US2291129A

US2291129A - Feeding mechanism for sewing machines

Info

Publication number: US2291129A
Application number: US332441A
Authority: US
Inventors: Frederick F Zeier
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1939-04-15
Filing date: 1940-04-30
Publication date: 1942-07-28
Anticipated expiration: 1959-07-28
Also published as: US2325928A; US2266140A; CH254773A; US2317240A; GB539249A; GB535543A; GB537161A; FR868565A

Description

y 1942 F. F. ZEIER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 1939 4 sh t sh t 1 redere jeier July 28, 1942. ZE|ER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 19:59 4 Sheets sheet 2 awe/whom $7 edem'ek @jeiev July 28, 1942; ZE|ER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 1939 4 Sheets-Sheet 3 arvucwvtcvv @Pedem'e jez'er July 28, 1942. ZE|ER 2,291,129

FEEDING MECHANISM FOR SEWING MACHINES Original Filed April 15, 1959 4 Sheets-Sheet 4 aux 00mm rederclg 6258i Patented July 28, 1942 FEEDING MECHANISM FOR SEWING. MACHINES Frederick F. Zeier, Fairfleld. Conn asaignor to,

The Singer Manufacturin g Company, Elizabeth, N. J., a corporation of New Jersey Original application April 15, 1939, Serial a... 267,958. Divided and this application April 30, 1940, Serial No. 332,441

12 Claims. (Gl. 112-207) This invention relates to sewing machines of the straightaway feed type and it has for its primary object the provision of an improved workfeeding mechanism designed and actuated so that the superimposed plies of material are each fed through the sewing machine at the same rate and without any relative movement of the plies of material during the feeding thereof.

Another object of the invention is to provide a feeding mechanism of the above type wherein the feed-bar supporting the usual-feed-dog and the Dresser-bar supporting the usual presserfoot are actuated by connections designed and arranged to eliminate side-thrusts between the feed-bar and presser-bar in their respective bearings, thereby enabling the feeding mechanism to be operated at a comparatively high rate of speed.

With these and other objects in view which will more fully appear, the nature of the invention will be more clearly understood byfollowing the description, the appended claims, and the several views illustrated in the accompanying drawings.

In the drawings:

Fig. 1 is a front side elevation of a. sewing main a head 4. Journaled in suitable'bearings in the bracket-arm 3 is a rotary mainor arm-shaft 5 having fastened thereon'at one end a counterbalanced crank 6 connected by a link I to a reciprocatory needle-bar 8 carrying at its lower end an eye-pointed needle 9. At the standardend of the machine the arm 'shaft 5 has secured thereto a balance-wheel I having formed therein a, belt-groove ll adapted to receive a belt (not shown) actuated by any suitable power source.

Jcurnaled in bearings in the bed I is a rotary bed-shaft l2 connected to be rotated at a oneto-one ratio from the arm-shaft by a conventional clip-belt l3 operating within a belt-compartment M in the standard 2. Adjacent the head-end of the machine, the rotary bed-shaft i2 is connected by a suitable linkage to a. chainstltch looper l5 which is of the threaded twomotion type and is adapted to be oscillated in a vertical plane parallel to the direction of feed, the loop-seizing motion being in a direction opposite to the direction of feed of the work through chine embodying the invention, with portions of the bracket-arm and bed in section to show the internal mechanism.

Fig. 2 is a rear side elevation of the sewing machine.

Fig. 3 is a front end elevation of the sewing machine with the bed, in section.

Fig. 4 represents a vertical sectiontaken substantially along the line M, Fig. 3.

Fig. 5 is a detail view in elevation of the reedframe in which are journaled the reciprocatory needle-bar and the feed-bar. I

Fig. 6 is a top plan sectional view of the frontend portion of the bracket-arm, illustrating the internal mechanism.

Fig. 7 represents a horizontal section through the head of the machine taken substantially along the line Ii, Fig. 3.

h This application is a division of my copending application Serial No. 267,958, filed April 15, 1939.

The general constructive features of the sewing machine chosen for illustration of the present improvement are described in detail in the above mentioned pending application, and in this application only such reference will be made to the various elements of the machine as will assist in'a. clear understanding of the present invention.

