US1831506A - Feeding mechanism for top rock shaft machines - Google Patents

Description

Nov. 10, 1931. .1. R. MOFFATT ETAL FEEDING MEUHANISM FOR TOP ROCK SHAFT MACHINES 2 Sheets-Sheet l Filed Jan. 26, 1926 Nov. 10, 1931. J. R. MoFFAT,-r ET AL I FEEDING MECHANISM FOR TOP ROCK SHAFT MACHINES Fil'ed Jan. 26, 1925 2 Sheets-Sheet 2 IAD Patented Nov. l0, 1931 UNITED STATES *PATENT OFFICE .TAKES R. MOFFATT, OF CHICAGO, AND RALPH S. KELSO, 0F ROCKFORD, ILLINOIS,

ASSIGNORS TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, AV

,CORPORATION OF ILLINOIS FEEDING MECHANISM FOR TOP ROCK SHAFT MACHINES Application filed January 26, 1926. Serial No. 83,914.

The invention Yrelates yto new and useful improvements in feeding mechanisms for sewing machines, and more particularly to a feeding mechanism used in connection with a cylindrical work supporting arm for feeding the material lengthwise of the arm.

An object of the invention' is to provide a feeding mechanism ofthe above type, wherein the feed bar is so mounted that either end thereof may he raised 'or lowered during the assembling of the machinefor leveling the feed dog or for inclining the same slightly to a horizontal line.

A further object of the invention is to`provide a feeding mechanism of the above type which includes a main feed bar carrying the main feed dog, und an auxiliary feed bar carrying the auxiliary Vfeed dog, wherein both feed dogs during the assembling of the parts of the machine ina-y be leveled or inclined desired.

A still further object of the invention is to provide a feedingl mechanism of the above type, wherein the feed bar is supported by swinging link members adjacent the forward and the rear end thereof, and means is pro.

vided for maintaining the movement of the feed bar in a vertical plane. Y

A further object of the invention is to pro- 'vide a feeding mechanism of the above type wherein the main and theauxiliary feed dogs are given their movements up and down and back and forth, by devices which are actuated by two independent eccentrics.

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

In the drawings which show by way of illustration one embodiment of the inventionj Figure l a vertical sectional view through a portion of a sewing` machine embodying the improvements;

Fig. 2 is a plan view of the parts shown in Fig. l.. with the cover plate removed so as to show the deif'ices located l` i'icath the same;

Fig. 2l is a longitudinal sectional view through a' portion of theupper end of the supporting post and the end of the work supporting `arm carried thereby, showing in particular the manner of* mounting the swinging frame by links which carry the inner ends of the feed bars, whereby'the same may be raised and lowered; l

Fig. 4; is a sectional vie-w on the line L -4 of Fig. 1;

Fig. 5 is a view showing in section the feed bar removed from the machine, and the uppeicl ends of the supporting devices therefor, an

Fig. G is a sectional view on the line 6 6 of Fig. l.

