US2048874A - Feed regulating device for sewing machines - Google Patents

Description

July 28, 1936. KUCERA I 2,048,874

FEED REGULATING DEVICE FOR SEWING MACHINES Filed Feb. 5, 1934 3 Sheets-Sheet l J1ly 28, 1936. F. A. KUCERA FEED- REGULATING DEVICE FOR SEWING MACHINES I 3 Sheets-Sheet 2 Filed Feb. 5, 1934 July 28, 1936. F, KUCERA 2,048,874

FEED REGULATING DEVICE FOR SEWING MACHINES Filed Feb 5, 1934 3 Sheets-Sheet 3 Patented July 28, .1936

PATENT *QFHC'E s FEED ."REGULATING DEVICE: FOR

SEWING MACHINES '1 Frank? A.".Kucera, Chicago, 111.; 'assignor to Union SpeciahMachine C'ompanyjChicago} 111., a cor- --poi-a;tion or Illinois Application February 5, 1934;..Serial No; v109,859

" 7 Claims.

..-The: invention relates to: :-new-;-.and r-useful improvements in a, feed regulating device for. sewing machines, and: more 'particularly toga feed r regulating device; which includes a:crank:-.shiftable :radially ofthe: actuating; shaft-.ztherefor .for

-varying the throw-f a.-feed-bar.

.aAn. obi ect of-..thezinventinn is .to provide zmeans whichris-mountedeonand'rotatingewith the shaft, -but1which is.-\capab1e-.of-. adjustmentweccentrically l0 about-theshaft:for -positively shifting the posi- T tion.- rofethe -..crank spin which imparts the :feed s-throw-ytoa.--feed bar.

..A .-further lobjectiof. theinvention is =to=provide means rotatingwith the shaft for indicating the extentzofadjustment and the stitchlengthiwhich is derived from a-.-set.- adjustment.

t In the:drawings Figure ls israrr endwiew of a sewing machine =.having :theimprovements applied' thereto;

x :Fig.=2 a planwiew of .the partseheneath the cloth plate with a section 0f thecloth plate turneda-to open positionasoeasLto. expose: said parts immediatelyr-therebeneath;

.-'. Fig; 3 is a---perspective view :of the regulator 525 -;"cap which-shiftsthecrank-pin. impartingra feed nthrow to :the feed: dog;

frEigx-e is a-face view-ofasaid rregul-atort'cap; Fig; 5.--isa: vertical. sectional view. through the 'I' end;- of the actuating: shaft, 1 the crank :pingthe T39 ..link. associated. therewith. and the regulato-rcap; Fig; 6 is'a-sectional 'view-ion :the line 6'-6 of Fig.5, the actuatinglink- -being omitted;

Fig. 'l' isa face-view -ofathe regulato-recappn anfenlargedcscale; also showing; the crank. and.

15. 5 :the: parts-associated therewith, with the cap set 1 in: ariposition :ior the: maximum :throw- 1 of: the crank;

1'Fig:.s -is-arviewsimilar.to.-Fig. 7,- -zwith the cap shifted so as to bring thecrankrpin.substantially 940 to: aposition ofxminimum' throw;

::Fig.-:9 is'a plan view rofcthe actuating shaft 1.- and; the :partswcarried'thereby :including aiipor- '.:tionof the-=sleeve carried iby the crank pin,- and 10 .isa developmentiof .the peripheral surface of: the: regulator capeshowing the 'gauging groove formed therein Pfon indicating the stitch lengths.

Thesinvention isiapplied .to'- a; sewing machine shavinga feedingwmechanisme'which. includesa 3:50 feedzbarsmovable @back: and forthior imparting ---.a';feed -throw-to. a feeds-dog. 'rTheefeed bar-is connected to a feed rockeizcandwthe feed rocker .CiS lOSCi11abBd-}by= an :arm "which is sconnected :ithrough a :link: to as'crank mounted' fore-radial isszzadjustmentzin -the sloticarried byathe disk on .the

-- endof. the actuating shaft. Associated with. this disk is a regulator cap whichis provided with. a spiral-islet .inthe face. thereof, andwthe v crank -pin:ext'ends through this-slot. .Theslotiscf suchwidth that whenv the regulator capris. shifted, afterrthe. crank pinchas been released,,it.wi1l positively shift said crank pin in the radialslot.

