US2494006A - Clutch mechanism for sewing machines - Google Patents

Clutch mechanism for sewing machines Download PDF

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Publication number
US2494006A
US2494006A US700480A US70048046A US2494006A US 2494006 A US2494006 A US 2494006A US 700480 A US700480 A US 700480A US 70048046 A US70048046 A US 70048046A US 2494006 A US2494006 A US 2494006A
Authority
US
United States
Prior art keywords
clutch
barrel
shaft
block
hub
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
US700480A
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English (en)
Inventor
Schoij Edgar
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.)
Union Special Machine Co
Original Assignee
Union Special Machine 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 Union Special Machine Co filed Critical Union Special Machine Co
Priority to US700480A priority Critical patent/US2494006A/en
Application granted granted Critical
Publication of US2494006A publication Critical patent/US2494006A/en
Priority to DEU451A priority patent/DE843955C/de
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
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D05B27/18—Feed cups
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/06—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface
    • F16D41/064—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls
    • F16D41/066—Freewheels or freewheel clutches with intermediate wedging coupling members between an inner and an outer surface the intermediate members wedging by rolling and having a circular cross-section, e.g. balls all members having the same size and only one of the two surfaces being cylindrical
    • 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
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1558—Grip units and features

Definitions

  • An object of the invention is to provide an intermittently operating clutch mechanism of lthe above type wherein the gripping surface fof the clutch barrel is eccentric to its axis of rotation so that theV gripping line between the roller and the clutch block shifts back and forth on the clutch block for each rotation of the shaft and wherein the gripping face i the clutch block is so shaped that the wedge angle between the clutch barrel and the clutch block remains sub'- stantially constant as the gripping lines shift.
  • a further object of the invention is to provide a clutch mechanism of the above type wherein means is provided for changing the eccentricity of the clutch barrel so that the area over which the grip shifts may be increased or decreased to further distribute the wear and increase the life and efficiency of the clutch.
  • Figure l is a View partly in side elevation with parts broken away to show some of the inner mechanism and with parts in vertical section,
  • Figure 2 is a vertical sectional View through a portion of the machine and showing the means whereby access may be had to the clutch mechanism for varying the eccentricity of the setting of the clutch barrel on the actuated feed shaft,
  • Figure 3 is a front view of a portion of the housing for the clutch mechanism showing the cap screw removed from the opening and the indicia on the clutch barrel for indicating the relative amount of eccentricity
  • Figure 5 is a section on line 5 5 of Figure 4,
  • FIG. 5 is a sectional View taken on the line 6 5 of Figure 4,
  • Figure 8 is a' sectional view on the line 8--8 of Figure fi,
  • Figure 9' is a diagrammatic view showing the f 7 Claims. (Cl'. 'I4- 144) in f '2 angle between theinnei surfaceof'the clutc Ybarrel and the gripping-surface of the clutch block is substantially 'equal for eachincremen't of rotation of thev clutch' barrel, n
  • Figure 10 isa diagrammatic view showing the shifting ofthe setting of 'theclutch barrel'from zero where the inner surface of the clutch barrel is concentric tothe axis'of the actuated shaft to maximum eccentricity 'of the clutch barrel relative to the axis of said shaft.
  • the machine ⁇ includes a 'housing orv frame Iin Whichis mounted the main 'actuating shaft ⁇ 2; - ⁇ Said housing is provided with an overhanging portion 3xsupporting: an inner feed cup 4 andan outer feedv cup 5 between which the fabric; sections are gripped and fed through the stitching -mechanism.
  • the stitch ing' mechanismv includes a needlev' which is'Y 'carriedby a needlefbarreciprocated bysuitable mechanism ⁇ from-the main vshaft 2.
  • the feed cup 4 is carried by a shaft!) mounted for rotation in a sleeve I0 which in turn is fixed to the frame lofthe machine.
  • the feed cup 5 is carried by a shaft-II which is connected through a universal'joint with a'shaft I2 mounted in a suitable bearing inV the ⁇ -overhanging arm 3.
  • a -gear wheel I3 'carried-'by 'ahub I4 which is secured to a flat section I5y onthe actuated shaft by means of a set screw I6.
  • Thegear I3 meshes with agear I1 on the shaft I2v and thusrotationsv imparted to the shaft '9 arealsof-impalrted'to the'shaft II; thereby the feed cups are operated in unison and ,turned incrementi'byf'increment for'feeding the fabric to the stitching mechanism.
  • Therpurpose parts one of which is the actuating part for turn- Y ing the shaft 9, and the other is the holding 'or braking clutch for holding the shaft when turned moved in a clockwise direction and releasing the to a set position and preventing retrograded.
