US2771848A - Feeding mechanisms for sewing machines - Google Patents

Feeding mechanisms for sewing machines Download PDF

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Publication number
US2771848A
US2771848A US455966A US45596654A US2771848A US 2771848 A US2771848 A US 2771848A US 455966 A US455966 A US 455966A US 45596654 A US45596654 A US 45596654A US 2771848 A US2771848 A US 2771848A
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United States
Prior art keywords
rocker
feed
carriers
eccentric
carrier
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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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US455966A
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English (en)
Inventor
Knaus Nicholaus
Agnes G Millington
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
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Singer Co
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Publication date
Application filed by Singer Co filed Critical Singer Co
Priority to US455966A priority Critical patent/US2771848A/en
Application granted granted Critical
Publication of US2771848A publication Critical patent/US2771848A/en
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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
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/06—Curved needles

Definitions

  • the invention has as a primary object to provide an improved means for adjusting the length of feeding movement of one of a pair of four-motion feed-dogs of a differential feeding mechanism during the operation of such mechanism.
  • Fig. l represents an end elevation, partly in section, of an overseaming machine showing the improved feeding mechanism.
  • Fig. 2 represents a sectional view taken substantially on the line 2--2 of Fig. 1.
  • Fig. 3 represents a sectional view taken substantially on the line 3 3 of Fig. l.
  • Fig. 4 represents a sectional view taken substantially on the line 4 4 of Fig. l.
  • Fig. 5 represents a sectional view taken substantially on the line 5 5 ofV Fig. 1.
  • Fig. 6 represents a sectional view taken substantially on the line 6 6 of Fig. 4.
  • Fig. 7 represents a disassembled perspective view of the main and auxiliary feed-bars and their actuating means.
  • Fig. 8 represents an end elevation of an overseaming machine embodying the present invention and illustrates the machine with a portion of the frame end wall broken away so as to illustrate a portion of the treadle control actuating means for the auxiliary feed-bar.
  • Fig. 9 represents a sectional view taken substantially on the line 9 9 of Fig. 1.
  • Fig. 10 represents a sectional view taken substantially on the line 1(1 10 of Fig. 8.
  • the reference numeral denotes a frame of an overseaming machine, 16 the head, and 17 a portion of the work support which is carried upon the frame in a conventional manner.
  • a presserfoot 18 is supported on the head 16 and the shank 19 of the foot is engaged by -a spring-biased member 20 whereby the foot is normally pressed downwardly toward the work support 17.
  • the rear 'portion of the shank 19 is mounted on a universal joint 21 in a conventional manner and a lever ⁇ 20 is provided for relieving the pressure of the spring-biased member 20.
  • Treadle-actuated means are provided for raising the shank 19 in opposition to the spring biased means 20 to permit introduction or adjustment of the work beneath the presser-foot 18. Since this mechanism does not form the part of the present invention, a complete disclosure thereof is not deemed necessary.
  • the machine is provided with a main rotary shaft 22 (see Fig. 3) which is journaled in the frame 15, and the shaft through a link, not herein illustrated, is connected with a needle-carrier 23 pivoted in a bushing 24 so that the rotation of the shaft 22 effects the oscillation of the carrier 23 within its bushing 24.
  • a needle 25 is mounted in the carrier 23 and the oscillation of the latter causes the needle to reciprocate and penetrate the goods that are supported upon the work support 17.
  • Suitable stitch-forming implements or loopers cooperate with the needle to effect the formation of the overseaming stitches, but as these loopers and the manner of and the means for actuating them form no part of the present invention, their illustration and further description are not deemed necessary.
  • the present work-feeding mechanism is of the differenti-al type including a main feed-dog 26 and an auxiliary feed-dog 27 which are mounted, respectively, on the sideby-side main and auxiliary feed-dog carriers or bars 28 and 29 slidingly supported at their forked rear ends 30 and 31 upon blocks 32 and 33 (see Figs. 1 and 5).
  • Each of these blocks 32 and 33 is appropriately apertured so that to be snugly entered and supported by a pin 34 which is force-fitted within an apertured bushing 35 secured within a portion of the main frame 15.
