US2670702A - Elastic metering attachment for sewing machines - Google Patents

Description

March 2, 1954 GALK N 2,670,702

ELASTIC METERING ATTACHMENT FOR SEWING MACHINES Filed July 29 1950 4 Sheets-Sheet l JOSEPH GALKIN INVENTQR ATTORNEY March 2, 1954 GALKlN 2,670,702

' ELASTIC METERING ATTACHMENT FOR SEWING MACHINES Filed July 29 1950 4 Sheets-Sheet 2 (\1 a o 4 O 0 q Q! m G L1. v

JOSEPH GALKIN NVENTOR ATTORNEY March 2, 1954 J GALKlN 2,670,702

ELASTIC METERING ATTACHMENT FOR SEWING MACHINES Filed July 29, 1950 4 Sheets-Sheet I5 32, 40 il lilh 7 {'26 iii" 56 26 "72-7' 54 il hlil il ii ii ii fl'hi 30 as Q 42 JOSEPH GALKIN INVENTOR ATTORNEY March 2, 1954 1 GALK|N 2,670,702

I ELASTIC METERING ATTACHMENT FOR SEWING MACHINES Filed July 29, 1950 4 Sheets-Sheet 4 Q 61 c 5T 6! JOSEPH GALKIN INVENTOR BMW ATTO R N EY Patented Mar. 2, 1954 TED STATES PATENT OFFMI-CE" ELASTIC METERING ATTACHMENT FOR SEWING MACHINES Joseph Galkin, NewYork, N. Y.

Application July 29, 1950, Serial No. 176,710

5. Claims; '1

Thi 'invention relates'to improvements in sewing. machines, and particularly to means for metering or perfectly feeding andstitching an elastic. tape toone or more layers of fabric.

It has been the practice heretofore to stretch the elastic tape by pulling it through aspring finger or between two knurled and gear'driven rollers to cause friction upon the elastic. However, the rate of stretching varies so that after sewing elastic waistbands for garments, the stitched fabric is gathered unequally-by the elastic. and the sizes of th waistbands formed are unequal.

Anobject of this invention is to provide auxiliary feeding means so that the elastic tape will beguided linearly before stitching-and attached without any slipping and so as to cause all'the elastic waistbands to be identical in size.

Another object of this invention reside in the use and the coactive relationship of a feed roller and a vertically serrated and spring-pressed shoe.

Another object of this invention is to make the feed roller hollow and to place clutch meansdirectly inside the feed roller and to drive the feed roller from the main shaft in the work sup-- porting base anddirectly at an end fac of the puller-feed roller.

With the above and other objects in view, the invention will be hereinafter more particularly described-and the-combination and arrangement of parts willbe shown in the accompanying drawing and pointed out in the claims which form part of this specification.

Reference will now be. had to the. drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which Figure l is a top planview of a sewing machine having my invention applied thereto.

Figure 2 is a front elevation of the machine shown in Figure 1.

Figure 3 shows in elevation the front end" of the machine, shown in Figures 1 and 2; the work supporting base being shown in cross-section on line 3-3 in Figure l.

Figure 4; is a top planview of a vertically serrated shoe.

Figure 5 is an end view of the shoe shownin Figure 4.

Figure 6 is a cross-sectional view'taken on line 6-4: in Figure 3.

Figure 7 isa cross-sectional view taken on line T---'! in Figure 6.

Figure 8 is a cross-sectional view taken on line 88 in Figure 6.

In the illustrated embodiment of the invention, the numeral Ill indicates the work-supporting base of a sewing machine which comprises the usual standard ll, having an overhanging hollow arm l2 with a head !3 at itsfree end.

In the head [3 is journaled a needle-bar l4 carrying'needles 5. The needle-bar I4 is reciprocated up and down by a needle lever 16 mounted on a pivot shaft IT. The needle lever I6 is connected to the needle-bar 14. A looptaker I8 is oscillated and cooperates with the needles to form stitching. The material worked upon is held down by a presser foot l9 carried bythe presser-bar 20. The presserbar rests on-a cloth plate 21 secured to and above the work support ing base M. A main shaft 22 is suitably journaled in the base portion of the machine and from which the stitch forming and feeding ele-* ments are driven, as is well known in the art. The material is moved across the work support by a feed dog 23 which i moved back and forth and up and down in the usual manner.

