US2445297A - Feeding and presser mechanisms for sewing machines - Google Patents

Description

July 13, '1948.

F. F. zEu-:R

FEEDING ANP PRESSER MECHANISMS FOR 'SEWING MACHINESA Filed April 2, 1946 5 Sheets-Sheet 1 3| um REBER/CKE Zum July 13, 19348.

F. F. :ZEI ER FEEDING AND PRESSER MECHANISMS FOR SEWING MACHINES Filed April 2; 1946 5 Sheets-Sheet 2 7a Ma F. F. ZEIER July 13, 194s.

FEEDING AND PRESSER MECHANISMS FOR SEWING MACHINES Filed April 2, 1946 5 Sheets-Sheet 3 HEUER/cnf' ZE/ER July 13, 1948'.

FEEDING AND PREssER nEcHANIsMs Foa SEWING MACHINES 5 Shets-v-Sheet 4- Fled April 2, 1946 JHLuU/WM EIDER/CHF Zf/m July 13, 1948, y v F. F. zElER 2,445,297 'FEEDING AND PRE'ssR MEcHANIsMs Fox SEWING MACHINES 5 sheets-sheet s Filedv April 2, 1946 Patented July 13, 1948 FEDING AND PRESSER MECHANISMS FOR SEWING MACHINES Frederick F. Zeier, Stratiield, Conn., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application vApril 2, 1946, Serial No. 658,963

23 Claims. (Cl. 112-'212) This invention relates to sewing machinesand, more particularly, to that class of sewing machine which utilizes a clamp-feed mechanism in conjunction with a presser-foot of the type which is continuously in engagement with the work during the sewing operation.

It is an object of this invention to provide, in a machine of this type, improved means for lifting simultaneously the upper feeding foot and the presser-foot off the Work with a minimum of force.

Another object of this invention is to provide, in the present class machine, improved feeding and presser-foot lifting mechanism which will enable operation of the machine at a much higher rate of speed than heretofore was possible.

Withl the above and other objectsY in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Fig. 1 represents a rear side elevation of a sewing machine in which the present invention is incorporated. f

Fig. 2 represents a top plan view ofthe present machine.

Fig. 3 represents a left end elevation of the sewing machine'showing the stitching and feed` `ing mechanisms with the bed and work-supporting plate in section, and with the needlein its uppermost position.

Fig. 4 represents a left side elevation of the stitching and feeding mechanisms as removed from the sewing machine frame and with the needle in its lowermost position.

Fig. 5 represents a sectional view of the upper feeding and stitching mechanism,'taken substantially along line 5-5 of Fig. 1.

Fig. 6 representsa sectional view of a portion of the feed-bar actuating mechanism, taken substantially along line 6-6 of Fig. 3.

Fig. 'l represents a sectional View showing a presser-bar lifting means and taken substantially along line 1 1 of Fig. 5.

Fig. 8 represents a sectional View showing a portion of the presser-bar with its associated elements and taken substantiallyv alongline 8--8 of Fig. 5.

Fig. 9 represents a front elevation of the springs shown in Fig. 1.`

. Fig. .10 represen-ts a sectional view showing the 2 presser-lifting mechanism in its normal position and taken substantially along line Ill-IU of Fig. 2.

Fig. 11 is an illustration in side elevation'of the lpresser-lifting mechanism at that point in its cycle at which the presser springs are fully untensioned.

Fig. 12 is anillustration of the presser-lifting mechanism at that point in the cycle at which the presser-bar and top feed-bar are fully raised off the work.

Referring to the drawings, the invention is embodied in a sewing machine having a frame comprising a bed I6 from one end of which rises a standard il of anoverhanging bracket-arm AI8 terminating in a head i9. J ournaled for rotation within this frame is a mainor arm-shaft 2l)y carrying at its outer end the usual belt-driven balance-wheel A2| and at its innerend a counterbalanced needle-bar actuating'crank 22. The` shaft 20 is connected by a vclip-belt 23, herein shown incompletely, to a belt-pulley 24 fast upon the outer end of a lower mainor bed-shaft 25 journaled for rotation in the bed I6, the ratiol between the shafts 20 and 25 being one-to-one.

Actuated by the bed-shaft 25 is the usual lower four-motion work-feeding mechanism, including a feed-dog 26, and the looper mechanism including a chain-stitch-looper 2l. For thesake of brevity, a detailed description of the four-motion.

feeding mechanism will not be given herein,l inasmuch as the same is fully described and claimed in my U. S. Patent No. 2,292,258, August 4, 1942.

