US1521701A - Presser foot - Google Patents

Description

Jan, 6, 1925.

J. R. MoFFATT PRESSER FOOT Filed sept. 1, y19:21

3 Sheets-Sheet 1 MH 7 i #11110 J. R. MOFFATT PREssER FooT Jan. 6. 1925. 1,521,701

Jan. 6. 1925. 1,521,701

J. R. MOFFATT PRESSER FooT Filed Sept. 1, 1921 3 Sheets-Sheet 3 mm 1mm M lum i Patented Jan. 6, 1925.

UNITED STATES PATENT OFFICE.

JAMES R. IMOFFATT, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS- PRESSER FOO'T.

Application filed September 1, 1921. Serial N20. (197,563.

To aZZwwm t may concern:

' Be it known that I, JAMES R. MOFFATT, a citizen of the United States, residing at Chicago, in the county of Cook', State of Illinois7 have invented certain new and useful Improvements in Presser Feet, of which the following is a description, reference being hady to the accompanying drawing, and to the figures of reference marked thereon.

The invention relates to new and useful improvements in presser feet for sewing machines, and more particularly to a presser foot which is adapted to be used in connection with the forming of a flatcovered seam.. An object of the invention is to provide a pressez` foot of the above type having a slot for guiding and overlapping the edge portions of the fabric sections, which presser foot is provided with a section in rear of the needles which is rigidly supported by the shankyof the presser foot, and wherein the presser foot sections at each side of and imp mediately in front of the needles are yieldingly supported by said shank.-

A further object of the invention is to provide apresser foot of the above type whereinthe tension of the spring on one or more of"the yielding sections may be adjusted to vary the pressure of said section against the fabric.

A still further bj'ectof the invention is to provide a presser foot of the above type wliein the slot for guiding and overlapping 'the edge portions of the fabric sections tions of the presser-foot so that said sections may shift relative to each other to permitthe free passage of cross seams.

A still further object of the invention is to provide a presser foot of the above. type wherein the rigidly supported section in rear of the needles is extended to one side of and above one of the yielding sections 'so as to support the stationary member of a trimmin mechanism. v

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

is formed by the yieldingly supported sec'M that the work support is shown in' broken lines only;

. Fig. 3 is a vertical sectional view on the line 3 3 of Fig. 2;

f lig. 4 is a bottom plan view of the presser oo v Fig. 5' is a, sectional view on the line 5--5 of Fig. 3;' and with the yielding portions of the presser foot at theirlower limit of movement; e"

Fig. 6 is a similar, view but showin the yielding sections at their upper limit of movement; Fig. 7 is a front view of the presser foot; Fig. 8 is a` sectional view of the presser foot on the line 8 8 of Fig. 2;

Fig. 9 isa longitudinal sectional view longitudinally through the presser foot;

Fig. 10 is a perspective view of the portion of the presser foot which is rigidly secured to the supporting shank;

Fig. 11 is a perspective View of one of the yielding sections, and

Fig. l2 is a plan view of the throat plate :(ind the fabric engaging portions of the feed 'Fly improved resser foot as above noted, is particularly ad ing a fiat covered seam, that is, for joining two fabric sections while the edges thereof are Hat and unfolded by cross connected lines of stitching, which not only join the fabric sections, but cover the raw edges thereof. The fabric sections are preferably slightly overlapped and are joined lby a three-needle stitch covering mechanism, wherein the center needle passes through the overlapped fabric sections while` the outer needles pass outside of the respective' edges ofv the fabric sections so that the looper apted for amachine mak-v thread on one face of the fabric sections and the cross thread on the other face of the fab-ric sections joining the needle thread loops will cover the edges of the fabric sections.

The presser foot is provided with a slot leading into the front end thereof which is in line with the hole through which the needles pass and communicates therewith.` This slot guides the upturned edges of` the fabric Sections so that they may be trimmed, and the trimmed edges through the shaping of the walls of the slot are caused to overlap one upon the other and are thus directed to the stitching mechanism.