This invention is directed to mechanism for guiding and feeding an elastic tape 24 to the presser foot I9 and to the feed dog 23. Also for stretching the elastic tape uniformly. This mechanism is identified by the numeral 25 and comprises a right-angular bracket 26 having an upright leg 2'! fixed by bolts 28 to the rear base portion 29 of the work-supporting base l0.

The bracket 25 has a horizontal leg 38 which extends forwardly below and to a position infront of the overhanging arm 12.

At the front of the hollow arm (2, the hori zontal leg 30 terminates in an upright extension 32 having a clutch shaft 33 fixed therein by screws 34. The bracket extension 32 terminates in a hub 35 having a shoe supporting shaft 36 fixed therein by screws 37. A rod 40 is fixed in the extension 32 intermediate the shafts 33 and 36 by screws 4|. The rod 40 is in superposed relation with the; clutch shaft 33.

Rotatably mounted on the clutch shaft 33 is a puller-feed roller 42, preferably having a knurled outer surface 43 and positively driven in stepby-step rotation by the main drive shaft 22. p p

As shown in Figure 3, an eccentric 44 is mounted on the main drive-shaft 22 and is fixed thereto by a screw 45. A strap 46 at one end of a connecting rod 41 is mounted on the eccentric 44. The other end of the connecting rod 41 is pivotally connected to the lower end 48 of. an upright lever 49. The lever 49 is fulcrumed on a shaft 59 mounted in a bracket 39 suitably fined to the work supporting base I0. The upper end of the lever 49 is pivotally connected at i to one end of a horizontal link 52. The other end of the link 52 is pivotally connected at 53 to the lower end of a clutch arm 54.

The arm 54 is slotted to provide adjustability of the pivotal connection between the link 52 and the clutch arm 54 for increasing or decreasing the throw or step-by-step movement of the feed-roller 42 which forms the outer shell of the clutch mechanism 55. This pivotal connection 53 constitutes means for adjusting the movements of the clutch mechanism independently of the movements of the feed dog 23 of the sewing machine.

Mounted on the shaft 30 is a bifurcated member 51 having arms 58 to the lower portion of which a rod 59 is secured by screws 60. A centrally apertured shoe GI which is preferably of hexagonal cross-section is mounted on the rod 59 and is secured thereon by a screw 62.

As shown in Figure 4, the shoe 'oI has triangular teeth 64 all along its length at the rear face 65 where the shoe contacts the knurled outer surface 43 of the feed rollers 42. As shown in Figure 5, the teeth 64 extend the entire vertical distance of one of the sides of the hexagonal outer formation of the shoe. As shown in Figure 5 the rear toothed face 65 is made concave to contact the outer periphery of the feed roller 42. The shoe BI is pressed by a leaf spring 56 against the roller 42.

Figure 6 is a cross-sectional view taken on line 65 in Figure 3 and shows the clutch shaft 33 fixedly held in a bearing portion 69 in the bracket 25 by screws 61. The puller-feed roller 42 is freely rotatably mounted on the shaft 33 and shown in cross-section.

The puller-feed roller 42 has a bore 69 in which an oscillating clutching detent carrier 69 is rotatably mounted. The carrier 69 has a hub I0. Mounted on the hub is a collar II on the clutch arm 54. A screw 12 threaded in the collar H secures the carrier 69 to the clutch arm 54. (Figure 6.)

As shown in Figure 7, the detent carrier 69 has peripheral cavities I3 in each of which a ball or roller detent I4 and a spring I5 is mounted in a manner as to cause the detent 14 to be wedged between a cam surface '11 in a cavity 73 and the peripheral surface defining the bore 08.