With regard to the looper mechanism disclosedin the drawings, it will sufceto say that the looper 2l is preferably of the two motion. type having loop-seizing and -shedding movements only in the line of feed, the looper advancing to seize the needle-loop in a direction opposed to the direction of feed. y

Referring now to the mechanism within the machine-head I9, it will be seen in Figs., 1, 3 and 4 that a needle-bar actuating link 28 is pivotally mounted upon the crank 22 by means of a screw 29. The lower end of the link 28 is apertured to receive a pin 30 integral with a split collar 3l clamped upon the usual needle-,bar 32. Carried by the lower end of the needle-bar 32 is a suitable needle 33. Through the mechanism justl de.-y

` scribed the needle-bar 32 is reciprocated endwise in proper timed relation with the complemental looper 2l to produce chain-stitches.

The needle-bar 32 is journaled in bearing members 34 and 35 projecting from the needle-bar frame 36 which is provided with a horizontally projecting fulcrum-rod 31 journaled within the lug 38 of the machine head I 8.

The needle-bar frame 56, in the machine illustrated, is oscillated in timed relation with th'e four-motion feed-dog 26 through mechanism comprising a rock-lever 35 (see Fig. 1) preferably clamped at its lower end 48 upon the end portion of the fulcrum-rod 31. At its upper end, the

rock-lever 35 is pivotally connected, by means of a bolt 4| and nut 42, to one end of e, relatively short pitman 43 formed at its other end with a strap 44 embracing an adjustable eccentric 45 secured to rotate with the arm-shaft 28. It will be understood that as the arm-shaft 28 is rotated, the eccentric 45 actuates th'e pitman 43 which in turn operates the rock-lever 38 to oscillate the needle-bar frame 36 about the axis of the fulcrum-rod 31. The amplitude of oscillatory movement imparted to the needle-bar frame is dependent upon the amount of eccentricity of the eccentric 45 and, in order to vary the amplitude of oscillatory movements of the needle-bar frame to harmonize with the stitch-length to which the lower feeding mechanism is set, the eccentric is made adjustable. A complete description of this type of adjustable eccentric may be found in the U. S. patent of W. Myers, No. 2,128,031, August 23, 1938. For a more detailed description of the present type of needle-bar mechanism, reference may be had to my U. S. Patent No. 2,329,681, September 14, 1943.

Referring particularly to Figs. 3 and 4, the needle-bar frame 36 has a vertically apertured bearing lug 46 formed thereon rearwardly of the bearing portion 35. Slidably mounted within this bearing lug 46 is a top feed-bar 41 carrying at its lower end a feeding foot 48 which is adapted to cooperate with the needle 33 and the lower feeddog 26 in the feeding of the work over the bedplate 49. Since the feed-bar 41 is carried by the needle-bar frame 36, the latter element will impart the same amplitude of vibrating motion in the line of feed to both the needle-bar 32 and the top feed-bar 41.

The upper end of the top feed-bar 41 is provided with a cross-pin 58 which is slidingly disposed within the forked free end of a substantially horizontally disposed feed-lift lever or arm 52. The confined end of the lever 52 is pivotally mounted upon a fulcrum-pin 53 which is secured within the lower rear portion of the machine head I8.

In order to prevent the feed-bar 41 from turning about its longitudinal axis, th'e top portion thereof is provided with a pair of cheeks 54 which carry the cross-pin 58 and which embrace the forked portion 5I yof the bar 52.

Pvotally carried by and at the center of percussion of the feed-lift lever 52 is a pivot-pin 55 of a bell-crank lever having arms 56 and 51 of which the arm 56 is pivotally connected by a pin 58 to the lower end of a link 55. The upper end portion of the link 59 is connected by means of a pin 68 to an actuating crank 6| carried by one end of a rock-shaft 62 which is journaled in bearing lugs 63 and 64 provided on the machine bracket-arm I8 and head I5, respectively. The rock-shaft 62 is disposed in parallelism with the needle-bar actuating shaft 28.

Secured upon the opposite end portion of the rock-shaft 62, by means of screws 65, is a short crank 66 carrying a pin 61 which is pivotally embraced by the forked end or .a pitman 68 whose other end terminates in an eccentric strap 65.

The strap 68 embraces an adjustable eccentric 18 secured to rotate with the arm-shaft 28. It will be understood that as the arm-shaft 28 is rotated, the eccentric 16 actuates the pitman 68 which', in turn, imparts rocking movements to the rock-shaft 62 through the medium of the crank 66. The amplitude of these movements may be varied by adjusting the throw of the adjustable eccentric 18. For a more detailed description of an adjustable eccentric of this type, reference may be had to the U. S. patent of A. I-I. DeVoe, No. 14,218, reissued November 28, 1916.

