US168989A - Improvement in sewing-machines - Google Patents

Description

G.- HANCOCK.

Sewing-Machine.

Patented Oct. 19, 1875.

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WITNESSES.

INrrED STATES PATENT; QEFICE.

GEORGE HANCOCK, OE PROVIDENCE, RHODE ISLAND.

y IMPROVEMENT IN siwnvc-iviAci-imits.i' i ,I

Specification forming part of Letters Patent No. 168.989, dated October 19, 1875; application filed June l0, 1874.

To all whom t may concern:

Be it known that I, GEORGE' HANCOCK, of the city and county of' Providence and State of Rhode Island, have invented a new and useful Im provement in SewingMachines, of' which the following is a specification, ref'erring to the accompanying drawing making part of the same, in which- Figure l is an'elevation and section of' the frame of a sewing-machine, showing the mechanism which constitutes my said improvement. Fig. 2 is a rear elevation of the said mechanism separately. Fig. 3 is an elevation and cross-section of the parts at the lower end of Fig. 2. Fig. 4 is a plan and view ofthe under side of the table in Fig. 1.

Similar letters mark like parts in all the figures.

My said invention relates to improved mechanism for operating the shuttle ofLsewing-machines from the same shaft which operates the needle, the object being to render the operation of' the same noiseless, and capable of' simple and cheap reparation from the effects of wear; and my invention, for this purpose, consists of a combination of an eccentric and strap on the driving-shaft, and a sliding' connection between f the same and a vertical lever, and a universal joint or connection between the actuating end of the said lever and another horizontal lever that operates the shuttle beneath the table of the machine, sov that the rapid changes of inotion may be made without noise and without excessive wear of the parts, and with provision for repairing wear of the parts at small expense.

Figure l of the drawing shows the improved mechanism arranged with a vertical section of the sewing-machine table T and upright B and arm A, in which the shaft S has bearings and operates the needle-bar at the front of the ma chine in the usual way. An eccentric, X, is secured on said shaf't with a surrounding strap, V, extending from a block, D, beneath, in which are secured two rods, el and c. These rods extend into sockets provided to receive them, so they can slide therein in the upper part of' the vertical lever R, which is pivoted at E in the upright B of' the machineframe. The said rods thus form a sliding connection adapted to convert the rotary movement of i.` .der

the said eccentric into the vibratory move- 'ment ofthe vertical lever positively, and the free end G of the said lever is formed with a pivot, L, which forms part of a universal joint or connection with the contiguous end of the horizontal lever H, which is pivoted at C to the under side of the table, and drives the shuttle at the opposite end K. The said universal joint, beside the pivot L, comprises a clasping-socket, N, with a V-shaped bearing, which grasps the pivot L, as shown in Fig. 3, and is adjustable therewith by means ofthe setscrew I. rlhis socket has also a pivot, n, which extends into a sleeve, m, forming the end of the horizontal lever H, which sleeve is split and has a screw-nut, h, on the outside to com press the pivot n in its sleeve, for the purpose of taking up any lost motion at this point.

By the construction and arrangement ofthe several parts as described the rotary movement of the eccentric X on the main shaft is transmitted freely and positively to the upright lever R by means ofthe said sliding connection, and the vibratory movement thereby produced is transmitted to the horizontal shuttle-lever H through the universal connection at the junction` of the two levers, as described, by means of' which all loss of movement is provided f'or beforehand, and, besides, means are provided to take up the parts and prevent loss of movement that is produced by after use and wearing of said parts.

The two rods cla-nd e are secured in the block D of the eccentric strap by set-screws J, Fig. l, and said rods are simply lengths of' round steel wire, which, when completely worn, can be replaced by new ones at a very slight expense; and before such replacement becomes necessaryY the rods may be turned in the sockets when they have become worn, and a fresh surface presented to sustain the wear.

It will also he seen that, from the construction and arrangement of the said sliding connection, the rapid reciprocating movement of the parts is rendered entirely noiseless, even when perceptibly worn.

As shown and described, two rods, d and e, form the sliding connection; but I have found in practice one only to be enough for the purpose, and I contemplate this simplification of the mechanism. Besides this, the universal joint is susceptible lof othermforins; of construction, with the, saine eifecti and, purpose, so that the one setforth and herein shown is not meant to be the exceptional construction to which I am exclusively conned.

Having described my invention, I claimi In a Sewilflemachine;1 thiefnmbuatimwmdi 1 arrangement of the universal joint, consisting of the pivot L, clasping-socket N, havingwayf shaped bearing which gra-sps the said pivot", and adjustable thereto through the medium of theMset-screw I, pivot/n adaptedto be adjusted iriithe sleeve m on ithe end ofthe horizontal lever H; said'sleeve m being split and provided with a nut, h, the several parts being constructed Land arran ged to operate in connection with each other, substantially in the manner as and i fortheipurpose speci tied. l

GEORGE HANCOCK. Witnesses ISAAC A. BROWNELL, DAVID HEA'roN.

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