US2667851A - Feeding mechanism for sewing machines - Google Patents

Feeding mechanism for sewing machines Download PDF

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Publication number
US2667851A
US2667851A US256242A US25624251A US2667851A US 2667851 A US2667851 A US 2667851A US 256242 A US256242 A US 256242A US 25624251 A US25624251 A US 25624251A US 2667851 A US2667851 A US 2667851A
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United States
Prior art keywords
rocker
feed
arm
carrier
pitman
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
US256242A
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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
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
Priority to US24005D priority Critical patent/USRE24005E/en
Application filed by Singer Co filed Critical Singer Co
Priority to US256242A priority patent/US2667851A/en
Priority to FR1069100D priority patent/FR1069100A/fr
Priority to GB27722/52A priority patent/GB705829A/en
Priority to DES31004A priority patent/DE1026601B/de
Priority to CH316699D priority patent/CH316699A/de
Application granted granted Critical
Publication of US2667851A publication Critical patent/US2667851A/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
    • 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
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/08—Work-feeding means with feed dogs having horizontal and vertical movements with differential feed motions

Definitions

  • This invention relates to feeding mechanisms for sewing machines, and more particularly to that type of feeding mechanism known as a differential feed in which two work-feeding elements are adapted to be actuated so as to exert unequal feeding actions on the work, thereby either to stretch or full the work as required.
  • 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 fourmotion feed-dogs of a differential feeding mechanism during the operation of such mechanism.
  • a further object of the present invention is to provide indicia means which is so mounted and so actuated as to provide a sewing machine operator at all times with a visual indication as to the degree of differential movement existing between the two feeding elements which comprise a so-called differential feeding mechanism.
  • the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.
  • Fig. 1 represents an end elevation, partly in section, of an overseaming machine and showing the improved feeding mechanism.
  • Fig. 2 represents a sectional view taken substantially along the line Z2 of Fig. 1.
  • Fig. 3 represents a sectional view taken substantially along the line 3-3 of Fig. 1.
  • Fig. 4 represents a disassembled perspective view of the main and auxiliary feed-bars and their actuating means.
  • Fig. 5 represents a sectional view taken substantially along the line 5--5 of Fig. 1.
  • Fig. 6 represents a sectional view taken substantially along the line fi6 of Fig. 5.
  • Fig. '7 represents a sectional view taken substantially along the line 7-4 of Fig. 6.
  • 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-controlled adjusting means for the auxiliary feed-bar.
  • Fig. 9 represents a rear elevation view of a sewing machine embodying the present invention and illustrates the rear portion of an indicia plate and indicia finger which cooperate together to give the sewing machine operator a visual indication of the degree of differential movement which exists between the main and auxiliary feed-dogs.
  • Fig. 10 represents a fragmentary sectional view taken substantially along the line Ill-i 0 of Fig. 8.
  • Fig. 11 represents a fragmentary plan view of the left hand portion of the machine shown in Fig. 1, with a part of the machine frame in section.
  • the reference numeral [5 denotes the frame or casting of an overseaming machine, 16 the head and H the work-support (see Fig. 8) which is carried upon the frame in a conventional manner.
  • a presserfoot I 8 is supported on the head It and the shank I!) of the foot is engaged by a spring-biased member 20, whereby the foot is normallyv pressed downwardly toward the work-support [1.
  • the rear portion of the shank I9 is mounted on a universal joint 2! in a conventional manner and a lever 22 is provided for relieving the pressure of the spring-biased member 20.
  • Treadle-actuated means are provided for raising the shank I9, in opposition to the springbiased means 20, to permit introduction or adjustment of the work beneath the presser-foot, l8.
  • This means comprises a rod 23 journaled in a portion of the machine frame I6 parallel to the shank l9 and carrying at its rear end, a laterally projecting plate 24 adapted to be connected at its free end portion 24' with a chain or other suitable connection, with a conventional knee or foot-actuated treadle, not shown. Adjacent its forward end the rod 23 has secured to it, b screws 25, a collar 26 having an oifset arm 2'! providing a portion 28 underlying a laterally projecting portion 29 of the shank I9.
  • the portion 28 of the arm 21 is formed as a roller stud, and a laterally projecting portion of the shank l9 comprises a shoulder stud having a shank 30 extending through an aperture in the shank l9 and secured I thereto by a nut 3
  • the rod 23 is normally biased clockwise, as viewed in Fig. 11 by a coil spring 32 surrounding the rod, and having one end 33 fitted to an aperture in the arm 24.
