US2583735A - Sewing machine - Google Patents

Description

R. A HAYES SEWING MACHINE Jan. 29, 1952 6 Sheets-Sheet l F'iled July 29, 1950 NW o /mm hm wm Om mm mm 3 N INVENTOR. I g ROBERT A. HAYES ATTORINEY.

Jan. 29, 1952 R A ES 2,583,735

SEWING MACHINE Filed July 29, 1950 6 Sheets-Sheet 2 FIG. 2

I l l Q m \w 1 I m (D o3 q- M r ZNVENTOR.

'* 8 ROBERT A. HAYES 1" i I N m m ATTORNEY.

R. A. HAYES SEWING MACHINE Jan. 29, 1952 6 Sheets-Sheet 5 Filed July 29, 1950 35 INVENTOR.

I ROBERT A. HAYES /ZA C, W

ATTORNEY.

R. A. HAYES SEWING MACHINE Jan. 29, 1952 6 Sheets-Sheet 4 Filed July 29, 1950 lllllllll" g INVENTOR.

ROBERT A. HAYES BY jv-C'. M4

ATTORNEY.

Jan. 29, 1952 R. A. HAYES 2,583,735

SEWING MACHINE Filed July 29, 1950 6 Sheets-Sheet 5 I o F G 8 O 73 74 72 ATT RNEY Jan. 29, 1952 R. A. HAYES 2,533,735

SEWING MACHINE Filed July 29, 1950 a SheetsSheet 6 FIG. l3

INVENTOR. ROBERT A. HAYES ATTORNEY.

Patented Jan. 29, 1952 UNI TED S TATES PATENT OFICE.

2,583,735 SEWING Robert A. Hayes, Franklin Park, Ill. assignor to Union Special Machine Company. Ch cago, 111., acorporation of Illinois Application July29, 195,0, Serial No. 176,565

This invention :relates :to sewing machines andyin one of its morespecific aspects, to a sawing machine adapted to be advantageously .employed in the hemming of tubular articles such as leg bottoms of overalls and trousers, leg bot- :toms and sleeve ends of pajamas, and the like.

It is a primary object of the invention :to provide a lock stitch sewing machine that is adapted to readily hem tubular articles and that has improved structural and operational character- =istics.

Another object of the invention is to provide a sewing machine having a rotary hook with .a hollow generally cylindrical means that serves as a throat plate and as a guard for the rotary hook.

Another object of the invention is to provide (a sewing machine of the character indicated with -:a hollow, generally cylindrical throat platethat has a hook retainer disposed therein and that supports one of a pair of feed rollers which are adapted to advance a piece .of work :past the :needle of the machine.

The invention hasiorzanother object, the sproyisicn of a throat plate of a type indicated {that :isadapted to :be readily installed, ifelrlwedand adjusted :as :required.

Another object of the invention ,is to provide .an improvedsewing-machine work-feeding mechanism, including .a pair of feed rollers and associated .devices for imparting positive and in-' termittent rotation to the rollers, .the parts being so constructed and arranged that both rollers are actuated :at the same peripheral speed.

in further object of the invention is to provide a presser bar of asewing machine of the type indicated with a yoke that carries one or the rollersof the work-feeding mechanism and piv- .otally supports ,a presser .foot, means being provided tonormally .and ,yieldingly urge the presser .iootin a direction toward thethroat platemeans about its pivotal connection .with the yoke and additional means being provided for moving the presser foot in a reverse direction about -its pivotal connection with theyoke in response to predetermined npwardlmovement of the presser bar.