The invention is directed broadly to a feeding mechanism for a sewing machine having a cylindrical work supporting Farm along which the work is fed during the stitching thereof. In the present embodiment of the invention, the work is fed off from the work supporting arm, although the feeding mecha nism may be very readilychanged so as to feed up the arm insteadof off from the arm. Y In the present embodiment of the invention, the work supporting arm is carried at the upper end of a supporting post, and the feeding' mechanism is actuated by eccentrics located at the lower end'of said post through suitable devices extending upwardly'in the postand connected to the feed bar operating devices at the upper ends thereof. It will be obvious, of course, that thework supporting arm may be suspended from a depending post instead of being carried at the upper end of avertical post. In other words, the invention is directedy particularlyl to the packing of the feed bars and the actuating devices therefor, ina cylindrical work supporting arm. The main feed dog is carried by the main feed bar which extendsv vlengthwise of the work supporting arm and is supported on swinging members in the form of vertical links. The forward linl'is attached at its lower end to a lever which is capable of being oscillated for raising and lowering the feed bar. The fulcrum of this lever is aneccentric member which may be manually adjusted for raising and lowering the front end of thefeed bar. The link at the rear end of the feed bar is mounted on an eccentric bearing which can also be adjusted during the assembling of the partsfor raising and loweringV the rear end of the feed bar. This lever for raising and lowering the feed bar is connected to an eccentric strap which cooperates with an eccentric on a shaft extending into the supporting post for the work supporting arm. The feed bar is moved back and forth by a rock lever carried by the work supporting arm adjacent the rear end of the feed bar. This rock lever is connected to an eccentric strap which cooperates with an independent eccentric on said shaft at the lower end of the supporting post for the work supporting arm. The rock lever is connected by a link to the main feed bar so that when said rock lever is oscillated it will move the main feed bar back and forth. The rear end of the feed bar is slabbed so as to provide vertical faces parallel with each other, which extend in between suitable vertical bearing faces formed in a lug on the frame of the machine. rlhese vertical faces on the frame cooperate with the vertical faces on the feed bar in maintaining the up and down and back and forth movements of the feed bar in a vertical plane. In other words, they are for the pur pose of preventing-.the feed bar from tilting. but permit the feed bar to move freely up and down and back and forth. The auxiliary feed bar is mounted on the main feed bar so that it moves up and down therewith. It is, however, moved back and forth independently of the main feed bar by an arm connected by a link to the auxiliary bar and connected by a link to the swinging link support at the rear end of the feed bar. Said swinging link at the rear end of the feed bar is connected to said main feed bar at the upper end thereof. so that the back and forth movements of said feed bar oscillate said swinging link, and the swinging link in turn, through this link connection, oscillates the arm and this imparts back and forth movements to the auxiliary feed bar.

Referring more in detail to the drawings, the improved feeding` mechanism includes a cylindrical work supporting arm 1 carried by al vertically extending post 2, which in turn is mounted on a cylindrical arin 3. Located in said cylindrical arm 3 is an actuating shaft 4. Said actuating shaft 4eXtends into said post 2 at the lower end thereof. EX-

` tending lengthwise of the work supporting arm 1 is a looper supporting shaft 5 on which is mounted a looper 6. At the rear end of this looper supporting shaft there is an armv carrying a ball stud 7 A lever 3 is connecterL at its upper end t0 said ball stud 7. This lever is fulcrumed on an arm 9 which is capable of sliding in a sleeve 1() carried by a shaft 11. The shaft 11 is mounted in a bushing 12 in the rear end of the work supporting arm 1. It will be `noted that this work supporting arm 1 is separated from the post 2 along` the l line zzz-, and is secured thereto by suitable screws 13. The lower end ofthe lever 8 is connected to a crank 14, which crank is rigidly connected to a plate 15 capable of radial adjustment on a disk 16 mounted on the end of the shaft 4. The purpose of this radial adjustment is to vary the stroke of the lever 8. As the shaft rotates, this crank 14 will rotate in a circular path lying in aI vertical plane. This causes the upper end of the lever to move to the right and to the left as viewed in Fig. 1, which impart-.s the endwise movements to the looper shaft and gives a needle avoiding movement to the looper. Said lever 8 is fulcrumed on the arm 9 just below its'connection to the ball 7, and this is what causes the upper end of the lever to move back and forth as stated. As the lever 8 moves up and down, due tothe rotations of the crank 14, it will oscillate the looper supporting shaft 5 and move the looper into and out of the needle thread loop.

Extending lengthwise of the work supporting arm is a main feed bar 17. Mounted on the left-hand end of this feed bar 17 is the main feed dog 18. The main feed bar 17 is connected to swinging links 19 adjacent the forward end thereof. These links 19 are connected at their upper ends to a pin 2O carried by the feed bar. The lower ends 21 of these links 19 are pivotally connected to a lever 22. The lever 22 is fulcrumed at 23 on a pin 24 which is provided with an eccentric center portion 25. This pin 24 is provided with a slot 26 for a screw driver, whereby it may be turned in its supporting bearing, and the pin is held in adjusted positions by a set screw 27. The lever 22 at its right-hand end as viewed in Fig. 1, is connected at 28 to the upper end of an eccentric strap 29 which cooperates with an eccentric on the actuating shaft 4. As the shaft 4 rotates, it will oscillate this lever 22' and the lever, through the links 19, will raise and lower the forward end of the feed bar. This movement is for the purpose of moving the feed dog into and out of engagement with the material being fed along the work supporting arm.