  • the bars 28 and 29 are actuated in a manner such that they will both oscillate and move longitudinally about and relative to the pin 34 of which the longitudinal axis is common to both of the feed-bars.
  • the feed-bars 28 and 29 receive their rising and falling movements from a feed-lift eccentric 36 carried by the main shaft 22; said eccentric being surrounded by the usual bearing block 37 which ts in ways 38 and-39 formed in the feed-bars 28 and 29.
  • the feed and return movements are imparted to the main feed-bar 28 from a feed eccentric 40 removably and replaceably keyed upon the outer end of the main shaft 22 and held thereon by a nut 41 which is threaded over the distal end portion 42 of the main shaft 22 spaced between the eccentric 40 and the feed-bar 28 is a conventional washer 40.
  • the feed eccentric 40 is embraced by the apertured end portion 43 of a pitman 44 which connects the eccentric 40 directly to the main feed bar 28 by means of a bolt 45 which passes through aperture 46 in the feed-bar 28 and through the apertured rear end portion 47 of the pitman 44, which bolt 45 is locked in position by means of a nut 48.
  • a spacer sleeve 45 is disposed over the bolt between the pitman 44 and the feed-bar 28.
  • rotation of the eccentric 40 will, through the medium of the pitman- 44, reciprocate the main feed-bar 28 back and forth lengthwise of itself.
  • Alteration of the amplitude of the feed return movements of the main feed-bar 28 is effected by substitution of feed eccentrics of the desired eccentricities, for that eccentric 40 illustrated in the present machine.
  • the pitman 44 together with its associated eccentric 40, are also adapted to impart feed and return movements ⁇ to the auxiliary feed 'bar 29 through the medium of a rocker mechanism.
  • This rocker mechanism comprises a two-armed bracket (see Figs. l, 6 and 9) having'its arms v50 and 51 secured to the machine base 15 by bolts 52. The free end portions of thisl bracket are apertured as at 53 for rockably receiving therein a shaft 54 upon which is mounted a rock member generally designated by the numeral 55. A set screw 55' locks the member 55 to the shaft 5d.
  • the rock member 5S is formed with two arms 56 and 57 o which the latter is provided with 'an ⁇ :extension 58 formed las an varcuate member or segfment.
  • the free end ,portion of the arm 56 is apertured a-s at 56' Vand is adapted to be connected by means 'of a v-'bolt 59 to-an apertured end portion v60 of a link 61 (see Figs. 2 and 7).
  • a slide block Slidingly mounted upon and lengthwise of the rocker arm or segment S3 -is a slide block generally designated by the numeral 63, ywhich slide block has .projecting from the opposite sides thereof stub-shafts 64-64 upon lwhich are mounted the opposite side portions -65 and 66 of a two-part link member which in Fig. 4 is .designated generally by the numeral 67.
  • each of the apertured end portions 625-68 of the -link arms 65 .and 66 is adapted to be kpivotally mounted upon one'of thestub shafts 64 while the mid-portions of the two :frnem'bers 65 and 66 are secured together ⁇ by means of a 'bolt 69 and an associated spacer member 70.
  • the other end portions of the members 65 Iand 66 carry a hollow sleeve 71 which projects through an aperture IZ formed inthe main feed-bar 2d so as to be secured to the auxiliary feed-hariw by means of a bolt 73 which is threaded directly -within -an aperture 74 provided in the auxiliary feed-bar 29.
  • the above noted slide block 63 comprises a U-shaped strap 75 having conventional type convex shoes '76, 77 mounted therein for engaging .the opposite edge portions of the .rocker -arm 5S.
  • the free end ⁇ portions of the U-.shaped strap 75 are closed -by a bolt ⁇ FIS and a spacer sleeve 79.
  • one of the hollow stub shafts 65. of the slide block 63 is elongated for the purpose of having mounted thereon the upper ⁇ apertured collar portion 80 -of a link 81 of which the lower apertured end portion 82 is provided with a -hollow 'boss .member S3 pivotally received within an aperture S4' provided in the ,projecting end S5 of a crank member'86.
  • AIt will also be observed that the upper end porti-on of 'the .link 81 and its projecting collar '80 are freely disposed within an arcuate slot '87 formed inthe endportion of the crank 86, which slot 87 functions as aguide for the collar 80.
  • the end portion 88 of the crank 86 is keyed upon a shaft S9 journaled in a bracket portion 1S of the sewing 'machine frame 1:5, which shaft 89 has keyed upon its other end .
  • portion a segment gear 90 which meshes with a second segment gear 91 mounted upon a second crank member 92 which is pivotally mounted upon the bracket 15 about the .longitudinal axis of a supporting bolt 93.
  • the present mechanism is designed in a manner such that with the slide block 63 at a position near the 4base portion of thefarm 5'8 ⁇ the auxiliary feed 'bar 29 will be given aback and forth movement which will eX- actly coincide with 'that of the main feed-bar ZSto 'the end that ynogathering feed will result.
