US280409A - Sewing-machine - Google Patents

Description

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SEWING MACHINE.

No. 280,409. Patented July 3, 1883.

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' UNITED STATES PATEN T EEICE.

. MILO P. SMITH, or NoEwALK, OHIO.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 280,4(39, dated July 3, 1883.

' Application filed March 20, 1893. (NnmollcL) To aZZ whom it may concern.-

Be it known that I, MILO P. SMITH, of Norwalk, in the county of Huron and State of Ohio, have invented certain new and useful Improvements in SewingMachines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in sewing-machines, the object of the same being to provide simple, durable, and efficient feedoperating mechanism, and improved means for changing the length of stitch; and with these ends in view my invention consists in the parts and combinations of parts, as wi1lbe. more fully described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in side elevation and partly in section of my improved machine. Fig. 2 is a bottom plan view of the same. Fig. 8 is an end view. Fig. 4 shows detached views of the shuttlelever and feed-operating lever, and Fig. 5 an elevation of one of the operatingeams.

A represents a bed-plate provided with the upwardlyextending hollow arm B, through the upper end of which latter-the drive-shaft 0 passes. This shaft 0 is driven in the ordinary manner, and is provided near its rear end, inside of the arm B, with the two cams D D, which latter operate, respectively, the vibrating levers E E. These levers are pivotally secured within the arm B to the shaft F,

and are bifurcated or forked at their upper ends to partly embrace the cams D D on the driving-shaft 0, through which motion is imparted thereto. The lever E is situated in front of the lever E, and the lower end thereof is provided with a circular head, a, which latter rests in the bifurcated rear end of the shuttle-lever H, and operates the same in the ordinary manner. This shuttle-lever is pivotally secured to the lower face of the base-plate, and is provided at its front end with ashuttlecarrier, b, within which the removable shuttle is located. The shuttle-lever is pivoted to one side of its center, near its rear bifurcated end, and is provided at one side, immediately opposite its pivotal point or axis, with the laterallyprojeeting arm I, which latter is preferably cast in the same piece with the shuttle-lever.

The outer end of the arm I is connected to the link J through the intervention of the pivotpin 6, while the rear end of the said link is pivotally secured to the upper face of the op eratinglever K. From the foregoing it will be seen that when the shuttle-lever is operated the i'eedoperating lever K is also moved backward and forward simultaneously with the movement of the said shuttle-lever, thereby imparting to it two movements, while the mechanism hereinafter to be described gives it the necessary lateral movements.

L is a sliding bar adapted to be moved in the guidesf. This bar is provided on its lower face, at its front end, with an inwardlyprojecting finger, the end of which latter is adapted to receive and support the pivotal. bearingblock M, while the front end of the said bar is provided with an upwardly-projecting screw, N, having a female screw-threaded cap, 0, by means of which the bar is held in position. The bearing-block M is grooved on its upper face for the passage of the feed-operating lever, and forms a pivot for the said lever. By moving the sliding bar L backward the bearingblock M is also moved in the same direction, which brings the fulcrum of the lever K nearer the center, thereby increasing the lateral play of the forward end of the said lever, and consequently increasing the length of the stitch. When it is desired to shorten the stitch, the sliding bar is moved forward, so as to bring the fulcrum of this feed-operating lever K nearer its outer end, which limits the lateral play of the front end of the said lever, thereby shortening the stitch. The front end of the feed-operating lever K is provided with, an inclined upper face, and passes through an open slot in the spring-actuated feed-bar P, and imparts thereto lateral movement in both directions and an upward movement while thesaid feed-bar is feeding the fabric forward, while the rear curved end of the said lever terminates in a horizontal finger, i, which lat ter passes through and moves in. a circular bearing formed in the lower end of the vibrating lever E. This finger is free to be moved longitudinallythrough the bearing in the lower end of the lever E as the feed-operating lever is moved forward and backward by the shuttlelever K.

Motion is imparted to the drive-shaft in the ordinary manner, which in turn vibrates the levers E and E sinuiltaneouslyin opposite directions. The lever E, being connected by a sliding joint to the feed-operating lever, imparts to the said lever the necessary lateral motions, while the shuttle-lever, which is also connected therewith by a link, gives it the necessary longitudinal movements.

The cam D on the shaft 0 is so shaped and secured relatively to the said shaft as to vibrate the lever E from right to left with a short stoppage between each movement, while the cam D is circular and secured eccentrically to the shaft, and consequently moves the shuttle-lever from right. to left without intermission. Thus it will be seen that when the cam D on the driving shaft has moved the lower end of the vibrating lever E in one direction the latter, through the intervention of the teed-operating lever, moves the feed-bar backward. The vibrating lever thus remains stationary for a short interval, during which time the shuttle-lever moves the feed-operating lever forward. After the last movement the lower end of the vibrating lever is moved in the opposite direction and again comes to rest, and the shuttlelever draws the feed-operating lever backward, during which movement the teeth of the feeder-bar are brought up flush with the upper surface of the baseplate by means of the inclined or wedge-shaped face of the feed-operating lever. The next movement of the vibrating lever E moves the feeding-bar forward, and so on continuously.

This machine is exceedingly simple in construction, is not liable to get out of repairs, and can be manufactured and sold at a comparatively small initial cost.

It is evident that slight changes in the construction and relative arrangement of the several parts might be resorted to without departing from the spirit of my invention; and hence I would have it understood that I do not limit myself to the exact construction shown and described, but consider myself at liberty to make such alterations as fairly fall within .the spirit and scope of my invention.

ble point it receives a longitudinally-recipro-' eating motion, as well as avariable vibratory motion, since the same is, to my knowledge, in this broad sense, not new.

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

1. The combination, with a shuttle-lever, having a laterally-extending army and a link pivoted thereto, of a feed-operating lever connected by means of the said link to the arm, and the vibrating lever connected to the rear end of the feed-operating lever by an adjustable sliding bearing fitting over a projecting finger, a sliding bar provided with a pivoted fulcrum for the teed-operating lever, and a screw for adjustably holding the bar in position, substantially as shown and described.

2. The combination, with the drivingshaft, provided with cams, and the vibrating levers, of the shuttle-lever provided with the lateral 1 y-extend in g arm and the link attached th ereto, the feed-operating lever connected to said arm by a link, and the sliding bar and movable fulcrum, all of the above parts combined and constructed substantially as described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

MILO P. SMITH.

\Vitnesses:

S. C. SAYLiN, Geo. CKNAPP.

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