US1592235A - Bobbin-controlling adjunct for sewing-machine shuttles - Google Patents

Description

July 13 1926 1,592,235

E. J. THOMSON BOBBIN CONTRbLLING ADJUNCT FOR SEWING MACHINE SHUTTLES Filed Mar ch e, 1926 Invenfir hairs;

EDWARD J. THOMSON, OF QUINCY, MASSACHUSETTS, ASSIGNOR OEONE-HA.LF .TO ROBERT N. CORTHELL, OF -AU13UE1I, MAINE;

BGBBIN:GOhlTfiQLLlIll'GiADJUllcT FOB SERVING -1VACHINE. SHUTTLES.

Application filed March 6, 1526.

This invention relates to a sewing-machine shuttlehavinga center post on which a dismain bobbin is rotatable and movable endwise, an annular curb surrounding and con centric with the post,and a bobbin stop limiting outward movement of the bobbin on the bobbin on the post.

The object of the invention is to provide a bobbin-controlling adjunct adapted to be separably engaged by friction with the internal surface of a curb, which is not necessarily limited to a given diameter, and to cooperate with the bobbin stop in preventing loose rotation of the bobbin, and thus ensuring delivery of the thread only as required by the stitch-forming mechanism of a sewing-machine.

Of the accompanying drawings forming a part of this specification,

Figure 1 is a top plan view of a shuttle and a bobbin-controlling adjunct therein embodying the invention, the bobbin being removed.

Figure 2- is a section on line 22 of Figure 1, showing the bobbin confined between the adjunct and the stop.

Figure 3 is a view similar to Figure 2, the stop being displaced and the bobbin removed.

Figure 4 shows the adjunct in perspective, the normal form of the shoe hereinafter described being shown by full lines, and its form, when engaged with the curb, as in Figures 1, 2 and 3, being shown by dotted lines. 7

The same reference characters indicate the same parts in all of the figures.

In the drawings, 12 designates the center post of a wellknown type of shuttle. 13 designates a bobbin stop formed as an arm pivoted at 14 to the post, and 15 designates the annular curb surrounding the post and joined to the bottom 16, to which the post is also joined.

Figure 2 shows in section a ready-wound bobbin composed of a tubular core 17, and a universally wound thread mass 18 thereon.

The core loosely surrounds the post, so that the bobbin is rotatable and movable enclwise on the post. The bobbin stop is adapted to stand horizontally, as shown by Figures 1 and 2, to limit the outward endwise movement of the bobbin, and vertically as shown by Figure 3, to permit the insertion and removal of the bobbin, the usual means Serial No. 92,742.

comprises a fiexibleresilient curvedshoellt). preferably 'ofthin tempered steel, adapted to conform to, and have an elongated fric tional bearing on the internal surface of the curb. The normal curvature of the shoe,

indicated by full lines in Figure 4, is greater than that of the curb.

The adjunct comprises also a resilient pressing finger 20, preferably of the same material as the shoe, and preferably integral therewith. The finger is joined at one end to the midlengthportion of the shoe, and projects from one side thereof, viz., the reentrant side, as shown by Figure 4. The finger has a free end portion, containing an opening 21, loosely receiving the post. Said portion has also a frictional face 22, adapted to bear on the inner end of the bobbin. The adjunct is applied to the shuttle by increasing the curvature of the shoe, as indicated by dotted lines in Figure 1, and forcing it into the curb, until its inner edge contacts with the bottom 16. This operation tensions the shoe and causes it to frictionally engage the internal surface of the curb with sufficient force to confine or anchor the pressing finger in its operative position.

The pressing finger normally stands at a' maximum distance from the bottom, 16, as shown by Figure 3, so that when the bobbin is inserted and confined by the stop 13, the pressing finger is pressed inward, and tensioned, exerts outward pressure on the bobbin, and presses the bobbin against the stop. Rotation of the bobbin is, therefore, resisted by the pressing finger and the stop, so that loose rotation of the bobbin is preventedn The opening 21 is so formed that its margin cannot bind on the post when the finger is in any position it is capable of assuming. 1

It will now be seen that the shoe may conform to curbs of different diameters, so that the adjunct is not limited to use with a curb of a given diameter, and may be used with variously proportioned shuttles of the general type shown.

I claim:

For use with a sewing-machine shuttle which includes a central post on which a bobbin is rotatable and movable endwise, a bobbin stop adapted to limit outward movement of the bobbin on the post, and 21 circular curb concentric with the post and surrounding the bobbin-receiving space; a bobbin-controlling adjunct comprising a flexible resilient curved shoe, adapted to conform to, and have an elongated frictional bearing on the inter al surface of the curb, and having a normal curvature greater than that of said surface, and a resilient pressing finger joined at one end to the inidlength portion of the shoe, projecting from one side thereof, and having a free end portion containing an opening formed. to loosel} receive the post, said portion having also a frictional face adapted to hear on the inner end of the bobbin and press the outer end thereof against the stop, the shoe being adapted to be tensioned by its insertion in the curb, and conformable to curbs of different diameters. the frictional engagement of the shoe with the curb causing the shoe to anchor the pressing finger in the curb, in position to cooperate with the stop in yieldingly resisting the rotation of the bobbin on the post, the pressing finger being adapted to be tensioned by the insertion of a bobbin in the shuttle.

In testi1non whereof I have afiirzcd my signature.

EDVARD J. l.:lOMSOX.

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