Pressing downwardly upon the feed-lift lever 52, at a point between the bell-crank pivot point and the forked end 5| thereof, is one end of a spring-biased blade-lever 1| which is located outside of and rearwardly adjacent to the machine bracket-arm I8. The other end of this lever 1| is biased upwardly by means of a coil spring 12 which is operatively connected to an arm 13 pivotally mounted upon the bracket-arm I8. The lower end of the spring 12 is pivotally connected to the lever 1| by means of a bolt 14 and a nut 15. As illustrated more -particularly in Figs. 5, '7 and 10, the lever 1| is fulcrumed adjacent to the feed-lift crank 52 upon a knife-edge 16 of a fulcrum-piece 11 extending from a stub-shaft 18 which is rockably mounted within an aperture 19 formed in the lower portion -Of the machine head I5. In order to prevent the spring-biased lever 1| from exerting any side thrust upon the feed-lift lever 52, a steel ball 88 is held, by means of a sheet metal cage 8|, between said lever 1| and crank 52. The cage is secured to the crank 52 by means of screws 83.

Referring particularly to Figs. 5 and '1, the lever 1| is apertured so as to afford clearance for a guide-pin 84 projecting upwardly from the shelf portion 85 of the head I8 and extending through the forked end of a guide-arm 88 which is clamped by means of a screw 81 to the upper reduced portion of a presser-bar 88 which will be described hereinbelow. The pin 84 thus prevents the lever 1| from moving sidewise.

The oscillatory motion of the above noted rockshaft 62 causes the bell- crank lever 56, 51, to swing in a vertical plane about its pivot-pin 55 in the feed-lift lever 52, so that the arm 51 thereof successively tends to raise and lower. Referring to Fig. '7, the arm 51, on its downstroke, engages the shelf 85, and further movement of the bell-crank lever can only result in raising the pivot point thereof, which latter action will, of course, raise the forked end 5| of the feed-lift lever 52 with the consequence that the top feeding-foot 48 is lifted clear of the throat-plate 49', as is illustrated in Fig. 3. When the arm 56 moves downwardly, thus to throw the arm 51 upwardly relatively thereto, the spring-biased lever 1|' forces the member 52 downwardly and the foot 48 is forced against the work and the arm 51 lifts off the shelf 85. Continuous oscillation of the rock-shaft 62 will, therefore, cause the top feedbar 41 alternately to rise and fall under the continual pressure of the spring-biased lever 1 I. The motions of the rock-shaft 62 are synchronized with those of the needle-bar 32 so that the usual compound feeding mechanism will be effected.

Adjustment of the rock-shaft actuating eocentric 18 will effect adjustment in the amplitude of the vertical movements imparted to the top feed-bar.

The machine head I9 is provided with a vertically disposed stationary bearing member 89 in which the above mentioned presser-bar 88 is slidingly mounted so as to be located slightly rearwardly of the top feed-bar 41 and out of the line of feed at that side of the line of feed nearest to the machine bracket-arm |8. A usual type of presser-foot 90 is carried by the lower end of this presser-bar 88. Formed in the upper portion and between the ends of the presser-bar 88 is a slot 9|, adapted to receive the free end of a secondary spring-biased blade-lever 92 which presses downwardly against the presser-bar. This lever 92 is located substantially beneath the primary lever 1| and the 'other end thereof is biased upwardly by means of a secondary coil spring 93 which is operatively connected to a bracket 94 carried by the bracket-arm I8. The lower end of the spring 93 is pivotally connected to the lever 92 by means of an eye 95. As illustrated more particularly in Figs-5, '1 and 10, the lever 92 is fulcrumed adjacent to the lever 1| upon the knife-edge 16.

By means of the secondary coil spring 93, the presser-foot 90 is constantly urged downwardly against the work and thus cooperates with' the above described feeding mechanism in the feeding of the work.

