US3164113A - Bobbin thread pull-off for sewing machines - Google Patents

Bobbin thread pull-off for sewing machines Download PDF

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Publication number
US3164113A
US3164113A US280281A US28028163A US3164113A US 3164113 A US3164113 A US 3164113A US 280281 A US280281 A US 280281A US 28028163 A US28028163 A US 28028163A US 3164113 A US3164113 A US 3164113A
Authority
US
United States
Prior art keywords
thread
feed
pull
bobbin
feed bar
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
US280281A
Other languages
English (en)
Inventor
Stanley J Ketterer
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 US280281A priority Critical patent/US3164113A/en
Priority to DE19641485335 priority patent/DE1485335A1/de
Priority to GB19502/64A priority patent/GB1006150A/en
Priority to CH633364A priority patent/CH432207A/de
Application granted granted Critical
Publication of US3164113A publication Critical patent/US3164113A/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
    • 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
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B63/00—Devices associated with the loop-taker thread, e.g. for tensioning

Definitions

  • This invention relates to improvements in sewing machines employing a rotary loop taker complemental to a reciprocatory thread carrying needle in the formation of lock-stitches, the invention being particularly related to mechanism for metering under or locking thread from a thread carrying bobbin in the sewing machine loop taker during the formation of lock stitches.
  • Another object of this invention is to provide a bobbin thread pull-olf device which is compact and may be accommodated in the limited space available adjacent to the stitch forming instrumentalities of a sewing machine of the type employing a Vertical axis loop taker.
  • FIG. l is a vertical cross sectional view of a sewing machine having this invention applied thereto,
  • FIG. 2 is an enlarged vertical cross sectional view of a portion of the sewing machine bed taken substantially along line 2 ⁇ *2 of FIG. l, including a representation of the needle and bobbin threads, with the parts illustrated at the setting of a stitch,
  • FIG. 3 is a vertical cross sectional view similar to FIG. 2 with the parts illustrated as the needle begins to descend after the preceding stitch has been set, and illustrating the pull-olf member drawing thread from the bobbin,
  • FIG. 4 is an enlarged top plan view of a portion of the sewing and work feeding mechanism in the bed of the sewing machine of FIG. l, and
  • FIG. 5 is a perspective view of the bobbin thread pulloif member of this invention.
  • the sewing machine to which this invention is applied includes a frame having a bed 11 formed with a work supporting surface 12, a standard 13 rising from the bed, and a bracket arm 14 extending from the standard and terminating in a sewing head 15.
  • a thread carrying needle 16 which is endwise reciprocable in the sewing head, cooperates in the formation of lock stitches with a loop taker 17 journaled for rotation about a vertical axis in a bearing 18 in the bed.
  • the needle is drivingly connected to a main shaft 19 journaled in the bracket arm so as to be reciprocated once for each rotation of the main shaft.
  • a needle thread take up 27 driven by the main shaft 19 for manipulating the needle thread during sewing, as well as a spring loaded presser foot 28 which is biased downwardly against a throat plate 29 set into the work supporting surface 12 of the bed.
  • the throat plate is formed with an aperture 36 to accommodate the endwise reciprocating needle and with slots 31 through which a feed dog 32 works in opposition to the presser foot 28 to transport work fabrics in stitching.
  • the work feeding mechanism is of the type referred to in the art as a four motion drop feed mechanism in that the feed dog is lifted and lowered into engagement with fabrics beneath the presser foot and advanced and returned along the line of feed, the feed dog being dropped beneath the upper level of the throat plate during the return motion.
  • the feed dog is secured to a feed bar 33 which is pivoted on a stud 34 extending between upstanding rock arm 35 of a feed advance rock shaft 36 journaled in the bed.
  • a rock arm 37 extending from the feed advance rock shaft is pivoted to a bifurcated pitman 38 in the standard which embraces a feed advance cam 39 fast on the main shaft 19.
  • a Stitch length adjusting lever arm 40 extends from a slotted guide member 41 fulcrumed in the standard and embracing a slide block 42 pivoted on the pitman 3S.
  • the feed bar beneath the feed dog is formed with a depending limb 43 to the lower extremity of which is pivoted a link 44 which depends from a rock arm 45 extending substantially horizontally from a feed lift rock shaft 46 journaled in the bed.
  • a rock arm 47 on the feed lift rock shaft 46 is pivoted to a pitman 48 in the standard which embraces a feed lift eccentric 49 fast on the main shaft 19.
  • the loop taker 17 includes a cup shaped body portion 60 having a peripheral bearing rib 61 and with a loop seizing beak 62 formed thereon.
  • a bobbin case 63 is formed with a bearing raceway 64 and is sustained with the raceway embracing the loop taker bearing rib 61 by means of a retractable keeper 65 on the bed having a spring 66 which occupies a position opposite an abutment surface 67 on the bobbin case.
