US121477A - Improvement in sewing-machines - Google Patents

Description

- UNITED STATES PATENT OFFICE.

JOHN N. WILKINS, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SEWING-MACHINES.

Specication forming part of Letters Patent No. 121,477, dated December 5, 1871.

To all whom It may concern:

will enable others skilled in the art to which my invention appertains to make and use the same, reference being had to the accompanying drawing forming part of this specification, in which- Figure l is an end view of a part of a sewingmachine with my attachment connected thereto. Fig. 2 is a side elevation ot' my attach ment, showing those parts which are at the left hand of line .fr a' drawn vertically in Fig. 1. Fig. 3 is a vertical central section of the same, and Fig. l is a side elevation, showing those parts which are the right hand of the line a0 a.

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

My invention has for its object to provide a mechanism, which is attached either to the presser-'oot or bedJ as may be necessary, having regard to the construction ot' a sewing-machine, for the purpose of stitching button-holes or other over-edge work and the improvement consists in the employment of an adjustable presser-foot so arranged as to admit of an oscillating movement laterally with the line of the stitch, the same being imparted thereto by the automatic movement of the needle-bar, by which movement the fabric is moved laterally to the ordinary line of stitching at the proper time to form the stitch at and over its edges, the presser-foot coming in contact with and against the upper sur t'ace ofthe feedmotion alternately with the forward movement of the saine, whereby the fabric is moved forward in a direct line, thus graduating the stitch.

In the accompanying drawing, A represents a metal plate, one edge of which is bent or formed at a right angle to its side, and is secured to the presser-bar by a set-screw, a, passing through a slot cut in its upper edge. Pivoted to said metal plate is the presser-foot B, which is so arranged y as to freely oscillate upon its fulcrum. Pivoted to said presser-foot, Iabove its tulcrum, is a lever, C, the upper end of which is bent over and around the upper end of the said presser-foot, and so arranged as to have an independent oscillating movement. Firmly aixed to the front side of said lever is a cam, D, the sides of which come in contact with and against lugs d d affixed to the sides of the presser-foot, by which the movement of said lever is graduated. Attached to and within the upper end of metal plate A is a spring, E, extending upward to or near the upper end ot' the presser-foot. The said spring is provided at or near its center with a vertical slot, c, extending upward nearly to its upper end, the object of which is to disconnect the same at its point of attachment. The shorter portion of said spring is so arranged as to move within a mortise, j', cut through the upper end ofthe presserfoot, and is provided at its lower end with a lip or projection, g, which passes horizontally through a mortise in the lower portion of lever (l, above its fulcrum, by which the said lever is allowed a slight lateral movement independent ofthe presser-foot. Attached to the side of the needle-bar is a pivot, h, which is so arranged as to come in contact with and against the edges of cam D at each successive automatic movement of the bar, by which an oscillatory movement is imparted to the same. Firmly aiiixed to the lower point of cam D is a metal spring, I, so arranged as to come in contact with and against pivot L as the needlebar is moved downward, the object of which is to secure the upward movement ofthe pivot upon the proper side ofthe cam.

It will be understood that in some classes of sewing-machines the position of the presser-bar is such as to render it difficult to operate my attachment by the movement of the needle-bar when attached to the presser-bar, in which case I provide a separate attachment, which is secured to the bed-plate or' the machine in a suitable manner to'bring the presser-foot attachment in the required position with the needle-bar.

The operation of my attachment is as follows: The fabric to be stitched is placed upon the machine in the usual manner, allowing the edges of the button-hole or edge ofthe fabric upon which the stitch is to be formed to come in proper position with the needle; the presser-bar is then adjusted, which brings the t'oot against the upper surface ofthe fabric in the ordinary manner. Motion is then imparted to the needle-bar, which brings pivot It in contact with and against the edge of cam D, tilting the same laterally against lug d ofthe presser-foot, imparting to said pressienne' er-foot an oseillating movement, by Whieli the `fabric is moved the graduated length et stitch laterally with the feed and edge of the fabrie. The stitch being` formed, the needle-bar reeedes, allowing the pivot to traverse the same side of the Cam, which tilts the same to the proper position, allowing` the pivot to pass downward upon its opposite side, by which a reverse oscillating movement to the presser-foot is obtained, said presser-foot alternately comingl in Contact with the upper surface et' the feed-bar, thus moving the fabric in a direct line with its edge and at the proper time and distanee to form the required stitch.

Mbar, substantially as described.

JOHN N. WILKINS. Y VVitnessesz N. C. GRIDLEY,

N. H. SHERBURNE.

Having thus deseribed the nature and objee

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