As hereinabove noted, one end of the lever 1| is pivotally secured to the coil spring 12 by means of the bolt 14. Referring more specifically to Figs. 1, 2 and 10, the lower end of the spring 12 is secured to the lower cup-shaped member 96 which is telescopically i'ltted within the upper and reversely directed cup-shaped member 91 whose upper portion has a. threaded rod 98 projecting upwardly therefrom. Clamped upon the rod 98 is a split collar 99 (see Fig. 2) having a threaded bolt portion extending laterally therefrom. Pivotally embracing the bolt |00 is the arm 13 held upon the bolt by means of nuts |0l. The upper end of the spring is suitably secured to the member 91, thus to bias the lever 1| upwardly. The two cup-shaped members 96 and 91'form a substantially airtight unit whose purpose is to dampen the violent spring vibrations which would otherwise occur when the spring 12 passes through its critical phases.

The applied pressure of the spring 12 may be varied by shifting the rod 98 relative to the clamp collar 99, when loosened by means of a stop-nut |02 which is carried by the threaded upper portion of the rod 98. A clamp screw |03 is used for tightening the collar 99 about the rod 98 in the set position of the collar. Pivotally carried by the bolt |00 is the bracket 94 having an inverted U-shaped portion comprising the apertured downturned side pieces |'04 and |05 which embrace the apertured end portion of the arm 13. The nuts |0I and a washer |06 retain the bracket 94 in place on the arm 13. y

The short horizontally disposed portion of the bracket 94 has mounted thereon, by means of nuts |01, a rod |08 the lower end of which has secured thereto the secondary coil spring 93. The lower portion of this spring is formed as a hook |09 which is connected to the rear end of the lever 92 by means of the eye 95. The depending portion or limb of the bracket 94 has pivotally connected to its lower end, by means of a rivet I I0, a steadylink III which has its other end pivotally connected to the rear end of lever 92 by means of a rivet 2.

Referring particularly to Figs. 2 and 10', the fulcrum line 16 of the spring-biased levers 1| and 92 isso located that-the levers are each ofthe rst class; the portion of each lever extending forwardly of the fulcrum line 16 being very much shorter in length than that portion whichv extends `from each. of the respective lever pivot points"at14 and ||2 to thefulcrum line at 16. By means of these leversior multiplying means 1| and 92, the amplitude of vertical movements of both thefeed-bar 41 and the presser-bar 88, is, in leach instance, multiplied by at least five times, thus to impart to each bar a force live times greater than the respective coil springs would impart thereto if they were acting directly upon a respective lever. Thus, a relatively light spring is adequate in each case for supplying the proper pressure to the presser-foot and feed-foot. Tests have proven that byusing such a multiplier, superior results have been attained as compared to the results attained when using the same top feeding and presser elements but with springs each having about ve times the stiffness of the respective springs 12 and 93 and applied to bear directly upon the lever 52 and the bar 88. Apparently there is much advantage to be gained by using a light weight spring coupled with a "multiplier` as compared to using a heavier weight spring which -is applied directly upon the lever 5'2 or upon the bar 88. These tests have shown that the use of the=present multiplier mechanisms completely obviates the tendency of the feet 40 and to flutter when the machine is operating at a high rate of speed. It is an advantage to use a spring having a high natural frequency for this purpose. l

For a more complete explanation of this multiplier action, reference may be had to my U. S.v Patent No. 2,428,762, granted October '1, 1947, and entitled Sewing machine.

The present machine is also provided with manually operable presserand top feed-bar lifting means designed to keep at a minimum the lifting force required. Broadly, these means comprise elements adapted, under treadle-controlled action, to remove completely the tension of each coil springfromthe respective levers and to swing the knife-edge fulcrum member 11 away from the levers 1| and 92 to permit the presserand feed-bars freely to be raised off the work.

In general, the present lifting mechanism comprises a self-contained frame-work I3 carried by the machine bracket-arm I1. Within this frame-work ||3 are mounted two sets of Geneva stopsy ||4 and ||5 geared together in order to provi-de a series of successive motions all produced by a single downward movement of the usual foot-actuated treadle `whichis connected to the Geneva stops by means of a chain ||6 and a pivoted arm ||1, which latter carries a segmentgear ||8.-- Responsive to an initial movement oi the treadle-chainv H6, through the connecting means of the segment-gear H8 and a pinion H9 engaged thereby, the primary Geneva stop lifi raises anarm |20 which actuates a toggle-joint comprising arms |2| and |22 pivotally connected as at |23.v Arms |2| are pivotally carried by the frame-work H3 as atl |24, and the other arms |22 of the toggle-jointare pivotally connected as at |25 to an arm- I26 which in turn is carried pivotally-by the frame-work as at |21. The hereinabove noted arm 13 is integral with arm |26 and therewith forms a bell-crank lever which, under the action of the toggle-joint, swings about its pivot |21- for the purpose of moving the coil springs-12 and 93 into untensioned positions.

