US154385A

US154385A - Improvement in sewing-machines

Info

Publication number: US154385A
Authority: US
Publication date: 1874-08-25
Anticipated expiration: 1891-08-25

Description

G. FRAME. Sewing-Machines.

. NO'I543'85.. Patented Aug.25,r1`874.

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GIBBONS FRAME, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO OSCAR PATENT OEEIcE.

F. DAVIS, OF'SAME PLACE.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 154,385, dated August 25, 1874; application filed April 8, 1874.

To all whom it may concern Be it known that I, GIBBoNs FRAME, of the city and county of Philadelphia and State of Pennsylvania, have invented a new and useful Improvement in Sewing-Machines; and I do hereby declarethe following to be a clear and exact description of the nature thereof, sufficient to enable others skilled in the art to which my invention appertains to fully understand, make, and use the same, reference being had to the accompanying drawings making part of this specification, in which- Figures l and 3 are side views of the device embodying my invention. Figs. 2 and 5 are end views thereof," and Fig. 4 is a central longitudinal section thereof.

Similar letters of reference indicate corresponding parts in the several figures.

lt is well known that the cam or eccentric that imparts motion to the feed-bar of a sewing-machine of a certain class is formed solid with the driving-shaft, and that when said cam is Worn the entire shaft is no longer serviceable. In order to withdraw said shaft the machine must irst be removed from the table.

The loss of the shaft and difficulty of its ren moval are serious. matters, which my invention is to remedy, the same consisting of a cam having a stem which enters a longitudinal opening in the shaft, the construction, operation, and advantages of which will be here inafter stated.

Referring to the drawings,A represents the shaft of the sewing 1nachine, and B the cam or eccentric whichiimparts motion to the feedl bar in the manner well known. The cam B is detached from the shaft, and has formed with it a stem, C, which is adapted to enter an openin g formed longitudinally in the shaft A. D represents a set-screw,whicl1 passes through the" shaft A, and bears against the stem ofthe cam for holding the latter in position. The looper or looper-hook is fitted into a longitudinal opening in the cam B, and a set-screw will be provided for holding the looper in place.

It is evident that as the cam, during usage, is in contact with the adjacent portions of the feed-bar, the former is continually subjected to wear; therefore the feed-bar is not properly operated, and the uniformity of stitch is impaired. broken off, and in either case the shaft has to be removed.

By the use of my invention, the shaft need not be disturbed, for the old cam will be replaced by a new cam, and the shaft continues to render service as previously.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

Y The feed-operating cam B, formed with stem C, and with the opening for the shank of the hook, when combined with the shaft A, having a longitudinal opening for the stem, all constructed, arranged, and operating substantially as and for the purpose set forth.

GIBBONS FRAME.

'Witnessesz 0. F. DAVIS,

JOHN A. WIEDEEsHEIM.

In some cases the cam is fractured or