US1579550A - Sewing machine - Google Patents

Description

April 6 @1926. 1,579,550

' W. B. LONG .ET AL.

SEWING MACHINE F d May 19, 1924 4 Sheets-Sheet 1 April 6, 192 1,579,550

w.- B. LONG*ET AL I SEWING MACHINE Fil d May 19 192 4 Sheets-Sheet 2 1 sur I l 5% I I; I q i-"l April 6 ,1926.

I. B. LONG ET AL. I

SEWING MACHINE Filed May 1924 Patented Apr; 6, 926.

' v winnmm B; Lona; AND N rr AN n; m omor cmcmo', rnmiiors, ns s reflmbns "no r 'UNI N C ILLINOIS.

MncHrNn ooMraNit, or onicneo, Immoral 'conronn'rronfor snwmo MACHINE.

7 '0 all 'w/wmit may-concern: I

f Be it known that we, lViLLiAM' B. Leno: and NATHAN E. HANsoN,-,citizens of the United States, residing at vChicago, in the county of Cook; State of Illinois, have vi11- vented ecertain new 1 and useful Improvements in Sewing Machines,- of which the-following is r a description, reference :being had to the accompanying drawing and: tothe ,inachine taken 19 figures of reference -marke'd thereon. 'The 'invention relates to new a'ndiuseful improvements in sewing machines, and, more a particularly to: a two-needle overedge sew the innerneedle, orneedle which penetrates the fabric and moves said thread toward the front ofthe'machine-where it-can'be engaged by a hook, and the hook carries the needle thread laterally to a position where it may be'entered by the other needle, that is; the

needle-which goes over the edge; Such'a machine is shown andidescribed inthe .pat-

V 'ent granted February-19,191 8 't'o Robert R;

object ofthe present: invention is to provide a rigid bracket structurewhich is capable of. supporting both the oscillating finger and the. oscillating hook, which bracket structure is adapted-to be attached These and other to an ordinary two-needle sewing head, and. which bracket structure operatestov'insure the proper 'co-ordination and alinement-of,

objects williiri part be 7 obviousand will in partlbe hereinafterniore any disclosed. i I

Inthe drawings which show :by way of ;illustration one embodiment of the inven- .tionigure 1 isa frontlview-of In achine561 1- bodyingour improvements, the work 511}?- port being omittedfor the sake of clearnes'sl;

w F- ig. 2-is a horizontal sectionalQview' of the work snpppr j sectional view the line j 4 sa'ai t i s wi g he needles,}the I i di ely el e l litli thread finger andjthread' hook with the h ead finger at the rear end of its stroke, and the thread'hook at the lefth and end of itsstrok q Fig. 5 is a similar view but showing the finger as having moved across the pathof the needle carryingtheftlireadfof the lefthand needle toward the front of the machine, and thehook as havingrbeen retra'cted to engage this thread; I i l i ciently sons to position the loopofthe left; hand needle thread carried thereby. for the righthand needle ,to center betweenthe a, "-strandsthereof, and f r Fig. 7 -isa; plan View of thelever for carrying thethre'ad hook; I p r 5a- The mach'ne to,which. -our invention is needlebar'is reciprocatedby means of a needle lever-5 which is connected to the needle .bar by a link 6. ,The needle-lever'is oscillated by an eccentric strap -7 which cotheflower part of the standard 2 and in the :bracket 10 at the front end of'the machine. The bracket '10 ,serves as one of the supports f *for a cloth plate; -T-his needle bar is "pro- ,vided'withtwo needles 11 and 12. Cooperating withzthe needles 11 and-12 beneath the work support is a thread carrying looper 1 3.

Fig. 6 shows thehook moved sufliap'pliedgconsists of a bed plate lv having a standard 2 carrying an overhanging arm 3 on which a needle bar 4 reoiprocates. Said Said thread-carrying lo'operis given an os- :loops'land is also moved laterally so as to avoid-the needles. The. lateral movement of cillati'on into and out oftheneedle threadv I the looper is secured through a yoke 14 which cooperates with an eccentric on the main shaft 9. The oscillations of the looper are derived from a reciprocating rod 15 which is connected to the looper by means of a-forked arm 16 and pivoted block 17.

