17 secured by a setscrew 18 to the shaft 15 at the opposite side of the bushing locates the shaft axially in the machine bed.
  • a throat plate 2I Carried on the bed spanning a loop taker accommodating recess 20 therein is a throat plate 2I formed with a needle aperture 22 and with slots 23 through which extends a work transporting feed dog 24.
  • a shuttle housing 25 Beneath the throat plate and within the loop taker accommodating recess 20 is arranged a shuttle housing 25 which may be secured by any conventional means to the web 12 in the bed and which is formed with a bearing raceway 26 in which a shuttle 27 is journaled.
  • a housing cap 28 which may be hinged as at 29 to the shuttle housing is formed with a bearing projection 30 complemental to the bearing raceway 26 in order to constrain the shuttle within the housing.
  • a bearing rib 31 on the shuttle which is constrained between the raceway 26 and the bearing projection 30 is formed with a needle loop seizing beak 32 as is conventional and the shuttle is formed with a thread camming front skirt 33.
  • the shuttle driver 16 engages with and moves the shuttle 27 in an oscillatory fashion alternately over somewhat greater than one-half revolution increments in opposite directions as is well known in oscillatory shuttle lockstitch sewing machines.
  • the shuttle 27 is formed with a central post 35 upon which is accommodated a bobbin case 36.
  • a latch device 37 on the bobbin case may be moved into and out of gripping relation with an annular notch 38 formed on the extremity of the post 35 to maintain the bobbin case in the shuttle and a rotation restraining arm 39 on the bobbin case is embraced by a notch 40 formed in the shuttle housing cap 28 to prevent the bobbin case from oscillating with the shuttle.
  • the bobbin case 36 is formed with a central sleeve 41 which embraces the shuttle post 35 and on which sleeve a hub 42 ofa thread carrying bobbin 43 is freely rotatable.
  • the bobbin is formed with identical flanges 44.
  • the bobbin case is also formed with a peripheral skirt 45 which surrounds the bobbin 43.
  • the skirt is formed with a thread guiding slot 46 into which thread from the bobbin may be led when the bobbins are wound in conventional fashion while separated from the loop taker.
  • a thread tensioning spring 47 secured to the skirt 45 as by a screw 48 overlies the mouth of the thread guiding slot 46 and frictionally opposes passage of thread from the bobbin.
  • the needle thread N when placed and held as shown in FIGS. 4, 5, and 6, is in readiness to be wound on the bobbin. It is necessary that the thread guiding slot 60 be located so that in regular sewing operations the threads will not be directed into the slot 60.
  • the bobbin 43 in this invention is required to have two features which depart from conventional bobbin construction.
  • the slots 65 serve, when the thread is directed over the flange periphery, as shown in FIG. 6, to catch the thread loop and anchor the thread to the bobbin when the bobbin is rotated.
  • the second departure from conventional bobbin construction required by this invention is a series of evenly spaced radial notches 70 formed in the end face of each flange 44 of the bobbin.
  • the radial notches 70 it is the purpose of the radial notches 70 to provide for a ratchet drive for the bobbin in one direction of rotation and to prevent retrograde motion of the bobbin during bobbin thread replenishment.
  • a bobbin driving pawl 71 keyed and secured fast on a drive rod 72 by a screw 73.
  • the drive rod is endwise slidable in an axial bore 74 formed in the loop taker drive shaft and a radial pin 75 set into the drive rod 72 protrudes outwardly through a slot 76 formed lengthwise in the loop taker drive shaft.
  • the bobbin driving pawl 71 may be retracted into a cavity 77 formed in the shuttle driver 16 as shown in FIG. 1 or may be shifted out of'the cavity into engagement with the bobbin flange 44 as shown in FIG. 2 by means of a control lever 78 fulcrumed at 79 beneath the bed 11.
  • the control lever includes a handle 80 extending upwardly through an opening 81 in the bed for access by the machine operator.
  • the control lever also is formed with a bifurcated extremity 82 each branch of which carries an inwardly extending pin 83 embraced by the annular groove 84 in a collar 85 slidable on the loop taker drive shaft.
  • a coil spring 86 arranged in the loop taker shaft bore 74 bears against the drive rod 72 and biases the radial pin 75 towards the left as viewed in FIG. 1 against the collar 85.
  • the handle 80 By manipulation of the handle 80, therefore, the pawl 71 may be shifted selectively into or out of driving relationship with the bobbin.
  • annular spring member 90 is inserted in the bobbin case between the bobbin case and the bobbin.
  • the annular spring member 90 is provided with a pair of curved spring arms 91 and 92 which are bent laterally toward that side of the spring member 90 which faces the bobbin, i.e., toward the right as viewed in FIGS. 1, 2, and 3.
  • the spring" arms 91 and 92 differ not only as to their radial position but also in that the arm 91 is offset laterally to a greater degree.
  • the spring arm 92 which is offset the least is disposed opposite the ratchet notches 70 in the bobbin flange, the spring arm 91 is not in registry with the notches 70.
  • the spring member 90 is also formed with a peripheral tab 94 which is offset laterally in a direction opposite the spring arms 91 and 92 and which engages any one of a plurality of apertures 93 formed through the face of the bobbin case to prevent the spring 90 from turning.
  • the apertures 93 may be associated with the bobbin case latch 37 as is conventional in the type of bobbin case hereinbefore described or if a different type of latch device is employed, apertures or recesses 93 may be formed in the bobbin case face for anchoring the spring 90.
  • thread may be replenished on the bobbin 43 in place in the loop taker 27 when the operator of the sewing machine shifts the handle to the right as viewed in FIG. 1 to render effective the ratchet drive for the bobbin.
  • the operator need only grasp a loop of needle thread as it is being manipulated by the shuttle 27 and manually insert the needle thread into the slot 60 as described above. Subsequent operation of the sewing machine will thereafter cause the ratchet pawl 71 to drive the bobbin in increments in one direction of rotation. The needle thread being caught in one of the bobbin flange slots 65 and thus anchored to the bobbin, will be wound onto the bobbin hub 42.
  • the lead of the needle thread into the bobbin will immediately be drawn to the extremity 61 of the thread slot 60 in the bobbin case skirt which as shown in FIGS. 1 and 2 is spaced centrally of the bobbin flanges 44.
  • the resulting thread package wound on the bobbin will present an even distribution of thread on the hub 42 and the maximum length of thread may thus be wound on the bobbin.
  • the needle aperture 22 is located on the left-hand side of shuttle bearing rib 31 so that the needle path through the aperture 22 will occur to the left of the thread engaging beak 32 of the shuttle.
  • a lockstitch sewing machine having an endwise reciprocatory thread carrying needle, an oscillatory loop taker having a thread-carrying bobbin journaled therein, and an oscillating drive member for imparting movement to said loop taker for cooperation with said needle in the formation of lock stitches
  • mechanism for replenishing thread from said threadcarrying needle onto said bobbin in place in said loop taker comprising a bobbin driver carried for oscillation with said loop taker drive member, overrunning clutch means carried on said thread carrying bobbin and on said bobbin driver for drivingly coupling said bobbin with said bobbin driver in only one direction of oscillation of said bobbin driver, and means for selectively shifting said overrunning clutch means into and out of cooperative interrelation.
  • a bobbin thread replenishing mechanism for a sewing machine as set forthvin claim 2 in which said thread-carrying bobbin is journaled inl a bobbin case which bobbin case is restrained from partaking of the oscillatory movement of the loop taker, and in which a second ratchet and pawl means is provided on said bobbin and said bobbin case for preventing retrograde movement of said bobbin during the other direction of oscillation of said bobbin driver.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US11999A 1970-02-17 1970-02-17 Bobbin thread replenishing mechanisms for sewing machine with oscillating shuttle Expired - Lifetime US3587493A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1199970A 1970-02-17 1970-02-17