The presser foot consists of a main section rigidly carried by a supporting shank. This main section in the line of the needles is disposed substantially in rear of the needles. Said main section extends to one -side and then forwardly from this portion in rear of the needles and is provided with a groove or reces in whichis located the yielding section of the foot. This yielding section extends alongside of and in front of the needles. On the other side of the section in rear of the needles there is a yielding section which extends alongside of and in front of the needles. The two yield- Aing sections have their adjacent edges spaced and shaped so as to receive the upturned edges of fabric sections, direct the same to a trimming mechanism, and then turn said trimmed edges down into overlapped relation. The spring which causes one of the yielding sections to move downwardly'against the fabric is so constructed and arranged that the tension of the spring maybe readily varied and thus the pressure of the yielding section on the fabric varied.

'The stationary member of the trimming mechanism is mounted on the main section of the presser foot and on that portion thereof which' projects forwardly and is re` cessedfor the yielding'member referred to above.

Referring more in detailtothe drawings, I have shown my improved presser foot as applied to a feed-off-the-arm type of machine. Said machine includes a work supportingarm 1 which is provided with a throat plate 2 at` its forward end. Feed dogs 3 and 4 are provided with fabric engaging sections working in suitable slots in the throat plate as indicated in Fig. 12 of the drawings. The throat plate is provided with a needle hole 5 and stitch lingers 6. The needles are indicated at 7, 8 and 9 in Fig. 2 of the drawings, and are three in number. These needles are carried by a suitable needle bar 10. The material is fed olf from the end of the arm by these feed dogs 3 and 4. Cooperating with the needles 7, 8 and 9 beneath the work support is a looper `11 carried by the looper shaft 12.

. the under by means of the screw 31.

33m the side of the shank 28.

This looper lays a looper thread into all of the needle loops which connects the needle loops and also covers the edge of fabric sections. The needle threads are joined on the upper face of the fabric by a-cross thread laid by a suitable cross thread laying mechanism not shown in the drawings.

Cooperating with the feed dogs is a presser foot which includes a main section 13, a yielding section 14, and a yielding section 15. The main section 13 is rigidly carried by the supporting shank 1G which in turn is attached to the presser supporting bars 17. This main section 13 comprises a foot section 18 which is cut away at 19. This foot section 18 is directly in rear of the needles and is substantially wholly in `rear of the needles. Said section is substantially the same width as the covered seam. Said seam after it is completed, passes into the cut away portion 19 and then underneath the foot section 18. The main section 13 of the foot is also provided with a fabric engaging section 20 which extends forwardly and serves as a support for the stationary member of the trimming mechanism.` Said stan tionary member is indicated in dotted lines at 21 in Fig. 2. Cooperating with this stationary member of the trimming mechanism is a movable member 22 carried by an arm 23. The foot section 20 is recessed at 24 to receive the stationary member of the trimming mechanism, and said member is held in place by a clamping plate 25 secured to the foot section 20 by screws 2G, 26.

The main section 13 is provided with a recess or groove 27 which extends the full length of the presser foot and located in said groove or recess 27 is the yielding section 14. Said yielding fabric engaging section 14 is yprovided with an upwardly extending shank 28 which slides in a. recess provided therefor in the main section 13 of the foot. A spring 29 is located in a recess 30 in said shank 28 and bears against the lower end of said recess. The upper en d of this spring 29 bears against a collar which can be shifted up-and down By turning this screw 31, the tension of the spring 29 may be varied. A stop screw 32 is threaded into the main section of the foot 13 and the inner end of said stop screw extends into a slot This slot is o'f suicient length to allow fabric engaging section 14 to move vertically, but theupper end of the slot engages a screw and limits the downward movement of said yielding section when the entire foot is lifted off from the fabric.