The detent carrier 69 and the detent i4 and spring I5 mounted inside the bore 68 of the feedroller 42 constitute a friction clutch 80.

. Stepby-step rotation of the feed-roller 42 in synchronism with the feed-dog 23 of the sewing machine is effected by the friction clutch 60. The clutch 80 is actuated by the clutch arm 54 and the lever 49 having its lower end in operative engagement with the eccentric 44 on the main shaft 22 of the sewing machine.

In order to prevent reverse movement of the feed-roller 42, I have provided a braking detent carrier 85 freely mounted within a bore 86 in the feed-roller 42, as shown in Figure 8. The braking detent carrier 85 is secured to a disk 81 by a screw 88 and to an arm 89 by a screw 90. The arm 89 is secured to the rod 40 and thus fixed to the bracket 26. (Figure 6.)

The clutch detent carrier 59 and the braking detent carrier 85 are mounted in the feed-roller 42 to work in opposite directions and may be in the form shown and described in Patent No. 1,985,406 issued to Nathan B. Galkin, dated December 25, 1934.

The metering attachment 25. in practice, operates in coacting relation with an improved trimming mechanism comprising a cutting blade 96 fixed to the work supporting base I0 and which lies parallel to the line of stitching and with its cutting edge at the upper level of the work supporting base I0.

A cooperating movable cutting blade 91 is carried-by a rocker arm 98 fixed to a shaft 99. The shaft 99 is rockably mounted in bearings I00 in a bracket IOI fixed to the base plate I I by screws I02.

The rocker arm 98 is oscillated through a link I03 fixed to the shaft 99 and through a strap arm I04 from an eccentric I5 at one end of the main shaft 22.

The movable blade 91 is substantially C-shaped and at its upper portion it coacts with the fixed cutting blade 96 to trim the right-hand edge of the fabric fed by the feed-dog 23 to the needle I5.

In order to positively clear the blades 96 and 9'! of the trimmed selvage and prevent clogging of the blades while maintaining a clear upper surface of the work supporting base I0, I provide a main chip guard I05 which is fixed to the bracket MI by screws I0'I. The guard I06 has a vertical guard wall I08 extending slightly to the rear of the cutting blades.

The guard I06 has a forwardly and downwardly inclined wall I09 which terminates in a vertical flange H0 at the front face of the base II.

A further chip guard II2 is secured to the movable blade carrier I00 and slopes laterally and downwardly into the main chip guard I 06..

The lowermost portion of the chip guard I05 extends outwardly beyond the base plate II and delivers the trimmed selvage clear of the sew-' ing machine.

a As shown in Figures 2 and 3, it will be seen that by actuating the shaft 99 at one end thereof by the link I03, that an unobstructed opening III is provided in the front portion of the base and in alignment with the main chip guard I06.

The trimmed selvage is thus constrained to move sideways from the presser-foot I9, downwardly over the sloping walls of the chip guard and entirely clear of the forward face of the sewing machine base I0. The arrangement disclosed makes possible continued operation of the sewing machine because the selvage or chips cannot reach the working parts inside the base II and are further kept away from the upper surface of the work supporting base I0 and automatically delivered outside the machine, which was not possible heretofore.

As shown in Figure 3, mechanism for guiding the tape 24 in alignment with the spring-pressed shoe SI comprises 'a tensioning guide I20 having a tensioning shoe I2I which is mounted on screws I22 in the head I3. Springs I23 on the screws I22 are tensioned by threaded nuts I24 and hold the shoe BI against the elastic tape.

A guide pin I25 is carried by an arm I20 secured by a screw I2! to the head I3. A guide finger I28 is secured to the presser foot I9 by a screw I 29 and guides the tape 24 to the feed dog 23.