The sewing machine comprises a frame having a bed i from one end of which rises a standard the machine. The looper actuating linkage is fully illustrated and described in my copending application above referred to and, therefor, need not be described further herein. To assist in stitch-formation, the two-motion looper l5 has cooperating therewith a spreader i8 which is adapted to engage one limb of the looper-threadloop on the looper to distend the same and form the usual thread-triangle with the previous needle-thread-loop which is about the blade of the looper for entrance by the descending needle 9. The spreader it is reciprocated horizontally crosswise of the vertical plane of movement of the looper it by a supporting shaft l'i (Fig. i) endwise movable in its bearing-bushing it through connections operated by an eccentric to fixed to rotate with the bed-shaft i2.

Located beneath the cloth-plate 20 on the bed i is preferably a lower four-motion feeding mechanism which operates in synchronism with the top-feed later to be described. This four-motion feed (Fig. 3) preferably comprises a feed-advance and -return rock-shaft 2i and a feed-lift rockshaft 22 disposed on opposite sides of the bedshaft l2. shaft 2! is joumaledin suitable bushings in the machine-bed i and has clamped upon the inner end thereof a depending rock-lever 23, the lower end of which is connected by a pitman 2am an,

- adjustable eccentric 25 upon the bed-shaft i2.

2 of an overhanging bracket-arm 3 terminating The elements of the eccentric 25 are identical with the eccentric disclosed in the United States patent to W. Myers, No. 2,128,031, dated Aug. 23,

The feed-advance and -retum rock 1938. Secured by screws 28 upon the outer endportion of the rock-shaft 2| is the usual upstanding feed-rocker 21 carrying at its upper end a hollow fulcrum-bar 28 held against endwise displacement by the cap-screws 28 threaded into the feed-rocker 21. Journaled upon the fulcrumbar 28 is the bifurcated end of a feed-bar 88 formed with a guideway 3| (Fig. 3) entered by the shank of the lower feed-dog 82. Formed in the feed-dog 82 is a needle-aperture 88 which is adapted to receive the needle 8 and back up the same during feeding of the work.

The feed-lift rock-shaft 22 is supported at its opposite ends by suitable pintles fixed in the bed I. Depending from the inner end of the feed-lift rock-shaft 22 is a rock-lever 34 whose lower end is connected by a short pitman 88 actuated by an eccentric 38 fastened upon the bed-shaft I2. Extending horizontally and forwardly from theouter end of the feed-lift rock-shaft 22 is a rocklever 31 (Fig. 3), the free end of which is connected by the parallel depending links 88 to the free end of the feed-bar II.

It will be understood from the above description that the feed-dog 82 has imparted to it the usual four motions necessary to feed the work through the machine, and that the extent of the feed-advance of the work per needle reciprocation can be controlled by the adjustable eccen trio 2!.

Referring now to the mechanism above the bed I and within the bracket-arm 8 and head 4, the needle-bar 8 is journaled for endwise reciprocation in the two spaced

lugs

38 and 48 formed on a vibratory frame 4I pivotally hung at its upper end upon a stud 42 secured by screws 48 in the top of the head 4. i The lower end of the vibratory frame 4I is steadied in its movement in the line of feed by an L-shaped bracket 44 which is secured by screws 45 to the machine-head 4. The needle 8 is adapted to be vibrated in the line of feed in timed relation with the various feeding elements, and to this end there is provided on the arm- 'shaft 5 an adjustable eccentric 48 connected to the vibratory frame 4| by means clearly disclosed in Figs. 2, 3 and 6. Referring particularly to Figs. 2 and 6, it will be observed that embracing the eccentric 48 is a short rearwardly extending pitmanilconnected to the upper end of a vertically disposed rock-lever 48 clamped at its lower end upon the end of a feed-advance rockshaft 48 journaled in spaced lugs 88 on the rear wall of the head 4. Pinned upon the other end of the rock-shaft 48 is the upper end of the depending rock-lever 8| connected at its lower end by a horizontal link 82 to a split projection ll, see Fig. 5, formed upon the vibratory frame 4 I.