At this point in the cycle, the spring pressures are entirely removed from the presser-bar and topfeed-baras may be seen from Fig. 11. Further downward movement of the treadle chain afieaaer y le willv not move the beu-,crane me, 113 and the coil springs 12" and `93; due to the: inherent; lostmotion actiony of the Geneva stop H4; butI the second Geneva stop thenA becomes effective to actuate segment gear |528.; which in turnimparts a forward linear motion toV a horizontally disposed rack-bar |129 slidably mounted within the frame-work ||3 and within a bearing aperture formed in thev head' |9`.

The forward' end portion of this rack |29 engages gear teeth |31 provided on the end portion of the above noted stub-shaft 18 which carries the knife-edge 'I6 and, therefore, the linear-movement imparted to the rackv is eifective to rotate the stub-shaft, thereby to remove the fulcrum point from the spring-biased levers H and 92v for the purpose of providing proper clearance between each of the levers 1| and 92 and the fulcrum so the presser-bar and top feed-bar may be raised freely.

Threaded into the fulcrum-piece Tl' of the stub-shaft 18, at a point eccentric. to the axis of rotation thereof, is a screw |32 ('see' Fig. 7) of which an exposed shoulder portion |33 enters a slot i3d provided adjacent one end portion ofv a sheet metal armV |35, the other endl of which arm is secured :pivotally to the under body of the machine bracket-arm |8 by means of a screw |36. The free end of the arm |35, adjacent the slotted portion thereof is bent to form a lip |31 and underlies the guide-arm 86 carried bythe presserbar 88. The turning motion of the stub-shaft,

therefore, throws the screw |32 in an arcuatepath, thereby raising the free end portion of the sheet metal arm |35 which in turn lifts the presser-bar 88. This upward movement of the presser-bar lifts the top feed-bar 4T through the medium of ringer piece |38l carried' by the guide-arm @t and underlying, atA its lower end, the feed-lift lever 52. A screw |39 secures the finger piece l 38 within an aperture 40 provided in the guidearm 86. Fig'. 12 illustrates this nal step in the cycle.

Upon releasing the manually applied force exerted on the treadle-chain H6, the above described mechanism will return to its normal position under the force of a pair of tension springs Ml which are effective to retension the coil springs 'l2 and 93, as the springs |4|v operate through the medium of the toggle joint, |2|, |22.

For a more complete description of the present type of Geneva stop device, reference may be had to my U. S'. Patent No. 2,430,440, granted November 4, 1947, and entitled Presser-bar mechanism for sewing machines.

From the above description it is to be understood that the levers and 92 each functions to impose upon the respective springs 12 and 93 a range of movement materially greater than that of either the feed-bar 4"'1 or presser-bar 88 respectively. From this it will be understood that for every upward movement made by either the feedor presser-bar, there is applied respectively thereto a quantum of spring-applied force which is greatly in excess of that which would be applied thereto if the springs 'l2 and 93 were each connected directly to the respective bars 41 and 88. Thus it is possible to use a pair of rel'ativelylightweight springs and still have available the requisite amount of spring pressure for efficiently biasing the work-engaging elements toward the work;

Furthermore, the present device, although tted with means for applying heavy spring forces upon the feedand presser-bar, is also equipped with means whereby the: springs may be 8. relaxed preparatory to lifting said bars simultaneously. Y

Having thus set forth the nature of; the invention, what I claim herein is:

I. In a sewing machine, a frame includingl a bracket-arm, a feed-lift arm pivotally carried, upon said bracket-arm, a four-motion upperY feed-foot, means to connect said foot to said arm, a lever pivotally mounted upon said feed-lift arm, means to impart a vibratory motion to said lever, means reacting upon said bracket-arm to arrest the motion of said lever in. one direction thereby to imparta feed-lift motion to said foot, and* means for imparting feed-advance and -return motions to said foot.

2. In a sewing machine, a frame including a bracket-arm, a feed-lift arm pivotally carried uponfsaid bracket-arm, a four-motion upper feedfoot for advancing Work through said machine, means to connect said foot with said arm, spring means for biasing said foot toward the work, a lever pivotally mounted upon said feed-lift arm, means to impart a vibratory motion to said lever, means reacting upon said bracket-arm to arrest the motion of said lever in one direction thereby to impart a feed-liftA motion to said footi inv opposition to said spring means, and means for imparting feed-advance and -return motions to said foot.

