US2453072A - Adjustable eccentric - Google Patents

Adjustable eccentric Download PDF

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Publication number
US2453072A
US2453072A US743583A US74358347A US2453072A US 2453072 A US2453072 A US 2453072A US 743583 A US743583 A US 743583A US 74358347 A US74358347 A US 74358347A US 2453072 A US2453072 A US 2453072A
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US
United States
Prior art keywords
shaft
cylindrical element
eccentric
rotation
inner cylindrical
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
US743583A
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English (en)
Inventor
Ralph E Johnson
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 FR954651D priority Critical patent/FR954651A/fr
Application filed by Singer Co filed Critical Singer Co
Priority to US743583A priority patent/US2453072A/en
Priority to GB19225/47A priority patent/GB659995A/en
Priority to CH260548D priority patent/CH260548A/de
Application granted granted Critical
Publication of US2453072A publication Critical patent/US2453072A/en
Priority to AT169009D priority patent/AT169009B/de
Priority to DEP30255D priority patent/DE864033C/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/22—Cranks; Eccentrics
    • F16C3/28—Adjustable cranks or eccentrics
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/22—Work-feeding means with means for setting length of stitch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2340/00—Apparatus for treating textiles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/211—Eccentric
    • Y10T74/2114—Adjustable
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/211—Eccentric
    • Y10T74/2114—Adjustable
    • Y10T74/2115—Radially

