US86695A - Improvement in sewing-machine for sewing leather - Google Patents

Description

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INVENTOR WITNESSES 5%/ M462 z @timbri States @sind 'WILL IAM WWILSON RUSSELL, OF 'IEPIC, MEXICO.

Letters Patent No. 86,695, elated Februar/ry 9, 1869.

IMPROVEMENT IN SEWING-MACIIINE FOR SEWING LEATHER.

The Schedulereferred to in these Letters Patent and making pait of the same.

To all whom 'it may concern y Y A materials; and this I effect in part by the employment of an awl, which rst pierces the leather for the passage of the needle. l

This needle is passed into the same h ole by an arrangement of cams, which produce a peculiar swinging motion of the head of the machine, and they may also be` regulated seas to 'give-a long or short stitch, as de;

My improvement also consists in a peculiar movement of the hook or looper, which takes the thread from the needle and holds it until the needle leaves the leather, then advances and forms a loop for the awl, and retires as soon as the point of the awl passes the loop, so that the leather can be fed at the same time the thread is tightening around the awl. The presser-footis lifted at the instant of feeding the leather each time.

To morefully explain my invention, reference is had to the accompanying drawings, forming a part of this specification, of which- Figure l, sheet l, is a side elevation of my machine, showing a section of a portion.

Figure 2, sheet l, is a front-end view. Figure 3, sheet 2, is another side view, showing the cams for swinging the head.

, Figure ,4, sheet 2, is an end view, showing the mechanism for operating the hook or louper.

Similar letters of reference in each of the figures indicate like parts.

A is a base-plate, which supports the mechanism, and which may be rmly fastened to a stand or table.

From this plate thc bent arm B rises, and has the boxes O C fastened at the top.

The driving-shaft D turns in these boxes, and carries the bevelled-gearwheel E.

This wheel operates the combined bevel and spurwheel F, which, in turn, drives the spur-wheel G. This wheel is made double, as shown in iig. 2, so as to have but one bearing, which is between the two parts of the wheel.

This device allows a crank-pin, c, to be placed on each side ofthe double wheel G, which, during its rotation, imparts a rectilinear motion to the'vertical slides H and I, each of which has a transverse slotted head, J, in which the pin works, as shown.

The slide H carries the needle K, and the slide I carries the awl L, .by which the leather is pierced for the passage of theneedle.

The head M, in which work the double gear-wheel G and the two slidesH and I, is pivoted on the regulating-screw N, and, at the opposite side, on a bearing, shown in dotted lines at O.

The whole head may thus swing back and forward in the direction of the line of stitching, so that the awl may rst pierce a hole, and then, after it leaves the leather, the head swings forward to allow the needle to enter'the hole. l

To effect this swinging motion, two plates or cams, P and R, are placed on the 'back of the wheel F, these plates forming projections of different elevations. l

An arm, S, is bolted to the swinging head, and carries, at its upper end, two loose rollers or wheels, T. and U, which are moved back by the projections before mentioned, and thus swing the head.

The distance it moves, andthe length of the stitch, are regulated by the size of the roller T, which may be ,easily changed when desired.

The hook or looper V, which forms the stitch, is keyed, or otherwise fastened, to the rock-shaft W, extending along the bottom plate, and having a crank, X, at the end.

Thiscrankis -connected with the leverY by the rod Z.

The lever is operated by a cam, b, `on the drivingshaft, shown clearly at fig. 4. A collar, c, is fastened to the shaft W, and has an oblique slot, d, cut in it, .into which the end of a guide, e, projects. This causes the shaft. to slide forward at each partial rotation, carrying the hook V and the loop of the thread, so that as the awl pierces the leather, it also passes through this loop, andholds it after the hook recedes.

The spool of thread is mounted, yas shown at j', and the thread passes from it throughthe lower part of the head M, and from thence 'through the endof an arm,

y, which is pivoted at 7i, and is forced down by the' hook t'.

This hook is attached to the slide H, and, by forcing the arm down, leaves the thread loose and without tension when the needle passes through the leather, so that a loop may be readily formed.

A spring, k, raises the lever or arm g, when the nee dle-bar rises, and releases it, so that the thread again becomes tense as the stitch is being tightened.

A pin, m, on the needle-bar or slide, raises the presser foot, by coming in contact with the bent arm n, just as the needle reaches its greatest elevation, and the leather is fed by the swinging of thehead-before the awl leaves theleather. l

The operation of my machine is as follows:

As the awl approaches the leather, the roller T comes in con tact with the projecting plate P, andswings the head M back towardv the line of stitching. The awl then passes through the leather, the needle rising at the same time, and, just at the end of its upward movement, raising the presser-foot, as beforedescribed. At' this instant the roller Uv is forced out by the projection R, and swings the head still further, thus feeding the leather so far that when the head is moved'to its forward position, the needle can enter the awl-hole in .its next descent. i

f To form the stitch, the needle passes through the hole before mentioned, and as it rises, the thread being loose, a loop isformed. At the same instant the hook Vis advanced by the mechanism before described, and takes thepioop as the needle leaves the leather, and, by

lthe traversing of the-shaft, as already described, carries it forward, so that when theawl descends, it enters this loop, and holds it when the hook iswithdrawn, in order that whenthe needle descends again, it may enter the loop at the same time that the awl is withdrawn, thus` forming the stitch by linking veach loop intothe previous one, the thread being drawn around the awl by the arm` g and spring k, so as to tighten the stitohf just made, before the needle descends again to form a new one',

Having thus described my invention,

What I claim, andfdesire to secure by Letters Patent, is

1. In combination 'with the swinging head M, the

the presser, and the awl moves the materialthe lengthv of a. stitch, before withdrawing from the hole it has made, to give place to the needle, substantially as described. In witness whereof, I have hereunto set my hand and seal.

WILLIAM WILSON RUSSELL.' [L. s.]

Witnesses:

GHARLEs DIX,

'J os. W. HALE,

ISAAC V 'FowLEla

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