A still further object 01 the invention is topro- .vide asew'ing machine of the character indicated that is capable of performing its intended iunctionsin a itron'ble 'iree and fil ient mann r- Tothe ,endthat thefore o'ing jects may'b attained, .a .,sewing machine. constructed in, accordance with invention. preferably comprises .a frame including a ..base, a hollow stand- .ard, .a hollow. 3 overhanging arm projecting laterally. from :z-the upper en ref-1151 standa d nds hollow needle head secured to the freepncl .of the overhanging arm- The base is provided with a relatively narrow extension at its end r mote fr m t e s and r andsupports arotary h okthat proj t ey n the free end of the extension. A hollow, generally cylindrical throat plate means, secured to the extension, circumscribes and is spaced from the rotaryihook. 'Theithroat plate means may be of one piece construction or may consist .of sev- .eral pieces :as will :be described further along herein. Mounted within the throat plate means is a hook retainer. 'Ilfhe throat plate means is provided with integral external lugs that have bearings :ior supportinealower feed;;roll.er. The machine includes verticallygre ciprocable presscr and needle bars. Secured tothelower end of the presser bar for reciprocation therewith is a yoke that includes a pair of downward y and rear- .wardly extending arms. .An upp rzie d o l i rotatively supported between the yoke armsrabout :an .axis parallel to the axis of the lower feed roller. ;A .foot :presser me ber ;is pivotally connected to the end portions of the arms and extends over and Icrwa d yof the axis of th upp feed roller. Attached 3& the forward portion of themember is pr serioot having :a needle re- :speed through the medium of anarrangement of devices operable in timedrelation to reciprocation ofthe needle .bar and rotation of the rotary hook. This arrangement of devices includes .a

one-way clutch mechanism. a rotary driving shaft. ear means responsive to rotation of the driving shaft, and -a pair of driven shafts connected to the .gear means and to corresponding feed rollers. 'fIfhe drivenshafts are provided with universal joints, the driven shaft for the upper reed roller being adapted to compensate for movement of that roller occasioned :by work of varying thickness passing between the rollers.

The enumerated objects, together with other 'line 9'9 of Figure '3; Figure is a front 'presserfoot member; r

' Figure 9;

ing machine constructed in accordance with the I invention, certain parts being broken away and Y other parts being shown in central vertical longitudinal section for better illustration; v

Figure 2 is an enlargedbottomplan-view of the major portion of the sewing machine shown in Figure 1, certain parts beingbroken away and other parts being shown in longitudinal section;

Figure 3 is an end view of Figure l inenlargement as seen from the left thereof, certain parts,

;such' as cover plate and the needle, .being "omitted;

Figure 4 is a view in enlargement taken'along line44 of Figure 3;

1 Figure 5 is an enlarged view taken along line 5-5 of Figure 1, parts being omitted for better illustratio i L Figure 6 is an enlarged view in elevation of the hook retainer shown in Figure 2;

Figure 7 is a view taken along line .1-'-1 of.

Figured;

Figure dis a view taken along .staggered line '83 of Figure 5;

Figure 9 is a view in enlargement taken. along Figure 11 is a view taken along line l |-ll .of

' Figure 12 is an'enlarged isometric view of the hollow' throat plate and hook retainer shown in Figures 1' and 2; i 1 Figure 13 is a fragmentary viewlcorresponding to a portion of Figure 5- and illustrating afolder operably mounted on the machine;

Figure 14 is similar to Figure 11 and illustrates a modified form of construction;

Figure 15 corresponds to Figure 12 and illustrates a modified form ofthread plate means;

-Figure 16 corresponds to a portion of Figure 3 and illustrates another modification of the throat plate means construction.

f Referring "nowto the drawings wherein like reference numerals denote corresponding parts 'top surface 2|, a hollow vertical standard 22, rising from one end of the base, a hollow overhanging arm 23 extending laterally from the upper end of a vertical standard, and a hollow needle head 24 provided at the free end of the overhanging arm and having a removable cover plate 25. Base has an integral and relatively narrow extension'26 that is grooved as indicated at 21 in Figure 5.

