US1289866A - Feeding mechanism for sewing-machines. - Google Patents

Description

l. R. MUFFATT 6:. 8.8. KELSO FEEDING MECHANISM FOR SEWING MACHINES.

APPLiCATlON man vov. 14 1916. i)

' Patented Dec. 01,1918.

6 SHEETS-S'HEEI l.

J. R. MOFFMT 61 13.. S. KELSO.

FEEDING MECHANISM FOR SEWING MACHINES.

APPILICATION FILED NOV. 14A 1916. Patented Dec. 31, 1918.

6 SHEETS-SHEET 2.

. wx aa% Q W I N ,V 1 I J. R. MOFFATT & R. s. KELSO.

F EEDING MECHANISM FOR SEWING MACHINES.

' APPLICATION FILED NOV.14, I916.

89,866. Patented Dec. 31; 1918.

@I IU ,2. m

I WI

H. 8. W180. FEEDING MECHANISM FOR SEWING MACHINES.

R. MOFFAT] &

APPLHIAIIQN FILED NQV, 4, I916- 1 $89,866@ Patented Dec. 31, 1918 6 SHEETS-SHEET 4.

l. H. MOkFATT & R. S KELSO.

FEEDING MECHANISM FOR SEWING MACHINES:

APPLiCATION FILED NOV. 14 1916 q Patented Dec; 01, 1918.

' 6 SHEEIS-SHEET 5. 6 mm. 61

4 J. R. MOFFAU & R. S. KELSO.

FEEDHVG MECHANISM FOR SEWING MACHINES.

APPUCATION FILED NOV. m. I916.

Patented Dec 31,1918.

6SHEETSSHEET 6.

smnss r :1 i. 11

.Yihfl l'illfi Fm IEGEFATT ALI-H3 RALPH; 55 ILSQ, BF CHICAGO, KLLHQ'OIS, ASSIGNORS TO'UN'I JH Q MECHENXISM FOR SEWING-MACEXNES.

specification of Letters Patent.

Application flied November 1 1916. Eerie-1N0. 13L223- e (:55 whom it may concern:

Be iill'iGWH that we, JAMES R. Messiaen? and RAMH S, Knnso oitizens of the Unwed States, residing at Chicago, in the county or it (looin State of Illinois, have invented oer" and useful improvements in Feed; ing Qflohenisin for Sewing-li/ieoinn%, or K which ti: followingis a descript on, rel-en i o" ind to accompanying drew: o the figures of sei'erence marked.

M'LHQCUOYR with the lower feeding mechanism so thiit the adjustments of the lower feedingmozzenism will-also similarly adjus the feeding niovements of the upperfeod object of the invention is to provide a feeding mechanism of the above chsraster wherein the; length of the feeding movement of the upper feed'dog; may be varied relative to the length of the feeding 55 movement of the lower feed do A further object of the invention is to provide a feeding mechanism of the above character wherein the presser footjeoopereting with. the lower feed do is positively so moved up and down in a vertical plane only,

which movements of the presser foot alternet, with the up and down movements of the upper feeding dog, the parts being so I timed. that the foot and dog are never lifted d55- oiif the material at the same time.

A still. further object of the invention is.

to provide means for adjusting the lift of the presser foot so that proper clearance may be obtained.

5% These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

, but showing t id dog is moved back and forth through In the drawings, whieh'show h way of ilhistretion one embodiment of the invention:-

Figure l is a front viei' of sewing m1:- ehino embodying our improvements;

FiguL-Z is a rear view of the some;

Fig. is'an end View with parts away to show the connection of she iower is ig. 5 is view in part similar to 4, he feed dogs as engaging the fabric for their feeding stroke the pressor foot being raised;

5 is s detail in perspective, showing a,

portion of the work support the presser foot, the upper feed dog, and the needle.

I and also a portion of the fahrio guide; and

7 is a detail in section, shoving the means for connecting the feeding mechanism to the iower seed ng. dog, and the means for raising and lowering the upper feed dog and the presses foot.

in carrying out our invention, we have provided a lower feeding mechanism which includes a main food do carried by a feed supporting her which is given the usual movements so as to import forward. and

back and up and down movement to feed do Cooperating with this main feed dog is the upper feed dog or feedin foot and also apresser foot. The upper 'eed dog or feeding foot is connected to a feeding n1eoh anism which positively raises and iowers said upper feed dog and also positively moves-"said upper feed dog back and forth. The means for moving the upper feed dog back and forth is connected to the lower feed baractuating mechanism which moves the main feed dog back and forth. This con- Patented Dee. s11,

neotion includes an adjustment so that the upper feed dogmay he moved in unison with the lower feed dog, or given a longer feeding stroke whereby said upper dog will move at adifferent' speed from the lower feed dog.