  • the clutch mechanism includes a sleeve I8 to whichtheclutch -bar.
  • rel I9 of the actuating clutch part is integrally connected.
  • the clutch barrel 20 of the Vbraking clutch is also integrally connected with this sleeve.
  • theA actuating isha-ft .9 is fa -fhub -2
  • Asshown in Figure -8 :there:are three 4set screws, one of 4which is' indicated at: 23;', another at 24, and another-at 25..
  • the sleeve may be adjusted on this eccentric ihub so as to position any one of the three set screws directly over theflat section. isfor the pur- :pose of 'changing ⁇ theeccentric#setting of the clutchbarrels' on thek shaft y9,1'as ywill be more fully Aexplained hereinafter:
  • the vclutch block has :three :wedging "faces which vare all similar Vin shape and :are:numberedV28; ⁇ 'Dis- 1 posed between each operating face' ofthe clutch Y hlockand the inner surface .29ffof1theclutdh barrel i9 lis 1a roller30. 'Thecperating surfaces .of
  • the clutch block 2282 are eccentric 'to the inner surface of the clutchbarrel 'and ⁇ the roIlersare -fso ⁇ dirnensioned Athat they lwill' 'be-ffrictionally' :gripped by theV l'clutchblock :and ⁇ pressed *into frictional gripping engagement 'with the inner face of the :carrying a lbamlfstud -341to' whicha ⁇ link 35 is con- .nected .This'lli'nk 5351's connectedlatits'othervend :to aslotted 'arm-fmounted on arenariaY 31 AThe carries .-anarm :38 '.to'which isrionnected Yan eccentric'- strap-' 9 cooperating :with an i eccentric 4U zionntlre 4'main :shaft': ias #the :main shaft lrotates ithisneccentr'ic,,will-:
  • the clutching mechanism which serves to hold the shaft I9 in a set position is similar to the clutch mechanism for actuating the lshaft except that the clutch block 4IV is i'lxed to the sleeve l0 which in turn is fixed to the frame and held from :mo-vement.
  • has the similarly shaped clutching faces 42 which engage rollers '43 ⁇ and force the same into gripping contact with the clutch barrel 29.
  • the clutch barrel will be turned by. the actuating clutch block through ⁇ a given increment of movement and,
  • compression springs 44 mounted on studs car- Vried y'by pests L15 'which are rigidly ati'laclfiedk tothe sleeve i@ and therefore these posts and springs are Vstationary the same as the clut'cl'i.y block 4I.
  • the .clutch .plate 25a is provided with an annular groove or channel 46 inthe upper face thereof. Oil may be supplied to this channel through openings 41' in the gear I3. There are cil holes 48 through the clutch plate 25a which are disposed between the posts 32 and the Arollers Yfor reciprocating .the clutch.
  • the circle indicated at X is the circumference of the shaft Yand the center of the :shaft is ,indicated at 'cs'.
  • The. circle Z indicates the circumference vof the .hub and the ,center of the hub as shown in this View it at ch.
  • the center of the inner surface of the clutch barrel, which is not indicated in this view, t' is shown ⁇ at cb. When the centers cs, ch and Vcb are in alignment, then'the clutch barrel is at its vmaximum eccentricity.
  • the distance from the center of the shaft to the center of the hub vis .005 'inch andthe distance from the center of the hub to the center 'ofi the barrel is .005inch so that when the centers are in the position shown in this diagram, the eccentricity of the barrel lis .O10 vinch from the center of the shaft.
  • the set screw'25 is shown on this diagram and lindicates ythe setting of the clutch barrel on the hub when the flat on the hub hasibeen brought opposite the set screw 25.
  • the eccentricity of the clutch ,bar-i rel is as noted .010 inch.
  • the set screws may beaccessible-by removing Vthe cap plate of the machine, but prefereably the vhousing has an opening 49 at the-front thereof.
  • indexing numeral 1 is applied to the outer face of the clutch barrel oppositey the set screw ',ing of the feed cup prevents the flat from shifting.
  • the set screw 24 is then tightened.
  • lThe other ⁇ set screw may also be tightened against the hub to aid in holding the clutch drum in a set position on the hub.
  • the'eccentrivcity may be further adjusted by shifting the clutch drum to bring the set screwv 25 opposite Ythe at. It is noted that the flatr l5 at thev upper end of the shaft, the flat 22 on the hub, and the flat 4a which is contacted with by a set screw 4b to lock the feed cup -to the shaft are all in alignment. This greatly facilitates the assembling o'f the parts.
  • the gripping surface of the clutch barrel when the eccentricity is down is indicated'at 29h.
  • the position of the roller when the eccentricity is up is indicated at 3l)a and itv will Ygrip the surface 2i)a of the clutch barrel at S and the clutch block at A.
  • the roller shifts to the position 39h so that it grips the clutch barrel surface 2lib at S and the clutch block at A'.
  • the line of grip ⁇ of the roller and the clutch block shifts from A to A' during the rotation ofthe 'clutch barrel through 180 degrees and through the next rotation of y180 degrees the line of grip will shift back ⁇ from A to A.
  • the surface is to'provide a substantially conv 'and the clutch barrel shifted until the screw 24 is 6 stant wedge angle for all positions in which the roller is gripped by the ⁇ clutch block.
  • the wedge angle is the angle between a line tangent to the roller at the point of contact S ⁇ between'the roller and the clutch barrel and a line tangent to the roller at the point .of contact A ofthe roller with the curved surface 28.
