US18904A - Improvement in sewing-machines - Google Patents

Description

G. w. HUBBARD.

Sewing Machine.

Patented Dec. 22, 1857.

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UNITED STATES- PATENT OFFICE.

GEORGE XV. HUBBARD, OF VEST MERIDEN, CONNECTICUT.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 18,904, dated December 29, 1.857.

To aZZ whom it may concern:

Be it known that I, G. \V. HUBBARD, of \Vest Meriden, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Sewing- Maehines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a front view of a machine with my improvements, with the table on which the material to be sewed is supported, in section. Fig. 2 is a central vertical section at right angles to Fig. 1. Fig. 3 is a plan view of the table, the needle, and the looper. Figs. 4 and 5 are front views, illustrating the construction and operation of the needle.

Similar letters of reference indicate corresponding parts in the several figures.

This invention consists in a forked needle, constructed and operating as hereinafter described, with a single thread, to produce what is known as a chain-stitch seam.

To enable others skilled in the art to make and use my invention, I will proced to describe its construction and operation.

A is a stand, to which all the working parts of the machine are attached.

E is the table, on which the material 1) to be sewed (shown in grey outlines) is supported during the operation.

F is the spring-pressure pad, for confiningthe material to the table E, secured to the stand.

B is the needle-bar, to the lower end of which is attached the needle C, the said bar being fitted to slide vertically in guides a (I, attached to the stand, and having a cross-head, 1), containing a transverse staight slot, 1), to receive a pin, a, which is arranged eccentrically upon a disk, D, that is attached to the front end of the horizontal main shaft I. The rotary motion of the pin 0 in the slot b produces a reciprocating motion of the needle-bar. The forked needle C has one prong, (1, longer than the other one, 0, the longer prong, (I, being a straight continuation of the stem of the needle, and terminating in a sharp point, and the shorter prong, 0, being slightly curved outward and pointed at its extremity, which in clines toward the prong J, but does not touch the latter prong until pressed against it, and springs away from it again as soon as left'free. The normal condition of the needle is represented in Figs. 1 and 5, and Fig. 4 shows it with the fork closed by pressure against the prong e.

The spring-pressure pad F, which is made with its foot-piece much thicker than those generally used in other machines, has an opening, f, in the front, through which and through an opening, q, in the table E below,

the needle works, and on one side of this opening f,there is arranged a stationary presser, n, with which the prong 0 comes incontact in its descent before the point of the said prong arrives at the material, and by which the point of the said prong c is forced into contact with the prong d, to enable the said prong to. pass through the hole which has been made in the material by the prong d.

The presser a consists of a screw with along taper head screwedhorizontally into the pressure-pad so far as to bring opposite the needle such portion of the taper head as is of the proper size to cause the prong e to close. On that side of the opening f in the pressure-pad next which the long prong (Z of the needle works there is a slight recess for the needle to work in, said recess serving not only as a guide to the needle, but to enable it to pass behind the thread, as will be presently explained, and the front and lower portion of the same side of the said opening f is beveled, as shown at i in Figs. 1 and 2, and indicated by a dotted line in Fig. 3. At the back of the opening f in the foot-piece there is an eye, g, through which the thread is conducted to the needle from a spool, '71, which is arranged to rotate on a stationary axle, 7', attached to the stand A.

G is the feeder,consisting of alevcr attached to the front of the stand A by a stationary ful cram-pin, k, and having its lower extremity serrated in such a way as to take hold of the material upon the table and move it along when a vibratorymovement is given to the lever. The lever is fitted to its fulcrum-pin with a slot, which allows it to move up and down thereon, as well as vibrate, and in the upper arm of the lever there is a slot, at, which receives a pin, Z, that is attached to the crosshead, the said slot being a little shorter than the stroke of the crosshead produced by the revolution of the pin 0, and being straight for the whole of its length, except a portion at and near its upper end, which is curved. The action of the pin Z in the slot m of the lever has the effect of giving the lever a longitudinal or vertical motion as well as a vibrating motion. As the pin Z descends it strikes the bottom of the slot and pushes the lever down longitudinally far enough to bring the serrated end into contact with the material on the table E, and as it rises it produces no movement of the lever till it reaches the curved upper portion of the slot, when it moves it in the direction of the arrow 6, (shown near the lower end in Fig. 1,) and causes the serrated lower end of the lever to movethe material, and as the pin Zstrikes the upper end of the slot it lifts up the lever longitudinally and removes it from contact with the material. As the pin Z descends again,

-the serrated lower end into contact with the cloth again, as above described, and the lever remains stationary inthis latter condition until the pin ascends to the curved part of the slot, when it operates, as before described, to move the cloth again.

The operation of the needle to make the stitches is as follows: The end of the thread from the spool h, which is shown in red color,

is conducted through the eye 9 from the back of the pressure-pad and led by the fingers of the operator round that side of the opening f of the pressure-pad against which the long prong of the needle works. The shaft I is then set in motion to operate the needle, and as the needle descends the point of the prong (1 passes between the thread and the adjacent side of the opening f, as shown in Figs. 1 and 3, followed by the prong e, which passes on the opposite side of the thread,which is thus brought within the fork of the needle. The prong e,

means the thread is taken through the cloth in pletes its ascent, though not till the latter has been withdrawn from the material p, and the loop,which up to that time has hung vertically below the material in the position in which the needle left it, is drawn by the feed movement over the edge of the opening q, and thus caused to be thrown up to a position nearly parallel with the face of the material 12, as shown in Fig. 4, so that the needle in its neXt descent may pass through it and carry through it the newloop. The feed movement of-the material 19 draws the thread which is between the upper surface of the cloth and the eye 9 againstthe beveled corner '5 of the opening f in the pressurepad, and the form of this corner tends to throw it forward, so as to leave more room for theprong d of the needle to pass behind-it on its neXt descent, and thus insure the operation of forming the loop. The repetition of the above operation produces the seam,which may be continued to an indefinite length.

Having thus described my invention, I will proceed to state what I claim and desire to secure by Letters Patent:

The forked needle, constructed and operating, substantially as described, to enchain the loops on the opposite side of the cloth or other material to that on which it enters.

GEORGE WV. HUBBARD.

Witnesses:

- M1011. HUGHES,

W. Tusorr.

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