US2181951A - Shuttle mechanism for ring shuttle sewing machines - Google Patents

Description

Dec. 5, 1939. SCHENZlNGER 2,181,951

SHUTTLE MECHANISM FOR RING SHUTTLE SEWING MACHINES' Filed June 17, 1936 3 Sheets-Sheet l Dec. 5, 1939. A. SCHENZINGER SHUTTLE MECHANISM FOR RING SHUTTLE SEWING MACHINES Filed June 17, 1936 3 Sheets-Sheet 2 Dec. 5, 1939. scHENZlNGER 2,181,951 Y SHUTTLE MECHANISM FOR RING SHUTTLE SEWING MACHINES Filed June 1'7, 1936 3 Sheets-Sheet 3 Patented Dec. 5, 1939 UNITED STATES SHUTTLE IWECHANISM FOR RING SHUTTLE SEWING MAGHDJES August Schenzinger, Brooklyn, N. Y.

Application June 17, 1936, Serial No. 85,740

8 Claims.

spools carrying about 200 yards of yarn and more may be used. Another object of the invention is to provide an improved shuttle mechanism, in 15 which the removal of an emptied yarn spool and the insertion of a new full spool can be carried out in a quick and most simple manner without taking the shuttle out of the shuttle carrier ring.

Still another object of the invention is to provide 20 arrangements, by which the tension of the thread going from the spool to the seam forming mechanism in the machine can be regulated without dismounting any parts of the shuttle mechanism, so that the machine operator, by using such simple tool as an ordinary screw driver may re-set the tension of the thread to adapt it to the nature of the sewing work to be done.

In the means, which I have devised for carrying out the beforesaid and other objects of the invention, it is a most important feature, that my new and improved shuttle mechanism may be put into any old sewing machine of the ordinary standard types, for instance Singer or White; no rebuilding or alteration of the old machine is 35 necessary; and the exchange of an old shuttle mechanism against my new one may be done within a few minutes time, as in certain standard sewing machines, such as for instance the Singer, only two screws are to be unscrewed and to be screwed on again, in order to carry out the exchange of the two shuttle mechanisms.

In order to make clear the nature of the present invention, I have shown in the drawings a preferred embodiment of my new and improved shuttle mechanism, such as would fit for instance into the normal Singer sewing machine. In the illustrations of the shown embodiment:

Figure 1 is a front elevation of the device, show- 50 ing the new improved shuttle and the parts contained therein;

Figure 2 is a top view of the device seen in the direction of the arrows 22 in Figure 1;

Figure 3 is a bottom view of the device, seen in 55. the direction of the arrows 33 in Figure 1;

Figure 4 is a side view of the device, seen in the direction of the arrows L4 in Figure 1;

Figure 5 is a front elevation of the new improved shuttle alone;

Figure 6 is a bottom View of the shuttle alone; 5

Figure '7 is a side view of the new improved spool housing, to be inserted into the shuttle of Figs. 5 and 6;

Figure 8 is a perspective view of the new improved spool housing; 7 V

Figures 9 and 9a show the thread-tensioning plate to be fixed on the spool-housing, Figure 9 being a perspective view, and Figure 9a being a side-view, seen from the right side of Figure 9;

Figures 10 and 11 are front elevations of the the essential parts of the device in its position as (not shown) parts of the sewing machine, the

construction and operation of which parts is as usual. The shuttle of my new device is likewise similar to the standard Singer machine, in so far, as it forms an approximately sickle-shaped casing (as shown in Figure 5) with the face- wall 33 and 35. the rear-wall 33 only partly developed, with a circumferential guiding rib 2'5, which extends from the shuttle tail-end 28 to the head-end 29, which in the usual manner is provided on its one side with slight slantings I 29 to let pass the needle, and which is further provided with the loop-picking beak 3B, and the loop-spreading shoulders 3!, between which latter the usual broad slanting ditch 32 is arranged, through which the needle reciprocates. The shuttle of my device differs however from the usual ring shuttles of the same type, in that point, that my shuttle is very much broader than all the known other shuttles of the same diameter, the greater breadthof my shuttle being necessary, in order to provide in it enough room for a correspondingly broad spool housing and yarn spool. In my new device the ratio of the breadth of the spool to the diameter of the spool is approximately 2:3; and in a similar manner the ratio of my spool diameter to my shuttle diameter amounts to 2:3, whereas in the usual Singer machine of the same type the ratio of the spool breadth to the spool diameter is only 1:2, and the ratio of the spool diameter to the shuttle diameter is likewise only 1:2. The use of such larger and broader spools in my machines as compared to Singer and other machines of the same size accounts for the considerably greater length of thread in my machine;

but the use of such larger and broader spools in my machine is made possible only by the excentric position of my spool in its shuttle, and by the different shape of the shuttle side-walls, which are adapted to the changed position of the spool.