The inner end of the feed bar 17 is pivoted at 30 to a swinging yoke link 31, and this swinging yoke link 31 is carried by a pin 32 at the lower end thereof. This pin 32 is mounted in an eccentric sleeve 33 which in turn is mounted in a lug 34 formed as a part of the work supporting arm 1. A set screw 35 holds the sleeve 33 in adjusted positions.

This sleeve projects slightly beyond the side faces of the lug 34, and therefore, can be reached for adjustment during the assembling of the parts of the machine. t oftenV occurs that the parts to be assembled may be slightly inaccurate or off centers, so that when the feed bar is placed, it is not quite properly positioned for efficient feeding of the material` lf it isdesired to levelv the feed dog or tilt it one way or the other relative to a horizontal line, this can be done by loosening `theset screw and` adjusting'thiseccem tricvsleeve 33.-:i 'The adjusting of .thisv eccen tric sleeve, together with the adjustment ofvv ingmovements thereof,:or in anyway chang'- path of movement ing the character of lthe of thefeed dog. f

The mainfeed Abar l? provided at its rear end With aprojectingi portionsBG Which is slabbed so as, to provide vertical .faces which are adapted to fit between the vertical p faces of; the.parallel.member-sf 37 carried by the lugs 34. Thefprojecting1- portion 86 of thefeed bar is free `to move up. and; down and back `and forth between thesemembers 37. T he purpose of the members '37 is to pre` ventanylatera l tilting `of the feed bar as it moves back; and forthwiththe swinging link members wand-31.. Thus it is that theportion gserves kto guide the feed bar in its movements, and not only prevents thetilting of the same, but any lateral shiftingv of the feed bar on its.supportinglinks This main` feed bar is moved'back and forth by arlinkzBS :which is p'ivoted at l9'to the main feed bar. The rear end of; this link 38 is pivoted :at405t0 a rock lever41 which is mounted ona pivot stud 421threaded into Vthe lugl 34.y The 'rock lever 4l has a rearwardly projecting arm 43 Whichis con nected to an eccentric stm-p44,-y andfthis eccentric strap 44 in turn v cooperates with an eccentric on the actuating shaftv 4,A It is noted that the ystud 45 :carried-by the arm `43 andy to Whichthe eccentric strap 44 is c onnected, has acone face, With the base of the cone at the outer end of the-stud'. Said cone stud is providedvwith a screwl slot 46; vThe stud has a threaded. portioiira'i whieh threaded intothearm 43. By` turningthe cone stud, it maybe threadedfinto-or out of the Aarniil, so as toladjust the sameand said cone stud:is heldin adjusted positions by means off a lock nut- 48. There is asimilar cone stud connection between the 1ever22 and the eccentric strap. 29;

The auxiliaryA feed; dog 49 is carried by. an auxiliary feed bar 50. l'hemainfeedbark 17 is provided with a longitn:ilifnal` slot or recess 5l` inA which the auxiliary feedebar 50 As the. actuating shaft 4 rotates, the eccentric. strap44 Will is'located. The VAauxiliary feedbar: is free to moveendwise in thisI slotor recess 51T, and -is moved byy a link 5Q1 eivotally connectediat 53 to the auxiliary feed bar., This link, at its other end, is pivotedat 54lto an arm 55, Which armLis provided with spaced lugs 56, 56 at itslo'vver end (see F ig. 6), mounted onthe fulerum pin Q41 for the lever 22; The lever 22 extends between these lugs 56, 56. The parts ofthe piu 24 on which said lugs are mormted are concentric with the center of said pin, so that when saidpin is rotated for the purpose of raising and lmveringr the fulcruni: point of the lever 2li, such adjustment does-notin anyway raise orv` lower the arm 55;