3. In a sewing machine, a frame includinga bracket-arm, a feed-lift arm pivotally carried upon said bracket-arm, a four-motion upper feed-foot for advancing work through said machine, means to connect said foot with said arm, a presser-foot slidably mounted' within said bracket-arm, a pair of springs, each spring being adapted for pressing one of said feet toward the work, a lever pivotally mounted upon said feedlift arm, means to impart a vibratory motion to said lever, means reacting upon said bracket-arm to arrest the motion of said lever in onedirection thereby to'impart a feed-lift motion to said feedfoot in opposition to one of said springs, means for imparting feed-advance and return motions to said feed-foot, and a single manually operable means for lifting work.`

4. In a sewing machine, a frame including a bracket-arm, a yoke pivotally carried by said frame, a needle-bar slidably mounted Within said yoke, a bearing member carried rigidly with said yoke, a four-motion feed-bar slidably mounted within said vbearing member, means for rocking said yoke, a feed-lift arm pivotally carried upon saidv bracket-arm, means to connect said feed-bar with said arm, spring means for biasing said foot toward the work, a lever pivotally mounted upon said feed-lift arm, means to impart a vibra-tory motion to said lever, and means reacting upon said bracket-arm to arrest the motion of said lever in one direction thereby to impart a feedlift motion to said feed-bar in opposition to said spring means.

5. In a sewing machine, a frame including a bracket-arm, a feed-lift arm pivotally carried upon said bracket-arm, a four motion upper feedfoot for advancing work through said machine, means to connect said foot with said arm, a spring for pressing said feed-foot toward ysaid work, means comprising a lever of the first order interposed between said spring and said feedfoot for imposing upon saidspring a range of movement materially longer than that of said feed-foot, a lever pivotally mounted upon said feed-lift arm, actuating means for impartingv a both of said feet off the- `vibratory inotin to said latter lever, means' adapted to arrest the motion of said latter lever in one direction so that continued operation of said actuating means in one direction will impart a feed-lift motion to said foot in opposition to lsaid spring, and means for imparting feed-advance and -return motions to said foot,

y 6. In a sewing machine, a frame including a bracket-arm, a feed-lift arm pivotally carried upon said bracket-arm, a four-motion upper feedfoot for advancing work through said machine, means rto connect said foot with said arm, a lever having one end thereof operatively associated with said arm, a spring connected tothe other end of said lever so as to force said foot against the work, a fulcrum member cooperatively associated with said lever and in engagement therewith at a point adjacent the arm for multiplying the applied force of said spring and for applying the resultant upon said foot, a bellcrank lever pivotally mounted upon said feed-lift arm, means to impart a vibratory motion to one limb of said bell-crank lever, means reacting upon said bracket-arm to arrest the motion of the other limb of said bell-crank lever in one direction thereby to imparta feed-lift motion to said foot in opposition to saidspring, and means for imparting feed-advance and -return motions to said foot.

'7. In a sewing machine, a frame including a bracket arm, a yoke pivotally carried by said bracket-arm, a needle-bar slidably mounted within said yoke, a bearing member carried rigidly with said yoke, a four-motion feed-bar slidably mounted within said bearing member for feeding work through said machine, means for rocking said yoke, a feed-lift arm pivotally carried at its one end upon said bracket-arm, means to connect said feed-bar with the other end of said arm, a spring for pressing said feed-bar toward the work, means comprising a lever of the first order interposed between said spring and said feed-bar for imposing upon said spring a range of movement materially longer than that of said feedbar, a bell-crank lever lpivotally mounted upon said feed-lift arm, means to imparta vibratory motion to one limb of said bell-crank lever, and means reacting upon said bracket-arm to `arrest the motion of the other limb of said bell-crank lever in one direction thereby to impart a feedlift motion to said feed-bar in opposition to said spring.

8. In a sewing machine, the combination of a plurality of work-engaging feet, a plurality of springs, each spring being adapted for pressing a respective one yoi said feet toward the work, means interposed in operative relation between each of said springs and its associated foot thereby to impose upon each spring a range of movement materially longer than that of its respective associated foot, and intermittently effective lifting means for one of said feet, said lifting means being adapted to lift said foot against the force of its associated spring.

9.V The combination in a sewing machine having a frame including a work-support, apresserfoot carrying bar, a feeding-foot carrying bar, vmeans forr endwise reciprocating and laterally jogging said feeding foot carrying bar, a pair of springs, -each spring. being adapted for pressing a respective one of said carrying bars toward the work, means interposed between each of said springs and its associated carrying bar for multi- -plying the applied force of each spring' and applying the resultant upon' a respective oneof'said l0 carrying bars, and a single manually operable means for lifting both carrying bars away from thework.