, The machine is provided with a pair: of rotary 'inain shafts, namely," an u per main "Shaft 28 elevation view of the 4 within the overhanging arm (Figure l) and a lower main shaft 23 supported by the base beneath top surface 2| (Figures 1 and 2). These shafts are interconnected by a gear train 30 within the vertical standard. The upper main shaft is adapted to be driven from a suitable source through a combined handwheel and pulley '3 lsec'ured to its'outer'end'f K'needle bar 32, that carries aneedle 33 at its free end-is mounted for vertical reciprocation in the needle head and is arranged to be driven by a needle driving mechanism 34 in response to rotation of the upper main shaft. Mechanism 34 is preferably the same as the corresponding mechanism shown in said Sauer patent.

Cooperating with needle 33 in the formation of stitches in a piece of work is a rotary hook 35 that is afiixd to the outer end of an auxiliary rotary shaft 35 (Figure 2) which is supported by base 25 in parallel relationship to lower main shaft 29. Shaft 36 has a-gear tlwhic'h meshes with a gear 38 that-is secured to, and rotatable best shown in Figure-2, is positioned beyond the free end. of base extension 26. 4

Reference is next had to Figures 2, 5 andglz,

for an understanding of one recommended form of throat plate means 40, that is one of the features of the invention.- Means it-comprisesa hollow, cylindrical member 4|; having. ED111155}- gral extension 42 that is provided with a' pair of slots 43. Also integral with member 4! is a pair of spaced bearing lugs orsup-ports 44 that project rearwardly and upwardly therefrom.

Lugs 44 carry coaxialsleeve bearings 45. When the machine is assembled extension 42 registers with groove 21 in extensionz25 (Figure 5) :and

is secured thereto by screws ;46 which extend through slots 43. As is best shown in Figure 2 cylindrical member 4l surroundsand is spaced from rotary hook- 35 and is adjustable axially relative to the rotary hook asallowed by slots 43' and screws 46. Cylindrical member H has a front opening 41 to permit access to screw 48 of the rotary hook (Figure 2), and is provided with a vertically disposed needle bushing50 that is aligned with needle 33. i

In Figures 2, 6 and 7 there'is shown a hook retainer that consists of a", segmental member 5| and an integral inwardly projecting element or finger 52. The hook retainer is positioned wholly within cylindrical member 4| and is attached thereto by screw 53.

A lower feed roller is afiixed by a set screw 56 to a shaft 5'! that is rotatable inbearings 45 (Figure 5). The roller is toothed or serrated peripherally as indicated at 58 in Figure 3 for better traction and is ad apted'to cooperate with another roller to be described further along herein in feeding work past the needle. I V A presser bar 60 carried by ,and vertically reciprocable with respect to needle'head 24 isnormally urged downwardly. by a compression spring 6| (Figure 3). Aninverted generally U-shaped yoke 62 that includes a pair of spaced, parallel, downwardly an'drearwardly projecting arms 63 is aflixed to the lower'end'of. the 'presser bar by a set screw 64. A shaft 65, parallel to shaft 51, is rotatively supported in coaxial sleeve bearings 66 carried by arms 63. Attached to and rotatable absence with shaft 65 is an upperf'eed roller 61 that is toothed or serrated as indicated at 68. As is shown in Figure 3 roller 61 is directly "above roller 55 and is urged toward roller 55 due to the "action of spring 6| on the presser bar.

"Feed. rollers 55 and 61 are adapted 'to be rotated intermittently and in unison at the same peripheral speed by an arrangement of devices that will now be described, reference being had particularly to Figures 1, and 8. The arrangement of devices includes a one-Way clutch 10 that is preferably of the type disclosed in Schoij Patent No. 2,494,006, entitled Clutch Mechanism for Sewing Machines, granted January '10, 1950, to which re'ference'may be had "for details of construction. The one-way clutch is driven by almeans that isgenera'lly indicated by numer- "c1111 and that is similar to corresponding apparatus disclosed in Kucera Patent 'No. 2,265,605, entitled Sewing Machine, granted December '9, 1941. Parts of'means T! are shown in Figure 8 and include a lever 12 connected to the one-way clutch and having an elongated slot 13. A "ball pin 14 at the upper end of a pitman75 is adjustable along slot I3 to vary the stroke ofthe lever I2. The cpitman has a strap portion 16 which embraces an eccentric 7'! that is secured to lower mainshaft 2'9. It'will be apparent from a consideration or'Figure 8 that rotation of shaft 29 actuatesthepitman in a manner to impart oscill'atory movement to lever 12 thereby correspondin'gly actuatin one-wayclutch 10.

