US3320912A - Convertible work-feeding devices for sewing machines - Google Patents

Convertible work-feeding devices for sewing machines Download PDF

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Publication number
US3320912A
US3320912A US433680A US43368065A US3320912A US 3320912 A US3320912 A US 3320912A US 433680 A US433680 A US 433680A US 43368065 A US43368065 A US 43368065A US 3320912 A US3320912 A US 3320912A
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United States
Prior art keywords
work
teeth
feed
sewing
convertible
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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
Application number
US433680A
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English (en)
Inventor
Stanley J Ketterer
Manfred R Laidig
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 US433680A priority Critical patent/US3320912A/en
Priority to GB5393/66A priority patent/GB1063500A/en
Priority to FR49790A priority patent/FR1468321A/fr
Priority to CH230966A priority patent/CH446868A/de
Application granted granted Critical
Publication of US3320912A publication Critical patent/US3320912A/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
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements

Definitions

  • This invention relates to work-feeding devices for sewing machines and more particularly to a convertible workfeeding device for a sewing machine which is capable of both straight-stitch and zigzag-stitch sewing.
  • zigzaz sewing machines it is highly desirable to include a provision for straight-stitch sewing in order to enchance the versatility of the machines.
  • straightstitch sewing may constitute the sewing operation most frequently performed.
  • a feed dog which has at least two rows of teeth to grip the work on each side of the seam.
  • the optimum lateral distance between the rows of teeth is different for straight-stitch sewing and for zigzag-stitch sewing.
  • Another object of the invention is to provide a convertible work-feeding device for a sewing machine, the work-feeding device being convertible to approach 0ptimum work-feeding conditions in both straight-stitch and zigzag-stitch sewing.
  • the main feature of the invention is the provision of means to adjust the lateral spacing between seam-straddling rows of teeth in a work-feeding device for a sewing machine.
  • the teeth are placed in sufficient open position to furnish clearance for the zigzag needle penetrations while in straight-stitch sewing, the teeth are placed in close position for uniform and wrinkle-free work feeding.
  • the means for adjusting the lateral distance between the teeth include an elongated auxiliary feed bar carrying one of the rows of teeth which in effect constitute an auxiliary feed dog, while the other teeth constitute a main feed dog.
  • An auxiliary feed bar is pivotally mounted on a concentric portion of an eccentric stud rotation of which permits adjustment of the height of the teeth of the auxiliary feed dog relatively to the height of the teeth of the main feed dog.
  • the length of the elongated auxiliary feed bar between the pivot stud and the top of the auxiliary feed dog and the small lateral displacement involved makes the slight tilt of the auxiliary feed dog minimal when in either open or close position.
  • FIG. 1 is a top plan view of a work-supporting bed of a sewing machine incorporating a work-feeding device of the invention with the teeth in open position for zigzagstitch sewing;
  • FIG. 2 is a cross sectional view of the work-supporting bed of FIG. 1 taken normal to the line of Work feed;
  • FIG. 3 is a cross sectional view of the work-supporting bed taken parallel to the line of work feed;
  • FIG. 4 is a top view of the work-supporting bed of FIG. 1 with the teeth of the work-feeding device in close position for straight-stitch sewing;
  • FIG. 5 is a cross sectional view of the work-supporting bed as shown in FIG. 4, taken normal to the line of work feed;
  • FIG. 6 is an exploded perspective view of the workfeeding device of the invention.
  • the work-feeding device of the invention is illustrated as incorporated in a conventional sewing machine having a frame which includes a work-supporting bed 10 and a sewing head 11.
  • a frame which includes a work-supporting bed 10 and a sewing head 11.
  • Mounted in the sewing head is an endwise-reciprocating needle bar 12 to which is clamped by means of a clamping screw 13 a thread-carrying needle 14.
  • the thread-carrying needle is adapted to cooperate with a complementary stitch-forming mechanism represented by a loop taker 15 mounted inside the work-supporting bed.
  • a presser bar 16 the relevance of which will be explained later.
  • the workfeeding mechanism includes a feed-advance rock shaft 17 mounted between two pintles 18 of which only one is shown. Pivotally supported between a pair of rock arms 19 upstanding from the feed-advance rock shaft 17 is a feed bar 20 to which the rock arms impart feed advance and return motion in response to oscillation of the rock shaft 17.
  • the feed bar 20 has a depending portion 21 at its distal end and by means of screws 22 mounts two rows of feed teeth 23 and 24 which in effect constitute a main feed dog 25. Therefore, hereinafter, the feed bar 20 will be referred to as the main feed bar.
  • auxiliary feed bar mounting means or bracket 26 which may be connected to the depending portion 21 as by brazing 27.
  • auxiliary feed bar mounting bracket 26 To the auxiliary feed bar mounting bracket 26, there is pivotally connected an elongated auxiliary feed bar 28.
  • the pivotal means for mounting the auxiliary feed bar 28 includes a pivot stud 29 which has a concentric portion 30.
  • a setscrew 31 in the bracket 26 and bearing against an eccentric portion 32 of the pivot stud 29 maintains the eccentric portion 32 of the stud against rotation and in a preset orientation whereby to provide for adjustment of the height of the auxiliary feed bar 28.