Said yielding section 14 is provided with an opening 34 in which is located a second auxiliary section 35 carried by an arm 36 relation to each other.

pivoted at 37 to the fabric engaging section 20 of the presser foot and yieldingly pressed downwardly by means of a spring 38.

Said yielding section 14 also carries an arm 39 which is -rf provided with spaced stitch fingers or upper thread vguides 40. These extend between the needles and a cross thread is laid over these fingers and is fed offI from the same by the feed of the machine. These fingers together with the stitch fingers on the throat plate aid in the chaining off between articles,l and also in the formation of the covering stitches.

e On the opposite side of the foot section 18 from the yielding section 14 is located the yielding section 15. Said yielding section 15 is provided with a shank 41 wluch slides between the guiding Walls 42, 43 `carried by the main section of the presser foot. The cover plate 44 holds the shank in place, and a. spring 45 yieldinglyforces said section 15 downwardly. A stop screw 48 passing through the opening in the shank limits the downward movement of the yielding section r15 when the presser foot is raised.' The inner face of the fabric engaging section 14 is beveled at 47 and curved at 46 so as to cooperate With the curved surface 49 on theI yielding section 15. These curved and.v

beveled surfaces are so shaped as to receive the upturned edges of the fabric sections and direct the same to the trimming mechanism and after they are trimmed, turn down said trimmed edges into overlapped It will be noted that the two sections are yieldingly mounted so that they are capable of independent upward movement. This is of great advantage in'guiding the edges of the fabric sections and controlling the same, and at the same time to permit cross seams in the fabric sections to readily pass through the foot.

y my improved construction of presser foot, the fabric is firmly held in engagement with the fabric engagin sections of the feed dog, both in rear o the needles and at the side of the needles. The foot is raised by the thickness of the seam, and when so raised, the yielding sections move downwardly as indicated in Fig. 5, so as tov firmly hold the fabric sections of` single thickness at each side of the needle in cooperative relation to the feed dogs. It will' be noted that the fabric sections until they reach the needles, are independently fed by the feed dogs. The means for adjusting the tension on o-ne of the yielding sections enables the pressure on the fabric sections to be independently varied and thus the two fabric sections caused to be fed evenly. The main section of the presser foot which is rigidly carried by the supporting shank, engages the` fabric sections after Ithey are stitched7 andthel seam 1s formed, and therefore, the greatest pressure of the presser foot against the feed dogs, is brought to bear directly upon the finished seam. This also tends to a very uniform feeding of the fabric sections being stitched.

lIt is obvious that minor changes in the details of construction may be made without departing from the spirit of the inventio-n as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is

1. The combination with a stitch forming mechanism, for forming covering stitches including a plurality of needles; of a feed dog and a presser foot, said presser foot including a supporting shank, a main sec-- tion rigidly carried thereby and engaging the fabric sections in rear of the needles, and yielding fabric engaging sections located respectively at the sides of and in front of said needles, said yielding sections having inclined spaced overlapping parts in front 4of the needles arranged so as to guide and overlap the edge portions of the fabric sections.

2. The combination with a stitch forming mechanism for forming covering stitches including a plurality of needles; of a feed dogv and a presser foot, said presser foot including a supporting shank, a main section rigidly carried thereby and engaging the fabric sections in rear of the needles, and

yielding fabric engaging sections located respectively at the sides of and in front of said needles, said yielding vsections being spaced and shaped in front of the needles so as to guide and overlap the edge portion:` of fabric sections, and means for varying the pressure of one of said yielding sections, relative to the other.

