US1780742A - Sewing-machine bobbin - Google Patents

Description

Nov. 4, 1930. R. K. CLARK SEWING MACHINE BOBBIN Filed Jan. 12, 1929 INVENTOR ATTORNEY5 Patented Nov. 4, 1930 'I'UNITEDI'STATES PATENT oFFI ROBERT K. CLARK, OF SPRINGFIELD, MASSACHUSETTS, AssIeNoRTo THE AMERICAN THREAD COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY SEWING-MACHINE BOBBIN Application filed January 12, 1929. Serial No. 332,119. v

within the friction device and preferably.

there is a friction device upon one end only of the bobbin. In the preferred form the thread mass is wound upon a tubular-core,

I one end of which is crimped so as to secure one thread contacting disk and a superimposed friction member, while the other end is crimped so as to secure the contactlng disk at the other end of the bobbin.

The following is a description of an embodiment of my invention reference belng had to the accompanying drawing, in which:

Figure 1 shows partly in section and part-' ly in side elevation a bobbin embodying my invention in its preferred-form;

Fig. 2 is an upper plan view of the same. Referring more particularly to the drawings, 2 is a cylindrical core of cardboard or other suitable material having wound there- 0 on a mass of thread 4 so as to form a cop, the winding being of the well known universal type so as to be self-supporting. 6-6 are end pieces having central perforatlons through which the ends of the core pass and inturned edges 88 which are yieldingly held against the peripheries of the ends of the mass 4. 10 is a centrally perforated friction disk, being a saucer-shaped member pressed up from sized paper-or othersuitable material and given a-positive set, the same being resilient so as to tend to return to the shape shown in Fig. 1, when its periphery is moved toward the thread mass 4. This periphery 12 is circular and when the bobbin is Within the shuttle chamber. bears against one end of the chamber with a spring pressure so as to produce a drag upon the bobbin preventing its throwing when the machine is in operation. The end 14 of the core passes through the lower disk 8 and is crimped over which the central portion of The bobbin is so as to hold that disk in place, while the end 16 passes through'the upper disk 8 and themember 10 and is crimped so as to hold both those two members in place. The upper disk 8 is provided with a central depression into the member 10 extends. The plane of the edge 12 is located a considerable distance beyond the crimped end 16 of the core and for some distance from its periphery. it is spaced away from the thread mass 4 and the adjacent disk 8 so as to be unsupported. The intermediate portion of the upper disk 8 contacts with the intermediate portion of the member 10 and assists in the return of the member 10 to its original position after the edge 12 has been pressed toward the thread mass 4.

As will be'evident to those skilled in the art my invention permits Various modifications without departing from the spirit thereof or the scope of the appended claims. What Iclaim is: I

l. A sewing machine bobbin comprising a core, a mass of thread wound thereon into copform, a resilient disk secured to one end of said core and having its edge located in a plane beyond the end of said core, the rear side of said disk being unsupported for a considerable distance fromits periphery.

2. A sewing machine bobbin comprising a core, a mass of thread wound thereon into cop form, a resilient disk secured to one end of said core and having its edge located in a plane beyond the end of said core, the rear side of said disk being unsupported for a considerable distance from its periphery, said disk being normally saucer-shaped.

3. A sewing machine bobbin comprising a core, a mass of thread wound thereon into cop form, a resilient disk secured to one end of said core and having its edge located in a plane beyond the endof said core, the rear side of said disk being unsupported for a considerable distance from its eriphery, and two disks having inturned edges engaging the ends of said thread mass, one of said en'- gaging disks lying between said resilient disk and said mass.

' 4. A sewing machine bobbin comprising a core, a mass 0 thread wound thereon into cop- January, 1929.

form, a resilient disk secured to one end of said core and havin its edge located in a plane beyond the end of said core, the rear side of said disk being unsupported for-a considerable distance from its periphery, and two disks having inturned edges engaging the ends of said thread mass, one of said engaging disks lying between said resilient disk and said mass, and having a reentrant central portion into which said resilient disk extends.

5. A sewing machine bobbin comprising a core, a mass of thread Wound thereon into cop form, a resilient disk secured to one end of said core and having its edge located in a plane beyond the end of said core, the rear side of said disk being unsupported for a considerable distance from its periphery, and two disks having inturned edges engaging the ends of said thread mass, one of said engaging disks lying between said resilient disk and said mass, the ends of said core being crimped so as to hold said three disks.

6. A sewing machine bobbin comprising a core, a mass of thread wound thereon lnto cop 'form, disks engaging the ends of the thread mass and held against the thread mass by crimping of the outer ends of the core, said core and disk'being made of paper, and a saucer-shaped disk secured between one of the first mentioned disks and the adjacent crimpled end of the core, said saucer-shaped disk being made of paper of the requisite resiliency so that when the bobbin is in operation in the shuttle it produces afriction or drag to prevent the bobbin from overrunning.

In testimony whereof, I have signed my name to this specification this 3rd day of ROBERT K. CLARK.

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