When, h0wev'er, this ad'us snent hes been made and the relative reed movements of the feed dogs is determined, they may be adjusted a whole to the length of travel by listing the actuating mechanism for the main feed bar. The upper teed dog is rnised and lowered by a, mechanism which includes positive connections with an eccenon the main shaft, and this mechanism is connected with presser foot so that the prcsser foot is positively raised and lowered; The feed dog becomes an abutment for the raising of the presser foot, and the press-er toot becomes an abutment for the raising of the feed dog f :iieferring more in detail to the drawings,

= we have shown our improvement as applied to a sewing machine having supporting heel .i. carryin an overhanging arm 2 in which a needle bar 3 reciprocates. Said needle bar is provided, as herein shown, with a needle l. The needle bar is reoiprocated by a needle lever 5 which is connected to the needle bar by a link 6, This needle lever is oscillated by an eccentric on themain shaft 7 which coiiperates with an eccentric strap 8 connected to the needle lever. Cooperating with the needle below the work support is a loopcr 9 which 13 OSClllfllLOCl'b V a link 10 which is connected to the needle lever on tension 11. These parts are of the usual construction, and form no part/oi the present invention.

The work support 12 is carried by the supporting bed 1 and this work support has a "feed slot 13 through which the main or lower feed dog H: operates. Said work support is also provided with a slot 15 which receives the needle 4. The material is held on the work support between feeding movements by a prcsser foot 16. lhis presscr foot is carried by a prcsser bar TlT'mountcd to there vcrticallj. only in the work supporting arm Cooperating with the main feed dog 14 is an upper feed dog or -teedimg foot 7 The main food dog 1% is carried by a feed bar 19 which is pivoted at 20 to a feed rocker 21. The feed rocker 21 is clamped to a shaft mounted in suitable bearings 1' and ill. The feed rocker 21 is provided v 1th an arm 25 which is connected to a link 26 at its free end. This link 26 is in turn connected to a crank pin 27 which is adjustaltdy connected to a disk 28 on the end oi the main shaft 7. By adjusting the position or the pin, the throw of the feed rocker 21 may be varied. As this feed rocker oscillates the feed bar 10 is moved back and forth and, therefore, the adjustments of this pin determine the length of the feeding stroke of the main or lower feed dog. The main feed bar 19 is raised and lowered by an eccentric 29 which'is mounted on the main shaft 7. The up n r feed dog 18 clamped to the lower end of a feed bar 30. This feed bar 30 extends generally in a vertical direction. Said bar has a slot 31 at its the upper feed dog or merit of the lower feed dog.

upper end which has slidin engagement with a fulcrum pin-32 threade into the-overhanging arm. This permits the upper end of the bar to move vertically on the fulcrum pin and also to swing about this pin as a pivot point. The feed bar 30 is also provided with an opening 33. A hearing plate 3%, larger than the opening, spans the same and rests against the side face of the feed bar 30. This plate 34 is secured to the overhanging arm by a screw 35, The opening 33 is of sufiicient size so as to permit the feed bar 30 to move up and, down and also to move laterally at this point.

The feed bar 30 is oscillated about the pivot pin 32 by a link 36 which. is pivoted at 37 to the feed bar 30. The link 36 at its other end is pivoted at 38 to :1 depending arm 39 formed integral with or secured to a sleeve $0. This sleeve is mounted so as to oscillate on a shaft ll which in turn is mounted in suitable bearings 42 and l3 carried by the overhanging arm. Said sleeve s0 is oscillated by an arm ll which depends from the sleeve 40. The shaft has an arm 45 clamped thereto, and this arm extends upwardly from the shaft. Said arm 45 is formed with a slot 46, while the arm all is provided with a. slot l7. A link 18 is connected at one end to a pin l9 which is adjustahly mounted in the slot $6. The other end of the link 48 is connected to a pin 50 which is adjustably mounted in the slot 4.7.

As the main feed bar is moved back and forth, the arm l5 will he oscillated, and this through the link 48 will oscillate the sleeve 40 and through the link 36 said sleeve will oscillate the feed bar 30, thus also moving feeding foot back and forth. It will be noted that the connections for operating both the main feed dog and the upper feed dog are positive, so that both roperly set a set position, then the movements of the upper feed dog will be greater than the feeding movements of the lower feed dog, while-if said pins 49 and 50 are moved below suchn set position, then the movements of theupper feed dog will be less than the move Whatever may be the relative feeding movements of the feed dogs broughtabout through these ad just-ments, both of such feeding movements may be simultaneously adjusted by varying the throw of the feed rocker 21 through the shifting of the pin 27 at the end of the main shaft which causes the dsoillations of said rocker. In other words, after having once determined the relative movements of the upper and lower feed dogsthese movements linlrconnoctin the free end of said arm Wlliil'Sfild. feed. 31 and means for oscillating said roclz lever.