Definitions

  • This invention relates tosewing machines
  • an adjustable eccentric device adaptable for actuating the feed-dog of a sewing machine in its work-advancing movements which must be variable in magnitude to produce stitches of any length within a given range.
  • the illustrated eccentric device is adjustable to produce eccentric motions of any magnitude within a limited range.
  • An eccentric motion is, by definition, that motion which is producedby rotating a circular element about an axis whose center is not the geometrical center ofthe circular element.
  • To vary the magnitude of eccentric motions it follows that it is necessary only to vary the radial or linear distance between the center of rotation and the geometrical centerof the circular element. It is possible also to shift this center of rotation, otherwise called the point of eccentricity, angularly, i. e., circumferentially with respect to the geometrical center.
  • This angular displacement of the point of eccentricity in the case of, an eccentric which actuates the feed-dog of a sewing machine in its work-advancing movements, varies the timing of that movement with respect to the other sewing machine elements.
  • angular displacement of the point of eccentricity causes the work-advancing motion of the feed-do to begin and to end at diiferent times in the stitch-forming cycle.
  • the radial displacement varies the linear distance between the center of rotation and the geometrical center, hence varying the magnitude of the work-advancing movement of the feed-dog.
  • the present invention involves an adjutable eccentric device in which. by means of a unitary adjustment, the point of eccentricity may be shifted both angularly and radially in preestablished ratios, thereby varying simultaneously both the magnitude and timing of the workadvancing movement of the feed-dog.
  • an adjustable eccentric of the illustrated type in which the angular component of displacement of the point of eccentricity is entirelyeliminated.
  • Fig. 1 is a vertical section taken through the lon axis of a sewing machine in which the invention has been incorporated.
  • Fig. 2 is a bottom viewof the sewing machine.
  • Fig. 3 is a left end view of 'thebed portion of Claims. (01. 74-571 the machine, with the hroat-plate sectioned to expose the feed-dog.
  • Fig. ⁇ l is a vertical section taken substantially along the line fll of Fig. 1. i
  • Fig. 5 is an enlarged longitudinal sectional viewof an adjustable eccentric device embodying the present invention.
  • Fig. 6 is a section taken along the line 6-43 of Fig. 5, and shows in full line the eccentric in its maximum eccentricity setting, and insuperirnposed broken lines, the minimum eccentricity setting.
  • Fig. 7 is an exploded perspective view showing the component parts of the adjustable eccentric unit.
  • Fig. 8 is an enlarged sectional View of the eccentric taken along the line 88 of Fig. 5.
  • Figs. 9, 10, 11 and 12 arediagrams showingthe relative angular positions of the adjusting elements of the eccentric for four typical stitchlength settings in the available range.
  • a sewing machine comprising a bed 20 from one end of which rises a hollow standard 2
  • a main or arm shaft 2 one end of which. carries a combined belt and ba1ance-whee1 25, the other end of which carries a crank-disk 26.
  • a connectinglink 2! Pivotally secured to the crank-disk 26 is a connectinglink 2! which drives a needle-bar 28 carrying aneyepointed needle 29.
  • a thread take-up arm 30 is also actuated from the crankdisk 26 by means of a suitable linkage.
  • a spring-depressed presser-bar 32, carrying presser-foot33, is operatively supported in the head 23 in a usual manner.
  • Cooperating with theneedle in the formation of stitches is the loop-taker L, secured upon a shaft 35 and driven by the main shaft 24 through a usual linkage.
  • a feed-dog 3 cooperates with the presser-foot 33 to advance the material.
  • the feed-dog is mounted on a feed-bar 36 (Fig. 3) which is pivotally supported at one of its ends by an up standing arm 3?, and at its other end by a sub stantially horizontal arm 38.
  • the horizontal arm 38 is secured to a rock-shaft 39 which is mounted in the bed 20 by means of pintle bearings 40 and il. Adjacent the bearing All, the rock-shaft so is provided with an arm :12 which,
  • this horizontal movement causes the feed-dog 34 to trace a substantially elliptical path. It is apparent that varying the eccentricity of the eccentric device E will vary the magnitude of the horizontal movement of the feed-dog 34, thereby changing the stitch length.
  • the adjustable eccentric device E comprises a driving disk or collar 56 rigidly secured to the rotary arm shaft 24 by a set screw 5
  • a channel 52 in the driving disk 50 slidably receives a tongue portion 53 of an elliptical connecting link 54 which accommodates the rotary armshaft 2 4 by means of an elongated slot 55 which limits the sliding movement of the elliptical connecting link 54 in the channel 52.
  • a cylindrical element 56 is rotatably mounted upon the shaft 24 by means of an eccentrically disposed aperture 51.
  • An oil groove 58 is provided in the surface of the cylinder 56 to conduct lubricant to the working elements of the eccentric.