This regulator-caphas grooves-formed therein at proper intervalstoindicate thestitch length which-is produced when the cap-is shiftedto a 10 certain predetermined;=position re1ative...to the actuating, shaft. Fixedwto the actuating. shaft is. a; gauge. finger having. a Y zero settinggroove relative to-which the regulator cap is shifted.

nReferring rmoreqiin detail tovthedrawings, the 15 invention isshownapplied to a-=sewingmachine which includes a supporting ..bed I .carrying ..a

- standard -2 .on which is 'mounted :an overhanging armc-arryinga' needleshead 3. A.,needlebar- 4 is mounted -for.reciprocationin the needle head.,.- 2 0 Saidneedle. bar Acarries arneedle 5. -:Mounted on the-.bed I is a -worktsupportt. Saidwork-support 6 is. provided-with a section I- =(see.Fig.= .2') -which-ismounted on a hinge-rodindicatedat 8.

The material is I fed across the work' support bya feed-.dog'Q-carried -byethe feed-bar Hi." The feedbari-lfl is pivotedpat II to a feed-rocker l2.

The feed =rockeris mounted. =for-osci1lation--on a supporting. bar l3. The .feed rocker isoscillated by.- means of an arm I 4 which-is fixed to apin -l 5 carried; by the feed rocker. outer end. is connected :-to alinka-l 6.

The arm 4 r at. its Said -'link has 2.:piV0ta1 connection to the armrindicated at a IT. JI'he link cooperates withasleeve |8-carried by a crank pinsl9. ..This crank-pin: l9riSPI'OVid6dp3 with aa headed,- portion 20 which-. is-.mounted. in aslot 2liformedeina disk 22-1-whichisfixedwto .the main actuating-shaft indicated at -23.

-Surroundingthe disk 22 is a regulator cap-24.

said regulator .cap 24 is provided with a portion 04 extending over .the: disk 22,; and; also a front portion 24a which overlies the front face of :-the;disk

'22. There is aslot 25 formed inthis front-lace 24a. The; crank: pin- 1 9=passes through ..-this slot and then extends through the sleeve l8. Mounted onzthe crank pin I 9 is a washer 1 9a. This .washer lies. between the regulator: :cap and the disk --on the;end of the shaftwhich-=carriesthe crank pin." Oneside. of the washer 19a isconcentric with the inner surface of the peripheral portion :Of .the regulatora cap. ;The---washer,v is held from rotating-about the. crank pin bya retaining pin l9b which is threaded into the headedcportion ..zllof the crank pin. A nut. 26 is threaded onto ..the outerendof the crank pin. iThis nut Engages 2,255

a washer 2'! which overlies the sleeve l8. When the nut is turned, it will force the sleeve against the front face of the regulator cap and force the regulator cap against the washer HM, and the washer against the front face of the disk carrying the crank pin. The headed portion 20 of the crank pin will, of course, be drawn against the inner wall of the guiding slot therefor, and this will clamp the crank pin in a set position. When the nut is released, then the crank pin is released for adjustment. The width of the slot 25 is substantially the same as the diameter of the crank pin. This slot is in spiral form, with one end thereof nearer the center of the disk 22 than the other end. When the nut 26 is loosened and the regulator cap shifted, it will forcibly shift the crank pin in the radial slot in which it is mounted to a different set position in said slot. In other words, by shifting this regulator cap, the eccentricity of the crank pin may be positively varied. The peripheral surface of this regulator cap is provided with a series of spaced grooves extending lengthwise of the cap. These grooves are indicated at a, b, 0, etc. Fixed to the disk 22 is a gauge finger 28 provided with a groove or slot 29 in its outer end. When the groove 12 is brought into alinement with this groove 29 in the gauge finger, the crank pin is set at the proper eccentricity in order to produce a throw in the feed dog that will space the stitches so that there will be three and one-half stitches per inch. If the nut 26 is released and this regulator cap shifted while the main actuating shaft is held from movement so that the groove a is brought into alinement with this groove 29 in the gauge finger, then the crank pin is shifted to a different set position through contact with the side edges of the spiral slot in said regulator cap. When in this set position, then the crank pin has the proper eccentricity for imparting the throw to the feed dog which produces three stitches per inch. If this regulator cap is shifted to bring the groove cinto alinement with the groove 29, then four stitches per inch will be produced, and likewise by shifting this regulator cap when the nut 26 is' released, the crank pin maybe shifted to the proper eccentricity for producing the desired stitch length which will be indicated by the graduations on this regulator cap. After the proper setting of the crank pin has been accomplished, then the nut 26 is turned so'as to lock the regulator cap and the crank pin in the desired set position.