2. A sewing machine including in combination a work suppori, an upper fee dog, a vertically disposed feed her carrying said. upper feed dog, means for pivoially sup-- porting said "eed bar at the upper end there of whe cby file same may oscillate and move up and down, means for engaging the feed her between its ends for guiding ifs back and forth and up and down movements, means for moving llic feed bar lu'hn'all fnr giving a feeding mo ement to the feed dog, means for raisingthe feed bar, said lasi;

means including a rock lever having; a substantially horizontal arm, a link connecting said. arm with the feed bar, said linlr being substantially vertical, said reel:

' lever having asubsian'lially vertical arm, a

cross shaft at the rear eff-the; machine, a depending arm carried by the'ai'oss shaft and a link connecting said depending arm on the cross shaft with the vertical arm of the rock lever.

A sewing machine including in combination a Work support, a resser bar, a presser fool: carried thereby, an upper feed clog, a vertically disposed feed bar carrying said upper feed dog, means for pivotally supporting said iced bar at its upper end whereby the same may oscillate and. move up and clowma rock lever fulcrumed on the presser inn and havi'ng a. substantially horizontally extending arm, a vertically arwhereby the same may oscillaie and'rnove, up and down, a rock lever fulcrumcd on the resser bar and havine substantially horizontally extending arm, a vertically all: ranged. link conneciing the outer end of said arm with 'lhe feed ban for raising and lowering the same, a crosn shaftal' the rear of the machine, orossehalt having" a dcwnwarclly extending; ii aii'l rbcl; lever having a substantially verl'lc liarni and as link connecting said veriical arm with the downwardly extending arm on, the cross shaft, a sleeve carried by the cross shaft, means for oscillatingn, the sleeve, :2 :ir'in carried by the eve and a link connecting said depending arm carried by the sleeve with the feed bar for oscillating the same.

ranged link connecting the outer end of.

said arm with the feed bar for raising and loiverii'ig the same, means for oscillaiing the rock lever and means for oscillating the feed bar.

A sewing inachinc including in combination a work suppcrl, a resser bar; a prcsser foot carried thereby, an upper feed dog, a vertically disp'osed feed bar carrying said upper feed dog, means for pivotally supporting said feed bar at its upper end whereby the same may oscillate and move; up ahd down, a rock lever fulcriuncd on the presscr liar and having a substantially horizontally extending arm, vertically arrai'iged link clsnnecting the outer end of said arm with the feed bar for raising and lowering the same, a cross shaft at the rear of (he machine, said cross shaft having a (lOWI1\\H1(ll Y extending arm, said rock lever having a substantially vertical arm and a link connecting said vertical arm with the downwardly extending arm on the cross shaft and means for oscillating the feed bur.

5. A sewing machine im'liulinp, in combination a. work support, a resser bar, a pix-sum loot carried Thereby, an upper food dog, a vcrlicnllv disposed "r'ccd bar carrying said upper feed dog". inc-ans; {or pivolally w sugi mrtuug said i'r-cd hm iii in; upper end dog, inc-ans for suppzn (3. A sewing machine including in combination a Work support. an upper feed dog, a, feed bar carrying; said upper feed do and having an opcninq harmed therein intermediace its ends, a bearing plate having a,

securing member extending through said opening, said bearing plate l'icing of Sullicicnt size to overlap the feed bar, means for guiding the upper end of the feed bar, means for raising and lowering the feed bar and means for moving: the iced bar back and forth.

7. A sewing machine including in combination, an overhanging arm, a work support, an upper feed dog, a vertically disposed feed bar carrying said upper feed (log, said feed bar having an opening formed therein intermediate its ends, a hearing plate for engaging the feed oar adjacent said opening, a screw for securing 'l'ho hearing plate to the overhanging arm, said feed has having a vertical slot atils upper cnclfa fulcrum pin passing through said vertical slot, means for raising and lowering: the feed bar and means for moving the feed bar back and forth.

8. A sewing machine including in combi' nation an overhanging: arm, a work support, an upper feed dog, a vertically arranged feed bar carrying said upper feed dog, means for supporting lhe upper end of the feed bar whereby the feed bar may oscillate and move vertically, moans intermediate the ends of the feed bar for guiding, 'Lhe same as it moves back and forth and up and down, a, cross shaft at the rear Side of the verhang-' ing arm, a depending arm carried by the cross shaft, means "for oscillating said cross shaft, a lever oscillated by said cross shaft, a vertically disposed liulr connected w the end of the lever and to said feed bar for moving the same up and down and means for moving the feed her back and forth.

A sewing mach including in combination, an overlnv'dinq arm, a Work sup port, an upper feed a vertically arranged feed bar carr said upper feed lhe upper end of depending

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