US88039A - Improvement in sewing-machine - Google Patents

Description

M. c. HAWKINS;

Sewing Machine. No. 88.039. Patented March 23, 1869.

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tititml 5mm M. C. HAWKINS, OF EDINBOROUGH HI'MSEL PENNSYLVANIA, ASSlG-NOR TO F AND AQZ. WATERS, OF SAME PLACE".

Letters Patent No. 88,039, dated March 23, 1869.

IMPROVEIilENT IN SEWING-MACHINE. I

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern.-

. Be it known that I, M. O. HAWKINS, of Edinborough,

in the county of Erie, and State of Pennsylvania, have invented a new and improved Sewing-Machine; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to a new and improved sewing-machine, of that class which are provided with a reciprocating shuttle, and are commonly termed shuttle-machines.

The invention consists in the means employed for operating the looping-hook and feed-bar.

The invention also consists in an arrangement of a looping-hook and cam, and a rebate in the face of the shuttle,=-for the purpose of' 'retaining the thread below the shuttle while the latter is passing through the loop, whereby a steady motion of the needle-bar is obtained, together with a greater certainty of taking up the loop.

In the accompanying sheet of drawings- Figure l is a side sectional view of my invention, taken in the line a: x, fig. 2.

Figure 2, a front sectional view of the same, taken in the line 3 y, fig. 1.

Figure 3, a rear-end view of the 'same in elevation.

Figure 4, a sectional View of a portion of the same, taken in the line z z,'fig. 1.

, Figure 5, a detached view ofga part pertaining to the same.

Similar letters of reference indicate corresponding arts. p A represents the cloth-plate of the machine, which has the usual support, B, attached, to sustain the needle-bar O and its driving-shaft D E is a shaft underneath the cloth-plate, which drives the shuttle and other working-parts.

This shaft E derives its motion from the shaft D, as follows:' v

The shaft D is driven by a belt passing over a pulley, a, at its rear end, said pulley being attached to a fly-wheel, b.

F,is a pitman, the upper end of which is connected, by a pin, or pivot, c, with thepnlley a, at one side of its centre, as shown clearly in fig. 3, the lower end of the pitman being provided with a wrist-pin, d, which is fitted loosely in a slot, 6, in a wheel, G, at the rear end of the lower shaft, E.

The pitman F is peculiarly arranged, and operates as an ordinary pitman and lever combined, the pitman bein connected by a fulcrum-pin, j, to a slide, 9, which is fit ed and works within a suitable guide, H, attached to.the rear of the support B. I

This arrangement, it will be seen, admits of the upand-down movement of the ordinary pitman, or connecting-rod, while. at the same time, it adi'nits of a leverage-movement being obtained as the connections of the pitman are passing the centres, the leverageaction keeping up the motion at the points where the ordinary p'itman is necessarily sluggish, ahd insuringan equable motion throughout.

The needle-bar O is driven as follows:

This bar is fitted in bearings 7th, at the front end of the support B.

On the needle-bar G there is fitted, and firmly secured, a horizontal way, or guide, I, in which a wristpin, *5, works, said pin bcin g attached to and projecting from a wheel, j, on the front end of the shaft D.

The way, or guide, I, is not fitted centrally on the needle-bar 0. One end projects from-the needlebar at a greater distance than the other, as shown clearly in fig. 2.

The object of this is to bring the wrist-pint as nearly as possible in line with the needle-bar, while the same is making its downward stroke and performing the heaviest portion of its work, thereby greatly relieving friction, and insuring a smoother action of the machine.

On the shaft D there is a cam, k, shown in fig. 1, which actuates a bent lever, J, having its fulcrum, l, on the support B.

This lever projects forward sufiiciently far to admit of the needle-thread passing through it, and the cam k, when the machine is at work, operates the lever J, giving its forward end an up-and-down motion, the upward motion being given at the, time when it is necessary to take up the slack of the needle-thread. This will be fully understood by referring to fig. 1.

On the front end of the lower shaft, E, there is keyed a wheel, m, having a wrist-pin, n, projecting from it at one side of its-oentre,.or near its periphery.

This wrist-pin projects through a yoke, K, which is fitted between suitable guides o 0, at the front part of the machine, underneath the cloth-plate.

The yoke consists simply of a plate, 1), having anoblong vertical slot, q, made in it, through which the wrist-pin passes, the latter giving the yoke a recipro-. cating motion, and the yoke operating the shuttle L, which is fitted between arms 7', projecting from the upper part of the yoke over a horizontal 'way, 8, on which the shuttle works.

By this arrangement, the shuttle is operated with but little friction, and with a uniform motion.

At the front part of the machine, underneath the cloth-plate, there is attached a pendant, it, from which a fixed arbor, u, projects horizontally toward the yoke K.

On this arbor u there is fitted a pipe-shaft, which has three cams upon it, a b c. 1

The pipe-shaft is rotated by the wrist-pin n, the outer end of which passes into a slot, (1, in the edge of a wheel, M, on the inner 'end of the pipe-shaft. (See figs. 1 and 2.)

The cam a operates the looping-hook N, (see fig. 4,)

which is pivoted-to the rear side of a plate, 0, secured' transversely underneath the cloth-plate A.

Thewayfs is attached to the rear of this plate, and

to the front end of it the feed-bar P is attached, and secured in position by a screw, 0, which passes through an oblong slot, f, in one end of the feed-bar. (See fi 2.)

This feed-bar is operated by the two cams, b o, the cam b, which gives the vertical play, operating against an adjustable arm, g, connected to the 'feed-bar, by raising or lowering which the vertical play may be regulated, as desired. I I

The longitudinalmovement is given the feed-bar by the cam c, which operates against a yielding pivoted lever, h, behind, or at the outer side of which there is a fixed arm, 1', provided with a buffer, j. (See fig. 2.) At the slotted end of the feed-bar there is a fixed pendant, k, which, at the termination of the movement of the feed-bar in the direction indicated by arrow 1, strikes against the bevelled end 1' of a bar, R, underneath the cloth-plate, (see fig. 5,) said bevelled end serving as a stop for the feed-bar, and regulating the length of the stitch.

The bar R is adjusted to effect this end by means of an eccentric, m, and rib n.

The lever h, and fixed arm i, provided with the buffer compensate for the variation in the movement of the in order to vary the length feed-bar, which is necessary, of the stitch.

When the stroke, or movement of the feed-bar is short, the lever h acts against the bufl'erj', reducing noise, and insuring an easy and uniform motion of the feed-bar.

The under, or face-side of the shuttle has a. longitudinal groove, or rebate, It, made in it, to retain the thread below the shuttle while the thread is passing the loop.

This groove, or rebate is shown clearly in fig. 1.

I claim as new, and desire to secure by. Letters Patent- 1. The combination of the feed-cams, and the disks M m, with the wrist-pin n and yoke K, all constructed substantially as shown and described.

2. The shuttle L,when provided with the rebate k, for the reception of the looping-hook N, for the purpose ofretaining the thread below the shuttle while the latter is passing through the loop, as herein set forth and shown.

3. Operating the looping-hook N and feed-bar P, through the media of the cams a b c, lever h, and the fixed arm 11', provided with a buffer, j, all combined and arranged substantially as and for the purpose specified.

M. O. HAWKIN S.

Witnesses A. M. GREENIJEE, M. PHELPS.

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