The armin turn is connected to a link 57v at 58, and the link57 is connected toa stud 59 mounted in an arc-shapedlslot 60 formedl in thefsxvinging yoke link 3l. This slot 60 is curved about the point 58 as a center. Said stud '59is moved along'theslotiby means of alever 6l connected by a shortlink 62 to the link .5T-. This lever 6l is rigidly connected to a shaft 63 and on s: ifdshaft is a rigidly connected arm 64. Said arm 64 is inturn'con;v nected to a. crankpin 65mounted on a disk 66rigida'vith a. short shaft 67. `The arm 64 is `provided with a slot 642 extending lengthwise thereofivhich` receivesthe. pin 65, and this establishesy a `connection betweenV the crank pin andfthe arm.` The shaft 67 like- Wise carries an arm 68 Which extends beneath a fixed segment plate 69. .A finger: piece 70 is securedtothe arnr6'8 and is capable of being moved along saidfs'eginent plate'GQ, andheld in adjusted positions along the same in the usual` manner. AVhen Vthisiinger piece 70 is shifted along` the segment plate, itfyvillrock the disk 66,.Which, .through the'crankfpin, will raise or lower'ithe right-handfend of the arm 64. This Will in turn raise or lowerlthc lever 6l. and shiftv the `stud59 `inthe slot. The purpose of this'adjustment: ofthe stud 59is to varythe stroke of the auxiliary feed bar. The swinging. yoke link 31- is connected by mcansof' the liiivo'tvbolt 30;to the rear end ofthe main feed bar22fso that as the main feedbar moves backiand forth',.it Willswing this yoke link 31A, and the Vyoke link` V31," through its connection with the auxiliary feed bar, will movesaid auxiliary feed .bar back. and forth. By shifting the stud 59 the extent of moveniient of the' auxiliary feed bar maybe made lgreater than the`v` main feed bar, orrifdesired, may be made less than the movement of the. main feed bar. ThisauXilv izo tric straps 29 and 44. lThe eccentric strap 29 through-the level' 22 moves the main feed har up and down, and as the auxiliary feed-` bar movesfup and down therewith, both feed. bars are raised and lowered by this eccentric strap 29. Both the main and lthe-auxiliary feeddogs are, therefore, raisedl into engagement with the material, and lowered out of engagement with the material, through the aid of this eccentric strap 29. The main feed` bar is moved back and forth by the eccentric strap 44 operating through the rock lever 4l, and the link 38. The inner end of this link 38 is connected to a stud which can be adj ustedin a slot formed in the arm of the rock lever 4l, and thus the stroke imparted to the main feed bar varied. The main feed bar as it moves back and forth, oscillates the yoke link 3l through the pivot connection 30 therewith, and the yoke link imparts the back and forth movement-s to the auxiliary feed bar, so thatV both feed bars are reciprocated by means of the eccentric strap 44, and the devices which connect this eccentric strap 44 to the auxiliary feed bar are capable of adjustments so that the movement of a different length may be given the auxiliary feed bar from that given the main feed bar. lThe movement of the main feed bar can also be adjusted.

The main feed dog 18 is'secured to the main feed bar by means of a screw 72. The auxiliary feed dog is secured to the auxiliary feed bar by a screw 73. The auxiliary feed dog slides back and forth on the shank ofthe main feed dog. The auxiliary feed bar 5() is held in the recess or slot 5l by a plate 74 which is secured to the main feed bar by a screw 75. This plate is located in a recess formed in the side face of the auxiliary feed dog and overlies the bottom wallA of the recess. The recess is long enough so that the auxiliary bar is free to move endwise, but cannot move vertically relative to the main feed bar.

From the above it will be noted that a feeding mechanism for a'cylindrical work supporting arm has been provided, wherein the parts are so constructed and arranged that the feed dogs are positively moved back and forth and raised and lowered, and through the aid of comparatively few parts. Furthermore, the feeding mechanism has been provided, wherein the feed bars may be leveled or inclined during the assembling of the parts in order to insure the proper setting of the feed dogs. While the feeding mechanism is shown and described as feeding the material off the work supporting arm, it will be understood, of course, that it may be readily used for feeding the material on to the arm, if so desired. Of course,in order to bring this about, the devices-for moving the feed bars back and forth would have to be changed and timed to accomplish the movements of thel feed dogs in proper timing with the movements of the stitching mechanism. Thile the cylindrical work supporting arm has been shown as mounted on the upper end of a post with the shaft extending into the lower end thereof, it will alsobe readily understood that the work supporting arm may be suspended from a depending member, wherein the actuating shaft is above the feed bars. Y