'looper is given an extended dwell at the forward end of its stroke. This arrangement broadly of links and levers is shown, described and claimed in our co-pending application Serial No. 714,299, filed of even date herewith. The specific construction of "links, levers and arms for accomplishing this purpose, form no part of our invention, but are shown, described and claimed inan application filed by Roy W. Redin, Serial No. 715,416, of even date herewith.

The present invention as has been suggested above has to do entirely with the stitch forming elements above the work support. Associated with the needles is a finger 24 which is adapted to move across the path of the lefthand needle and carry the lefthand needle thread toward the front of the machine. Associated with this finger is a thread hook 25 which moves in a direction substantially at right angles to the direction of feed, and this hook engages a thread of the lefthand needle moved toward the front of the machine by the finger 24 and carries it laterally into position for the righthand needle to enter the same.

The thread finger 24 is carried by a lever 26 (see Figures 1 and 3). The lever 26 is mounted on a fulcrum pin 27 passing through the ears 28 and 29 of a bracket member 30. The work is held on the cloth plate by means of a presser foot 31-. This presser foot is carried by a presser bar 32.

'The bracket is mounted on the presser bar. Said presser bar extends through a bearing bracket 33 and a bearing bracket 34. A guide bar 35 slides vertically in the lugs 36 and 37. This guide bar and the presser bar are connected. by means of an arm 38 so that they move up and down together. The purpose of the guide bar is to prevent the presser bar from rotating in its bearings. At the upper end of the bracket 30 there is a projecting split lug 39 through which the presser bar extends, and said lug is clamped tightly to the bar by means of a screw 40. The bracket 30 depends below the bearing bracket 34 and the lug 37. The presser bar has a flatside 32 so'that when the split bearing 39 is set up against the presser bar it will be held rigidly from oscillating on said bar.

The upper end of the lever 26 is connected to a link 41 at 42. The other end of the link 41 is connected to a ball stud 43 mounted on the finger 24 to move outwardly across :the path of the lefthand needle as has been ,re-

ferred to above. This particular link oper ating mechanism for the finger is shown :in the patent'to Hughes abovercferred to. Inasmuch as the bracket is mounted on the presser bar, when the presser bar is lifted, the lever 26 will also be lifted,-so that the thread finger maintains a predetermined position relative to the presser foot.

The thread hook 25 18 carried by the'lever 47.

The inner end of this lever 47 extends between the perforated lugs 48 and 49 formed in the lower part of the bracket 30 and is pivotally mounted therein by means of a pivot pin 50-which is clamped to the lever. The lever is oscillated on the bracket 30 by means of a link 51 which is pivoted at its inner end .to aball stud 52 carried by the arm 53 of the lever 47. The rear end of the link 51 is pivotally connected to a ball stud 54 which is fixed vto the upper end of a lever 55. The lever 55 is mounted on a short shaft 56 carried by a bracket 57 secured by means of screws 58 58 tothe bed plate of the machine, Said lever 55 intermediate -its ends carries ,a projecting ball stud 59 to which an eccentric strap 60 is connected. Said eccentric strap-6O cooperates with an eccentric 61 on the main shaft 9. It will thusibe seen that as the main shaft 9 rotates, the lever 55 will be oscillated back and .forth, and. through the link 51 will sw'ingthe lever 47 carrying the thread hook 25. Thus it is that we are able to get a very direct drive for the tln'ead'hook from the main shaft beneath the work support and at a point closeto the forward end of the shaft, so that the parts for operating the thread hook are comparatively short and comparatively few and are positive in their actions, whereby the machine may be driven at high speed, with little or no undesirable vibration in the parts. The material is moved across the work support by means of a feed dog 62- carried by a feed bar 63 of the usual construction. The presser bar may be readily raised and lowered carrying with it the lever supporting the thread hook, so that the thread hook always oscillates in a definite position relative to the presser foot. J The link 51 is pivotally connected to'f the lever the-parts ma be made without departing from the spirlt of the invention set forth in the appendedclaims.

' Having thus described the invention,-what '1 we claim as new and desire to secure by Letters-Patent, 1s

f1; A sewing -machine including a" bed plate, a work support, a presser foot for I holding the material on the work support, a presser bar carrying said presser foot, a pair of needles, a threadcarrying looper cooperating with said needles beneath the,

work support, a thread finger movable across the path of one of saidneedles for deflect ing the thread thereof in front. of said needle, a thread hook for engaging said deflected thread and formingaloop therein'for the other needle to enter, a lever supporting and operating saidfinger, a lever supporting and operating said hook, and a single unitary bracket having a lug on which one of said levers is mounted and having an independent lug on which the other lever is'mount-f ed, said bracket being carried by the presser bar and movable up and down therewith.

