US37202A - Improvement in sewing-machines - Google Patents

Description

A. B. SHAW.

f Sewing Machine.

No. 37,202. Patented Dec.v 16.- 1862.

figg;

UNITED STATES PATENT OFFICE.

A. B. SHAV, OF TORO/ESTER, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND N. H. SHAW, OF SAME PLAGE.

IMPROVEMENT IN SEWING-MACHINES.

Specilcation forming part of Letters Patent No. 37,202, dated December 16, 1862.

To all whom z't may concern:

Be itknown that I, A. B. SHAW, of the city of Worcester, in the county ot' Worcester and State of Massschusetts, have invented certain nen1 and useful Improvements in Sewing-Machines; and l do herebydeclare that the following is a full, clear, and exact description ot' the same, reference being had to the accompanying drawings, forming part of this specication, in which- Figure l is a front view of a machine with my improvements. Fig. 2 is a vertical section at right angles to Fig. 1, exhibiting the mechanism for holding down and feeding the cloth or other material to be sewed. Fig.3 is a top view ot' the looper and its operating mechanism. Fig. 4 is a side view corresponding with Fig. 1. Fig. 5 isa View similar to Fig. l, but showing the parts in a different position. Fig. 6 is a side view of the looper.

Similar letters of reference indicate correspondingparts in the several figures.

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

A is the stand or fratrie ot' the machine, and B the work-bed, bolted to the lower part ot'the stand A.

C is the driving-wheel, arranged to rotate upon a ixed stud, a, at the opposite end of the machine to where the needle is situated, and carrying a spur-gear, D, which gears with a spur-gear, E', on the needle-operating and feed-operating shaft E, and with a spur-gear, F', on the looper-operating shaft F,the said shafts being arranged parallel with each other, the latter in bearings under the work-plate and at the back of the machine and the former in bearings in the upper part of the framing. The shaft E carries a crank or eccentric wrist, b, for operating the needle-bar G, a cam, C, for operating the feed-lever H, and a cam, d, for taking the pressure ott' the feeding and pressing foot pieces. The shaft F carries a crank or eccentric wrist, e, for producing the operation of the looper I. l

The looper l is attached to or made in the same piece with an arm, i, at the bottom of which is formed a pivot, f, which is received in a bearing in a stud, g, which is firmly secured in a slotted rocker, J, which rocks on a xed horizontal pin, h, securedoin the lower part ot' that end of the stand VA next the needle. The said looper has two movementsviz., a longitudinal one, produced by the move ment of the rocker J, above mentioned, and a lateral one, produced by the vibration of-the arm t' from the pivotf.

The' above-mentioned lateral vibration ot the arm t' is produced by its being carried, in its movement with the rocker, back and forth through the curved slot 7c, provided in a stationary plate K, (shown best in Fig. 3,).

secured lto the stand A. The vibrating movement ot' the rocker J is produced h'vthe revolution of the crank or eccentric-wrist pin e, before mentioned, in the slotj, provided in the said rocker for its reception, the slot being so formed and the wrist e so arranged as to propelly time the movements ot' the looper relatively to those of the needle, as will be presentl y described.

To prevent any strain ot` the pivotf or stud gbeing produced in the working of the looper, two steady-vpins, in m, are provided in the rocker J for the arm 4i to work between. The looper is curved vertically in a t'orm approximating to that of an arc concentric with the axis ot' the pin h. It also has a short lateral curvature, as shown atp in Fig. 3, the hollow side being toward the needle, and has an eye, n, in front ot` and an eye, o, behind the saidV curvature, and a groove between these eyes on the side farthest from the needle.

rEhe operation of the looper relatively to the needle q in making the stitch is produced as follows: When the needle has descended through the cloth to its lowest position the looper is in the position shown in Fig. 5. As the needle rises the looper advances, the arm i working in thestraight part ot' the slot and the looper passing between the needle and its thread and retaining upon itself a loop of the needle-thread. Just as the curve p ot' the looper arrives at the needle the arm i'. arrives at a bend in the slot 7c, and the looper, in its continued advance, is caused by the form ot' the said slot to receive a lateral movement toward the path of the needle, the point of which has now risen above it, and as the needle descends again through the clothl it is caused to pass within the curvep of thelooper,

between the latter and the portion ofthe loekl y, is provided in the lower leaf of the spring in g-thread, which is extended straight across the said curve fromthe eye n. As the looper retires it moves laterally in the opposite direction to that above mentioned, and its point is thereby drawn out ofthe way of the needle. The lateral movement and lateral curvature of the looper combine to insure the passage of the needle into the loops ofthe looper-thread.v

The feed-lever H, carrying the jointed feeding and pressing foot L, is fitted into a vertical slot, r 1, in the stand A, the part received in the said slot having rounded protuherances s s on each side to bear against the sides ot' the said slot in such a manner as to permit the free vibration of thelever, as well as a free upward and downward movement thereof'. The said lever is made with a yoke, H', for the reception of the cam c, and fitted with a setserew, t, to regulate the feed, as in manyother sewing-machines. The downward pressure upon `the said lever is-produced by a spring, a o, made in two leaves, of which the upper leaf, u, is secured firmly to the top ofthe stand, and the lower leaf', o, is attached to the upper one, u, by a rivet, w, or other means, in such a manner as to permit it to have an independent upward and downward movement. The upper leaf, a, does not touch the lever H, but the endvof the lower one, o, enters a transverse notch in the said lever.

Between the spring and the cam d there is arranged a pin, which is fitted to slide vertically in a guidein the standard A, and a hole,

for the said pin to pass freely through. Thile the needle is in the cloth and the lever is returning with the foot L, preparatory to a new feed-movement, the cam, by its action through the pin .ron the upper leaf ofthe spring, raises the said leaf, and so removes the pressure of the spring from the lever and foot, allowing the latter to slide freely over the cloth, the

lower leaf ofthe spring then hanging loose below the upper one; but before the needle is drawn out of the cloth the cam passes round far enough to let the upper leaf of the spring descend, and the two leaves ot' the spring then combine to press upon thelever and foot, and continue to do so until the needle has again entered the cloth, when the cam again raises the upper leaf.

I do not claim broadly giving the looper a lateral as well as a longitudinal movement; nor do I claim broadly taking the pressure oli' the foot or pressure pad of a sewing-machine while the needle is-in the cloth; but

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

The combination ot' the lifting-cam and pin .r with the lever Hand springs at, in theman-v uer and for the purpose herein shown and described. t

A. B. SHAW.

Witnesses HERBERT A. SHAW, NA'LHL. M. SHAW.

Images