US2086013A

US2086013A - Sewing machine

Info

Publication number: US2086013A
Application number: US8240A
Authority: US
Inventors: Grover C Cooper
Original assignee: Union Special Machine Co
Current assignee: Union Special Machine Co
Priority date: 1935-02-26
Filing date: 1935-02-26
Publication date: 1937-07-06
Anticipated expiration: 1954-07-06

Description

July 6 1937. G. c cooPER 2,086,013

SEWING MACHAINE Filed Feb. 26, -1935 3 Sheets-Sheet 1- EIGL- 1;

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29 55 2l w ze WITNBSES.- INVENTOR- @T2 l @Tomar C. 00011753'- Patented July 6, 1937 stre-s Aren-@r Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application February 26, 1935, Serial No. 8,240

10 Claims.

This invention relates to sewing machines; and it has more particular reference to sewing machines with ruifling mechanism whereby tucks are formed in one strip of fabric concurrently with sewing thereof to another fabric strip.

In conventional forms of ruffling sewing machines, the presser feet are made solid, i. e., in one piece, and provided on their bottom faces at the front with clearances which extend to a point well beyond the needle or needles of the machine in the direction of fabric feed, to receive the advance edge of the ruifling blades. With this construction, it is impossible to form small or skimpy tucks in the ruffle fabric.

The chief aim of my invention is to overcome the above mentioned drawback. This objective I attain in practice, as hereinafter more fully set forth, through provision of a presser foot having a heel component pivotally connected with capacity for up and down movement, to the presser bar of the sewing machine and subject to comparatively heavy spring pressure; and a toe component pivoted to the heel component and subject to relatively light spring pressure with capacity to move independently up and down while cooperating with the ruling blade of the sewing machine in forming the fabric tucks.

Other objects and attendant advantages will be manifest from the detailed description following of the attached drawings, wherein Fig. I is a fragmentary front elevation of a ruiiling sewing machine conveniently embodying my invention, a portion of the head of the machine being broken out to expose important parts at the interior.

Fig. II is a fragmentary detail View drawn t0 a larger scale and showing a cross section of the machine along the line of fabric feed.

Fig. III is a fragmentary plan sectional View taken as indicated by the arrows III-III in Fi-g. II.

Figs. IV and V are detail sectional views taken as indicated respectively by the arrows IV--IV and V-V in Fig. III.

Fig. VI is a detail sectional View taken as indicated by the arrows VI-VI in Fig. IV; andv Figs. VII and VIII are views like Fig. II with the parts in different operative positions.

With more specific reference to these illustrations, I designates the throat plate of the sewing machine which is supported by the base or work table 2. Rising from .the base 2 is the usual gooseneck 3, which terminates in a head d. Vertically reciprocative in the head l is a needle bar 5, which in the Vpresent instance, carries two needles 6 at its lower end, said needles being aligned fore and aft of the machine. Operating in a transverse slot i of the throat plate I is a feed dog 8 to-which the necessary movements are y imparted by mechanism (not shown) within the hollow of the base 2 to intermittently advance the work in the direction of the arrows in Fig. VII. The rufing mechanism of the machine includes a longitudinally-extending rock shaft I with journal support in bearingsl Il secured by screws I2 to the side of the gooseneck 3. By suitable means within the hollow of the machine frame, the shaft I0 is rocked to impart vibratory motion to a pendant arm i3 at the forward end thereof, whereto is pivotally connected at the bottom end at I i a holder I5 with an attached ruiiiing blade I6. This ruiiling blade .It is yieldingly urged downward. by a helical spring Il connected at one end to an adjustable lug I8 on the pendant arm I3 and at the other end to the holder I5. The machine is furthermore provided with an upper fabric folder I9 which is supported by a fixed bracket arm. 2t secured to the head d; and a lower fabric folder 2| which is secured to the base 2 of the machine, said folders I9 and 2l being respectively convergent toward the needles 6. Also secured to therbracket 2t is a divider plate 22 which serves to maintain the upperand r lower fabric stripsfF and F '(Figs. VII and VIII) directed through thefolders I9 and 2I separated until they reach the needles 6. The parts thus far described are of conventional design and con'- struction and are pertinent to my invention only insofar as they cooperate with the novel presser foot which is about to be described.