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. i

Y Having thus described the invention, what we claim as new and desire to secure by Letters Patent, ist l. A feeding mechanism for sewing machines including a supporting member, a feed bar mounted in said supporting member, a feed dog carried thereby, swinging members located adjacent the opposite ends of said feed bar and kpivotally connected thereto for supporting the same, a lever extending lengthwise of the feed bar and pivotally connected with theswinging member at the forward end of the feed bar, means for oscillating said lever for raising and lowering the forward end of the feed bar, means independent of said swinging members connected to said feed bar for moving the same back and forth on said swinging members and means for preventing lateral tilting of said feed bar as it moves back and forth with said swinging members.

2. 'A feeding mechanism for sewing machines including a supporting member, a feed bar mounted in said supporting member, a feed dog carried thereby, swinging members located adjacent the opposite' ends of said feed bar and pivotally connected thereto for supporting the same, a lever extending lengthwise of the feed bar and pivotally connected with the swinging member at the forward end of the feed bar, means for oscillating said lever for raising and lowering the forward end of the feed bar, means connected to said feed bar for moving the same back and forth on said swinging members, an eccentric member for ysupporting said swinging member at the rear end of said feed bar, said eccentric member being mounted in said supporting member for the feed bar, and means for holding said eccentric member in various adjusted positions, said eccentric member being capable of adjustment for raising and lowering the rear end of the feed bar.

3. A feeding mechanism for sewing machines including a supporting member, a feed bar mounted `in said supporting member, a feed dog carried thereby, swinging members located adjacent the opposite ends of said feed bar and pivotally connected thereto for supporting the same, a lever extending lengthwise of the feed bar and pivotally connected with the swinging member at the forward end of the feed bar, means for oscillating said lever for raising and lowering the oaf liga-1:59,@

ferward end ofthe feed ber,'1nenne.ee11neeted tol `said feed bar for moving the same back and forth on said swinging members, an eccentric member forsupporting said swinging member atthe rearend of said feed bar, saideccentric member being mounted in said supporting member for the feed bar, means for holding said eccentric member in various adjusted positions,saideccentric member being capable of adjustment for raisingand lowering the rear end ofthe feedl bar, an eccentric member on which said lever is mounted, and means whereby said eccentric member can be adjusted and held in adjusted positions for raising and lowering the front end of the feed bar. i

4;. A feeding mechanism for sewing m21-, chines including a work supporting cylinden a feed bar extending longitudinally of said cylinder, a feed dog carried thereby, swin ing links located substantially at opposite en s of the feed bar and pivotall'yrconnected thereto for supporting the same, a levereiitendingy longitudinally of said cylinder and pivotally supporting the link at the forward end ofthe feedbar,1 neans for oscillating saidlever for raising and loweringthe feed dog, and means independent ofthe swinging links connected With said feed Ybar intermediate the ends thereof for moving said feed bar backand forth and means engaging the feed bar inde-` pendently of the` links for guiding the feed barV in its upY and `down and endwise move-v ments, so as to prevent tilting or lateral shiftT ing of the feed bar.

5,' A feeding mechanism for sewing machines including a work supporting cylinr derjal feed barextending longitudinally of said cylinder, a feed dog carried thereby, swinging links located substantiallyat,oppor site ends of the feed bar and pivotall-y connected, thereto for Supporting the. Same, a lever extending' longitudinally of said cylin-Y der and pivotally supporting the link at the for-ward end of the feed bar, means for oscillating said lever for raising and lowering the feed dog,vmeans connected with said feed bar intermediate the ends thereof for moving said feed bar back and forth, an eccentric/member on which the swinging link at, the rear end of the feed bar is mounted, andmeans whereby said eccentric memberl can be ad-v justed and held in adjusted positions for rais-4 ing and lowering said swinging link. A