  • the opposite end 34 of this spring projects through a slot 35 in a portion of the frame 16.
  • the machine is provided with a main rotary shaft 36 (see Fig. 2) which is journaled in the frame l5, and this shaft, through a link not herein illustrated, is connected with a needle carrier 31 pivoted ina bushing 38'so that the effect the formation of the overseaming stitches, H
  • the present work-feeding mechanism is of the 4 43 through the medium of the eccentric 58, the second pitman 59, the rocker BI and the link 68.
  • the arm 60 is of arcuate form, the axis of curvature being the center of the shaft 36.
  • the amount of lengthwise movement transmitted to the feed-bar 43 from any given degree of oscillation of the shaft 36 depends upon the setting of the block 62 upon the arm 69. This setting may be varied in a manner as will hereinafter be described.
  • slide-block 62 comprises a U-shaped strap lm provided with a pair of coaxially aligned studs 7! and E2 of which stud H enters an aperture 13 provided in the rear end portion of the second pitman 59.
  • the strap '58 carries a ishoe l4'having arconvex face i which engages differential type including a main feed-dog 4i] and an auxiliary feed-doglll which are mounted, respectively, on the side by side main and auxiliary feed-dog carriers or bars 42 and 43 slidingly' supported at their forked rear ends 44 and 45 upon blocks 46 and 41 (see Figs. 5 and 6).
  • Each of these blocks 46 and 41 is appropriately apertured so as to be snugly entered by a pin 48 which is force-fitted within an apertured bushing 49 secured within a portion of the main frame I6.
  • the bars 42 and 43 are actuated in a manner such that they will both oscillate and move longitudinally about and relative to the pin 48 of which the longitudinal axis iscommon to both of the feed-bars.
  • the feed-bars 42 and 43 receive their rising and falling movements from a feed-lift eccentric 50 on the main shaft 36; said eccentric being surrounded by the usual bearing block 5
  • the feed and return movements are imparted to the main feed-bar 42 from a main feed eccentric 54 removably and replaceably keyed upon the outer end of the main shaft 36 and held thereon by a nut 55.
  • the main feed-eccentric 54 is connected by a first pitman 56 to a lateral post 5'! rigid with the main feed-bar 42. Alteration of the amplitude of the feed and return movements of the main feed-dog 49 is effected by substitution of feed eccentrics of the desired eccentricities, for that eccentric 54 illustrated in the present machine.
  • themain shaft 33 is provided with an auxiliary. feed-eccentric 58 keyed upon the shaft 36 and removable there from in the same manner as the main feedeccentric 54.
  • Embracing the eccentric 58 is the forward portion of a second pitman 59 of which the rearward portion is pivotally and slidably connected with a curved arm 69 of a rocker 6! by means of a slide-block generally designated by the numeral 52.
  • is mounted upon a horizontal pin 6
  • the rocker Bl with its two armsfii] and 66 pivot about the longitudinal axis of the pin Bl in response to the movements of the second pitman 59.
  • the upper end portion of the rocker arm 63 is pivotally secured, by means of a bolt 61, to one end portion of a link 68 whose other end portion is pivotally secured to the auxiliary feed-bar 43 by means of a bolt 69.
  • the shoe 15 also has on its outer face a concave surface 13 adapted to receive the periphery of a washer l9 journaled eccentrically on a clamp screw 39 connecting the free ends of the strap 10.
  • the washer i9 is provided with a plurality of radially extending holes 8! adapted to receive the end of the pin, or other element, by means of which the eccentric Washer may be rotated on the screw 89, thereby to shift the shoe 16 towards the arm and compensate for wear on the parts.
  • the amount of portion thereof a longitudinal slot 35 which is adapted to receive the stud 12 of the strap E0;
  • the other end portion of the arm 84 is secured to its associated arm 83 by means of a screw 81' and two spacer sleeves 88 and 99 of which the V latter is pivotally mounted within an aperture 90 provided in the projecting portion 83 of the machine frame.
  • the arm 86 of the crank 82 is provided with a slotted end portion 9
  • slide-block 62 will be moved downwardly along the rocker arm 60 so as progressively to increase the amplitude of longitudinal movement of the auxiliaryfeed-bar 43 so that a gathering feed action will be eifected.
  • crank arm 86 is provided with a pin 93 which enters a slotted portion 94 of a bell-crank lever generally designated by the numeral 95.
  • This bell-crank lever 95 is mounted on a stud 9B threaded directly into the sewing machine frame.
  • a coil spring 9'! wrapped about the stud 85 has its one free end portion 98 anchored by means of a screw 99 to the machine frame while its other end portion I06 is anchored by means of a screw I0! to one arm I52 of the bell-crank lever 95.
  • This spring is so arranged as normally to maintain the arm 85 of the crank 82 in a horizontal position, whereby the pivot block 62 will be in the position illustrated in Fig. 1 to the end that the longitudinal feeding movements of the feed-bars 42 and All will be exactly the same.