10. In a sewing machine, the combination of a plurality of work-engaging feet, a plurality of springs, each spring being adapted for pressing a respective one of said feet upon the work, means comprising a lever of the first order` interposed between each of said springs and its associated foot for imposing upon each spring a range of movement materially longer than that of'its associated foot, and a single manually operable means for lifting all of said feet vawayfrom the work..

1:1.. In a sewing machine, the combination of a plurality of work-'engaging feet, a plurality of coil-springs, each coil-spring being adapted for pressing a respective one of said feet upon the work, a; plurality of relatively stiff levers of the .rst order, each lever having one end thereof operatively connected to a respective one of said feet and the other end thereof operatively connected to a respective one of said coil-springs, each lever being'adapted to impose upon its associated coil-spring a range of movement materially longer than` that of its associated foot, intermittently effectivey lifting means for one of 'said feet, said lifting means being adapted tolift its associated foot against the force of its associated coil-spring, and a single manually operable .means for lifting all of said feet away rfrom the work. 4 Y

12. The combination in a sewing machine having a frame'i'ncluding a work-supporta reciprocatory presser-foot carrying bar, a feeding-foot carrying bar mounted for endwise reciprocatory and laterally jogging work-feeding movements, a pair of springs, each Yspring being adapted for biasing a respective Ione of said bars toward said Work-support, means comprisinga motion-multiplying member interposed between. each of said springs and'its associated bar for imposing upon each spring a range of movement materially longer than that of its associated bar, intermittently effective lifting meansfor lifting said feedingfoot carrying bar Iaway from said work-support against the force of its associated spring, means for removing the force of each of said springs from its associated bar, and manuallyA operable means for shifting said bars away from said ,work-support.

13. In a sewing machine, the combination of a plurality of work-engaging feet, a plurality of springs, each spring being adapted for pressing a yrespective one of said feet upon the work, means comprising va lever of the rst order interposedbetween each of said springs and its associated Vfoot for imposing upon each spring a range of movement materially longer than that of its associated foot, manually operable means to relax said springs thereby to remove the force thereof from each of sai-d feet, and means operable upon relaxing of said springs for shifting said feet -away from the work.

11 mittently operable lifting means for lifting said feeding-foot 'carrying bar away from said worksupport against the force of its associated spring, fm'anually operable means to relax said springs thereby to remove the force thereof from each of said bars, and means operable upon relaxing "of said springs for shifting said bars away Afrom y'said work-support.

i5. In a sewing machine, the combination of a plurality of work-engaging feet, a plurality of springs, each spring being adapted for pressing a respective one'of said feet upon the Work, means Acomprising a lever of the first order interposed between each of said springs and its associated Vfoot for imposing upon each spring a range of movement materially longer than that of its associated ioot, and manually operable means upon the movement of which the force of each of said springs is 'removed from each of said feet and upon the further movement of 'which lall of said feet are shifted away from said work.

'16. The combination in a sewing `machine having ia frame including a work-support, a recipro- 'catory presser-foot carrying bar, a feeding-foot carrying bar mounted for endwise reciprocatory and laterally jogging work-feeding movements, a 'pair of springs, each spring being ladapted for vbiasing `a respective one of said bars toward said Work-support, means comprising a motion-multiplying member interposed betwen each of said springs and its lassociatedb'ar yfor imposing upon each spring a range of movement materially longer than that of its `associated ban-intermittently veffective lifting means for lifting said feed- `ing-foot `carrying bar away-from said work-support against the force of its associated spring, a 'first means to remove the force of each of said 'springs from itsassociated carrying b-a-r preparatory to 'shifting `the same, and means `actuated by said iirst means for shifting each of said carrying Abars away from said Work-support upon the removal of said spring forces lfrom said 'earrying bars.

