USRE1592E - Improvement in sewing-machines - Google Patents

Description

- A. H. HOOK. Sewing Machine.

No, 1.592. Reissued Dec. 15., 18631 rt PETERS. min-MW Numbtom ac.

UNITED STATES PATENT OFFICE.

WILLIAM 'STANLEY, OF NEW YORK, N. Y., ASSIGNEE, BY MESNE ASSIGN- I ME NTS, OF ALBERT H. HOOK, OF SAME PLACE.

IMPROVEMENT lN SEWING-MACHINES.

Specification forming part of Letters Patent No. 22,179, dated NOVEll'lliGl' 30, 1858; Reissue No. 1,592, dated December 15, 1863.

Z0 all whom it may concern:

Be it known that ALBERT H. HOOK, of the city and State of New York, was the inventor of certain new and useful Improvements in Sewii'ig-Machines; andI do hereby declare that the following is a full, clear, and exact description thereof and of the construction and .operation of the same, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon, and making a part of this specification.

Figure l is a sectional side elevation of the machine. Fig. 2 is a portion of the arm that holds down the cloth. Fig. 3'is a front view.

ing-machine, dispensing with threading, and

overcoming other ditficulties in its operation usually incident to such machines, andin the production of a new and improved thread-tension for regulating the tightness of the stitch.

The construction of the machin'eis as fol lows: A casting is made, consisting of a bedplate, a, and having a part, b, projecting frorn its under side and extended so as to form a holdfast, by which it can be attached to a table or any suitable support by the set-screws c c tomake it firm and steady. Above the table acurvetl arm, (1, permanently fixed at the rearor back part of the table,curves over to the front, as is usual in many sewing-machines. This arm is hollow, for the purpose hereinafter described. A m ain shaft, 6, passes through the projection 11, having on its outer end a small fly-Wheel with a crank,e, by which motion is given to the machine. Motion can, however, be given by a belt, or in any convenient way. On the opposite end of such shaft 0 is a wheehf, (or an arm may be substituted,)

-. on which is a wrist-pin, h, by which the needlebar is moved up and down. The needle-bar is a flat oblong plate, 9, which slides up and down in a vertical position, or atright angles to the the top of the needle-barg, and runs up through an opening in the plate a, made for it, and so pierces the cloth in the act of sewing,'-as here; inafter described.

Directly behind the wheel f, on the end of the shaft 4", is a cam,p, the form ofwhich is represented/by dotted lines inFig. 4, which actuates the feed motion, as follows: A'n arm, k,is attached to the permanent projection b by a screw, 1, that forms its pivot. To the upper end of this arm a bent lever or bell-crank piece, m, is pivoted at its angle, the horizontal an 111 of which has an upward projection at its upper end, that'projects through a slot cut in the plate a and enters the cloth when feeding. Its op posite arm projects downward, and is struck and forced forward by the upper end ofa lever, n, which is pivoted by its center to the projection I), and is moved by its lower end coming in contact with the cam 12. A spring, 0, bears against the arm 7c, and causes the parts to recedp against the action of the cam, and the projection on the lever W to leave the cloth.

The action is as follows: The cam 11 throws outward the lower end of the lever 'n, which causes its upper end to move in an opposite direction, forcing forward the bent lever m, and thus raising the projecting points on its upper end, so as to push it into the cloth to be 'fed and carry that forward. The cloth is held down by a sliding piece, q, affixed to the arm d. This piece q is forced down and held upon the cloth by the set-screw r, and against it the projection on the upper end of the bent lever m strikes and prevents that from rising'any higher. When the set-screw r releases the slidepiece (1 a spring, 8, throws it up out of the way, as shown in Fig. 4, and releases the cloth. Fig. 3 represents this piece held down upon the cloth.

Within the hollow arm (I a lever, t, plays,

having its fulcrum at u, Fig. 1, the lower arm of which extends down to a face-cam, n, on the shaft 6. The upper end of this lever has a connecting-rod, t, Fig. 2, which connects it with a vibrating finger, w, or thread-guide, which is pivoted at its upper end to the head of the bent arm d, the rod tbeing connected vwith such thread-guide just below the point where it is so pivoted. In the lower end of this threadguide is an eye, through which the thread from the spool passes after passing through a permanent eye, at, fixed to the arm (I.

The tension of the thread is regulated by the a use of two plates, 2 a, (one of which is shown in enlarged size in Fig. 5,) which are placed together, as shown in Fig. 3, fitting loosely upon a center pin, 1, and held or pressed together to any-degree desired or found necessary by means of a spring, 2, the pressure of which is controlled by a set-nut, y. These plates or washers z z are made concave at their centers, and are rounded ott' at their outer edges, and have a center perforation to pass onto the center pin, 1. The thread in coming from the spool is passed between these plates or washers, is then given a turn around thecenter pin, and afterward passes out from between such washers on its way to the eyes a: w and the needle. By making these plates concave at their centers the thread is left free to travel around the center pin, and is prevented from riding or being in any way impeded as it passes around such center pin, and the rounding ot' the outer edges'oi' these plates also facilitates the entrance and exit of the thread between such plates.

Any other suitable means than the spring 2 may be used to give the required pressure to the plates or washers z z, and any degree of pressure can be easily giveifthem.

The plates or washers z a may be made of steel, or any material which will permit the thread to pass between their surfaces, substantially as set forth.

The operation of the machine is as follows: Then the cloth is in place, and the slide-piece q is presseddown upon it, and the thread prop erly passed through the tension and guides,

the needle is thrust upward through the cloth, as shown in Figs. 1, 2, 3. The thread-guide 11 'U, which is in the position shown by the red lines in Fig- 2 while the needle ascends, is then brought into the position shown in Figs. 1,2 and the thread brought close around the needle. When this descends the barb catches and carries down a loop of the thread through the cloth, which is then fed forward a stitch, when the needle again ascends, leaving the loop on it,and by .the same process again catches the thread and draws down another loop through the first, and this is repeated as the sewing proceeds.

Vthat is claimed as new, and is desired to be secured by Letters Patent, is-

'1. The combination of the levers m a, arm k, spring 0, and cam 17, constructed and arranged substantially as and for the purpose set forth.

2. The combination of the two washers or plates 2 z, concave at the center and rounded at their outer edges, with a center pin and any suitablemeans to give such plates pressure, substantially as and for the purposes set forth. WILLIAM STA NLEY. \Vitnesses:

ALQNZO G. FARNI-IAM, S. D. LAW.

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