Slidably guided in the head d is a vertical presser bar 23 which is subject to a relatively heavy leaf spring 2t within the hollow of said head. At its lower end the presser bar 23 is fitted with a shank member 25 carrying the presser foot 2B, which comprises a heel component 21 and a toe component 28. As shown, the heel component 2l has a flat horizontal bottom portion 29, and a pair of transversely spaced upstanding horizontal iianges 39 which lap the sides of the shank member 25, and which, at their forward ends,r are pivotally connected to said shankmember by a fulcrum pin 3I. An adjusting screw 32 threadedly engaged in an inclined tapped hole in the shank member 25, serves to limit the amount of free -pivotal movement allowed the heel component 21 of the presser foot about the fulcrum pin 3l, said screw being xable inv adjusted posi- I tions by means of a jamb nut 33. The toe cornponent 28 of the presser foot 2S has aflat bottom latter.

portion 35 which normally constitutes a continuation of the flat bottom portion 29 of the heel component, and a forwardly and upwardly inclined frontal portion 36. The toe component 28 is furthermore provided with laterally-spaced horizontal arms 31, which are pivotally connected by means of screws 38 to the flanges 30 of the heel component 21 at the rear end of the By virtue of this construction, the toe component 28 is given the capacity for pivotal movement independently of the heel component 21, the upward movement of said toe component being yieldingly resisted by a relatively light spring 39 which has a central loop 40 for passage of a securing screw 4l engaged in the shank member 25 of the presser bar 23, and lateral coils 42 which terminate in arms 43 that bear downwardly on said toe component. edge of the portion 35 of the toe component 28 abuts against the front edge of the portion-29 of the heel component 21 with the bottom faces of the two flush. As shown in Fig. III, the heel and

toe components

21 and 28 of the presser foot are formed'along their abutting edges with longitudinally aligned

notches

44 and 45 which jointly constitute apertures for passage of the sewing needles 6.

The upper face of the inclined forward send of the toe component 28 of the presser footis formed with a transverse slot 46, see Figs. III and IV, to receive the tongue 41 ofY a fabric edge guide 48. The tongue 41 of the guide 48 is longitudinally slotted for passage of a clamp screw 49 which serves as a means to secure the guide in different positions of lateral adjustment on the presser foot component 28.

The operation of the machine is as follows: The fabric F is directed through the lower folder 2| of the machine, and incident to passage therethrough has a marginal fold M' (Fig. III) formed therein. The fabric F is concurrently directed through the upper folder I9 and by the latter formed with a marginal fold M corresponding to the marginal fold M' of the lower fabric F', the two fabrics being for a time maintained in separation in the usual manner by the dividing plate 22. rIhe fabric F in Figs. VII and VIII passes Y perfectly fiat beneath the presser foot 26 throughout the operation, While each time that the rufiling blade I6 moves forward, it catches the upper fabric F at a point somewhat outward of the toe portion 28 of the presser foot and by cooperation withA the latter as in Fig. VII, forms a tuck T which it places beneath the portion 35 of said toe component, the latter yielding to upward movement under the action of the spring 39 with attendant smoothing of said fold. During a slight dwell of the ruiiling blade I6 in its advanced position, the needles 6 descend and penetrate the newly formed fold T of the upper fabric F as well as the lower fabric F with attendant joining of the two strips by the stitches formed with the needle threads as conventionally shown in Figs. VII and VIII. After penetration of a new fabric fold by the needles 6 the ruifling vblade I6 recedes, thereby permitting the

toe component

2,8 of the presser foot to descend under the action of its spring 35 to hold down the newly formed tuck while the work is advanced by subsequent action of the feed dog 8. Incident to this operation, the guide 48 on the toe component of the presser foot 25 operates to guide the folded edge of the upper fabric F as it is passedto the needles 6.

Normally, the rear 1.`In a sewing machine, a fabric support; a

needle; means for intermittently feeding fabric on the support past the needle; a reciprocating ruilling blade; and a presser foot with a pivotallysupported main component and an independently yielding supplemental component pivotally connected to said main component and adapted to cooperate with the ruflling blade in forming tucks in the fabric during quiescent periods of the feeding means, and to hold down the newly formed tucks after retractionl of the ruining blade and during progression of the fabric.