  • a stop means or bracket 35 secured to the front of the depending portion 21 of the main feed bar 20 by means of screws 36 limits the extent of swinging lateral movement of the auxiiliary feed dog 34.
  • a feed-1ift connecting lever 39 Pivotally connected to the depending portion 21 of the main feed bar 20 by means of a pivot screw 38 is a feed-1ift connecting lever 39 which serves to impart feed-lift motion to the main feed bar 20 in synchronism with the feed advance and return motion imparted by the feedadvance rock shaft 17. Since the convertible work-feeding device of this invention may be used with any conventional driving means for the feed-advance and feed-lift mechanism, only the feed-advance rock shaft 17 and the feed-lift connecting lever 39 are disclosed. herein.
  • the teeth 23, 24 and 33 of the feed dogs 25 and 34 are placed in open position as shown in FIGS. 1 and 2 to provide clearance for the zigzag movements of the reciprocating needle 14 which penetrates between the endmost rows of feed teeth 23 and 33.
  • the teeth of the feed dogs rise above correspondingly positioned slots 40 in a throat plate 41 to cooperate with a soleplate 42 of a presser device or foot 43 to feed work to be sewn which is placed on the work-supporting bed 10.
  • the throat plate 41 is removably mounted on the worksupporting bed by means of two downwardly springbiased posts 44, while the presser foot 43 is removably clamped to the presser bar 16' by means of a clamping screw 45.
  • Both the throat plate 41 and the presser foot 43 contain laterally elongated needle-clearance slots or apertures 46 and 47 respectively, to accommodate the lateral penetrations of the needle.
  • the throat plate 41 is removed from the work-supporting bed 10 and, as shown in FIGS. 4 and 5, the teeth 23, 24,
  • a second throat plate 48 having slots 49 corresponding to the teeth of the feed dogs in close position is substituted for the throat plate 41 because the slots 40 of the throat plate 41 no longer line up with the teeth of the feed dogs.
  • the presser foot 43 may be replaced in favor of a presser foot t) having a narrower sole-plate 51 corresponding to the teeth of the feed dogs in close position.
  • the stop bracket 35 limits the maximum open and minimum close positions of the auxiliary feed dog 34. However, it is the slots 40 or 4-9 in the throat plate 41 or 48 which maintain the feed teeth 23, 24 and 33 in open or close position depending on which throat plate 41 or 48 is secured to the work-supporting bed of the sewing machine. Since the feed-lift movement imparted to the feed bar by the conventional feed-lift mechanism is such that the teeth of the feed dogs and 34 never drop below the bottom 52 or 53 of the throat plate, the throat plate slots or 49 will act as guides for the rows of feed dog teeth to maintain the selected spacing therebetween.
  • the eccentric portion 32 of the pivot stud 38 permits adjustment of the height of the teeth of the auxiliary feed dog relative to the height of the teeth of the main feed dog while the length of the elongated auxiliary feed bar 28 from the pivot stud 29 to the top of the auxiliary feed dog 34 and the slight lateral displacement involved maintains the top of the teeth 33 of the auxiliary fed dog 34 substantially in a plane coincident with a plane determined by the top of the teeth 23 and 24 of the main feed dog 25 whether the auxiliary feed dog 34 is in open position for zigzag-stitch sew-ing or in close position for straight-stitch sewing.
  • a convertible work-feeding device for a sewing machine having a frame including a work-supporting bed and a sewing head, a thread-carrying needle mounted in the sewing head for endwise reciprocation wit-h respect to the work-supporting bed, stitchforming mechanism complemental to said thread-carrying needle mounted in the work-supporting bed, and a work-feeding actuating mechanism mounted on said frame and connected to said convertible work-feeding device, said convertible work-feeding device comprising a pair of workgripping means having work-gripping surfaces located substantially laterally opposite and substantially parallel to each other, and means for adjusting the lateral distance between the work-gripping surfaces of said workgripping means.
  • a convertible work-feeding device for a sewing machine having a frame including a work-supporting bed and a sewing head, a thread-carrying needle mounted in the sewing head for endwise reciprocation with respect to the work-supporting bed, stitch-forming mechanism complemental to said thread-carrying needle mounted in the work-supporting bed, and a work-feeding actuating mechanism for said convertible work-feeding device mounted in the work-supporting bed
  • said convertible work-feeding device comprising a main feed bar connected to the workfeeding mechanism in the work-supporting bed, a main fed dog having at least one row of teeth and mounted on the main feed bar, an auxiliary feed bar operatively connected to the work-feeding mechanism, an auxiliary feed dog having at least one row of teeth and mounted on the auxiliary feed bar with the teeth disposed substantially laterally opposite and substantially parallel to the teeth of the main feed dog, and means for adjusting the lateral distance between the rows of teeth of the feed dogs.
  • a convertible work-feeding device for a sewing machine which is capable of both straight-stitch and zigzagstitch sewing and has a frame including a work-supporting bed and a sewing head, a thread-carrying needle mounted in the sewing head for endwise reciprocation with respect to the work-supporting bed, stitch-forming mechanism complemental to said thread-carrying needle mounted in the work-supporting bed, and a work-feeding mechanism mounted in the work-supporting bed
