US26234A - Improvement in sewing-machines - Google Patents

Description

I. S.- MCCURY.

Sewing Machine.

No. 26.234.- l i Patented Nov.' 22, 1859.

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UNITED STATES PATENT OFFICE.

JAs. s. MCOURDY, OF BROOKLYN, AssieNonTO J. OF Nnw YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 26,234. dated November 22, 1859.

To all whom, it may concern Be it known that I, J AMEs S. MOCURDY, of Brooklyn, in the county of Kings and 'State of New York, have invented, made, and applied to use certain new and useful Improvements in Sewing-Machines; 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 to the annexed drawings, making part of this specification, wherein- Figure 1 is an end view of my machine. Fig. 2 is a view of the shuttle-driver transversely of the bed. Fig. 3 isa side view of the shuttle-driver and feeding device, the bed being in section and Fig. 4 is a section of the spool-carrier.

Similar marks of reference indicate the same parts.

The nature of my said invention consists in a compound shuttle-driver -that acts in a very reliable manner in giving the right motion and at the right time to the shuttle, avoiding the wear on the shuttle-driver now usual, and consequently insuring a continuance of the proper timing between the needle and shuttle.

In the drawings, a is the bed of the machine.

b is the arm, carrying the pressure-foot c and needle-bar d, as usual.

e is a shaft rotated by competent power, and communicating a reciprocating movement to the needle-bar d and needle, as usual. On the end of this shaft e is a disk or crank, f, carrying a pin that works in a slot (shown by dotted lines in Fig. 2) in the back of a vibrating lever, g, that is attached by and moves on a pin, 1, attached to the bed. In this lever g is a hole through which the pin h of the shuttle-driver passes, and i is the nger coming up behind the shuttle to drive the same.

k is a spring tending to keep the pint' down onto the raceway Z, in which the shuttle travels. By reference to Figs. 2 and 8 the operation of this shuttle-driver will be understood, as follewszJThe lever g is vibrated by the pin of the disk f, traveling in the slot of said lever, and the spring k is compressed as the shuttledriver h is drawn out of said lever g. rlhis operation checks the momentum of the shuttlc-driver and lever as the crank-pin passes the center, and said spring 7c accelerates o1 aids in starting and propelling the shuttle. Thus the movement is more uniform, noiseless, and reliable, because that thumping and wear consequent upon suddenly arresting and reversing the motion of the shuttle-driver is avoided, and none of the parts are liable to wear loose and effect any variation in the rela-V tive movements of the needle and shuttle.

m is a feeding-wheel attached to the bed by a center pin, 2, that can be adjusted vertically to regulate the amount said feed-wheel projects from the bed, and n is a spring pressed onto the flat side of said feedwheel m to hold the same steady on the back movement of the feeding mechanism, next described. 0n the side of the wheel m is a hub or diverging ring, as seen in Fig. 3, over which a circular clamp, p, sets. This is provided with two binding-blocks, 3 and 4, and the pawl o,.that is attached by the screw 5 and kept to the hub a? by the spring 6.

7 is a spring tending to keep the lever p of the clamp p toward a toe, q, on the short rockshaft r, on which is a lever, s, that is operated on by-a cam, t, on the main shaft e.

The operation of this feeding device is as follows: Vhen the toe q presses on the lever p', the pawl o clamps and binds against the flaring or diverging ring x, which draws the blocks 3 and 4 down onto the said ring, the divergence of which causes the faces of said blocks to press against tai-e face of the feedwheel m, producing a binding friction almost to the periphery of Said feed-wheel, insuring that the feed-wheel will be turned the given distance; but so soon as the pressure of the toe g is released, the spring 7 draws back the lever p', the movement of which releases the pawl o in consequence ofits slightly-inclined position, and the parts are relieved and turn freely O11 the feed-wheel, around the hub x, the distance regulated for the stitch, which regulation is effected by the incline 8 and adjusting-screw u. The spring u prevents the feed-wheel turning back by any slight friction, and the spring 9 lifts the toe when not acted on by the cam t.

The spool of thread for the needle (shown at ru in Figs. l and 4)is mounted on a spindle, 10, and clamped thereto by nuts l1; and this spindle is sustained on points in a frame, w.

One of these points is tted to slide in a cavity and kept up by a spring 12. The other point is adjusted by the set-screw and nuts 18. The spring 12 s sufficient for resisting the screw 13 in regulating the tension; but When one spool is to be taken outvand another substituted, it ean be effected Without changing the tension, because the spring` 12 and point can be coinpressed suffioiently to allow the other end of the spindle to clear the point 13.

Having` thus described my said invention7 what I claim7 and desire to secure by Letters Patent, is-

JAMES s. MCGURDY.

Vitne-s'sehsz-u I LEMUEL W. SERRELL, THos. Gno. HAROLD.

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