  • the slide 'block is moved to its fullest extent toward the base of thearm 158-the 'timing-of the back and forth movements of the auxiliary feed-bar29 will be such that a stretching of the work will occur because of the differential movemen-t between the feed-bars 28 and 29.
  • the slide block 63 is moved outwardly ialong the crank arm l15S the amplitude of the feed and return movements of. the auxiliary feed-bar 29 will increase to the end 'that agathering feed action will result.
  • the lshoulder portion'95 of the segment gear is provided Withaspring 96 of which one end is locked labout a ylock screw-197 fastened to the. bracket 15 while the other end is locked as lat 98 to the segment gear 9,0 to the end thatfthe spring will. urge the segment gear 90 to turn in a counterclockwise direction'as viewed in Fig. 8. In other words, the spring 96 will effectively urge the slide block 63ffto moveina direction toward the base portion of the segment arm 58. l y,
  • the free end portion of the second crank 92 is provided with a .notch 99 for lreceiving a chain 100 which may be connected in aconventionalmanner -to a foot tread'le so that the operator may manually .shift .the slide block 63 back and forth to produce various degrees of diierential feeding movement between vthe .main and auxiliary feed-bars 28 and 29.
  • the spring 96 operates lin a manner such as to urge constantly the free end portion of the crank 92 in an upward direction.
  • crank 92 operates up and down in a chamber formed between two spaced opposing Walls 101 and 102 of the sewing machine frame, which walls have aligned vertically disposed slots 103 and 104.
  • each of the bolts may be backed away from its associated nut 110 so as to permit the Abolts to be adjusted lengthwise of the slot 104 to any desired position, ⁇ and thereafter the bolt may be retightened so that the .nut ⁇ 110 and its associated skirt 108 will function to lock the bolt in any desiredposition of adjustment.
  • the ybolts 105 and 106 function as adjustable stops toarrest the upward and downward movements of the crank 92 to the end that hetoperator may adjust the .upper and lower limits of the movement of the slide block 63.
  • indicia 111 and numerals may beprovided upon the face of the frame 'wall 101 to show the operator the amount of differential feed adjustment effected by the movements of the crank 92.
  • Differential feeding mechanism fork a sewing machine comprising, a .main .rotary shaft, a plurality of eccentric elements carried upon said shana pair of feed kdog carriers supported .for voscillatory vand reciprocatory movement with each-carrier embracing anfeccentric element -so as to' be oscillated thereby, a pitman lhaving ⁇ one end thereof embracing one of said eccentric elements and its other end connected directly with a rst of said carriers for imparting reciprocatory movement thereto, a rocker pivotally mounted about a xed axis, means pivotally connecting one of said eccentric elements with said rocker thereby to oscillate said rocker about its axis, means separate from said last mentioned means slidably connected with said rocker and pivotally connected with the second of said carriers for imparting reciprocating movements to such carrier, and manually operable means for shifting the slidable connection between said last mentioned means and said rocker thereby to vary the amplitude of reciprocatory movement imparted to said second carrier by
  • Differential feeding mechanism for a sewing machine comprising, a main rotary shaft, a plurality of eccentric elements carried upon said shaft, a pair of feeddog carriers supported for oscillatory and reciprocatory movement with each carrier embracing an eccentric element so as to be oscillated thereby, a pitman having one end thereof embracing one of said eccentric elements and its other end connected directly with a first of said carriers for imparting reciprocatory movement thereto, a rocker pivotally mounted about a fixed axis, means pivotally connecting one of said eccentric elements with said rocker thereby to oscillate said rocker about its axis, means separate from said last mentioned means slidably connected with said rocker and pivotally connected with the second of said carriers for imparting reciprocating movements to such carrier, manually operable means for shifting the slidable connections between said last mentioned means and said rocker thereby to vary the amplitude of reciprocatory movement imparted to said second carrier by said rocker, and manually adjustable means associated with said manually operable means for arresting the movement thereof in various selected positions.