To provide for changing the amplitude of vibration of the needle, 1. e., to change the length of stitch, provision must be made to permit adjustment of the amount of vibratory movement imparted to the needle. In the present case, the eccentric is constructed so that itseccentricity may be conveniently adjusted laterally of the arm-shaft 5 to give the desired stitch-length. To assist in effecting adjustment of the eccentric 48, there is provided in the top of the bracketarm 8 a detent 84 which is adapted to be depressed by the operator and to enter a suitable stop-notch in the adjusting member of the eccentric 48, permitting the operator to turn the balance-wheel I8 and adjust the eccentricity of the eccentric. For a complete disclosure of the detent 84, reference may be had to the U. 8. petent to W. Myers, No. 2,063,264, dated Dec. 8, 1936.

In a machine having an upper feeding mechanism and a lower feeding mechanism, each deriving its work-advancing movements from independent adjustable eccentrics, means must be provided to enable the two feeding mechanisms to remain in unison during the adjustment of the stitch-length. The means employed in the present machine is identical with that shown and described in my copending application, Serial No. 267,958, of which this is a division, and for a detailed description of such means reference may be had to the above mentioned pending application.

Considering now the upper four-motion feeding mechanism which assists the needle in advancing the work and is designed to cooperate with the presser-mechanism, the upper feeding mechanism comprises a feed-dog 88 carried in the usual way upon the lower end of a feed-bar 88 slidable in a vertical dovetailed guideway ll formed in the vibratory frame 4|. From Figs. 4 and 5, It will be observed that in order to take up wear, and also to facilitate manufacture, one side of the dovetailed guideway 81 is in the form of a detachable gib 88 secured by screws 88 threaded into the vibratory frame 4 I.

Disposed adjacent the feed-dog 88 is a presserfoot 88 attached to the lower end of an endwise movable presser-bar 8| journaled in a fixed bushing in the head 4 of the machine. Clamped upon the upper end of the presser-bar 8| is a horizontal guide-arm 82, Fig. 7, the free end or which is adapted to enter the usual presser-bar guideslot 88 provided in the rear wall of the machinehead 4. This guide-slot 88, in the present case. is preferably formed of two parallel

hardened steel runners

84 and 88 secured one upon the outside of the wall of the machine-head 4 and the other upon the inside of the wall of the machine- 'head by

screws

88 and 81.

' upper end of the feed-bar 88, and the pin II is connected by a depending link 18 to a lifting pin 14 carried by the presser-bar guide-arm 82. The upstanding limb of the angle-lever 88 is connected by the curved link 18 to the slotted rocklever I8 pinned upon one end of a feed-lift rockshaft 'I'I journaled in a lug I8 integral with the rear wall of the machine-head 4. Clamped upon the other end of the feed-11ft rock-shaft I1 is the upstanding rock-lever I8, the upper end of which is connected by a pitman 88 actuated by an eccentric 8| secured upon the arm-shaft 8.

Referring to Figs. 3 and 6, it will be seen that the free end of the arm 88' provides a floating fulcrum for the inverted T-shaped angle-lever 88, and that its turning movements are about the axis of the rock-shaft 48 upon which it is freely journaled. The provision of the floating fulcrum for the angle-lever 88 in combination with the two links I2 and I8 connecting the anglelever to the upper ends of the feed-bar 88 and presser-bar 8| makes toward a top-feed mechanism wherein the necessary actuating movements may be transmitted to the respective elements without undue binding or side-thrust between the feed-bar 58 and the presser-bar M with their respective bearing surfaces. The elimination of this reaction permits the operation of the topfeed at a higher rate of speed with a minimum of spring-pressure. The arm 89 and the mechanism connected thereto are depressed into contact with the work preferably by a leaf-spring 82 of which the innerv end projects through a clearance opening I!" in the head 4. This inner end is slightly concaved and engages the semispherical head of the screw t8 projecting up wardly from the free end of the'arm 69'. The

other end of the leaf-spring I2 is apertured to receive the retaining pin it of the lug 85, and intermediate the ends of the leaf-spring there is provided an adjusting screw 86 for regulating the amount of pressure applied by the spring.