  • the keeper 65 also serves to restrain the bobbin case from rotation with the loop taker. Counter rotation of the bobbin case is prevented by a rotation restraining finger 68 on the bed which engages on abutment projection 69 on the bobbin case.
  • the bobbin case 63 is formed with an annular seat 70 which accommodates the upper llange 71 of a thread carrying bobbin 72.
  • a spherical depression 73 which accommodates a spherical projection 74 formed on a bobbin hold-down arm 75 pivoted on the bobbin case and biased downwardly by a spring 76 to apply a normal force between the bobbin flange 71 and the bobbin case seat 70 frictionally to resist turning of the bobbin thereby to provide a tension on the bobbin thread during sewing when the stitches are being set.
  • the bobbin case adjacent to the path of needle reciprocation is formed with van inclined bobbin thread accommodating slot 77 through which thread may be directed onto the bobbin.
  • the slot is spanned internally of the bobbin case by a cross piece 7 S.
  • the path of the bobbin thread from the bobbin to the work passes beneath the cross piece 7S and over an inclined surface 79 on the bobbin case 63 adjacent to the slot 77.
  • the bobbin thread pull-olf member 96 of this invention is illustrated in place in the sewing machine in FIGS. 2, 3
  • the pull-olf member 9% preferably comprises an integral sheet metal stamping including a flat horizontal portion 9i adapted to overlie the feed bar and formed with elongate .off member slidably in place. vl5 ⁇ orwardly of the feed bar the pull-off member is formed with an aperture 94 to accommodate endwise reciprocation of the needle and through which aperture the bobbin thread is directed as it passes from the bobbin case to the thro-at plate needle aperture 3i).
  • the rib 95 at the forward extremity of the pull-off member and across the apenture 9d thereof thus overlies the bobbin thread which extends from the bobbin to the work being stitched as illustrated in FIGS.
  • the flat horizontal portion 91 of the pull-off member is joined by a vertical portion including a downwardly extending limb 96 and a rearwardly extending limb 97 which is bifurcated as at g3 and slidably embraces the stud 34 by which the feed bar is pivotally connected to the rock arm 36 of the feed advance rock shaft.
  • the pull-off member 90 is thus constrained at both the front and rear for movement vertically with the feed bar 33 4but is mounted by the guide slot 92 and bifurcation g8 for freedom to slide relatively to the feed bar in the direction of the advance and return feed motions.
  • the pull-off member 9i) is imparted motion in the direction of the yadvance and return feed motion independently of the feed bar motion in this direction by means of a drive link Q9 pivotally -connected by a shouldered clamp screwlliid which may be adjustably secured in an elongate slot lill formed in the lower extremity of the downwardly extending limb 96 of the pull-olf member.
  • the drive link 9i) is pivottally connected to a rock arm 1&2 depending from the feed lift rock shaft 46.
  • the drive link 99 is preferably arranged inclined forwardly and downwardly from the pull-oft ⁇ lmember limb 96 to the rock arm 102 as illustrated in FIG. 2.
  • the motions imparted to the pull-off member 9@ will similarly be of substantially constant amplitude and this includes not only those components of the pull-off motion which are irnparted because the pull-ohc member shares the feed lift f motion of the feed bar, butvals'o thosey components of the pull-off motion in theV direction of the feed advance and return motion which are imparted by the drive link 99 from the feed ylift rock shaft.
  • FIGS. 2 and 3 indicate the preferred timing of the Vmotion of the pull-ofi member 9i) and illustrate the manner in which the pull-off member serves to meter bobbin thread to the seam.
  • FlG. 2 indicates the position of parts at the completion of a stitch and at the completion of a feed advance stroke of the feed bar.
  • the combined action of the setting of Y the previous stitch by the needle thread take up 27 and the transport of the work fabric to the left by the feed dog will have drawn the bobbin thread taut.
  • the pull-ntf member will be lowered with the feed bar and by virtue of the rock arm im and link 99 Will also be shifted to the left relatively to the feed bar into the position illustrated in FIG.
  • the pulloif device of this invention is particularly advantageous in its cooperation with a loop taker in which frictional resistance to turning of the bobbin is used to deveiop the bobbin thread tension. Since the thread is drawn from the bobbin in periodic increments during stitching, the tension which is applied by the turning of the bobbin varies during the withdrawal of each increment, initially rising to a peak as the bobbin is accelerated and then tapering off as the remainder of each increment is drawn from the bobbin.
  • the pull-od device of .this invention is preferably' adjusted to draw from the bobbin slightly less than lan amount of bobbin thread necessary to form a short stitch.