It will be apparent from the above that the section 1 of the cloth plate may be readily moved to open position, giving access to the nut 26 and the regulator cap. The operator holds the shaft from turning and loosens the nut 26, and then while the shaft is held from rotation, with the gauge finger in proper position to be viewed, the regulator cap is shifted to the stitch length which is desired to be obtained. This will] positively force the crank pin radially of the disk 22 to a set position to give the desired stitch length.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims g 7 Having thus described the invention, what I claim as new and desire to secure by Letters Pat- 7 ent, is-

1. In asewing machine, the combination of a feed dog, a feed bar carrying said feed dog, a

feed rocker to which said feed bar is connected, an actuating shaft, means operated by said actuating shaft for oscillating said feed rocker, said means including a crank pin carried by and adjustable radially of said shaft, cam means car- 5 ried by and movable circumferentially about the axis of said shaft for positively shifting said crank pin to different predetermined set stitch length positions, and means for locking said crank pin in a set position.

2. In a sewing machine, the combination of a feed dog,'a feed bar carrying said feed dog, a feed rocker to which said feed bar is connected, an actuating shaft, means operated by said actuating s aft for oscillating said feed rocker, said means including a disk carried by said actuating shaft, a crank pin carried by said disk and adjustable radially thereof, and cam means carried by the disk and shiftable circumferentially about said disk for shifting the crank pin on said disk to 20 different predetermined set s'titchjlengthpositions. r

3. In a sewing machine, the combination of a feed dog, a feed bar carrying said feed dog, a feed rocker to which said feed bar is connected, an 25 actuating shaft, means operated by said actuating shaft for oscillating said feed rocker, said means including a disk carried'by-said shaft, a crank pin mounted on said disk for adjustment radially thereof, a; regulator cap enclosing said 30 disk and having a spiral slot in the face thereof through whichsaid crank pin extends, said slot 'being dimensioned and shaped so that when said regulator cap is shifted on said disk it will positively shift said crank pin to different predeter- 35 in saidslot, a sleeve on said crank, a regulator cap having a portion extending over said disk and a front portion engaging the front face of said disk, said front portion having a spiral slot formed therein through which said crank pin extends,'saidsleeve being adapted to bear against said front face of the regulator cap, a nut adapted to be threaded onto said crank pin for securing said crank pin and said regulator cap in set positions, said regulator cap having indicating marks on the periphery thereof, and a gauge finger carried by said disk for indicating set positions of the cap whereby said cap may be turned for shifting said crank radially of the actuating shaft to different predetermined set stitch length positions.

5. In a sewing machine, the combination of a 60 feed dog and devices for imparting back and forth and rising and falling movements thereto including a rotary shaft, means for varying the extent of back and forth movement of said feed dog including a crank pin carried by said shaft, 65 said crank pin being adjustable radially thereof and devices shiftable circumferentially about the axis of the shaft for adjusting said crank pin to different set radial positions and means forming a part of said crank pin for securing said 70 crank pin and the adjusting means therefor rigidly in adjusted position.

6. In a sewing machine, the combination of a feed dog and devices for imparting back and forth and rising and falling movements thereto 75 including a rotary shaft, means for varying the extent of back and forth movement of said feed dog including a crank pin carried by said shaft, said crank pin being adjustable radially thereof and devices for adjusting said crank pin to different set radial positions, a gauge finger and indicating marks on the adjusting means for indicating the set positions of the crank pin and means forming a part of said crank pin for securing said crank pin and the adiusting means therefor rigidly in adjusted position.

7. In a sewing machine, the combination of a feed dog, a feed bar carrying said feed dog, a

feed rocker to which said feed bar is connected, an actuating shaft, means operated by said actuating shaft for oscillating said feed rocker, said means including a crank pin carried by and adjustable radially of said shaft, cam means carried by and rotating with said shaft for positively shifting said crank pin to different predetermined set stitch length positions, means for locking said crank pin in a set position and means rotating with said crank pin for indicating in stitched 10 lengths the set position of the crank pin.

FRANK A. KUCERA.

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