The one-way clutch includes a gear 80 '(Fig- "ure 1) 'whichmeshes with a second gear 81 that is ailixedby a set screw 82 to the inner end of a driving shaft 83 that is supported by clutch housing 84. A gear 85 is attached to the outer end of shaft "83 by a sets'crew 86. Gears 8| and 85 "are arranged so as "to permit of slight axial movement of shaft 83. A bracket 81 secured to the clutchhousing supports a rotary shaft 88 that is parallel to shaft 83 (Figure 5). Rotary movement is imparted to shaft 88 by a gear 89 that meshes withgear 85.

Shaft 83 is connected to upperroll'er shaft 65 by a sectional shaft 96 (Figure 1) that consists of end sections BI and '92 and an intermediate section 93 that forms universal joints with sections 91 and 92 as indicated at 94 and 95 respectively. Similarly shaft 88 is connected to lower feed roller shaft 51 by a sectional'shaft 96 (Figure '5), that consists of end sections '91 and 98 and an intermediate section 99 that forms uni versaljoints withsections 91 and 98 as indicated at I00 and HM.

Apin N13 is supported by the free end portions of yoke arms 63 and is secured to one of thesearmsby a set screw I64 (Figures 3 and 9).

Apresser arm member I65, best shown inFigures "3,9 and 10, comprises a web I66 and a pair of upstanding arms I51 "and 'l68'that are apertured to receive and form a pivotal connection with pin I03. Arm [6! projects above arm I08. On the "other hand, arm I 08 "has an integral extension Hi9 that extends upwardly and forwardly over roller shaft 65 and thence downwardly and forwardly as illustrated in Figure 3. Ahorizontally "bears against the rear edge of arm 101, and 'is movement of presser bar 60.

positions shown in Figures 1 .and 3.

threaded at its forward end to'receive aknurle'd adjusting nut II4. A compression spring I I5 is coaxial with the bar, and bears at its opposite ends against the yoke and nut II4, to normally and yieldingly urge bar III] toward the right, thereby urging presser foot member I05 inn clockwise direction about pin I63 as viewed "in Figure-3.

A presser foot I I6 is attached 'to the forward "end of arm I09 by a stud Ill. The presser foot has a slot I8 that aligns with throat plate bushing 50 and that receives needle 33 during operation. The free end of arm I09 may bear against the upper face of the presser foot as shown in Figure 11 thereby preventingpivotal "that comprises a link I2! pivotally connected at 1 its lower end to stud II! and at its upper end "to a stud I22, that is attached to the lower end ofa vertically reciprocable rod I23. A collar I24 is attached to the upper end of rod I23 by a set screw I25 and carries a generally L-shaped rod I26 that is adjustable laterally with respect to the collar by a set screw (not shown). Mechanism I 29 is similar in construction, function and operation to the one disclosed in Christensen Patent No. 2,434,608 entitled SewingMachine,

r granted January 13,1948, to which-referencemay be'had.

Referring next 'to Figures 3 and i, I have illustrated therein -a means for swinging presser footmember I35 and therefore presser 'foot H6 in a counter clockwise direction as viewed in Figure 3, about pin I03, against the action of spring 'I 15 in response to predetermined upward In this connection a presser barlever I39 having a camming edge I31 is pivoted to needle head24 by a stud I32. Camming edge I3! cooperates with abracket I33 that is attached to the presser bar to move the presser bar upwardly against the action of spring '61 in response to clockwise movement to lever I36 as viewed in Figure 3. Another bracket I34 'is afiixedto the needlehead by a screw I35 which extendsthrough an elongated slot I36 that permits of horizontal adjustment of the bracket relative to the needle'head. A cam member I31 having a cammin'g surface I38 is attached to the rearo'f bracket I34 by a screw I39. As will be observed from an inspection of Figure 3, the upper extremity of arm I 01 is adapted to ride along camming surface I38 upon predetermined upward movement of the presser bar, thereby swinging presser bar I65 in a counter clockwise direction against the action of spring II5. This effects raising of presser foot HE.

