US644801A - Stop-motion for sewing-machines. - Google Patents

Description

No. 644,801. Patenten; Mar. s, |900;

J. T. nosAN.

STOP MUTIUN FUR SEWING MACHINES.

(Applicaltion led .Tune 30, 1899.)

lllllllln@ (No Model.)

lUNrTED STATES PATENT EEIC-E.

JAMESA T. HOGAN, OE JEEsEY CITY, NEw JERSEY, AssIGNoR To TIIE NATIONAL MACHINE COMPANY, OE NEW YORK.

STOP-MOTION FOR SEWING-MACHINES.;

SPECIFICATION forming part of Letters Patent No; 644,801, dated Maren e, Ieob.

.V ,r y Original application filed February 20, 1899, Serial No. 708.801. Divided and this application tiled June 30, 1899. Serial No. 722,398. (No model.)

To all whom t may concern:

Be it known that I, JAMES T. HOGAN, a citizen of the United States of America, residing in Jersey City, county of Hudson, and State of New Jersey, have invented a certain new and useful Improvement in Stop-Motions for Sewing-Machines, of which thel following is a specification.

My invention relates to a stop-motion comprising a brake and belt-shipping mechanism more particularly designed for use on sewing machines, the present application being a division of an application, Serial No. 708,301, iiled by me February 20, 1899.

I will describe my improvement `,and then point out the novel features in Claims.

In the accompanying drawings, in which similar letters of reference indicate similar parts, Figure l is a side elevation of my improvement applied to a buttonhole-machine, only sulicient of the latter being shown as is necessary to illustrate the invention. Fig. 2 is an end elevation of the same, and Fig. 3 is an inverted plan of a slide-rod and toggle device comprised in the improvement.

A designates the bedplate,and A the head, of a sewing-machine of any suitable form.

B designates the main driving-shaft, rotatably mounted in the head of the machine inv the Well-known manner. Bis a loose pulley, and B2 a fast pulley, on said shaft.

B2 is the driving-belt. Forming part of the pulley B2 or otherwise rigidly secured to the main drivingshaft is a disk or plate C, having on its face a projecting piece C', made, preferably, with a beveled or cam surface, as shown. This piece O is so placed on the disk C that it will Contact with a suitable frictionbrake so as to stop the rotation of the ymain driving-shaft at or about the time when the needle is at its highest point, thus relieving the operator of the necessity of turning the shaft to release the work.

D designates a rod located below the bedplate of the machine and supported so as to slide freely in suitable brackets or. a a2, secured to orforming a part of said plate. To the end D of said rod are attached levers E and E by means of screw-studs c2 and e2.

The said levers are respectively fulcrumed on studs e4 and c5, secured to a bracket A2, favstened by suitable means,as screws or bolts a4, to the head or base of the machine. The ends e and e of levers E and Ef, respectively, are slotted, as shown, to permit the adjustment of said levers on the end D of rod D. The bolt of screw-stud e2 is set eccentrically on the body to permit of the-adjustment of lever E to compensate for the wear of the face of brake-shoe F, such form of stud being well known. To the upper end of lever E, I secure a brake-shoe F, having preferably a iiat face f, of leather or other suitable material. To the upper end of lever E', Isecure an arm E2, having a fork F.3to engage the belt B3.

The parts above described are normally held in the position shown in the drawings by means of a spring G, supported on the rod D between the bracket a and an adjustable collar g on said rodthat is, the spring G tends to move the rod D inward or to the left, and thus holds the brake-shoe F in contact with the projection C of the disk C and the belt B3 on the loose pulley B. p

H designates a toggle mechanism, the arm 7L of which is pivoted on a stud h2 of a collar D2, rigidly secured by a screw d to the rod D. The other arm h is pivoted on a stud 7b3 of a bracket H3, secured by a bolt h4 tothe bracket a3. To the hook H', secured to the ends of the stud H2, which unites the inner ends of arms 7L and 71.', is attached a strap orcord under the control of the operator. A screw J passes through the arm h and bears against the rod D, and by adjusting said screw the throw of the toggle may be varied.

The operation of my improvement is as follows: In starting the machine the operator pulls on the strap attached to the hook 1I and holds or secures the same. This opens the toggle-levers, moves the rod D, outward and thus releases the brake-shoe F from Contact Y with the surface of the projection G, and ships the belt B3 from the loose to the fast pulley. When the operator has completed his work, the treadle-strap is released. This permits the spring Gto move the rod D to the left, thus shipping the belt to the loose pulley B and bringing the shoe F into such position that rotation of the main drivingshaft is stopped when said shoe frictionally engages the projection C. By beveling the faces of the projection C the stoppage of the shaft B is effected gradually and no strain is put upon the parts of the mechanism, although a fiat face is Within my invention. The toggle mechanism H plays an important function in this connection, as after it is closed in the position shown it aids the spring G to prevent the movement of the rodD outwardly and holds the lever E with its shoe F positivelyin position. To draw the toggle-levers h and h up quite horizontal7 I attach a spring K to the bed-plate and to one of the said 1evers, as h', so that with the levers in such position the pressure on the brake-shoe Fv will not rock them open.

What I claim, and desire to secure by Letters Patent, is-a l. In a sewing-machine the combination of a rod movably supported in suitable brackets, a lever provided with a brake-shoe and actuated by said rod, a main driving-shaft, a cam-surface on said shaft, a spring to normally hold the brake-shoe in contact with said cam, and a toggle-lever connected to said rod, substantially as described.

2. In asewing-machine the combination of a rod movably supported in suitable brackets, a lever provided with a brake-shoe and actuated bysaid rod, a main driving-shaft, a cam-surface on said shaft, a spring to normally hold the brake-shoe in contact with said cam, a toggle-lever connected to said rod, and means to limit the throw of said toggle-lever, substantially as described.

3. In a sewing-machine the combination of a main driving-shaft having fast and loose pulleys, and also a camsuri'ace thereon, a rod and means to actuate the same, a brakelever adapted to engage said surface, and a belt-shipping lever, both of said levers connected to and actuated simultaneously by said rod, substantially as described.

4. In a sewing-machine the combination of a main driving-shaft having fast and loose pulleys and also a cam-surface thereon, a rod movably supported in suitable brackets, a brake-lever and a belt-shipping lever both of which are secured to said rod, a spring to normally hold the brake-lever in engagement wit-l1 said camsurface and the belt on the loose pulley, and a toggle-lever connected to said rod, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

JAMES T. HOGAN.

Witnesses:

H. COUTANT, CHARLES S. JONES.

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