  • a wedge angle is selected with the clutch barrel at maximum ec'- centricity and the roller at the position 30a, which wedge angle will prevent slippage, and the curvature of the clutch block face is so shaped that the wedge angles for each gripping position 'of the roller as it shifts back and 'forth on the face of the clutch-block will be substantially equal regardless of where the gripping of the roller by the clutch blockv occurs.
  • the center of the curved surface 28 is determined bydropping a line from the center O 'of the roller through the point of contact A, and where this lineintersects a line drawn at right angles thereto and passing through the center Cof the shaft determines the center'ofthe curved surface of the block. This center is indicated at D.
  • the angle between O-D and O'-C equals the wedge angle for the roller in the position 3i)a and likewise the angle between O1'D and O'-C equals the wedge angle for the roller at the position 30h.
  • These wedge angles are substantially equal and likewise the wedges angles for all gripping points are substantially equal.
  • the machine is equipped as above noted with Vmeans whereby the eccentric setting of the clutch barrel may be varied by loosening the screws securing the clutch barrel to the hub and shifting the same on the eccentrichub.
  • the machine is preferably adjusted at the factory so that the Screw 23 is in contact with the flat and this pro- 'vides for an eccentricity o'f .004 inch. -When the machine has been operated for some time and wear occurs, then the set screw 23 is loosened opposite the flat. This increases the eccentricity of the setting of the clutch barrel and it will alsoincrease the distance between A and A', vthe limits ofthe area where the roller grips the clutch block, and bring new surfaces into contact with the roller.
  • the set screw 24 can be loosened and the screw 25 brought opposite the flat and this will increase the eccentricity of .010 inch and it will also further increase the distance from A to A over which the line of contact between the roller and the clutch block shifts.
  • the area of the line of contact is increased from the original setting and thus the wear and life of the clutch are prolonged.
  • the wedge angles for all setting will be substantially constant. This not only permits a greater range of adjustment of theeccentricity, but it also prolonge the life of the clutch before wear can possibly change the wedge angle sufficiently to bring about slippage.
  • rollers Vinstead of the rollersV .ballsv might .be used. Itis preferred, however, ato use. rollers,as the-contact between the rollers. and the partssd'irectly This rclutch block .being curved supplementhat the wedge angle is substantially constant for all gripping positions ⁇ of the rollers.'
  • a 4v@hitchnieclfianism for sewing machines x comprising an actuatedshaft, a clutch barrel on said shaft, a clutch block-'associated with said barrel, gripping rollers between the clutch block positions of the rollers.
  • a clutch mechanism for 4 comprising an :actuated .fshafaa hub on Asaid shaft, vthe center of which 'is eccentric "to :the
  • a .clutch mechanism for sewing machines comprising ⁇ an Aactuated: shaft, a ⁇ hub on .said shaft, thecenter ofrwhfic'h' is -eccentricto the center of the shaft, a sleeve on said hub, a driving clutch barrel and a Abraking.clutch barrel carried. by said.
  • a clutch Irneclflanismy for'iseWi-ng.' machines comprising an actuated shaft', a hubron' 'said shaft, the center .of which is .eccentricv tofthe center ⁇ of the shaft, y ⁇ a :sleeve ⁇ on ⁇ said hub', .adrivving l'clutch' barrel.V and Aa braking vclutch .barrel carried' by said sleeve, the clutching surface of each barrel being/'eccentric to the center l'oi-the hub, a clutch block vassociated with reach barrel, means for holding one .of'said clutchblo'clrs stationary and :means for actuating the other clutch block, rollers associated with each clutch block 'for gripping the. clutch barrels, a .compression spring associatedwith each-roller and normally ⁇ .tending to Vhold' the roller in clutching engagementwiththe. clutch blocks andclutch barrels
  • A. clutch ⁇ mechanism'.forsewing machines comprising an actuatedlshaft'a hub onv said-shaft,
  • a clutch mechanism for sewing machines comprising an actuated shaft, a hub on said shaft, the center of which is eccentric to the center of the shaft, a clutch barrel mounted on said hub, the center of the clutch barrel being eccentric to the center of the hub, a clutch block associated with said barrel, gripping rollers between the clutch block and said barrel, the clutching faces of each clutch block being curved so that the wedge angle is substantially constant for all positions of the rollers, means for oscillating the clutch block for moving the barrel intermittently,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US700480A 1946-10-01 1946-10-01 Clutch mechanism for sewing machines Expired - Lifetime US2494006A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US700480A US2494006A (en) 1946-10-01 1946-10-01 Clutch mechanism for sewing machines
DEU451A DE843955C (de) 1946-10-01 1950-07-15 Antriebseinrichtung fuer schrittweisen Vorschub bei umlaufenden Vorschubeinrichtungen an Naehmaschinen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US700480A US2494006A (en) 1946-10-01 1946-10-01 Clutch mechanism for sewing machines