3. The combination with a stitch forming 1 mechanismfor forming covering stitches including a. plurality of needles; of arfeed dog and a presser foot,said presser foot 1ncluding a supporting shank, a main section ri idly carried vthereby and. engaging the fa ric sections in rear of the needles, yield- .ing fabric engaging sections located respectively at the sides of and in front of said needles, said yielding sections being spaced and shaped in front of the needles so as to guide and overlap the edge portions of fabric sections, and stitchvfingers carried by one of said yielding sectionsl and extending between the needles.v I

4. The combination with a stitch forming mechanism for forming covering lstitches including a plurality of needles; a feed dog and a presser foot, said presser foot including a-supporting shank,.a main section rigidly carried thereby and located substantially in rear of the needles, said main secftion having a portion extending laterally and forwardlyl alongside of the needles, said maln sectlon having a recess extendlng longitudinally thereof, and a yielding fabric engaging section located in said recess and extending alongside of and in front of the needles, a second yielding fabric engaging section located on the other side of the section in rear of the needles and extending alongside of and in front of the needles,.said yielding sections being spaced from each other and shaped so as to guide and overlap the edge portions of fabric sections.

5. The combination with a stitch forming mechanism for forming covering stitches including a plurality of needles; a feed dog and a presser foot, said presser foot including a supporting shank, a main section rigidly carried thereby and located substantially in rear of the needles, said main section having. a portion extending laterally and forwardly alongside of the needles, said main section having a recess extending longitudinally thereof, a yielding fabric engaging section located in said recess and extending alongside of and in front of the needles, a second yielding fabric engaging section located on the other side of the sectionin rear of the needles and extending alongside of and in front of the needles, said yielding sections being spaced from each other and shaped so as to guide and overlap the-edge portions of fabric sections, a spring for yieldingly forcing the section located in said recess downwardly', and means for varying the tension of said spring. 6. The combination with a stitch forming mechanism for forming covering stitches including a plurality of needles, a feed dog and a'presser foot, said presser foot including a supporting shank, a main section rigidly carried thereby and located substantially in rear'of the needles, said main section having a portion extending laterally and forwardly alongside of the needles, said main section having a recess extending longitudinally thereof, a yielding fabric en-v gaging section located in said recess and extending alongside of and in front of the needles, a second yielding fabric en aging section located on the other side of t e section `in rear of the needles and extending alongside of and in front of the needles, said yielding sections being spaced from each other and shaped so as to guide and overlap the edge portions of fabric sections, a spring for yieldingly forcing the section l0- cated in said recess downwardly, means for varyin the tension of said spring, and stitch ngers carried by one of said yielding sections, said portion of the main foot section in rear of the needles being cut away to receive said stitch fingers.

7. The combination with a stitch forming mechanism' for forming covering stitches including a plurality of needles; a feed dog and a presser foot, said presser foot including a supporting shank, a main section rigidly carried thereby and located substantially in rear of the needles, said main section having a portion extending laterally and forwardly alongside of the needles, said main section having a recess extending longitudinally thereof, a yielding fabric engagingsection located in said recess and extending alongside of and in front of the needles, a second yielding fabric engaging sectionlocated on the other Side of the section in rear of the needles and extending alongside of and in front of the needles, said yielding sections being spaced from each other and shaped so as to guide and overlap the edge portions of fabric sections, said forwardly projecting portion of the main foot section being adapted to support the fixed member of the trimming mechanism.

8. The combination with a stitch forming mechanism for formin covering stitches including a plurality o needles, a feed dog and a presser foot, said presser foot including a supporting shank, a Amain section rigidly carried thereby and located substantially inrear of the needles, said main section having a portion extending laterally and forwardly alongside of the needles, said main section having a recess extending longitudinally thereof, and a yielding fabric engaging section located in said recess and extending alongside of and in front of the needles, a second yielding fabric engaging section located on the other side of the section in rear of the needles and extending alongside of and in front of the needles, said yielding sections being spaced from each other and shaped so as to guide and overlap the edge portions of fabric sections, said yielding fabric engaging section located in said recess having an opening formed therethrough, and a second auxiliary yielding fabric engaging section extending through said opening and carried by the rigid foot section.

In testimony whereof, I afiix my signature.

JAMES R. MOFFATT.

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