  • said convertible work-feeding device comprising a main feed bar connected to the work-feeding mechanism in the work-supporting bed, a main feed dog having at least one row of teeth and mounted on the main feed bar, an auxiliary feed bar operatively connected to the workfeeding mechanism, an auxiliary feed dog having at least one row of teeth and mounted on the auxiliary feed bar with the teeth disposed substantially laterally opposite and substantially parallel to the teeth of the main feed dog, and means for adjusting the lateral distance between the rows of teeth of the feed dogs from close position for straight-stitch sewing
  • a convertible work-feeding device for a sewing machine having a frame including a sewing head and a work-supporting bed which has means for mounting removable throat plates, a thread-carrying needle mounted in the sewing head for endwise reciprocation with respect to the work-supporting bed, stitch-forming mechanism complemental to said thread-carrying needle mounted in the work-supporting bed, and a work-feeding mechanism mounted in the work-supporting bed to which said convertible work-feeding device is connected
  • said convertible work-feeding device comprising a main feed bar connected to the work-feeding mechanism in the work-supporting bed, a main feed dog having at least one row of teeth and mounted on the main feed bar, an auxiliary feed bar operatively connected to the work-feeding mechanism, an auxiliary feed dog having at least one row of teeth and mounted on the auxiliary feed bar with the teeth disposed substantially opposite and substantially parallel to the teeth of the main feed dog, means for selectively adjusting the lateral distance between the rows of teeth on the feed dogs, and at least two throat plates adapted to be
  • a convertible work feeding device for a sewing ma chine which is capable of both straight-stitch and zigzagstitch sewing and has a frame including a work-supporting bed and a sewing head, a thread-carrying needle mounted in the sewing head for endwise reciprocation with respect to the work-supporting bed, stitch-forming mechanism complemental to said thread-carrying needle and mounted in the work-supporting bed in opposition to the threadcarrying needle, and a four-motion drop feed work-feeding mechanism mounted in the work-supporting bed, said convertible work-feeding device comprising a main feed bar connected to the four-motion drop feed work-feeding mechanism in the work-supporting bed, a main feed dog having at least one row of teeth and mounted on the main feed bar, an auxiliary feed bar operatively connected to the four-motion drop feed work-feeding mechanism, an auxiliary feed dog having at least one row of teeth and mounted on the auxiliary feed bar with the teeth disposed substantially laterally opposite and substantially parallel to the teeth of the main feed dog, and means
  • a convertible work-feeding device for a sewing ma chine which is capable of both straight-stitch and zigzagstitch sewing and has a frame including a work-supporting bed and a sewing head, a thread-carrying needle mounted in the sewing head for endwise reciprocation with respect to the work-supporting bed, stitch-forming mechanism complemental to said thread-carrying needle mounted in the work-supporting bed, and a work-feeding mechanism mounted in the work-supporting bed
  • said convertible Work-feeding device comprising a main feed bar connected to the work-feeding mechanism in the work-supporting bed and having a depending portion at the distal end, a main feed dog having at least one row of teeth and mounted on the main feed bar, an auxiliary feed bar mounting means at the bottom of the depending portion of the main feed bar, an elongated auxiliary feed bar pivotally connected to the auxiliary feed bar mounting means by pivotal means so that the remote distal end can move laterally relative to the teeth of the main feed dog, and an auxiliary feed dog
  • the convertible work-feeding device of claim 6 which includes stop means for limiting the minimum close posi tion and the maximum open position of said feed dogs.
  • the convertible work-feeding device of claim 6 which includes a pair of throat plates adapted to be selectively and removably secured to said work-supporting bed, one of said throat plates having feed dog slots corresponding to said rows of teeth of said feed dogs in close position for straight-stitch sewing and the other of said throat plates having feed dog slots corresponding to said rows of teeth of said feed dogs in open position for zigzagstitch sewing and a laterally elongated needle aperture to provide clearance for needle penetrations in zigzag-stitch sewing.
  • the convertible work-feeding device of claim 9 which includes a pair of presser devices adapted to be selectively and removably secured to a presser bar mounted in said sewing head in opposition to a selected one of said throat plates, one of said presser devices adapted for straight-stitch sewing and having a narrow sole-plate to oppose said rows of teeth of said feed dogs in close position and the other of said presser devices adapted for zigzag-stitch sewing and having a wider sole-plate to oppose said rows of teeth of said feed dogs in open position and a laterally elongated needle slot to provide clearance for needle penetrations in zigzag-stitch sewing.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US433680A 1965-02-18 1965-02-18 Convertible work-feeding devices for sewing machines Expired - Lifetime US3320912A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US433680A US3320912A (en) 1965-02-18 1965-02-18 Convertible work-feeding devices for sewing machines
GB5393/66A GB1063500A (en) 1965-02-18 1966-02-08 Convertible work-feeding device for sewing machines
FR49790A FR1468321A (fr) 1965-02-18 1966-02-16 Dispositif transformable d'entraînement de l'ouvrage pour machine à coudre
CH230966A CH446868A (de) 1965-02-18 1966-02-17 Umwandelbare Arbeitsstück-Vorschubvorrichtung für Nähmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US433680A US3320912A (en) 1965-02-18 1965-02-18 Convertible work-feeding devices for sewing machines