  • outer cylindrical element 59 is provided with an eccentrically disposed aperture 66 by means of which it is rotatably mounted upon the inner
  • in the aperture 60 of the cylinder 59 provides an assembling clearance for a pivot-pin 62 which is carried by the cylinder 56 and which protrudes beyond the periphery thereof. In its assembled position a portion of the pin 62 overhangs the face .63 of the cylinder 59.
  • a slide-block 64 is provided with a hole 65 by means of which it is mounted on the pin 52. In their assembled positions, the pin 62, the slide-block 64 and a driving pin 66, which is made integrally with the cylinder 59, all lie in the plane of the elliptical connecting link 54.
  • This member is provided with slots 61 and 68 which receive, respectively, the driving pin 66 and the slide-block 64.
  • a spring 19 (Fig. 8) securedto the flange 69 by a screw 19', biases the slidable locking-plate H so that its teeth 13 engage the teeth 14 of the disk i5.
  • Two arcuate ribs 80 projecting from one face of the flange 69, serve as bearings to position the toothed -disk 75.. r-Fona'rmore complete disclosure of a similar construction including the flange 69, the slidable locking-plate H, and the toothed disk l5, reference may be had to the U. S, patent of R. Kaier, No. 2,161,579.
  • the flange portion 69 formed with a channel 10 which receives a slidable locking-plate H.
  • This locking-plate is formed with a struck out portion 12 which is provided with teeth 13 adapted to engage the peripheral teeth M of a disk 15 mounted
  • the pin H is anchored inJthe cylindrical element 56 from the shaft 24.
  • the locking-plate in is thereby locked to the frame of the sew ng machine. Consequently, the inner cylindrical element 56 :is effectively locked to the frame of the machine since the locking-plate ll iscrecessed in the channel 16 of the flange portion 69 ofthe inner: cylindrical element.
  • the shaft '24 may 'be rotated a limited amount relatively to the innerccylindrical element 56.
  • Relative rotation is also set up :between the shaft 24 and the outer cylindrical element 59 by means of a motion-modifying driving connection therebetween.
  • 'The' adjusting rotation of the shaft 24 is imparted directly to the ellipticalconnecting link 54 by means of the dri ving disk 56 which a'ccommodates'the elliptical member in the channel 52.
  • This rotation of the elliptical member is, in turn,'transmitted to the outer cylindrical element 59 through the driving pin 66.
  • the elliptical connecting link '54 slides laterally in the channel 52. This sliding movement imparts additional rotation to the cylindrical element 59 through the driving pin 66.
  • the sliding movement is caused by the fact that the elliptical connecting'link 54 is constrained by the slide-block 64 mounted on the pin 62 which is integral with the stationary, inner cylinder element 56. Because the'pin'62 is secured against rotation, the elliptical member 54, when rotated by the driving-disk 5 6,is forced to pivot about'the pin 62. In order to pivot about the pin 62, which isspaced from the center of rotation of the shaft 24, the elliptical member must necessarily shift laterally inthe channel 52. Thus the outer cylindrical element 59 is caused to rotate byan amount equal to the angular rotation of the shaft 25 plus that rotation *which-iscaused by the sliding movement of the ⁇ elliptical connecting link 54.
  • Fig. 9 shows the relative angular positions of the elements at zero eccentricity. This setting corresponds to a stitch length of zero in which no work advancing motion is imparted to the feed-dog.
  • Figs. 10 and 11 show the relative positions of the elements for providing approximately twenty-two and fourteen stitches per inch, respectively.
  • Fig. 12 shows the relative positions for the maximum eccentricity attainable by the illustrated device, which corresponds to approximately five and onehalf stitches per inch in the illustrated machine.
  • the centers of rotation z and 0 have significance only during adjustmcntof the eccentric device, since thedriving operation of the eccentric is performed with the three elements 24, 56 and 59 locked together to form a unitary structure whose center of rotation is the center 3 of the actuating shaft 24.
  • the eccentricity of a circular element is by definition the linear distance between its center of rotation and its geometrical center.
  • the distance 8-2 is thejeccentricity of the inner cylindrical element 56, with respect to the shaft 24.
  • the distance i-o is the eccentricity of the outer cylindrical element 59 with respect to the inner cylindrical element 56.
  • the vectorial sum of these distances is s,fo, which represents the resultant or total eccentricity of the adjustable eccentric unit.
  • h represents the high-point of the outer cylindrical element 59, hi the high-point of the inner cylindrical element 56, and H the resultant highpoint of the two combined eccentricities, found by extending the resultant line so.
  • This angular displacement represents a change in the timing of the work-advancing component of the feed-dog motion for the reason that all of the sewing machine mechanism, except that which i is concerned with the work-advancing movement of the feed-dog, has been displaced inproportion to the twenty-two degrees of rotation of the arm shaft 24, while the feed-dog has been displaced inproportion to the sixteen degrees of rotation of the high point H.