In accordance with the patent statutes I have described and illustrated the preferred embodiment of my invention, but it will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as defined by claims.

the appended I claim:

1. In a sewing machine, a work supporting base, an overhanging arm on said work supporting base, a main shaft in said work supporting base, a main feeding mechanism, auxiliary feeding mechanism including a toothed puller-feed roller having drive clutch and brake mechanism directly therein, a coacting vertically serrated shoe having elongated teeth and being spring-pressed against said roller for gripping and feeding elastic strip material therebetween, said teeth being of considerable length to press a substantial portion of said elastic strip around the peripheral surface of said puller-feed roller, a bracket fixed to said work supporting base, said roller and shoe being supported from said bracket, means for guiding said elastic strip in alignment with said vertical serrations and means for operating said auxiliary feeding mechanism from said main shaft and directly at said puller-feed roller.

2. In a sewing machine, a work supporting base, an overhanging arm on said work supporting base, a main shaft in said work supporting base, a main feeding mechanism, auxiliary feeding mechanism including a puller-feed roller having drive clutch and brake mechanism directly therein, a coacting vertically serrated shoe having elongated teeth and being spring-pressed against said roller for gripping and feeding elastic strip material therebetween, said teeth being of considerable length to press a substantial portion of said elastic strip around the peripheral surface of said puller-feed roller, a bracket fixed to said work supporting base, said roller and shoe being supported from said bracket and entirely clear of said overhanging arm, means for guiding said elastic strip in alignment with said vertical serrations, and means for operating said auxiliary feeding mechanism from said main shaft and directly at an end face of said puller-feed roller.

3. In a sewing machine, a work supporting base, an overhanging arm on said work supporting base, a main shaft and a main feeding mechanism in said work supporting base, auxiliary feeding mechanism including a, puller-feed roller having drive clutch and brake mechanism directly therein, a coacting vertically serrated shoe having elongated teeth and being spring-pressed against said roller for gripping and feeding elastic strip material therebetween, said teeth being of considerable length to press a substantial portion of said elastic strip around the peripheral surface of said puller-feed roller, a bracket fixed rearward of said work supporting base and extending forwardly below and to a position in front of said overhanging arm, said roller and. shoe being supported from said bracket and entirely clear of said overhanging arm, means above said roller for guiding said elastic strip in alignment with said vertical serrations, and means for operating said auxiliary feeding mechanism from said main shaft and directly at an end face of said puller-feed roller.

4. In a sewing machine, a work supporting base, an overhanging arm on said work supporting base, a main shaft and a main feeding mechanism in said work supporting base, auxiliary feeding mechanism including a puller-feed roller having drive clutch and brake mechanism directly therein, a bracket fixed rearward of said work supporting base and extending forwardly below and to a position in front of said overhanging arm, a vertically serrated shoe having elongated teeth and being spring-pressed against said roller for gripping and feeding elastic strip materia1 therebetween, said roller and shoe being supported from said bracket and entirely clear of said overhanging arm, means above said pullerfeed roller for guiding said elastic strip in alignment with the vertical serrations on said shoe, and means for operating said auxiliary feeding mechanism from an eccentric on said main shaft and directly at an end face of said puller-feed roller.

5. Ina sewing machine, a work supporting base, an overhanging arm on said work supporting base, a main shaft and a main feeding mechanism in said work supporting base, auxiliary feeding mechanism including a hollow pullerfeed roller having drive clutch and brake mechanism directly therein, a bracket fixed to the rear wall of said work supporting base and extending forwardly below and to a position in front of said overhanging arm, a vertically serrated shoe having elongated teeth of triangular cross-section, said shoe being spring-pressed against said roller for guiding and feeding elastic strip material therebetween, said teeth being of considerable length to press a substantial portion of said elastic strip around the peripheral surface of said puller-feed roller, said roller and shoe being sup ported from said bracket and entirely clear of said overhanging arm, a spring-pressed guide mounted on said head, a bifurcated guide mounted on said bracket and above said pullerfeed roller for guiding said elastic strip in alignment with the vertical serrations on said shoe, and means for operating said auxiliary feeding mechanism from an eccentric on said main shaft and directly at an end face of said puller-feed roller.

JOSEPH GALKIN.

Name Date Weis Feb. 11, 1941 Number

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