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US3320912A true US3320912A (en) 1967-05-23

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US (1) US3320912A (de)
CH (1) CH446868A (de)
GB (1) GB1063500A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159003A (en) * 1978-04-10 1979-06-26 The Singer Company Convertible work feeding device for sewing machines
EP2138619A1 (de) * 2008-06-24 2009-12-30 Dürkopp Adler AG Transporteur zum Transport von Nähgut während des Betriebs einer Nähmaschine
CN102995303A (zh) * 2011-09-09 2013-03-27 曾贤长 送布机构的导引结构
US20180080156A1 (en) * 2016-09-16 2018-03-22 Janome Sewing Machine Co., Ltd. Sewing machine
CN111926471A (zh) * 2019-05-13 2020-11-13 Juki株式会社 针进给缝纫机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1139051A (en) * 1908-05-25 1915-05-11 Union Special Machine Co Feeding mechanism for multiple-needle machines.
US3025812A (en) * 1957-03-20 1962-03-20 Anker Phoenix Nahmaschinen Ag Sewing machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1139051A (en) * 1908-05-25 1915-05-11 Union Special Machine Co Feeding mechanism for multiple-needle machines.
US3025812A (en) * 1957-03-20 1962-03-20 Anker Phoenix Nahmaschinen Ag Sewing machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4159003A (en) * 1978-04-10 1979-06-26 The Singer Company Convertible work feeding device for sewing machines
EP2138619A1 (de) * 2008-06-24 2009-12-30 Dürkopp Adler AG Transporteur zum Transport von Nähgut während des Betriebs einer Nähmaschine
CN102995303A (zh) * 2011-09-09 2013-03-27 曾贤长 送布机构的导引结构
CN102995303B (zh) * 2011-09-09 2015-04-01 曾贤长 送布机构的导引结构
US20180080156A1 (en) * 2016-09-16 2018-03-22 Janome Sewing Machine Co., Ltd. Sewing machine
US10202716B2 (en) * 2016-09-16 2019-02-12 Janome Sewing Machine Co., Ltd. Sewing machine
CN111926471A (zh) * 2019-05-13 2020-11-13 Juki株式会社 针进给缝纫机
CN111926471B (zh) * 2019-05-13 2023-09-05 Juki株式会社 针进给缝纫机

Also Published As

Publication number Publication date
GB1063500A (en) 1967-03-30
CH446868A (de) 1967-11-15

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