  • justingmechanism for said eccentric unit comprising motion-modifying driving linkage operatively associatedwith said cylindrical elements.
  • a sewing machine having a frame, a shaft rotatably mounted in said frame,.and mechanism adapted to beactuated by said shaft; an eccentric unit mounted upon said shaft comprising an inner cylindrical element eccentricall apertured and thereby rotatably mounted upon the said.
  • a sewing machine having a frame, an actuating shaft rotatably mounted in said frame, and mechanism adapted to be actuated by said shaft; an adjustable eccentric unit mounted on said actuating shaft and comprising, a rotatable inner cylindrical element eccentricallyv apertured to accommodate said actuating shaft, a rotatable outer cylindrical element eccentric'ally apertured to accommodate said inner cylindrical element, and unitary adjusting means comprising motionmodifying drivin connections for effecting relative angular rotation between the said shaft, inner cylindrical element, and outer cylindrical element, in which the shaft is rotated an absolute angular distance exceeding that of...the inner cylindrical element, and the outer cylindrical element is rotated an absolute angular. distanceexceeding that of the shaft plus that rotation of the outer cylindrical element which is caused by, the fixed eccentricity of the. inner cylindrical element with respect to the shaft.
  • a sewing machine having a frame; a shaft rotatably mounted in said frame, and mechanism adapted to be actuated by .said shaft; an adjustable eccentric unit mounted upon said shaft, comprising an inner cylindrical element eccentrically apertured to accommodate the said shaft, ,an outer cylindrical element eccentrically apertured to accommodate said innerv cylindrical element, and adjusting mechanism for said eccentric unit comprising a motion-modifying driving connection between the said shaft and theoutercylin- 8 meals-element 101": establishing rotatiozr dhereba. tween by an amount differing .fronrithatzcaused byztheifixed eccentricity of the :innerrcyiindiical element with respect :to: thewshaft.
  • .lnasewin imachine having a, frame, ashaft rotatably; mounted in .'-said :frame; and mechanism adaptedito-be actuated l y-said shaft; ran adjustable eccentric unit -c om prising-an innericylindri'cal element eccentrically 'aperturecl and rotatably mounted thereby-31min said.
  • shaftgan eouter -;cylindrical. element eocentrieally :apertured and rotatably mounted thereby-upon the saidinner cylindr-i'cal element, :and unitaryadlusting mechanism, for :said eccentric. comprising -.a motionmodifying driving connection between the-said shaft and the said inner cylindrical; element.
  • said, shaft an outer cylindrical element ieccentrically apertured to accommodate said inner cylindrical .element, releasable means for locking .oneof said cylindrical elements to said frame, and a unitaryrmeans for adjusting saideccentric unit comprising a motion-modifying driving connection between the other of said cylindrical elements and the, said shaft.
  • an adjustableeccentric unit comprising an inner cylindrical element eccentrically. apertured and rotatably mounted thereby upon said shaft, an outer cylindrical element eccentrically aperturedand rotatably. mounted thereby upon the ,said inner'cylindrical element, a collar mounted upon said shaft, a pin eccentricallydisposed with respect to the said shaft, a connecting, link slidably mounted in said collar and pivotally constrained by said pin, and an operative driving connection between said link and said outer cylindrical element.
  • an adjustable eccentric unit comprising an inner cylindrical element eccentrically apertured parallel to its center-line and rotatably, mounted thereby upon the..sa id..shaft,,an outer cylindrical. element eccentrically apertured parallel to its center-line androtatably mounted thereby upon said inner cylindrical element, a collar mounted upon said shaft, a pin eccentricallydisposed with respectto the center of sa'idshaft, aconnecting link slid ably mounted in said. collar and pivotally constrained by, saidpin, ,and an operative driving connection between said link and said inner cylindrical element.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US743583A 1947-04-24 1947-04-24 Adjustable eccentric Expired - Lifetime US2453072A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR954651D FR954651A (enrdf_load_html_response) 1947-04-24
US743583A US2453072A (en) 1947-04-24 1947-04-24 Adjustable eccentric
GB19225/47A GB659995A (en) 1947-04-24 1947-07-18 Improvements in or relating to sewing machines
CH260548D CH260548A (de) 1947-04-24 1947-09-15 Nähmaschine mit verstellbarem Exzenterantrieb für den Stoffvorschub-Mechanismus.
AT169009D AT169009B (de) 1947-04-24 1948-11-10 Einstellbare Exzentervorrichtung für Nähmaschinen
DEP30255D DE864033C (de) 1947-04-24 1949-01-01 Einstellbare Exzentervorrichtung fuer Naehmaschinen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US743583A US2453072A (en) 1947-04-24 1947-04-24 Adjustable eccentric
GB19225/47A GB659995A (en) 1947-04-24 1947-07-18 Improvements in or relating to sewing machines

