US375184A - Brake for sewing-machine motors - Google Patents

Description

- Model.) 2 Sheets-Sheet 1.

W. NAAB.

BRAKE FOR SEWING MACHINE MOTORS. No. 375,184.

Patented Dec. 20,1887.

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WITNESSES? INVENTOR ATTORNEY- N. PUFFS. PhnloLHhogmphcr. Waslllliglmv u c.

(No Model.) 2 Sheets-Sheet 2. W. NAAB BRAKE FOR SEWING MACHINE MOTORS.

No. 375,184. Patented Dec. 20, 1887 WITNESSES: x INVENTOR r M web/W ATTORNEY.

UNITED STATES PATENT OFFICE- WILLIAM NAA B, OF IVHITTEMORE, MICHIGAN.

BRAKE FOR SEWING-MACHINE MOTORS..

SPECIFICATION forming part of Letters Patent No. 375,184, dated December 20, 1887.

Application filed June 7, 1887. Serial No. 240,547. (No model.)

To aZZ whom it may concern.-

Be it known that I, VVILLTAM NAAB, of Whittemore, in the county of Iosco and State of Michigan,haveinvented new and useful Improvements in Brakes for Sewing-Machine Motors; and I do herebydeelare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings,which form apart of this specification.

This invention relates to newand useful improvements in brakes for sewing-machine motors; and the invention consists in the peculiar construction and arrangementof parts, whereby the device forms an independent motor under the control of the operator, all as more fully hereinafter set forth.

Figure I is a front elevation of a sewingmachine to which my device is attached. Fig. 2 is a vertical cross-section showing the motive spring and train of gear by means of which the power is conveyed to the operating-shaft of the sewing-machine. Fig. 3 is an enlarged elevation of the parts on the winding-shaft of the motor. Fig. 4 is a detached view of the brake. Fig. 5 is a side elevation of the main wheel.

In the accompanying drawings, which form a part of this specification, A represents the ordinary going-barrel, as in spring-clocks, to which the spring B is secured in the ordinary manner, and which communicates its motive power by means of a ratchetwheel, 0, and dogs D to a suitable train of gearing interme diate between it and the operating-shaft G of a scwing-machine,said train of gearing and go ing-barrel being suitably supported byaframe placed within the vertical portion D of the head of a sewing-machine in such a manner as to leave the winding-shaft E projectbelow the table, and accessible for winding by means of a suitable crank, F.

Upon the shaft of the going-barrel is secured a friction-drum',G, around which passes a friction-strap, H, the free ends of which are secured to a lever, I. This lever is pivotally secured at a to the under side of the sewingmachine table, and upon the free end of said lever is adjustably secured the weight J by means of the setscrew j, all so arranged that the free action of the gravity of the weight tightens the friction strap on the friction-drum sufficiently to stop the motor against the action of its spring.

K is a knee-lever pivotally secured at 0 to a hanger, d, secured to the under side of the sewing-machine table,and this kneelever extends horizontally, or nearly so, from its pivotal point directly underneath thelever I inprox imity to the standard of the sewingmachine, and then, forming a downward bend, extends vertically below to within the height of the knee of the operatorgwhere it terminates in an adjustable kneepad, L, all so arranged that by a lateral motion of the knee the operator can bring sufficient pressure to bear against the knee-pad to oscillate the knee-lever, and thereby relieve the friction brake to any desired degree to release the motor, while normally the friction-brake keeps the motor at rest. This knee-padis adjustable on the lever I means of the slot Z in the lever and the setscrew n, passed through a lug, m, on the pad,as shown in Fig. 1.

The spring 0, bearing against the free end of the knee-lever, keeps the latter from parting contact with the brake-lever.

It will-be seen'that by means of this construction the operator has the great advantage of purchase in operating the brake by a slight exertion with the knee,andin a position which neither becomes tiresome by requiring an unusual position, as the knee pad rather forms a point of rest for the knee of the operator than otherwise while the machine is running. It will further be seen that the motor is entirely concealed and can in no way interfere with the work or with the wearing-apparel of the operator.

Vhat I claim as my invention is- 1. The combination, with a springmotor partially concealed within the head of the sewing-machine, of afriction-brake operated by a weighted brake-lever secured underneath the sewing-machine table and arranged to normally stop the motor, and a knee-lever to operate the brake-lever, all arranged to operate substantially as described.

2. The combination of a friction drum secured to the shaft of the going-barrel,a brakestrap, a weighted brake-lever, and a knee-lever extending horizontally and then vertically in proximity to one of the standards of the 4. The combination of the motor-spring B sewing-machine, and an adjustable knee-pad and train of gear, the friction drum G, fricsecured to said knee-lever, substantially as tion-strap H, weighted brake lever I, and described. knee-lever K, all arranged and operating sub- 15 3. The combination,with the weighted brakestantially as described. lever I, of the knee lever K, extending horizontally underneath the brake lever and then \VILLIAM NA AB. vertically downward in proximity with one of the side frames of the sewing-machine, and an \Vitnesses: 1o adjustable knee-pad, L, all arranged and op- O. A. WAKEMAN,

erating substantially in the manner described. A. H. VVILTsIE.

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