:A bracket M3 is attached to base extension 26 by screws Ml. A collapsible folder I42 (Figure 13) may be mounted on bracket I46 by "screws M3; Folder I42may be the same as or similar to the one disclosed in Chalman Patent No. 1,305253, entitled Hemmer for Sewing Machines, granted June 3, 1919.

For the purpose of briefly outlining the mode of operation of the embodiment of the invention shown'in Figures 1 through 13,'it is assumed'that the parts are assembled and are in the relative Combined rangement shown in the drawing, springs BI and H permit the rollers and the "scribed throat plate means 40. prises upper. and lower semi-cylindrical memfhandwheel and pulley 3| is rotated by a-suitable driving means that preferably consists of an of rotary hook 35. Simultaneous therewith onepositioned in surrounding and spaced relation way clutch I0 is actuated by its driving means "II, thereby imparting intermittent rotationv to driving shaft 83 which, by virtue of its interconnection with gears 85 and 89 and shaft 88, imparts corresponding rotation to sectional shafts 99 and 56, and thence to upper feed roller 6'! and lower feed roller 55, respectively. Upper feed roller 61 is rotated in a clockwise direction while lower feed roller 55 is rotated in counterclockwise direction, as viewed in Figure 3, in the course of operation. Compression spring 6| urges presser bar 60 downward so that a piece of tubular work to be hemmed by the machine is I gripped and fed past the needle by the rollers.

.At the same time presser foot I I6 is urged downwardly due to the action of spring II5. I The arincluding presser foot to accommodate themselves to varia- I tions, due to seams and the like, in the thickness of the work being stitched. The slight axial movement permitted in shaft 83 compensates for vertical movement of the presser bar and upper feed roller.

Figure illustrates a modified form of throat plate means M5 corresponding to earlier de- Means I combers I46 and I4! having corresponding hinge lugs I48 andI49 that are joined by a hinge pin I50. The semi-cylindrical members are maintained in the illustrated position by a spring detent that includes a leaf spring I5I afiixed to lower member It! by a screw l52 and having a kink I53 that registers with a groove I54 in number I46. This construction permits of ready access to the .rotary hook for purposes of adjustment or repair without the necessity of removing the entire throat plate means from the base.

Another modification of the throat plate means is generally designated bynumeral I55 in Figure 16, and comprises an arcuate upper member I55 having a pair of lugs I51, only one of which is shown. These lugs correspond to lugs 44 of the embodiment shown in Figure 12.

Means I55 also comprises an arcuate lower member preferably made of sheet metal and having a lateral flange I59 that is secured to the underside of lugs I5! by screws I60. The throat plate means of Figure 16 is also provided with a hook retainer IBI that corresponds to hook retainer 5| of Figure 12.

-' Thus it will be seen that the constructions herein shown and described are well adapted to accomplish the objects of the present invention. It will be understood, however, that the invention may be embodied otherwise than as here shown, and that in the forms illustrated, certain obvious changes in construction may be made.

operate with a needle secured to the needle bar.

to the rotary hook, a retainer for the rotary'hook attached to and disposed within the throat plate, a pair of substantially parallel feed rollers consisting of a first roller mounted on the throat plate and a second roller secured to the presser bar, a rotary roller driving shaft carried by the frame, means for imparting intermittent rotation to the driving shaft, first and second rotary shafts connected respectively to the first and second rollers, and means for simultaneously rotating the first and second shafts at the same peripheral speed in response to corresponding rotation of the driving shaft. n