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US2453072A true US2453072A (en) 1948-11-02

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US743583A Expired - Lifetime US2453072A (en) 1947-04-24 1947-04-24 Adjustable eccentric

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AT (1) AT169009B (enrdf_load_html_response)
CH (1) CH260548A (enrdf_load_html_response)
DE (1) DE864033C (enrdf_load_html_response)
FR (1) FR954651A (enrdf_load_html_response)
GB (1) GB659995A (enrdf_load_html_response)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2603173A (en) * 1948-03-31 1952-07-15 Olleo & Sons Machine Company R Sewing machine
US2643625A (en) * 1950-03-21 1953-06-30 Union Special Machine Co Work feeding mechanism for sewing machines
US2718860A (en) * 1950-03-21 1955-09-27 Union Special Machine Co Sewing machines
US2790405A (en) * 1952-02-27 1957-04-30 Singer Mfg Co Trimmer mechanisms for sewing machines
US2931329A (en) * 1957-04-12 1960-04-05 Singer Mfg Co Work feeding mechanisms for sewing machines
US2958301A (en) * 1958-02-12 1960-11-01 Medynski Joseph Mecktie centralizing stitching machine
US3216277A (en) * 1963-04-22 1965-11-09 Alvin F Groll Crank throw adjusting means
US4159655A (en) * 1977-12-29 1979-07-03 Preston Engravers, Inc. Adjustable eccentric
DE3317581A1 (de) * 1982-05-17 1983-11-17 Rockwell-Rimoldi S.p.A., Olcella, Milano Sticheinstellvorrichtung fuer naehmaschinen
US5320053A (en) * 1991-09-30 1994-06-14 Tuftco Corp. Demountable rotary cam for tufting machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5056444A (en) * 1990-08-29 1991-10-15 Melco Industries, Inc. Method and apparatus for automatically steering and adjusting the height of a needle in a chenille type embroidery machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1605937A (en) * 1925-11-13 1926-11-09 Singer Mfg Co Sewing-machine-feed regulator
US1956447A (en) * 1933-10-18 1934-04-24 Laessker Fritz Mechanical infinitive variable speed transmission
US2161579A (en) * 1938-04-23 1939-06-06 Singer Mfg Co Adjustable eccentric for sewing machines
US2270816A (en) * 1937-12-07 1942-01-20 Singer Mfg Co Adjustable eccentric

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1605937A (en) * 1925-11-13 1926-11-09 Singer Mfg Co Sewing-machine-feed regulator
US1956447A (en) * 1933-10-18 1934-04-24 Laessker Fritz Mechanical infinitive variable speed transmission
US2270816A (en) * 1937-12-07 1942-01-20 Singer Mfg Co Adjustable eccentric
US2161579A (en) * 1938-04-23 1939-06-06 Singer Mfg Co Adjustable eccentric for sewing machines

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2603173A (en) * 1948-03-31 1952-07-15 Olleo & Sons Machine Company R Sewing machine
US2643625A (en) * 1950-03-21 1953-06-30 Union Special Machine Co Work feeding mechanism for sewing machines
US2718860A (en) * 1950-03-21 1955-09-27 Union Special Machine Co Sewing machines
US2790405A (en) * 1952-02-27 1957-04-30 Singer Mfg Co Trimmer mechanisms for sewing machines
US2931329A (en) * 1957-04-12 1960-04-05 Singer Mfg Co Work feeding mechanisms for sewing machines
US2958301A (en) * 1958-02-12 1960-11-01 Medynski Joseph Mecktie centralizing stitching machine
US3216277A (en) * 1963-04-22 1965-11-09 Alvin F Groll Crank throw adjusting means
US4159655A (en) * 1977-12-29 1979-07-03 Preston Engravers, Inc. Adjustable eccentric
DE3317581A1 (de) * 1982-05-17 1983-11-17 Rockwell-Rimoldi S.p.A., Olcella, Milano Sticheinstellvorrichtung fuer naehmaschinen
US5320053A (en) * 1991-09-30 1994-06-14 Tuftco Corp. Demountable rotary cam for tufting machine

Also Published As

Publication number Publication date
AT169009B (de) 1951-10-10
DE864033C (de) 1953-01-22
FR954651A (enrdf_load_html_response) 1950-01-04
CH260548A (de) 1949-03-31
GB659995A (en) 1951-10-31

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