The one face-wall of my shuttle, in the Figure 5 it is the rear face-wall, 33', is provided with a pin 3 having a shoulder at its bottom, which pin extends perpendicularly to the said shuttle wall into the interior of the shuttle, and

serves as the carrier of the central sleeve 35 of the spool housing 35, the outer cylindrical wall of this spool housing being likewise carried by machined border ledges 3'7 (see Figs. 4, 6 and 12) provided at the interior cavity of the shuttle.-

The rather large and broad but otherwise normal-' shaped yarn-spool 38 of pressed sheet metal or any other suitable material rides loosely on the central sleeve 35 of the housing 36, so as to allow the gradual turning of the spool and the unwinding of the yarn from it, while the spool housing 36 itself keeps always the same position within the shuttle, to which it is fixed.

In order to lock the spool housing within the shuttle, the spool housing 36 has, as shown in the Figs. 3 and 7, at 39 pivoted to it, a twoarmed lever M, the shorter arm of which forms a hook il, adapted to catch below a little pin 32 (see Figs. 3 and 5), arranged within the shuttle near to its tail end. The lever 10 is slightly curved, to fit snugly on the cylindrical circumference of the spool housing 36, and the longer arm of the lever is at its rim provided with a groove or slight depression 43, to serve as a grip for the fingernail, when the lock is to be opened; the end of the longer arm of the lever id is further provided with a resilient hook-shaped tongue 46, which catches in the locking position of the arm into the groove 45, which extends along inside of the shuttle below the guiding rib 21, as shown in the Figure 3. When however the lever 40 is swung up into the position shown in the Figure '7, then this lever serves as a convenient handle, for pulling the spool housing 36 with the spool 33 out of the shuttle.

The comparatively large size and breadth of the spool and of the spool housing requires special arrangements for conducting the thread from the yarn spool 38 to the place at the table plate 24 where the seam is to be made in the workpiece, which arrangements, seen best in the Figures 8 and 10 to 12, are as follows: In the cylindrical wall ll of the spool housing a slot 46 extends from the open side of the spool housing obliquely over a part of the cylindrical wall 41 of the housing, and from the widened end 48 of this slot extends a flat groove 49 in the same oblique direction as the slot it over the rest of the cylindrical wall t! up to the rounded edge 50, in which the cylindrical wall t? joins to the face wall 35. At the point of edge 58, where the groove 49 ends, starts another flat groove 5|, which extends on the face wall 36 of the spool housing to a point 52, which in the assembled shuttle arrangement is situated in the axis of the shuttle carrier ring 2| (see Figs. 10 and 11).

The surface of the face wall 36 is further provided with a slightly slanting depression 53, which, as a broadening zone, extends from the meeting point of the two grooves 49 and 51 across the whole face wall 36, the purpose of this de pression being to facilitate the threading of the shuttle mechanism, because the thread, in passing over the face wall 36, must be brought into the narrow space between the face wall 36 and the thread-tensioning plate 55.

At the meeting point of the two thread guiding grooves 49 and 5! extends a small pin 56 slightly above the rounded edge 58, which pin prevents the yarn thread from jumping out of the two grooves 49, 5! in consequence of the movements of the yarn housing, when the latter rotates with the shuttle.

The thread tensioning device consists in an irregularly shaped thin and elastic plate 55, see Figure 9, which plate has three flaps 56, 51, 58, and a countersunk hole 593 for the screw 69, which screwserves at the same time for fixing the plate 55 to the face wall 35 of the spool housing, and for regulating the tension of the thread. In Figures 9 and 9a the dotted lines 5! indicate the imaginary flat plane of the plate 55 the contour of which flat plane in the perspective View of the Figure 9 takes the shape of a partial ellipse; the flap 5t and the adjoining part of the plate 55 near to the hole 59 are bent upwardly from this flat imaginary plane 68, but the extreme end of this flap 56 is again bent down slightly; the flap 5?, in particular its pointed or sharp cornered end, is bent downwardlybelow the imaginary fiat plane 6i the narrow slot between the two iiaps 56 and 51 is at its inner end 52 somewhat rounded up, which arrangement, in combination with the before described shape of theiiap 56 serves to keep the thread at its turning point '52,

after the thread is once threaded-in below the tensioning plate 55. The rounded lower part of the flap 5'2 and likewise the extreme end of the third flap 58 are provided each with a small pointed hook 652, which hooks catch into corresponding notches in the surface of the face wall I dii of the spool housing. In view of the just de-' corresponding change of the pressure between the plate 55 and the face wall 35, which results in a corresponding other tension of the yarn thread,

which passes between these two parts.