Considering the top feeding mechanism in the position illustrated in Fig. 3, the operation thereof is as follows: Rotation of the arm-shaft i imparts to the angle-lever 88, through the eccentric ti and the connections actuated thereby, a constant oscillatory motion about the axis of the fulcrumpin 69. when the presser-foot OI engages. the worker the throat-plate as shown in Fig. 3, and the rock-lever I8 moves in a clockwise direction about the axis of the feed-lift rock-shaft II, the pin II. of the angle-lever I becomes the pivotpoint about which the angle-lever turns. Further movement of the rock-lever It in the same direction (clockwise) raises the feed-bar 58 through the link I2 and also elevates to a small extent the spring-biased end of the arm 89'. When the feeddog 55 carried by the feed-bar 58 is thus lifted from the work, the needle 9 also being out of the work, the vibratory frame ll, which, carries the needle-bar 8 and the feed-bar 56, is shifted to the right through vibration of the rock-lever ll Fig. 3, or, in other words, given its feed-retum movement. At the end of this feed-return movement, the oscillation of the rock-lever I5 in a counterclockwise direction causes a turning of the angle-lever 68 about the pivot-pin 89 in a clockwise direction, which results in a lowering of the feed-dog 55 into contact with the work. in which position the pin 'Ili carried by the angle-lever 88 becomes the pivot-point about which the anglelever turns. Further movement of the rock-lever I8 in the counterclockwise direction raises the presser-bar 6] through the link I3. When the presser-foot is thus raised from the work, the vibratory frame I carrying the needle-bar 8 and the feed-bar 56 has imparted to it, through its actuating connections previously described, the feed-advance movement. In the machine chosen for illustration, this sequence of operations is repeated in timed relation with the lower fourmotion feed previously described. In order that the amount of elevation of the presser-foot and feed-dog may be varied to compensate for the different thicknesses of materials sewn, the rock-lever It is slotted, as at It, and has adjustably clamped thereto the curved link I5. Adjustment of the end of the link I5 in the slot It varies the amount of oscillation imparted to the angle-lever 68 which controls the height to which the presser-foot 66 and feed-dog 55 are raised.

From Figs. 1 and 3, it will be seen that in order to obtain a comparatively long stitch, the feed: bar 56 is spaced to the left of the vertical plane containing the longitudinal axes of the needlebar 8 and the presser-bar SI, and also rearwardly of the needle-bar 8 so that the feed-bar 5t can k 3 move ackwardly during the feed stroke to a positio substantially at the side of the presserbar 8|. With the view of obtaining a more smoothly acting top feeding mechanism, and to minimize the endwise movement of the feed-bar 56 in its

bearings

89 and 40 during the vibration of the. frame II, the axis of the stud 42 upon which theframe is pivotally hung is in a plane which lies substantially midway between-the longitudinal axes of the feed-bar 56 and the needlebar 8, see Fig. 3.

From the above description, it will be understood that I have invented a top feeding mechanism which. in its operation, is exceedingly flexible and capable of a high speed of operation. Moreover, since only a relatively smallspring pressure is required to maintain the presser-foot or feed-dog in contact with the upper surface of the work, the top-feed may be operated at a high speed without the excessive pounding of the feeddog or presser-foot on the work-support, which heretofore has been present in other top feeding mechanisms. While in the present disclosure the top-feedis shown in combination with a lower four-motion feed. it is to lie-understood that the top-feed may be used by itself or with any other type of lower feed, such as a wheeli'eed or a puller-feed.

The presser-foot 60 and the top feed-dog 55 are adapted to be raised either by the usual handcontrolled lifting lever or by kneeor foot-operated mechanism. The preferred form of handcontrolled lifting lever comprises a rearwardly extending lever 81 provided with a handle 88 at its free end, and at its other end with a relatively long hub 89 formed with a lifting cam 90. As the lever 81 is raised, the lifting cam 90 engages under the presser-bar guide-arm 62 which is clamped upon the presser-bar 6|, thereby elevating the presser-footfrom the work. The raising of the presser-bar guide-arm 62 transmits a lifting force through the link It and the anglelever 68 of the top feeding mechanism to the free end of the arm 69', which causes the same to turn in a counterclockwise direction about the rock-shaft 49 in opposition to the leaf-spring 82. The turning of the arm 69' in a counterclockwise direction obviously elevates the top feed-bar 58 which is connected to the arm 69' through the link I2 and the angle-lever 68. From the above it will be understood that a raising of the lever 81 will elevate both the presser-foot 60 and the feed-dog 55.

The presser-bar guide-arm 62 is clamped upon the upper end of the presser-bar Si by a lifting pin I4, the inner end of which is received in a vertically disposed clearance slot 9i formed in the lower end of a link 92 connected at its upper end to the horizontal arm '93 of a bell-crank lever pivoted upon a fulcrum-stud 9t projecting from the rear wall of the machine-head 4. Fastened upon the upstanding arm 95, which forms the other limb of the bell-crank lever, is a comparatively long wire link 95 secured at its other end to a second bell-crank lever 97 connected by a chain 98 to a common form of knee-shift or treadle .device.