2. In a sewing machine, a fabric support; a needle; means for intermittently feeding fabric on the support past the needle; a reciprocating rufling blade to form tucks in the fabric during quiescent periods of the feed means; a presser bar subject to a relatively heavy spring pressure; and a presser foot comprising a heel component pivoted to the presser bar with capacity for up and down movement, and a toe component pivoted to the heel component and subject to a relatively light spring for capacity to yield independently in receiving tucks successively formed and advanced therebeneath by the ruifling blade for Ypenetration by the needles Yand to hold the newly formed tucks after retraction of the ruiliing blade and during progression of the fabric.

3. A presser foot for sewing machines comprising a heel component pivotally connected to a supporting presser bar with capacity for vertical movement; a toe component pivotally connected to the heel component on an axis different from the pivot axis of said heel component for capacity to move independently up and down; and a t 5. In a sewing machine, a fabric support; a i

needle; means for intermittently-feeding fabric onthe support past the needle; a reciprocating ruflling blade to form tucks in the fabric during the quiescent periods of the feeding means; a v

presserr bar subject to relatively heavy spring pressure; and a presser foot with an upwardly inclined front end to cooperate with the ruiiling yblade -in forming the fabric tucks, said presser foot having a heel component pivoted for up and down movement tothe presser bar, and a toe component pivoted to the heel component and subject to a relatively light spring pressure with capacity to yield independently in receiving the tucksrsuccessively formed and advanced therebeneath by the ruflling blade for penetration by l the needle, and to hold the newly formed tucks after retraction of the ruiliing blade and'during progression of the fabric. A

6. In a sewing machine a fabric support; a

on the support past the needle; a reciprocating ruiing blade to form tucks in the fabric during ,the quiescent periods of the feeding means; a

presser bar subject to a relatively heavy spring `G5 needle; means for intermittently feeding fabric pressure; and a presser foot with a heel component pivoted for upV and down movement to the presser bar, and with a toe component pivoted to the heel component and subject to a Having thus described myV inventionj claim; relatively light spring for capacity to yield independently in receivingl the tucks successively formed and advanced therebeneath by the rufing blade for penetration by the needle, and to hold the newly formed tucks after retraction of the ruling blade and during progression of the fabric, said toe component having an upwardly inclined front end to cooperate with the ruiiling blade in forming the fabric tucks, and a guard at one side to guide the edge of the fabric.

7. In a sewing machine, a fabric support; a needle; means for intermittently feeding fabric on the support past the needle; a reciprocating ruiing blade to form tucks in the fabric during the quiescent periods of the feeding means; a presser bar subject to a relatively heavy spring pressure; and a presser foot with a heel component pivoted for up and down movement to the presser bar7 and with a toe component pivoted to the heel component and subject to a relatively light spring for capacity to yield independently in receiving tucks successively formed and advanced therebeneath by the ruiiling blade for penetration by the needle, and to hold the newly formed tucks after retraction of the ruiiiing blade and during progression of the fabric, said toe component having an upwardly inclined front end to cooperate with the miliing blade in forming the fabric tucks, and a laterally adjustable guard to guide the edge of the fabric.

8. In a sewing machine, a fabric support; a needle; means for intermittently feeding fabric on the support past the needle; a reciprocating ruling blade to form tucks in the fabric during the quiescent periods of the feeding means; a presser bar subject to a relatively heavy spring pressure; and a presser foot comprising a heel component pivoted for up and down movement to the presser bar, and with a toe component pivoted to the heel component and subject to a relatively light spring for capacity toyield independently in receiving the tucks successively formed and advanced therebeneath by the ruilling bladefor penetration by the needle, and-to hold 'Y the newly formed tucks after. retraction of the ruffling blade and during progression of the fabric, and an adjustable set screw engaged in the presser bar for limiting the movement of the heel component about its pivotal connection with said bar.

9. A presser foot for sewing machines comprising a heel component pivotally connectedto a supporting presser bar with capacity for vertical movement; and a toe component, with an upwardly inclined front end, pivotally connected to the heel component on an axis different from the pivot axis of said heel component for capacity to move independently 11p and down; and a spring to yieldingly resist upward movement of the heel component.

10. A presser foot for sewing machines comprising a heel component pivotally connected tov GRovER, c. COOPER.