2. In a sewing machine that includes a fraxr e which carries vertically reciprocable presser and needle bars and a rotary hook ,adaptedtofcooperate with a needle secured to the needle bar in the formation of stitches in a piece .of work, a one-piece hollow and generally cylindrical throat plate secured to the frame and positioned in surrounding and spaced relation to the rotary hook, support means integral with and'exterior the throat plate, a retainer for the rotary hook attached to and disposed within the throat plate, a pair of substantially parallel feed rollersfconsisting of a first roller mounted on the support means and a second roller secured to the presser bar, and means for; imparting intermittent and simultaneous rotation to the rollers.

, 3. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a needle secured to the needle, bar in the formation of stitches in a piece of work, a one-piece hollow and generally cylindrical throat plate secured to the frame and positioned in surrounding and spaced relation to the'rotary hook, support means integral with and exterior the throat plate, a retainer for the rotary hook attached to and disposed within the throat plate, a pair of substantially parallel feed rollers consisting of a first roller mounted on the support means and a second roller secured to thepresser bar, a rotary rollerdriving shaft carried by the frame, means for imparting intermittent rota- ..tion to the driving shaft, first and second rotary 'shafts connected respectively to the first and second rollers, and means for simultaneously rotating the first and second'shafts at the. same peripheral speed in response to corresponding rotation of the driving shaft. a 1

p 4. In a sewing machine that includes aframe which carries vertically reciprocable presser and needle bars and a rotary hook adapted to coopcrate with a needle secured to the needle bar in the formation of stitches in a piece of work, hollow throat plate means secured to the frame and positioned in surrounding and spaced relation to the rotary hook, said means comprising arcuate upper and lower members, the upper member being attached to the frame and the lower member depending from the upper member, a retainer for the rotary hook attached to the upper, member and positioned withinthe throat plate means, a pair of substantially parallel feed rollers mounted respectively on the upper member and the presser bar, and means for imparting intermittent and simultaneous r0- tation to the rollers. I

5. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a needle secured to the needle bar in the formation of stitches in a piece of work, hollow throat plate means secured to the frame and positioned in surrounding and spaced relation to the rotary hook, said means comprising arcuate upper and lower members, the upper member being attached to the frame and the lower mem- ;ber depending from the upper member, support means integral with and exterior the upper memher, a retainer for the rotary hook attached to the upper member and positioned within the throat plate means, a pair of substantially parallel feed rollers consisting of a first roller carried by the support means and a second roller carried by the presser bar, and means for imparting intermittent and simultaneous rotation to the rollers.

6. A sewing machine in accordance with claim including a hinge connecting the upper and lower members and detent means releasably maintaining the lower member in predetermined angular position with respect to the upper memher.

upper member, detent means releasably maintaining the lower member in predetermined an gular position with respect to the upper member, support means integral with and exterior the upper member, a retainer for the rotary hook attached to the upper member and positioned within the throat plate means, a pair of sub stantially parallel feed rollers consisting of a first roller mounted on the support means and a second roller secured to the presser bar, a rotary roller driving shaft carried by the frame, means for imparting intermittent rotation to the driving shaft, first and second rotary shafts connected respectively to the first and second rollers, and means for simultaneously rotating the first and second shafts at the same peripheral speed in response to corresponding rotation of the driving shaft.

8. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a. needle secured to the needle bar in the formation of stitches in a piece of work, a hollow throat plate secured to the frame and positioned in surrounding and spaced relation to the rotary hook, a yoke attached to and reciprocable with the presser bar, a pair of substantially parallel feed rollers consisting of a first roller mounted on the throat plate and a second roller carried by the yoke, means for imparting intermittent s multaneous rotation to the rollers, a presser foot member pivotal with respect to the yoke about an axis that is rearward of the of the second roller, a presser foot attached to the presser foot member and positioned forward of the second roller, and resilient means normally and yieldingly urging the presser foot member in a direction toward the throat plate about its pivotal connection with the yoke.

9. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a needle secured to the needle bar in the formation of stitches in a piece of work, a hollow throat plate secured to the frame and positioned in surrounding and spaced relation to the rotary hook, a yoke attached to and reciprocable with the presser bar, a pair of substantially parallel feed rollers consisting of a first roller mounted on the throat plate and a second roller carried by the yoke, a rotary roller driving shaft carried by the frame, means for imparting intermittent rotation to the driving shaft, first and second rotary shafts connected respectively to the first and second rollers, means for simultaneously rotating the first and second shafts at the same peripheral speed in response to corresponding rotation of the driving shaft, a presser foot member pivotal with respect to the yoke about an axis that is rearward of the axis of the second roller, a presser foot attached to the presser foot member and positioned forward of the second roller, and resilient means normally and yieldingly urging the presser foot member in a direction toward the throat plate about its pivotal connection with the yoke.

10. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a needle secured to the needle bar in the formation of stitches in a piece of Work, a hollow throat plate secured to the frame and positioned in surrounding and spaced relation to the rotary hook, a yoke attached to and reciprocable with the presser bar, a pair of substantially parallel feed rollers consisting of a first roller mounted on the throat plate and a second roller carried by the yoke, means for imparting intermittent and simultaneous rotation to the rollers, a presser foot member pivotal with respect to the yoke about an axis that is rearward of the axis of the second roller, a portion of the presser foot member extending over and forwardly of the axis of the second roller, a presser foot attached to the presser foot member forward of the axis of the second roller, and resilient means normally and yieldingly urging the presser foot member in a direction toward the throat plate about its pivotal connection with the yoke.

11. A sewing machine in accordance with claim 8 including means responsive to predetermined upward movement of the presser bar for moving the presser member in a reverse direction about its pivotal connection with the yoke against the action of the resilient means.

12. A sewing inachine in accordance with claim 11 wherein the means recited therein comprises a stationary camming element secured to the frame.

13. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a needle secured to the needle bar in the formation of stitches in a piece of work, a hollow throat plate secured to the frame and positioned in surrounding and spaced relation to the rotary hook, an inverted generally U-shaped yoke attached to and reciprocable with the presser bar, said yoke including a pair of spaced downwardly and rearwardly projecting arms, a pair of substantially parallel feed rollers consisting of a first roller mounted on the throat plate and a second roller carried by the yoke arms, means for imparting intermittent and simultaneous rotation to the rollers, a presser foot member carried by and pivotal with respect to the yoke arms about an axis that is rearward of the axis or the second roller, a portion of the presser foot member extending over and forwardly of the axis of the second roller, a presser foot attached to the presser foot member forward of the axis of the second roller, and resilient means normally andyieldingly urging the presser foot member in a direction toward the throat plate about its pivotal connection with the yoke.

14. In a sewing machine that includes a frame which carries vertically reciprocable presser and needle bars and a rotary hook adapted to cooperate with a needle secured to the needle bar in the formation of stitches in a piece of work, a hollow throat plate secured to the frame and positioned in surrounding and spaced relation to the rotary hooldan inverted generally U-shaped yoke attached to and reciprocable with the presser bar, said yoke including a pair of spaced downwardly and rearwardly projecting arms, a

pair of substantially parallel feed rollers consisting of a first roller mounted on the throat plate and a second roller carried by the yoke arms, a rotary roller driving shaft carried by the frame,

12 means for imparting intermittent rotation tothe driving shaft, first and second rotary shattsiconnected respectively to the first and second rollers, means for simultaneously rotating the first and second shafts at the same peripheral speed in response to corresponding rotation of the driving shaft, and means responsive to predetermined upward movement of the presser bar for moving the presser foot member in a reverse direction about its pivotalconnection with the yoke arms against the action of the resilient means, said last mentioned means comprising a oamming element secured to the frame.

ROBERT A. HAYES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Pyluck Jan. 31, 1939

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