6'. A,` feeding mechanism for sewing machilies, including a work supporting cylinder, a feedbar extending longitudinally ofsaid cylinder, a feed dog carried thereby, swinging links located substantially at opposite ends of thefeed bar and pivotally connected there` te. fer supporting the saine, a lever entend-ng longtinlnally1 of Said cylinder andpvotally Supporting the lnlratv the forward end Off thefeed. bar1nef1ns0r Oscillating said lever or raising and llowering the feedfdog,l means eenneeted with Said, feed bar l1.1,ternledietetheV ends thereef'or nre/ving Said feed bar beek, and forth, an eccentric Inernber on which the swinging link at the rear end, 0f the feed bar is mounted, means whereby said eccentric, member can be adjusted and heldin adjusted j aositions for raising and lowering said swinge ing link, an eccentric member on which saidI lever is. -nionnt-ed, and meansferadjusting sdid eccentric member and holding the-same in adjusted positions for raising and lower? feed bar, a link having an adjustable connece` tion ,with said rock. lever and connected with the, feed bar interlnedate the ends the/,120@ and means for oscillating said rock lever for mening the feed dogback and forth.Y t

8. A feed-.ing mechanism for sewing ma; Chnes inelndngn work, Supporting cylinder, a feed bar extending longitudinally of said cylinder, a feed dog carried' thereby, swinging linksfpivotedto said feed bar adjacentA the opposite ends thereof for supporting the saine,A a lever extending longitudinally of said 'cylinder and pivotally supporting the link at `the forward end of ,the feed bar, an actuating ella-ft, an. eccentric thereon, eef :e

centric strap cooperating with said' eccentric and directly connected to said lever` for oscil-y lati-ng the saine to raise and lower tbe-feed dog-,ia rock lever independent of said swing-y ingflinks adjacent the rear` end of sai'dfeed bar,` a link connecting said rock lever` to the feed bar intermediate the ends thereof, a second eccentric on said actuating shaft, and an eccentric strap cooperating therewith and directly connected to said rock lever for inovi.'

ing said feed bar back and forth.`

9. A feeding mechanism for sewing ma: chines including a work supporting cylinder, a feed bar extending" longitudinally of said cylinder, a feed dog carried thereby, swinging links pivote-d 'to saidfeed baradjacent the opposite ends thereof for supporting the saine, a lever extending longitudinally of said cylinderand pivotally supporting. the link atthe forward end of the feed bar, an actuat.- 'fl ing shaft, an eccentric thereon, an eccentric Strap COOP-@rating with Said eeeentrie and drectly connected yto said lever for oscillating the Samet@ raise andi lower the feed den,l a

rock lever adjacent the rear end of said feed "l" bar, a link connecting said rock lever to the feed bar intermediate the ends thereof, a second eccentric on said actuating shaft, an eccentric strap cooperating therewith and directly connected to said rock lever for moving said feed bar back and forth, an eccentric member for supporting the link at the rear end of the feed bar, and means for adjusting said eccentric member and holding the same in adjusted positions during the assembling ofthe parts for leveling the feed dog.

l0. A feeding mechanism for sewing machines including 'a work supporting arm, a feed bar extending longitudinally thereof, a feed dog carried by said feed bar, swinging links locatedsubstantially at opposite ends of the feed bar and pivotally connected thereto for supporting the feed bar, means for raising and lowering the link at the forward end of the'feed bar for raising and lowering the feed dog, means independent of the swinging links and connected with the feed bar intermediate the ends thereof for moving said feed bar longitudinally, said feed bar at the rear end thereof having a projecting portion provided with vertical faces, said work supporting arm having spaced members betweenwhich said projecting portion of the feed bar moves, said members having free contact with the vertical faces on the feed bar for preventing any lateral tilting ofthe feed dog as the feed bar moves back and forth on said swinging links. l l1. A feeding mechanism for sewing machines includinga work supporting arm, a main feed bar extending longitudinally of said work supporting arm, a feed dog carried thereby, said feed bar having a recess in the upper face thereof, an auxiliary feed bar located in said recess, means for holding said auxiliary bar in said recess and permitting the endwise movement of the auxiliary bar relative to the main bar, an auxiliary feed dog carried by said auxiliary feed bar, swinging links located substantially at opposite ends of said main feed bar and pivotally connected thereto for supporting the same, a lever extending longitudinally of said arm on which the forward link isI pivoted, means for oscillating said lever to raise and lower the main feed bar, means connected with the main feed bar intermediate its length for moving said feed bar back and forth, a pivoted vertical arm located intermediate the ends of the main feed bar, a link connecting said arm to the auxiliary feed bar, a link connecting said arm to the swinging link at the rear end of the feed bar whereby the oscillations of said last-named swinging link impart endwise movement to the auxiliary feed bar.