The hand-controlled lifting lever 81 can be actuated independently of the kneeor footoperated mechanism for a major portion of its arc of movement by virtue of the clearance slot 9| formed in the link 92. It will be appreciated that a raising of the hand-controlled lever 81 the clearance slot, without imparting any movement to the knecor foot-operated mechanism until the pin engages the upper end of the slot 9|. In order to maintain the link 02 in its lowest position, the arm II of the bell-crank lever has bearing against it a spring I. which is coiled about and secured to the fulcrum-stud, ll of the bell-crank lever.

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

1. In combination. in a sewing machine having a frame including a work-support; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; a fulcrum-arm having a free end; a lever pivotally mounted upon the free end of said arm; means for oscillating said lever; a link connecting said lever with said presser-foot carrying bar; a second link connecting said lever with said feeding-foot carrying bar; and spring means eiIective for yieldinglyurging said presser-foot carrying .bar and said feeding-foot carrying bar toward said work-support.

2. In combination, in a sewing machine having a frame including a work-support; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; an oscillatory lever; a freely turnable fulcrumarm pivotally supporting said oscillatory lever and providing a floating fulcrum therefor; means for oscillating said lever; means for connecting said oscillatory lever to said presser-foot carrying bar and to said feeding-foot carrying bar; and spring means acting upon said oscillatory lever for yieldingly urging said presser-foot carrying bar and said feeding-foot carrying bar toward said work-support.

3. In combination, in a sewing machine having a frame including a work-support and a bracketarm; a reciprocatory presser-foot carrying bar journaled in said bracket-arm; a vibratory frame pivoted upon said bracket-arm; an endwise reciprocatory needle-bar journaled in said vibra tory frame; a feeding-foot carrying bar also iournaled in said vibratory frame; means for alternately raising and lowering said pres'ser-foot carryingbar and said feeding-foot carrying. bar including an oscillatable lever; means providing a floating fulcrum independent of said presserfoot carrying bar for said oscillatable lever; and means for yieldingly urging said presser-foot carrying bar and said feeding-foot carrying bar toward said work-support.

4. In combination, in asewing machine having a frame including a work-support; a reciprocatory' presser-foot carrying bar; a feeding foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; a plural-armed lever;means for oscillating said plural-armed lever; a freely turnable fulcrumarm pivotally supporting said plural-armed lever at the Junction of its arms and providing a floating fulcrum therefor; a link connecting one of the arms of said lever with said presser-foot carrying bar; a second link connecting another of the arms of said lever with said feeding-foot carrying bar; and a spring adapted to apply a downward pressure upon said plural-armed lever at substantially the Junction of its arms for yieldingly urging said presser-foot carrying bar I and said feeding-foot carrying bar toward sa work-support.

5. The combination in a sewing machine having a frame including a work-support; a reciprocatory presser-foot carrying bar; a feedingfoot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; an oscillatory lever; means independent of said preser-foot carrying bar for pivotally supporting said lever; means for oscillating said lever about its supportingpivot; a link connecting said lever with said presser-foot carrying bar; a second link connecting said lever with said feeding-foot carrying bar; and spring means effective to yielding y urge said presser-foot carrying bar and said feeding-foot carrying bar toward said work-support.

8. The combination in a sewing machine having a frame including a work-support and a bracket-arm; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; a rock-shaft journaled in said bracket-arm; means for actuating saidrock-shaft; a fulcrum-arm freely iournaled upon said rock-shaft and pivotally supporting at its free end an oscillatory lever; means for actuating said ouillatory lever about its supporting pivot; means connecting said oscillatory lever with the respective upper ends of thepresserfoot carrying bar and the feeding-foot carrying bar; and spring means eifective to yieldingly bias said presser-foot ca ryin bar and said feedingfoot carrying bar toward said work-support.