l17. In a 'sewing machine having Va, Work-support,` 'the combination of a plurality of work-en- -gaging "feet, a plurality of levers, each of 'said 'levers having its'one end portionthereof in operative engagement with `a "respective one of said work-engaging feet, fulcrum mean-s `in engagement with an intermediate portion of each lever, "aplurality of springs, each spring being in engagementwith the'other endportion of a respectiveone of said levers and beingeilective to bias thefoot associated therewith toward said worksupport,'means to remove the force of raid springs from saidl feet, and means operable uponthe removal of said spring forces from said feet for -ltermediate portion of each leverfa pair of springs, VfeaCms'prin'g beingin engagement lwith -the' other 'endportion of a respective one of said levers and `being leffective tobias the foot associate-diners- With toward said work-support, means "forremoving the forceoi eachoi Asaidsprings from saidwfeet preparatory toshifting' saidf feet, means -rfor movingsaidfulcrum'means outof Yengage- `nin-nt `with said vlevers, and means vfor shifting `-said feetaway from said work-support *19. The'combi'nation in a sewing machine having a frame including a work-support, ta ,pair v"of workeengaging feet, a .pair of levers, vea'cli 'of said levers having its one end portion thereof in operative engagement with a respective Aone 'of fsai'd feet, fulcrurn means i'n engagementwith an intermediate Vportion of each lever, 'a pairoi springs, each spring being in engagement with the other end portion of a respective one of said leversand being leiiective to bias the foot associated therewith toward said work-support, a'rst means for moving said fulcrum 'means 'out A'of engagement with said levers preparatory to shifting-said ffeet, and means actuated by said rst means for shifting 'said feet away from said workssupport.

l20. The combination in a sewing machine 'having a frame including a work-support, 'a pair of work-engaging feet, a pair of springsjeach spring being adapted for pressing `a respective one of said feet toward said work-support and lhaving one end thereof secured to a single normally stationary member, means interposed in voperative relative -between each of said springs andits associated foot whereby each spring-'is given a range of 'movement materially longer than that o'i' 'its respective associated -foot, means for shifting said normally stationary member 'therebyto #relax the force of each of said springs, and'meansiactuated by said last mentioned means `for-liftings'aid feet away from said work-support. Y

21. The combination in-a sewing-'machine having a frame including a Work-support, `an 'upper Vfeed-foot, an upper lfeed-bar carryin'gsaid feedfoot, a presser-foot, a presser-bar carrying said presser-foot, a pair of coil-springs, 'one'of said coil-springs being adapted `to maintain lsaid press er-foot continuously in engagement with 'the worl,"the other of said 'coil-springs beingfadapted Ito press said feed-foot toward the work, Lintermittently effective lifting means -for 'lifting said feeding foot 01T the work 'againstthe f'orceo'f 'its associated coil-spring, a 'pair of 'relatively stiilz levers, each lever having one end thereofioperatively connected to'a respective oneoi` v vsaidbars and the other end thereof 'connected operatively to a respective one of said coil-springafand'fulvcrum 'means in engagement with -e'ach 4l'everfso :that each lever will multiply the Iapplied`iof'1-c'e of its associated Acoil-spring and 'apply the Y'rey sultant upon its'asso'ciated bar.

22. The combination in a se'wingimaehinelhaving afra'me including a work-support'la'n:upper feed-foot, an upper feed-bar carrying said ffe'edfoot, a presser-foot, apresser-bar/carrying said 'presser-foot, a pair of coil-springs,fa`singlem'ember for supportingboth of said coi1-springs,one

of said vcoil-springs being adapted tofrnaintain 'tively Vstiil levers, each lever havingpne end thereof operatively connected -to'falespectivelone of said bars land the other fendtliereo connected operatively to 'a respective "one of said "coilsprings, a single 'f fulc'rum means' infenga'gemerit with vboth of said'levers so that'each'leverwili multiply the applied forcev of `its associated' coilspringand apply the resultantl upon' its associated bar, lmanually operable y*means 4conn'ec'ted -with said single member forfmovingtheffsametinfa `direction such as to relax saidsprins: and means opera'ble upon relaxing #sai-d springs for'vshifting 1 saidr feetf'away-from said work=sl`lpport.

23. The combination in a sewing machine having a frame including a work-support, an upper feed-foot, an upper feed-bar carrying said feedfoot, a presser-foot, a presser-bar carrying said presser-foot, a pair of coil-springs carried by said frame, one of said coil-springs being adapted to maintain said presser-foot continuously in engagement with the Work, the other of said coilsprings being adapted to press said feed-foot toward the Work, intermittently effective lifting means for lifting said feeding-foot off the Work against the force of its associated coil-spring, a pair of relatively stii levers, each lever having one end thereof connected operatively to a respective one of said bars and the other end thereof connected operatively to a respective one of said coil-springs, fulcrum means in engagement With both of said levers so that each lever Will multiply the applied force of its associated coilspring and apply the resultant upon its associated bar, manually operable means to relax each of said coil-springs preparatory to shifting said feet, means for moving said fulcrum means out of engagement with said levers, and means for shifting said feet away from said Worksupport.

FREDERECK F. ZEIER.

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