  • Differential feeding mechanism for a sewing machine comprising, a main rotary shaft, a plurality of eccentric elements carried upon said shaft, a pair of feeddog carriers supported for oscillatory and reciprocatory movement with each carrier embracing an eccentric element so as to be oscillated thereby, a pitman having one end thereof embracing one of said eccentric elements and its other end connected directly with a rst of said carriers for imparting reciprocatory movement thereto, a rocker pivotally mounted about a fixed axis, means pivotally connecting one of said eccentric elements with said rocker thereby to oscillate said rocker about its axis, means separate from said last mentioned means slidably connected with said rocker and pivotally connected with the second of said carriers for imparting reciprocating movements to such carrier, spring means biasing the slidable connection between said last mentioned means and said rocker toward the axis of rocker oscillation thereby to produce a minimum amplitude of reciprocatory movement of said second carrier, and manually operable means for shifting the slidable connection relative to said rocker and away from
  • Dilerential feeding mechanism for a sewing machine having a frame comprising, a main rotary shaft, a plurality of eccentric elements carried upon said shaft, a pair of feed-dog carriers each embracing at its front end portion one of said eccentric elements so as to be oscillated thereby, a support carried by said frame and engaging the rear end portions of said carriers for supporting such end portions and forming an axis common to both carriers with reference to which axis the carriers have pivotal and longitudinal movements, a pitman having one end thereof embracing one of said eccentric elements and its other end connected directly with a first of said carriers for imparting reciprocatory longitudinal movement thereto, a rocker pivotally mounted about a fixed axis, means pivotally connecting one of said eccentric elements with said rocker thereby to oscillate said rocker about its axis, means separate from said last mentioned means slidably connected with said rocker and pivotally connected with the second of said carriers for imparting reciprocating movements to such carrier, and manually operable means for shifting the connection between said last mentioned means and said rocker thereby to vary
  • Dilerential feeding mechanism for a sewing machine comprising, a main rotary shaft, a plurality of eccentric elements carried upon said shaft, a pair of feeddog carriers supported for oscillatory and reciprocatory movement with each carrier embracing an eccentric element so as to be oscillated thereby, a pitman having one end thereof embracing one of said eccentric elements and its other end connected with each of said two carriers for imparting reciprocatory movement thereto, and manually operable means interposed between said pitman and one of said two carriers for creating selective amplitudes of differential reciprocatory movements between said two carriers.
  • Differential feeding mechanism for a sewing machine comprising, a main rotary shaft, a plurality of eccentric elements carried upon said shaft, a pair of feeddog carriers supported for oscillatory and reciprocatory movement with each carrier embracing an eccentric element so as to be oscillated thereby, a pitman having one end thereof embracing one of said eccentric elements and its other end connected directly with a first of said carriers for imparting reciprocatory movement thereto, a rocker pivotally mounted about a fixed axis, means pivotally connecting said pitman with said rocker thereby to oscillate said rocker about its axis, means separate from said last mentioned means slidably connected with said rocker and pivotally connected with the second of said carriers for imparting reciprocatory movement to such carrier, and manually operable means for shifting the slidable connection between said last mentioned means and said rocker thereby to vary the amplitude of reciprocatory movement imparted to said second carrier by said rocker.
  • Differential feeding mechanism for a sewing machine comprising, a main rotary shaft, a plurality of eccentric elements carried upon said shaft, a pair of feeddog carriers supported for oscillatory and reciprocatory movement with each carrier connected with an eccentric element so as to be oscillated thereby, a pitman having one end thereof embracing one of said eccentric elements and its other end connected directly with a Iirst of said carriers for imparting reciprocatory movement thereto, a rocker pivotally mounted about a xed axis, means pivotally connecting said rst carrier with said rocker thereby to oscillate said rocker about its axis, means slidably connected with said rocker and pivotally connected with the second of said carriers for imparting reciprocating movements to such carrier, and manually operable means for shifting the slidable connection between said last mentioned means and said rocker thereby to vary the amplitude of reciprocatory movement imparted to said second carrier by said rocker.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US455966A 1954-09-14 1954-09-14 Feeding mechanisms for sewing machines Expired - Lifetime US2771848A (en)