  • a lockstitch sewing machine having stitch forming instrumentalities including a thread carrying needle, a loop taker carrying a supply of under thread and cooperating with said needle in the formation of lock stitches, and a drop feed mechanism including a feed bar, means for imparting advance and return movements to said feed bar and means for imparting rising and falling movements to said feed bar, and under thread pull-oil mechanism comprising a thread pull-off member, under thread engaging means on said thread pull-off member, means supporting said thread puh-off member on said feed bar for rising and falling movement therewith and for movement relatively thereto in the direction of said feed bar advance and return movements. and mechanism operating in timed relation with said stitch forming instrumentalities for shifting said thread pull-off member relatively to said feed bar.
  • a lockstitch sewing machine having stitch forming instrumentalities including a thread carrying needle, a loop taker carrying ⁇ a lsupply of under thread vand cooperating with said needle in the lformation of lock stitches, and a drop feed mechanism inciuding a lfeed bar, means for imparting advance and return movements to said feed bar and means for imparting rising .and lfalling movements to .said ,feed bar, an under thread pull-off mechanism comprising ⁇ a thread pull-off member, under thread engaging means on ⁇ said thread puli-off member, means supporting said thread pull-off member on said feed lbar for rising and falling movement therewith and for movement relatively thereto in vthe direction of said lfeed bar 'advance and return movements, and a linkage operatively connecting said thread .pull-oit member with said means for imparting rising and falling movements to said feed bar for shifting said thread pull-off mem-ber relatively to said feed bar.
  • a lockstitch sewing machine having sitch forming linstrmnentalities including a thread carrying needle, a loop taker carrying a supply of under thread Iand cooperating with said needle in the formation of lock stitches, and a drop feed mechanism including a feed dog extending between said needle and said loop taker, means for imparting advance and return movements to ⁇ said feed dog, means for :imparting rising and Ifalling movements ato feed dog, an under thread pull-off mechanism comprising a thread 4pull-off member, under thread engaging means on said thread pull-off member, means supporting said thread pull-off member for movement relatively to said feed dog in the direction of advance and return motion of said feed dog and with said under thread engaging means on said thread pull-off member disposed ⁇ biet-Ween said 'feed dog and said loop taker, and mechanism operated by said means for imparting rising ⁇ and falling movements to said feed dog for shifting said Thread pull-off member -relatively to said feed dog.
  • a lockstitch sewing machine having stitch forming instrumentalities including a thread carrying needle, a loop taker carrying a supply ⁇ of under thread and cooperating with said needle in Ithe formation of lock stitches, and a drop -feed mechanism including a feed bar supported for movement in a substantially vertical plane, means for -irnparting -advance and return movements to said -feed bar and means for imparting rising and falling movements to said feed bar, an under thread pull-off mechanism comprising a thread pull-off member, under thread engaging means on said thread pull-off member, means supporting said thread pull-off member on said feed bai for rising and falling movement therewith and for movement relatively thereto in the direction of said feed bar advance and return movements, an ⁇ oscillating drive element for said thread pull-off member .supported in said sewing machine for oscillation lin a plane parallel'to the vertical plane of movement of the feed fbar and driven in timed relation with said stitch Iforming instrumentalities, and a connecting link .pivoted to said oscillating drive
  • a lockstitch sewing machine having stitch forming instrumentalities including a thread carrying needle, a loop taker carrying a supply of under thread and cooperating with said needle in the formation of lock stitches, and a drop feed mechanism includ-ing a feed bar supported for movement in a substantially vertical plane, means for imparting advance and return movements to said feed bar, a feed lift rock shaft journaled in said sewing machine, a feed lift rock arm fast on said rock shaft and operatively connected to said feed bar to impart rising and falling movements thereto, an -under thread pull-off mechanism comprising a thread pull-off member, under thread engaging means on said thread pull-off member, means supporting said thread pull-off mem-'ber on said feed bar for rising and falling movement therewith and for movement ⁇ relatively thereto in the direction Iof said feed bar advance :and return movements, a thread pull-olf actuating rock arm fast on said feed lift rock shaft, and a connecting link pivoted to said thread pull-off actuating rock arm and to said thread pull-o
  • a lockstitch sewing machine having stitch forming instrumentalities including a thread carrying needle, a loop taker carrying a supply of under thread and cooperating with said needle in lthe formation of lock stitches, and a drop feed mechanism including a feed ibar sup-ported for movement in a substantially vertical plane, means for mparting advance and return movements to said feed bar, and under thread pull-off mechanism comprising .a thread pull-off member, underV thread engaging means on said thread pull-off member, means ⁇ supporting said thread pulloff member on said feed bar for rising and falling movement therewith and for movement relatively thereto in the direction of said feed bar advance and return movements, a feed lift rock ⁇ arm fast on said feed lift rock shaft, an