  • the upward movement of the crank arm 86 is arrested by the top wall of a slot I63 through which the arm projects.
  • the upstanding arm HM of the bellcrank lever 95 projects upwardly above the work-supporting I.
  • indicia finger 95 which is adapted to track across the upper arcuate portion of the presser-bar lifting arm or plate 2
  • the front portion of the plate 24 is provided with appropriate indicia so that as the bell-crank 95 is pivoted about the screw 96, under the control of the operator, the indicia finger H85 will give the operator a visual indication as to the amount of differential feeding action effected.
  • the rear portion of the presserbar lifting plate 24 is provided with a plurality of threaded apertures I86 of which each is adapted to receive a thumb screw till, the function of which is to act as a stop for the bell crank lever 95 as the latter is moved in a clockwise direction as viewed in Fig. 9.
  • the apertures IE6 may be so placed within the plate 2&- as to provide index means whereby the thumb screw I01 may be selectively positioned to the end that upon the lowering of the chain 92 the slide-block 62 will be shifted to a predetermined position, thus giving the operator automatically this invention has provided an improved feeding mechanism for sewing machines having main and. auxiliary feed-dogs, which mechanism.
  • the present feed adjusting means is provided with novel and meritorious means for adjusting the feed-advance stroke of the auxiliary feed-dog during the operation of the machine so as to provide a wide range of differential feed action. Furthermore, the present feed adjusting means is provided with a simple but effective indicia device which functions to give the sewing machine operator 2. visual indication at all times of the degree of difierential feeding action effected by the adjusting mechanism.
  • Sewing machine feed mechanism including in combination, a pair of eccentrics, a normally stationary feed guide, a feed-dog carrier supported for oscillatory and reoiprocatory movements with one end thereof slidably engaging said feed guide and with its other end embracing 6 one of said eccentrics, a rocker, a link connecting said rocker with said carrier for imparting reciprocatory movements to said carrier, a'slide block movably carried upon said rocker, a pitman having one end embracing the other of said eccentrics and its other end connected to said slide block for actuating said rocker, and means connected with said slide block for shifting the same lengthwise of said rocker thereby to vary the amplitude of swing imparted to said rocker.
  • Sewing machine feed. mechanism including in combination, a pair of eccentrics, a feed-dog carrier supported for oscillatory and reciprocatory movement and embracing one of said eccentrics, a rocker having two arms and being pivotally mounted about a fixed axis, a link connecting one arm of said rocker with said carrier for imparting reciprocatory movements to said carrier, a slide block shiftably carried upon the other arm of said rocker, a pitman having one end embracing the other of said eccentrics and its other end connected to said slide block for swinging said rocker about its fixed axis, and means connected with said slide block for shifting the same lengthwise of its associated rocker arm thereby to vary the amplitude of swing imparted to said rocker.
  • Sewing machine feed mechanism including in combination, a rotary shaft, a pair of eccentrics carried upon said shaft, a normally stationary feed guide, a feed-dog carrier supported for oscillatory and reciprocatory movements with one end thereof slidably engaging said feed guide and with its other end embracing one of said eccentrics, a rocker having two arms and being pivotally mountedabout a fixed axis, a link connecting one arm of said rocker with said carrier for imparting reciprocatory movements to said carrier, a slide block slidably mounted upon the other arm of said rocker, a pitman having one end embracing the other of said eccentrics and its other end connected to said slide block for swinging said rocker about its fixed axis, and means connected with said slide block for shifting the same lengthwise of its associated rocker arm thereby to vary the amplitude of swing imparted to said rocker.
  • a sewing machine comprising a frame, a pair of eccentrics, a feed-dog carrier supported for oscillatory and reciprocatory movement and embracing one of said eccentrics, a rocker having pivotal connection with said carrier for imparting reciprocatory movements to said carrier, a pitman having one end embracing the other of said eccentrics and its other end pivotally and slidably connected to said rocker for actuating said rocker, an indicia plate mounted upon said frame, an indicia finger mounted adjacent said 'platefor tracking across the face thereof, and
  • means including a manually adjustable lever operatively connected with said pitman and said indicia finger for sliding the point of connection of said pitman and said rocker thereby to vary the amplitude of longitudinal motion transmitted to said carrier and for shifting said indicia finger relative to said indicia plate.