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Application Number Priority Date Filing Date Title
US455966A US2771848A (en) 1954-09-14 1954-09-14 Feeding mechanisms for sewing machines

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Application Number Priority Date Filing Date Title
US455966A US2771848A (en) 1954-09-14 1954-09-14 Feeding mechanisms for sewing machines
GB6561/55A GB765723A (en) 1955-03-05 1955-03-05 Feeding mechanism for sewing machines

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US2771848A true US2771848A (en) 1956-11-27

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US (1) US2771848A (de)
CH (1) CH331815A (de)
FR (1) FR1120829A (de)
GB (1) GB765723A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967498A (en) * 1958-05-01 1961-01-10 Willcox & Gibbs Sewing Machine Top feed attachments for sewing machines
US3018745A (en) * 1959-11-16 1962-01-30 Merrow Machine Co Sewing machine feed mechanism
US3038426A (en) * 1959-02-20 1962-06-12 Flex O Lators Sewing machine attachment
US3077167A (en) * 1958-09-03 1963-02-12 Louis H Morin Apparatus for synchronizing stitchings with longitudinally spaced workpieces and with the formation of workpieces
FR2330794A1 (fr) * 1975-11-07 1977-06-03 Rockwell Rimoldi Spa Dispositif de reglage de l'entrainement du travail sur une machine a coudre
US4674426A (en) * 1984-07-11 1987-06-23 Pegasus Sewing Machine Mfg. Co., Ltd. Feed mechanism for sewing machine
US5101748A (en) * 1986-08-29 1992-04-07 Union Special G.M.B.H. Feed dog drive for sewing machines
US5103751A (en) * 1991-02-12 1992-04-14 Wang Shui Nu Differential feeding apparatus for a sewing machine
US20170321361A1 (en) * 2016-05-06 2017-11-09 Bernina International Ag Device and method for manually changing a feed dog
US11434592B2 (en) 2017-10-06 2022-09-06 Hamer-Fischbein Llc Sewing stitch length adjustment mechanisms

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659330A (en) * 1950-06-30 1953-11-17 Singer Mfg Co Feeding mechanisms for sewing machines
US2667851A (en) * 1951-11-14 1954-02-02 Singer Mfg Co Feeding mechanism for sewing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2659330A (en) * 1950-06-30 1953-11-17 Singer Mfg Co Feeding mechanisms for sewing machines
US2667851A (en) * 1951-11-14 1954-02-02 Singer Mfg Co Feeding mechanism for sewing machines

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967498A (en) * 1958-05-01 1961-01-10 Willcox & Gibbs Sewing Machine Top feed attachments for sewing machines
US3077167A (en) * 1958-09-03 1963-02-12 Louis H Morin Apparatus for synchronizing stitchings with longitudinally spaced workpieces and with the formation of workpieces
US3038426A (en) * 1959-02-20 1962-06-12 Flex O Lators Sewing machine attachment
US3018745A (en) * 1959-11-16 1962-01-30 Merrow Machine Co Sewing machine feed mechanism
FR2330794A1 (fr) * 1975-11-07 1977-06-03 Rockwell Rimoldi Spa Dispositif de reglage de l'entrainement du travail sur une machine a coudre
US4674426A (en) * 1984-07-11 1987-06-23 Pegasus Sewing Machine Mfg. Co., Ltd. Feed mechanism for sewing machine
US5101748A (en) * 1986-08-29 1992-04-07 Union Special G.M.B.H. Feed dog drive for sewing machines
US5103751A (en) * 1991-02-12 1992-04-14 Wang Shui Nu Differential feeding apparatus for a sewing machine
US20170321361A1 (en) * 2016-05-06 2017-11-09 Bernina International Ag Device and method for manually changing a feed dog
US20180245256A1 (en) * 2016-05-06 2018-08-30 Bernina International Ag Device and method for manually changing a feed dog
US10174448B2 (en) * 2016-05-06 2019-01-08 Bernina International Ag Device and method for manually changing a feed dog
US10273614B2 (en) * 2016-05-06 2019-04-30 Bernina International Ag Device and method for manually changing a feed dog
US11434592B2 (en) 2017-10-06 2022-09-06 Hamer-Fischbein Llc Sewing stitch length adjustment mechanisms

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Publication number Publication date
CH331815A (de) 1958-08-15
FR1120829A (fr) 1956-07-13
GB765723A (en) 1957-01-09

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