Publications (1)

Publication Number Publication Date
US3587493A true US3587493A (en) 1971-06-28

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ID=21752904

Family Applications (1)

Application Number Title Priority Date Filing Date
US11999A Expired - Lifetime US3587493A (en) 1970-02-17 1970-02-17 Bobbin thread replenishing mechanisms for sewing machine with oscillating shuttle

Country Status (6)

Country Link
US (1) US3587493A (2)
JP (1) JPS4946870B1 (2)
BR (1) BR7100851D0 (2)
CH (1) CH526668A (2)
FR (1) FR2078518A5 (2)
GB (1) GB1317126A (2)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769343A (en) * 1995-05-25 1998-06-23 Juki Corporation Apparatus for supplying the bobbin thread of the sewing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5769343A (en) * 1995-05-25 1998-06-23 Juki Corporation Apparatus for supplying the bobbin thread of the sewing machine
DE19621430B4 (de) * 1995-05-25 2006-07-20 Juki Corp., Chofu Vorrichtung zum Aufwickeln eines Unterfadens

Also Published As

Publication number Publication date
CH526668A (de) 1972-08-15
BR7100851D0 (pt) 1973-02-22
DE2105670B2 (de) 1975-10-23
DE2105670A1 (de) 1971-10-14
GB1317126A (en) 1973-05-16
JPS4946870B1 (2) 1974-12-12
FR2078518A5 (2) 1971-11-05

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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