US250718A - Machine - Google Patents

Description

2 Sheets- Sheet l,4

S. ELLIOTT 85 T. B. JEFFERY.

SEWING MACHINE.

No. 250,718. Patented Deo. 13,1881.

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SEWING MACHINE.

Patented Deo. 13,1881.

NirEn STATES STERLING ELLIOTT AND THOMAS B. JEFFERY, OF CHICAGO, ILLINOIS; SAID J EFFERY ASSIGNOR TO SAID ELLIOTT.

SEWING-MACHINE.

SPECIFICHON forming part of Letters Patent No. 250,718, dated December 13, 1881.

` Application filed April 16, 187i).

` in the county of Cook and State of' Illinois,

have invented certain new and useful Improvements in Sewing-Machines; and we hereby declare the following to be a full, clear, and exl act description thereof, reference being had to the accompanying drawings, of which- Figure 1 is a side elevation ofthe part of the machine containing our improvements; Fig. 2, a front elevation of the same; Fig. 3, a vertical cross-section taken on the line x x, Fig. v1; Fig. 4, a vertical cross-section taken on the line g/ y, Fig. 1; Fig. 5, a sectional detail view, and Fig. 6 a plan view.

Our invention relates to a machine for stitching leather around cylindrical, or partly cylindrical, bodies, and it is designed with an especial view to covering metallic dash-frames.

It consists, first, in combining with a raised needle-plate a needle-bar, two independentlyoperating presser's, and a mechanism for imparting to said needle-bar and one of said pressers a vertically-reciprocating motion independently of the other presser; also, in the combination of parts by which the sewing and feeding are effected; and, furthermore, in the combination of parts whereby' the requisite motion is imparted to the upper feed-wheel, all as hereinafter more fully set forth.

In the drawings, A is the frame; B, the needle-bar; C, the needle-plate, having the raised nipple t', through which the needle passes; and D, the presser-bar, provided With the foot 7c. The relative arrangement of these parts is such that the presser-foot k is carried up and down simultaneously with the needle. One way of effecting this is represented in the drawings, Where the needle-bar in passing upward meets a pin, l, projectingfrom thepresserbar, and thus carries thelatter up with it. The presser-bar is carried upward in opposition to a spring, s', or a weight,-which operates in the usual manner to cause the foot to press, when permitted, hard upon the nipple t', or the material above the same.

We do not limit ourselves to the particular means shown for giving the described motion to the presser-bar, but only suggest that as being, in our opinion, the best way of accomplishing the desired result. The end sought is that the presser-foot shall move up and down simultaneously with the needle, being lmited,however,in its downward progress by the needle-plate, or the material upon the same, whereas the needle continues on through the plate. The effect of the action ofthe presserfoot in conjunction with the needle, as described, said foot being borne down, as stated, 6o by means of a spring or weight, is obviously to stretch the material tightly around the object which is being covered at just the proper point and at the instant the stitch is formed.

In our machine the feeding device is, as be- 6; fore stated, separate from the presser-foot above described. It comprises a lower feedwheel, E, and upper feed-wheel, E. The wheel E has an intermittent rotary motionimparted to it by means of the cam-wheel F, a pin, l', 7o thereon acting against an arm, m, pivoted to the axis of the wheel E, and projecting downward therefrom, and carrying a pawl, n, which engages at each impulse with a ratchet-disk1 o, on the face of the wheel E. The cam-wheel F is revolved by means of the shaft p, extending through the lower arm of the frame from the gearing G at the opposite end. The wheel v E is journaled to a bearing, q, at the lower eX- tremity of the vertically-sliding bar H, which Sn is raised and borne down by means of the weighted elbow-lever I, pivotcd to the frame und acting against a stud upon the bar H, as indicated by the full and dottedlines in Fig. 2.

All the mechanism above the needle-plate, including the needle-bar, is operated by means of the doubleirregular cam F F revolved by means of thezshaft p', extending from the gearing Gr through the upper arm of the frame.

The upper feed-wheel, E', occupies a higher 9o or a lower position, according to the thickness of the material, and as it is a matter of very great importance that it shall have a uniform motion and power in whatever situation it may be, We provide the following-described mechanism to effect this end:

K is a horizontal bar or plate, setting with in guides r on the frame. This bar is bent to a right angle around the edge of the frame, whereby it is brought into contact with the roo cam F', which latter thus, at each revolution, carries the said bar si dewise in opposition to the spring s, which carries it back as soon as released by the cam. Thus a horizontally-reciprocating motion is imparted to the bar K. The portion of this bar which comes in contact with the cam may be made as broad as required to maintain it in such contact whatever the height to which the wheel E is raised, and as a matter of construction we prefer to bend the end again ataright angle, in order to bring the edge against the cam, as shown at t. A lever, m', pivoted to the bar H at a point below the plate K, with its upper arm connected to the said plate and its lower arm terminating in a pawl, u', which engages with a ratchet-disk, o', on the face of the wheel E', communicates the requisite intermittently-rotary motion to the said wheel.

The take-up consists of the tubular bar L, having a vertically-reciprocating motion,which is imparted to it by means of the cam F" and elbow-lever M. This lever is pivoted to the frame, as shown at u, one arm resting against the cam-wheel and the other being connected to the bar L, as clearly shown in Fig. 3. The thread is passed through the ring c, thence entirely through the bar L to the needle, and is taken up in uniform measure by the reciprocating action of this bar;

N is a supplementary hand-wheel in the head of the frame, upon the shaft p. It affords a convenient means for starting the machine, since the gearing, or whatever the device may be which is employed to run the machine, is necessarily several feet away from the operator, and hence out of easy reach.

The shuttle-carrier comprises the shuttle-lever O (operated by means of the cam-Wheel F) and the horns w, and the whole is inclosed in the usual manner. It is usual to have the horns, one of which presses against the heel andthe other against the toe of the shuttle,

independently-operating pressers, and mechcurved outward in a horizontal plane and secured by their opposite ends to shuttle-lever. We prefer, however, to carry the horns down- Ward in a vertical plane and connect them t0 4 5 the shuttle-lever beneath the shuttle, thereby reducing the breadth to the narrowest practicable limits.

What we claim as new, and desire to secure by Letters Patent, is- 5o 1. In a sewing-machine, the combination, with a raised needleplate, of a needle-bar, two

anism for imparting to said Ineedle-bar and one of said pressers avertical reciprocating 55 4 with mechanism for rotating the same,whereby 7o` they are caused to operate as a supplementary presser and feed, substantially as described.

4. The combination of the L-shaped horizontal bar K, frame provided with the guides r, cam F', shaft p', spring s, lever m, pawl n', 75 and ratchet o', for operating the upper feedwheel, E', substantially as described.

STERLING ELLIOTT. THOS. B. JEFFERY. In presence of- SAML. C. SMITH, ALONZO F. WILLIAMS.

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