7. The combination in a sewing machine having a frame including a work-support and a bracket-arm; an actuating shaft Journaled in said bracket-arm; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; a feed-advance rock-shaft journaled in said bracket-arm and actuated by an eccentric on said actuating shaft; means operatively connecting said feed-advance rock-shaft to vibrate laterally the feeding-foot carrying bar; a fulcrum-arm freely iournaled on said feed-advance rock-shaft and pivotally supporting at its free end an oscillatory lever; means for actuating said oscillatory lever about its supporting pivot; means connecting said oscillatory lever with the respective upper ends of the presser-foot c rrying bar and the feedingfoot carrying bar; and spring means effective to yieldingly bias said presser-foot carrying bar and said feeding-foot carrying bar toward said work-support.

8. In a sewing machine, the combination with a frame including a work-support and a bracketan actuating shaft journaled in said bracket-arm; a feed-advance rock-shaft Journaled in said bracket-arm at one side of the vertical plane containing the longitudinal axis of said actuating shaft and operated by an eccentric on said last mentioned shaft; an endwise reciprocatory presser-foot carrying'bar; an endwise reciprocatory and a laterally vibratory feeding-foot ca yin bar; means operatively connecting said feed-advance rock-shaft to vibrate said feeding-foot carrying bar in the line of feed; a fulcrum-arm freely journaled upon said feedadvance rock-shaft and pivotally supporting at its free end an oscillatory lever; a feed-lift rockshaft spaced from said feed-advance rock-shaft andoperated by a second eccentric on said actuating-shaft; means connecting said feed-lift rock-shaft to turn said oscillatory lever about its supporting pivot; links connecting said oscillatory lever to the respective upper ends of the presser-foot carrying bar and the feeding-foot carrying bar; and a spring eflective to yieldingly bias said presser-foot carrying bar and said feeding-foot carrying bar toward said work-support.

9. A sewing machine having, in combination, a frame including a work-support and an overhanging bracket-arm; a reciprocatory presserfoot carrying bar joumaled in said bracket-arm; a vibratory frame pivotally hung at its upper end upon said bracket-arm; a needle-bar and a feeding-foot carrying bar each joumaled for endwise reciprocatory movements in said vibratory frame, and each spaced a substantially equal distance from a vertical plane passing through the point of pivotal support of said vibratory frame; means for actuating said vibratory frame in the line of feed; means for alternately raising and lowering said presser-foot carrying bar and said feedingfoot carrying bar including an oscillatable lever; means including a freely fulcrumed arm providing a floating fulcrum for said oscillatable lever; and spring means engaging said freely'fulcrumed arm for yieldingly urging said presser-foot carrying bar and said feeding-foot carrying bar toward said work-support.

10. A sewing machine having, in combination, a frame including a work-support and an overhanging head provided with a clearance opening therein; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; an oscillatory lever disposed above the upper ends of said presserfoot carrying bar and said feeding-foot carrying bar; a freely turnable fulcrum-arm pivotally supporting said oscillatory lever and providing a floating fulcrum therefor; means for oscillating said lever; links for connecting said oscillatory lever to said presser-foot carrying bar and to said feeding-foot carrying bar; and a leaf-spring extending through the clearance opening in said overhanging head and acting upon said oscillatory lever for yieldlngly urging said presserfoot carrying bar and said feeding-foot carrying bar toward said work-support.

11. The combination in a sewing machine having a frame including a work--support and a bracket-arm terminating in a head; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar mounted for endwise reciprocatory and laterally vibratory work-feeding movements; a substantially horizontally disposed fulcrumarm pivotally sustained by said bracket-annhead; an oscillatable lever journaled for turning movements on said horizontally disposed fulcrumarm; means for oscillating said lever; means connecting said lever with said presser-foot carrying bar and with said feeding-foot carrying bar; and spring means effective for yieldingly urging said presser-foot carrying bar and said feeding-foot carrying bar towards said work-support.

12. The combination in a sewing machine having a frame including a work-support and a bracket-arm; a reciprocatory presser-foot carrying bar; a feeding-foot carrying bar supported for endwise reciprocatory and laterally vibratory work-feeding movements; an oscillatable lever; means independent of said'presser-foot carrying bar for providing a floating fulcrum for said lever about which the latter is oscillated; means for oscillating said lever; means connecting said oscillatable lever to said presser-foot carrying bar and to said feeding-foot carrying bar; and spring means for yieldingly biasing said feeding-foot carrying bar and said presser-foot carrying bar toward said work-support.

FREDERICK F. ZEIER.