l2. A feeding mechanism for sewing machines including a work supporting arm, a. main feed bar extending longitudinally of said work supporting arm, a feed d og carried thereby, said feed bar having a recess the upper face thereof, .an auxiliary feed bar located in said recess, means for holding said auxiliary bar in said recessV and permitting the endwise movement of the auxiliary bar relative to the main bar, an auxiliary feed dog carried by said auxiliary feed bar, swinging links located substantially at opposite ends of said main feed bar and pivotally connected thereto for support-ing the same, a lever extending longitudinally of said arm on which the forward link is pivoted, means for oscillating said lever to raise and lower the main feed bar, means connected withthe bar, said swinging link at the rear end of the feed bar having an arc-shaped slot carrying a stud to which the link which imparts movements to the auxiliary feed bar is connected, and Vmanual means for shifting the position of the stud in said arc-shaped slot fgor Varying the throw of the auxiliary feed 13. In a feedinof mechanism for sewing machines, the combination of a feed bar, a

feed dog mounted on said feed bar, means for imparting feeding movements to said feed bar, and means adjacent each end of said feed bar for supporting the same, each of said supporting means including devices capable of being adjusted whereby the vlongitudinal axis of the path of travel of the feed dog may be adjusted bodily vertically or the anglel thereof changed to various set positions without changing the character of the path of movement of the feed dog.

14. In a feeding mechanism for sewing machines, the combination of a feed bar, a feed dog mounted on said feed bar, means for imparting feeding movements to said feed bar, and pivotally mounted means adjacent each end of said feed bar for supporting the same, each of said supporting means including devices capable of being adjusted whereby the longitudinal axis of the path of travel of the feed dog may be adjusted bodily vertically or the angle thereof changed to various set positions without changing the character of the path of movement of the feed dog.

15. In a feeding mechanism for sewing machines, the combination of a feed bar, a feed dog mounted on said feed bar, means foroimparting feeding movements to said feed bar, pivotally mounted supporting devices at each end of said feed bar for supporting the same, each'device including an eccentric member capable of adjustment to various set positions whereby the longitudinal axis of the path of travel of the feed dog may be bodily vertically shifted or the angle thereof changed to various set positions without changing the character ofy the path of movement of the feed dog.

16. A feeding mechanism for sewing machines including in combinatioma feed bar, a feed dog mounted on said feed bar, devices for imparting rising and falling movements to said feed bar, devices for imparting back and forth movements to said feed bar, pivotally mounted means for supporting said feed bar adjacent the front and rear ends thereof, each of said pivotal mountings including an eccentric member adjustable to various set positions whereby the longitudinalaxis of the path of travel of the feed dog may be bodily adjusted vertically or the angle of said longitudinal axis changed without changing the character of the path of movement of the feed dog.

17. In a feeding mechanism for sewing machines, the combination of a feed bar, ay feed dog mounted on said feed bar, means for imparting feeding movements to said feed bar and means for supporting said feed bar adjacent the front and rear ends thereof, each of said sup orting means including devices capable of lieing adjusted whereby said feed bar may beadjusted vertically at either end for altering the position of the longitudinal axis of the path of travel of the feed bar without changing the character of the path of movement of the feed do 18. A feeding mechanism for sewing machines including in combination a feed bar, a feed dog mounted on said bar, means for imparting feeding movements to said feed bar, pivotally mounted supporting means for said feed bar located adjacent the front and rear ends thereof, each of said supporting means including devices capable of being adjusted whereby the feed bar may be adjusted verticallyat either end thereof, each of said devices including an eccentric member adjustable to various set positions without changing the character of the path of movement of the feed dog. a

In testimony whereof, we affix our signatures. v j

JAMES R. MOFFATT.- RALPH S. KELSO.

Images