  • a sewing machine comprising a frame, a pair of eccentrics, a feed-dog carrier supported for oscillatory and reciprocatory movements and embracing one of said eccentrics, a rocker having pivotal connection with said carrier for imparting reciprocatory movements to said carrier, a slide block shiftably carried upon said rocker, a pitman having one end embracing the other of said eccentrics and its other end connected to said slide block for actuating said rocker, an indicia plate mounted upon said frame, an indicia finger mounted adjacent said plate for tracking across the face thereof, and means connected with said slide block and said indicia finger for shifting said slide block lengthwise of said rocker thereby to vary the amplitude of swing imparted to said rocker and for shifting said indicia finger relative to said plate.
  • Differential feeding mechanism for a sewing machine comprising, a plurality of eccentric elements, a pair of feed-dog carriers supported for oscillatory and reciprocatory movement with each carrier embracing an eccentric element so as to be oscillated thereby, a first pitman connecting one of said eccentric elements with a first of said carriers for imparting reciprocatory movement thereto, a rocker having pivotal connection with the second of said carriers for imparting reciprocatory movements to said carrier, a second pitman having one end embracing one of said eccentric elements and its other end pivotally and slidably connected to said rocker for actuating the same, and means including a manually adjustable lever operatively connected with said second pitman for sliding the point of connection of such pitman and said rocker thereby to vary the amplitude of reciprocatory motion transmitted to said second carrier.
  • a differential feeding mechanism for a sewing machine having a frame comprising, a pair of feed-dog carriers, a support carried by said frame and forming an axis common to both carriers with reference to which axis the carriers have pivotal and longitudinal movements, a rotary shaft journaled in said frame, a plurality of eccentric elements carried by said shaft, said two carriers each being connected to an eccentric element so as to be pivotally actuated thereby, a first pitman connecting one of said eccentric elements with a first of said two carriers for imparting longitudinal movement thereto, a rocker arm pivotally mounted upon said frame about a fixed axis, a second pitman having one end thereof embracing one of said eccentric elements and its other end pivotally and slidably connected with said rocker arm for oscillating the latter about its pivot axis, a link connecting said rocker arm with the second of said carriers for imparting longitudinal movement thereto, and means including a manually adjustable lever operatively connected with said second'mentioned pitman for sliding the point of connection of said second pitman with
  • an indicia plate an indicia finger mounted for tracking across said plate, and means including a manually adjustable lever operatively connected with said second pitman and said indicia finger for sliding the point of connection of such pitman and said rocker thereby to vary the amplitude of reciprocatory motion transmitted to said second carrier and for shifting said indicia finger relative to said indicia plate.
  • a sewing machine havinga frame, a rotary shaft journaled in said frame, a feed-dog carrier slidably pivoted to said frame for oscillatory and reciprocatory movement, means carried by said shaft and connected with said carrier for imparting oscillatory motion thereto, a rocker pivotally secured to said frame, a slide block shiftably carried upon said rocker, means connecting said shaft with said slide block for swinging said rocker about its pivot, a link connecting said rocker with said carrier thereby to impart reciprocatory movements to said carrier, and means for shifting said slide block on said rocker thereby to vary the amplitude of reciprocatory movements imparted to said carrier.
  • Sewing machine feed mechanism including in combination, a rotary shaft, a pair of eccentries carried upon said shaft, a feed-dog carrier supported for-oscillatory and reciprocatory movement and embracing one of said eccentrics, a rocker having pivotal connection with said carrier for imparting reciprocatory movements to said carrier, .a pitman having one end embracing the other of said eccentrics and its other end pivotally and slidably connected to said rocker for actuating said rocker, and means operatively connected with said pitman for sliding the point of connection of said pitman and said rocker thereby to vary the amplitude of reciprocatory motion transmitted to said carrier.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US256242A 1951-11-14 1951-11-14 Feeding mechanism for sewing machines Expired - Lifetime US2667851A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US24005D USRE24005E (en) 1951-11-14 Knaus ctal
US256242A US2667851A (en) 1951-11-14 1951-11-14 Feeding mechanism for sewing machines
FR1069100D FR1069100A (fr) 1951-11-14 1952-11-03 Mécanisme d'entraînement pour machines à coudre
GB27722/52A GB705829A (en) 1951-11-14 1952-11-04 Feeding mechanisms for sewing machines
DES31004A DE1026601B (de) 1951-11-14 1952-11-07 Differentialvorschubeinrichtung fuer Naehmaschinen
CH316699D CH316699A (de) 1951-11-14 1952-11-12 Differential-Stoff-Vorschubvorrichtung an einer Nähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US256242A US2667851A (en) 1951-11-14 1951-11-14 Feeding mechanism for sewing machines