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US280281A 1963-05-14 1963-05-14 Bobbin thread pull-off for sewing machines Expired - Lifetime US3164113A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US280281A US3164113A (en) 1963-05-14 1963-05-14 Bobbin thread pull-off for sewing machines
DE19641485335 DE1485335A1 (de) 1963-05-14 1964-05-06 Spulenfadenabzugseinrichtung fuer Naehmaschinen
GB19502/64A GB1006150A (en) 1963-05-14 1964-05-11 Bobbin thread pull-off for sewing machines
CH633364A CH432207A (de) 1963-05-14 1964-05-14 Doppelsteppstich-Nähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US280281A US3164113A (en) 1963-05-14 1963-05-14 Bobbin thread pull-off for sewing machines

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US3164113A true US3164113A (en) 1965-01-05

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US280281A Expired - Lifetime US3164113A (en) 1963-05-14 1963-05-14 Bobbin thread pull-off for sewing machines

Country Status (4)

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US (1) US3164113A (de)
CH (1) CH432207A (de)
DE (1) DE1485335A1 (de)
GB (1) GB1006150A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467039A (en) * 1967-11-20 1969-09-16 Singer Co Work feeding mechanisms for sewing machines
US4182250A (en) * 1979-02-02 1980-01-08 The Singer Company Bobbin thread control means for a lock stitch sewing machine
US4215639A (en) * 1979-02-02 1980-08-05 The Singer Company Selectively controllable bobbin thread pull-off mechanism
US4380961A (en) * 1981-03-23 1983-04-26 The Singer Company Variably controllable bobbin thread pull-off mechanism
US4399761A (en) * 1981-07-13 1983-08-23 The Singer Company Resilient bobbin thread pull-off member for lockstitch sewing machine
US5048438A (en) * 1988-11-29 1991-09-17 Mefina S.A. Sewing machine bobbin thread tension control device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US723330A (en) * 1899-10-02 1903-03-24 Wheeler & Wilson Mfg Co Bobbin-controlling mechanism for sewing-machines.
US875613A (en) * 1903-04-27 1907-12-31 William N Parkes Bobbin-controlling mechanism for sewing-machines.
US927993A (en) * 1896-11-24 1909-07-13 Standard Sewing Machine Co Bobbin-thread controller for sewing-machines.
US1792237A (en) * 1929-01-15 1931-02-10 Singer Mfg Co Bobbin-thrfad pull-off for lock-stitch machines
US2555658A (en) * 1949-01-29 1951-06-05 Singer Mfg Co Bobbin rotation restraining means for sewing machines
US2888892A (en) * 1955-11-10 1959-06-02 United Shoe Machinery Corp Sewing machines
US2966130A (en) * 1954-11-29 1960-12-27 Singer Mfg Co Sewing machine and loop-taker mechanisms therefor

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US927993A (en) * 1896-11-24 1909-07-13 Standard Sewing Machine Co Bobbin-thread controller for sewing-machines.
US723330A (en) * 1899-10-02 1903-03-24 Wheeler & Wilson Mfg Co Bobbin-controlling mechanism for sewing-machines.
US875613A (en) * 1903-04-27 1907-12-31 William N Parkes Bobbin-controlling mechanism for sewing-machines.
US1792237A (en) * 1929-01-15 1931-02-10 Singer Mfg Co Bobbin-thrfad pull-off for lock-stitch machines
US2555658A (en) * 1949-01-29 1951-06-05 Singer Mfg Co Bobbin rotation restraining means for sewing machines
US2966130A (en) * 1954-11-29 1960-12-27 Singer Mfg Co Sewing machine and loop-taker mechanisms therefor
US2888892A (en) * 1955-11-10 1959-06-02 United Shoe Machinery Corp Sewing machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467039A (en) * 1967-11-20 1969-09-16 Singer Co Work feeding mechanisms for sewing machines
US4182250A (en) * 1979-02-02 1980-01-08 The Singer Company Bobbin thread control means for a lock stitch sewing machine
US4215639A (en) * 1979-02-02 1980-08-05 The Singer Company Selectively controllable bobbin thread pull-off mechanism
US4380961A (en) * 1981-03-23 1983-04-26 The Singer Company Variably controllable bobbin thread pull-off mechanism
US4399761A (en) * 1981-07-13 1983-08-23 The Singer Company Resilient bobbin thread pull-off member for lockstitch sewing machine
US5048438A (en) * 1988-11-29 1991-09-17 Mefina S.A. Sewing machine bobbin thread tension control device

Also Published As

Publication number Publication date
DE1485335A1 (de) 1969-05-14
CH432207A (de) 1967-03-15
GB1006150A (en) 1965-09-29

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