2. A sewing machine including a 7 bed plate, a work support, a presser footfor holding the material on the work support, a presser bar carrying said presser foot, a pair of needles, athread carrying looper cooperating with said needles beneath the work supp0it, 3 thread 7 finger movableacross the path of one of said-needles for deflecting the thread thereof in front of said needle, a thread hook for engaging said'de fiected threadjand forming a loop therein,

for the other needle to enter, a lever oscil lating in a vertical plane and supporting and operating said finger, a lever oscillating in a horizontal plane and supporting and operating said hook, a single unitary bracket having alug on which one of said levers is mounted and an independent lug on which the other lever ismounted, said bracket being carried by the presser barand movable up and down therewith, a needle bar, and means actuated by said needle bar for swinging said lever carryingsaid finger.

3. A sewing machine including a bed plate, a work support, a presser foot for holding the material on the work support, a presser bar carrying said presser foot, a pair of needles, a thread carrying looper 00- operating with said needles beneath the work support, a thread finger movable across the path ofone of said needles for deflecting the thread thereof in front. of said needle, a thread hook for engaging said deflectedfor theother needle to enter, a lever supthread and-forming a looptherein' for the i other needle to enter, a lever supporting and 55' by the ball stud 54." Thisballs stud is so 7 located that the link' 51' may turn "thereon when tliepresser bar is raised and lowered. It is obvious thatminiorj chaiiges in the details of -construction and arrangementof v r "saidjbracket havinga pair ofvertically'rar- "i'anged'bearing lugs, -and a short vertical shaft mounted in said bearinglugs on which! operating 1 said finger, jlever imp porting and operating said hook, a s-ingle unitary bracket on' which said levers are mounted; said bracket being 1 carried by the" presser bar and movable up and down therewith,

work support, a "thread finger movable 85, v

across the path 'of one of said needles for deflectingthethread thereof in front of said needle, a thread hook for engaging said defiected thread and'forming'a loop therein porting and operating said finger, a lever supporting and operating said hook-,a single unitary bracket on which said levers are mounted, said bracket being carried by the presser bar and movable up and down therewith, said bracket having a pair of ve1tical 1y arranged bearing lugs, a short vertical shaft mounted in said bearing lugs on which said lever carrying said hook isfixed, a pair of horizontally arranged lugs carried by saidbracket, and a short shaft carried by said lugs on which the lever carrying the vfinger is mounted.

5'. 'A" sewing machine including a bed 7 pair of needles, a thread carrying looper cooperating with said needles beneath the thepath of one'of saidneedles for-deflecting the thread thereof in front of said needle, a thread hook. for engaging said deflect -ed thread and forming a loop therein for the other needle to enter, a'lever supporting 115 and operating said finger, a lever supporting and operating said hook, a singleunitary bracket on which said levers are mounted, said bracket being carried by the presser bar and movable up and down-there- 120 bracket beneath the work support, a lever 125 V mounted on said bracket, a link connecting the upper end of said lever to the lever car-. rying the hook for oscillating the hook, a main shaft, beneath the work support, and

an eccentric rod operated therebynand con 9 plate, a work support,' a presser foot for 0 holdingthe material on the work support, a presser bar carrying said presser foot, a

{work support,-a thread finger movable across nected to said lever for oscillating the hook.

6. A sewing machine including a bed plate, a work support, a main rotating shaft beneath the Work support, an overhanging arm, a needle bar mounted in said arm and carrying a plurality of needles, a thread finger above the Work support for engaging the thread of one of said needles and defleeting it in front of the needles, a thread hook adapted to engage said deflected thread and form a loop therein for the other needle toenter, a lever adapted to swing in a horizontal plane on which said hook is nounted, a bracket on said bed plate beneath the Work support and adj acentthe stitching element, a lever mounted on said bracket; and projecting above the Work support, a link for connecting the upper end of said lever to the lever carrying the thread hook, an eccentric on the main shaft, and an eccentric rod operated thereby and connected to the lever pro ect-1ng above the Work support for oscillating the same.

In testllnony whereof, We afiix our signatures.

lVILLIAM B. LONG; V NATHAN HANSON.

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