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US2667851A true US2667851A (en) 1954-02-02

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US24005D Expired USRE24005E (en) 1951-11-14 Knaus ctal
US256242A Expired - Lifetime US2667851A (en) 1951-11-14 1951-11-14 Feeding mechanism for sewing machines

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Application Number Title Priority Date Filing Date
US24005D Expired USRE24005E (en) 1951-11-14 Knaus ctal

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US (2) US2667851A (de)
CH (1) CH316699A (de)
DE (1) DE1026601B (de)
FR (1) FR1069100A (de)
GB (1) GB705829A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731929A (en) * 1956-01-24 Sewing machine
US2771848A (en) * 1954-09-14 1956-11-27 Singer Mfg Co Feeding mechanisms for sewing machines
DE975242C (de) * 1954-03-16 1961-10-12 Duerkoppwerke Ag Naehmaschine mit einer senkrecht auf und ab bewegten Nadelstange und mit einem oberen und einem unteren Stoffschieber
US3009430A (en) * 1955-03-12 1961-11-21 Union Special Maschinenfab Overedge sewing machines
US3416473A (en) * 1965-02-01 1968-12-17 Union Special Machine Co Combined feed mechanism with stepped feed-dogs for sewing machines
DE2648266A1 (de) * 1975-11-07 1977-05-12 Rockwell Rimoldi Spa Vorschub-einstellvorrichtung fuer naehmaschinen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2769416A (en) * 1953-11-19 1956-11-06 Merrow Machine Co Feed control for shirring mechanism
US2965056A (en) * 1957-07-25 1960-12-20 Union Special Machine Co Sewing machines
DE1091842B (de) * 1959-04-13 1960-10-27 Duerkoppwerke Ag Stoffvorschubeinrichtung fuer Naehmaschinen
US5526761A (en) * 1992-08-19 1996-06-18 Porter Sewing Machines, Inc. Method and apparatus for closing mattresses
US5309854A (en) * 1992-08-19 1994-05-10 Porter Sewing Machines, Inc. High lift sewing machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1071818A (en) * 1913-09-02 Merrow Machine Co Feeding mechanism for sewing-machines.
US1326026A (en) * 1919-12-23 Sewing-machine
US1327647A (en) * 1920-01-13 Combined looper and feeding mechanism for sewing machines
US2341448A (en) * 1941-05-07 1944-02-08 Singer Mfg Co Feeding mechanism for sewing machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE680448C (de) * 1934-12-31 1939-08-28 Mauser Werke Ag Differentialstoffschiebervorrichtung fuer Tragarmnaehmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1071818A (en) * 1913-09-02 Merrow Machine Co Feeding mechanism for sewing-machines.
US1326026A (en) * 1919-12-23 Sewing-machine
US1327647A (en) * 1920-01-13 Combined looper and feeding mechanism for sewing machines
US2341448A (en) * 1941-05-07 1944-02-08 Singer Mfg Co Feeding mechanism for sewing machines

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2731929A (en) * 1956-01-24 Sewing machine
DE975242C (de) * 1954-03-16 1961-10-12 Duerkoppwerke Ag Naehmaschine mit einer senkrecht auf und ab bewegten Nadelstange und mit einem oberen und einem unteren Stoffschieber
US2771848A (en) * 1954-09-14 1956-11-27 Singer Mfg Co Feeding mechanisms for sewing machines
US3009430A (en) * 1955-03-12 1961-11-21 Union Special Maschinenfab Overedge sewing machines
US3416473A (en) * 1965-02-01 1968-12-17 Union Special Machine Co Combined feed mechanism with stepped feed-dogs for sewing machines
DE2648266A1 (de) * 1975-11-07 1977-05-12 Rockwell Rimoldi Spa Vorschub-einstellvorrichtung fuer naehmaschinen
FR2330794A1 (fr) * 1975-11-07 1977-06-03 Rockwell Rimoldi Spa Dispositif de reglage de l'entrainement du travail sur une machine a coudre

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Publication number Publication date
USRE24005E (en) 1955-05-17
GB705829A (en) 1954-03-17
FR1069100A (fr) 1954-07-05
CH316699A (de) 1956-10-31
DE1026601B (de) 1958-03-20

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