US41527A - Improvement in sewing-machines - Google Patents

Description

UNITED STATES 1 PATENT OFFICE.

NVARREN MILLAR, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SEWING-MACHINES.

Specif cation forming part of Letters Patent No. 41,527., dated February 9, 1564; autedated4 February f3, 1864.

To all whom 'it may concern.:

Be it known that I, WARREN MiLLAR, of Chicago, in the county of Cook and State of Illinois, have invented anew and useful metllod or means ot' supporting the bobbin containing the interlocking thread and of checking or controlling the loop of needlethread in a rotating-hook sewing-machine; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had tothe annexed drawings, making part of this speciiication, and to the letters of reference marked thereon.

Figure 1 is a face view of the slide-ring used on rotatinghook sewing-machines to hold the bobbin containing the interlocking thread in the excavation in the face of the rotating-hook disk. Fig. 2 is a side elevation ot' the slidering. Fig. 3 is a birds-eye view of the rotating hook, slide-ring, and bobbin. Fig. 4 is a front elevation ofthe rotating hook, slide-ring, and bobbin, and section of cloth-plate and needle-arnn, part ot' the slide-ring being broken away.

Rotating-hook sewing-machines are now in such .common use that nearly all mechanics and operatives are familiar with their 0peration. lt will Aonly be necessary, therefore, to describe my improvement and its mode of operation to enable others to make and apply the same.

ln rotating-hook sewing-machines the hohbin containing the interlocking thread rests in an excavation in 'the face ofthe rotating-book disk. The rapid motion of the rotating hook during the process ot' sewing causes friction on the bobbin, and thereby tension on the thread. The tension thus made is too strong for thin elastic or sleazy goods, making the line of sewing liable to pucker and break. To

.obviate this objection is one object of my in- Ven tion.

In rotating-hook sewing-machines somel method is necessary for checking or controlling the needle-thread after it has been extended by the hook, to enable the hook in its rotation to pass out of the loops of the thread without becoming entangled therewith. The most successful devices heretofore used either wear out and require readjustrnent or are ext pensive and difficult to construct and apply.

a, Figs. l` 2, and 3, is a strap of thin steel, fastened to the slide-ring, forming a socket in which the heel of the bobbin tits loosely. b is a shelt on which the bobbin rests.

c is asmall projection to prevent the bobbin being drawn upward and jamming between the top ofthe slide-ring and the rotating hook.

r is the slide-ring; m, the bobbin ;p, the rotating hook. At the junction ofthe ring with its base the neck of the slide-ring iscut into at h, Figs. l and 2, for a short distance on each side and the ring twisted about one-sixteenth of an inch, so that the heel ofthe bobbin will be removed that distance from the excavation in the hook-disk, and the 'front edge of the. bobbin will project farther into the excavation of the disk, as shown in Fig. 3. The heel of the bobbin is sustained on the ring by the shaft b and strap c, the strap c forming a socket for the heel ot' the bobbin, Figs'. 2 and 3, the front edge only of the bobbin resting lightly against the back ofthe excavation in the hookdisk, Fig. 3. By this method of supporting the bobbin it is almost entirely released from friction, and a machine can be run with much less tension on the upper thread than is possible when the bobbin isvsupported in the exeavated disk, as heretofore. As the needlethread is extended and passed under the bob` bin by the rotating hook that part ot' the loop of thread passing on the front side and lower edge of the bobbin (see Fig. 4, thread shown in red) comes in contact with the strap a, and is there held in the angle `formed by the heel of the bobbin and the strap a until the point of the hook has passed out of the extended loop and has entered and begun to extend a new loop from the needle. (See Fig. 4.) Pulling the loop of thread backward and upward toward the periphery of the rotating hook,

presses the bobbin against the strap a, and the thread will beheld firmly in the angle formed by the heel or' the bobbin and theA edge of the strap a. (See Fig. 4.) Then the loop is pulled upward and toward the needle-hole in the clothplate, as is done by the hook when a new loop of thread is taken from the needle and extended, the pressure on the bobbin is relieved, and the thread glides upward between the heel ot' the bobbin and the strap a without the least difficulty.

Nota-The phrase heel of the bobbin occurring in these specifications is intended to l refer to that portion of the bobbin which may at any time be resting upon the shelf b and strap a.

Not meaning hereby to claim anything; lthat is covered by the patent of John N. Wilkins, dated September 30, A. D. 1862,

What I claim as my invention, and desire to secure by Letters Patent, is-

l. Turning` the heel ofthe bobbn away from the rotating hook and supporting it on the Vslide-ring', in the manner and for the purpose substantially as described.

2. In combination with an eye-pointed needie and the rotating hook of a sewing-machine,

WARREN MILLAR.

Witnesses HENRY BRooKEs, JOHN NUTT.

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