The before described construction results in the following very simple way of rethreading and operating of my new and improved shuttle mechanism:

A spool housing with the locking lever held raised or swung out as shown in the Figure 7 is charged with. a new full yarnspool, and the end of the yarnthread is passed through the slot 46 from the inside to the outside of the spool housing. Then the spool housing, held at the swung-out lever id, is inserted into the shuttle which is turned into the position of the Figures 5 and 6, so that the locking lever is placed within the tail end of the shuttle, and the locking lever is pressed down into the inner groove 45 of the shuttle, which movement locks the spool-housing in this position. Thereupon the end of the yarnthread is placed into the circumferential groove 49 of the spool housing, and by pressing it slightly on the face wall 36 the thread is swung round the pin 5 for the angle corresponding to the slanting depression 53, which movement brings the thread below the higher part of the tensioning plate 55 and into the slot between the flaps 56 and W, to reach the point 52. Thereupon the threaded shuttle is inserted into the shuttle carrier ring and the end of the thread is pulled up to the pas-- sage hole in the table plate 24, and the machine will be ready to start with the sewing work. When, after using up the thread on the yarnspool, the shuttle mechanism shall be re-filled, then the shuttle may be left within the carrier ring; it is only necessary to reach with a fingernail into the groove =33 of the lever M, to raise this lever again to the position of Figure '7, whereupon the spool housing with the spool can be pulled out of the shuttle, which remains within the shuttle carrier ring. The spool housing may then be re-filled, placed again into the shuttle and locked, and the end of the new thread is on the assembled shuttle mechanism brought up to the table-plate, to continue the sewing work.

It is evident that the invention is not restricted to the details of the before described construction, but may be varied within the scope of the following claims.

I. claim:

1. A ring shuttle mechanism for sewing machines, comprising a carrier ring; a shuttle rotatable within the ring and having on its inside a long concentric groove and a protrusion at the one side of this groove near to its end; a spoolhousing removably inserted into the shuttle; a yarn spool arranged exchangeably and rotatable within the said housing; and locking means for removably fixing the said spool housing within the shuttle, said locking means consisting in a double-armed lever pivoted at the peripheric circumference of the spool housing, the shorter arm of which lever has the shape of a hook, adapted to engage the before said protrusion, and the longer arm of which lever is provided with a resilient tongue adapted to engage into the before said inner groove of the shuttle.

2. A ring shuttle mechanism for sewing machines, comprising a carrier ring; a shuttle mounted rotatably within the ring; a one-side open spool housing having a cylindrical wall and an adjoining face wall, inserted excentrically and 1 removably into the shuttle, the said spool housing having a slot in its cylindrical wall extending from the open side of the housing over a part of the cylindrical wall, and having further in con-- tinuation of the slot a slight groove on the outside of the cylindrical wall, and another slight groove on the face wall extending from the end of the first said groove to a point near the axis of the shuttle ring.

3. A ring shuttle mechanism for sewing machines, as claimed in claim 2, in which the spool housing carries outside on its face wall a threadholding flat plate having a narrow slot, the inner end of which is situated at a point near the axis of the shuttle.

4. A ring shuttle mechanism for sewing machines, as claimed in claim 2, in which the face wall of the spool housing is provided, on its outer surface, with a slightly slanting depression, extending from the meeting point of the two thread conducting grooves in a broadening zone across the face wall of the housing.

5. A ring shuttle mechanism for sewing machines, as claimed in claim 2, in which the spool housing is provided, at the meeting point of the two thread conducting grooves, with a small pinlike protrusion, adapted to prevent during the rotation of the shuttle, the yarn thread from slipping out of the said conducting grooves.

6. A ring shuttle mechanism for sewing ma chines, comprising: a carrier ring; a. shuttle rotatable within the-ring and having on its inside a long concentric groove; a spool-housing re movably inserted into the shuttle; a yarn spool arranged exchangeably and rotatable within the said housing; and an arm, pivoted at the outside of the cylindrical wall or peripheric circumference of the spool housing, so as to be adapted to be swung out of the shuttle to serve as a handle for the spool housing,'or to be swung close to the shuttle and to engage into the inner groove of the shuttle, to lock the spool housing within the shuttle.

7. A ring shuttle mechanism for sewing machines, comprising: a carrier ring; a shuttle mounted rotatable within the ring; a pin fixed excentrically within the shuttle; a one-side-closed cylindrical spool housing, inserted excentrically into the shuttle and riding on the beforesaid pin, so as to be rotatable together with the shuttle; locking means for fixing the spool housing within the shuttle for joint movement of the spool housing together with the shuttle; a yarn spool inserted independently rotatable within the spool housing; and thread-conducting means on the outer circumference and on the outer surface of the side wall of the spool housing, to conduct the thread from the yarnspool over the outer surface of the housing to a point situated near the axis of the shuttle ring.

8. A ring shuttle mechanism for sewing machines, comprising: a carrier ring; a shuttle rotatably mounted within the ring; a cylindrical spool housing, detachably fixed within the shuttle and being closed at its one side by an approximately fiat wall; a yarn spool within the spool housing; a thread-holding and -tension.ing plate, hooked at two points into the face wall of the spool housing, and resting at a third point on the outer surface of the face wall of the spool housing; and a set screw engaging the said plate and the said face wall of the spool housing so as to regulate the pressure between the plate and the face wall.

AUGUST SCHENZINGER.

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