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US2494006A true US2494006A (en) 1950-01-10

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DE (1) DE843955C (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633951A (en) * 1950-10-03 1953-04-07 High Prec Inc Roller type overrunning clutch
US2777409A (en) * 1954-03-17 1957-01-15 Ragnar W Winberg Feed means for sewing machines
US2962988A (en) * 1957-08-29 1960-12-06 Alba Hosiery Mills Inc Apparatus for feeding elastic material to sewing machines
EP1167801A1 (de) * 2000-06-30 2002-01-02 Nippo Ltd. Einwegkupplungen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1092520B (it) * 1978-01-20 1985-07-12 Rockwell Rimoldi Spa Dispositivo perfezionato di avanzamento a rulli controrotanti

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190206632A (en) * 1902-03-18 1902-05-01 William Phillips Thompson Improvements in Apparatus or Instruments for Imparting Rotary Motion to the Axles or Shafts of Toys and the like.
US1222712A (en) * 1917-01-02 1917-04-17 Interstate Machine Products Company Inc Mechanical movement.
US1292099A (en) * 1914-01-06 1919-01-21 Union Special Machine Co Feeding mechanism for sewing-machines.
US2265222A (en) * 1940-07-31 1941-12-09 Addressograph Multigraph Machine for preparing control devices
US2360075A (en) * 1942-06-09 1944-10-10 Union Special Machine Co Sewing machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190206632A (en) * 1902-03-18 1902-05-01 William Phillips Thompson Improvements in Apparatus or Instruments for Imparting Rotary Motion to the Axles or Shafts of Toys and the like.
US1292099A (en) * 1914-01-06 1919-01-21 Union Special Machine Co Feeding mechanism for sewing-machines.
US1222712A (en) * 1917-01-02 1917-04-17 Interstate Machine Products Company Inc Mechanical movement.
US2265222A (en) * 1940-07-31 1941-12-09 Addressograph Multigraph Machine for preparing control devices
US2360075A (en) * 1942-06-09 1944-10-10 Union Special Machine Co Sewing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2633951A (en) * 1950-10-03 1953-04-07 High Prec Inc Roller type overrunning clutch
US2777409A (en) * 1954-03-17 1957-01-15 Ragnar W Winberg Feed means for sewing machines
US2962988A (en) * 1957-08-29 1960-12-06 Alba Hosiery Mills Inc Apparatus for feeding elastic material to sewing machines
EP1167801A1 (de) * 2000-06-30 2002-01-02 Nippo Ltd. Einwegkupplungen

Also Published As

Publication number Publication date
DE843955C (de) 1952-07-14

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