US403951A

US403951A - Sewing-machine take-up

Info

Publication number: US403951A
Authority: US
Publication date: 1889-05-28
Anticipated expiration: 1906-05-28

Description

(No Model.) 2 Sheets-Sheet 1.

J. F. MGKENNEY.

SEWING MACHINE TAKE-UP. No. 403,951. Patented May 28, 1889.

WITNESSES: INVENTOR Z V BY 1' AM 3 MW ATTORNEY.

(No Model.) 2 Sheets$heet 2.. J. F. MOKENNEY.

SEWING MACHINE TAKE-UP. N0. 4(l3,951. Patented May 28, 1889.

WITNESSES: INVENTOR:

j. a. an 6 W- BY Crib/a /3.V(LW

I ATTORNEY U ITED STATES PATENT OFFICE.

J. FREEMAN MOKENNEY, OF BALTIMORE, MARYLAND.

SEWING-MACHINE TAKE-UP.

SPECIFICATION forming part of Letters Patent N 0. 403,951, dated May 28, 1889. Application filed August 30, 1836- Serial No. 212,168. (No model.)

To all whom it may concern.-

Be it known that I, J FREEMAN MoKENNEY, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Sewing-Machine Take-Ups, of which the following is a specification.

My invention relates toan improved takeup for sewing-machines. The construction of the parts which co-operate to accomplish the desired result of taking up the slack thread will be described in connection with the accompanying drawings, which illustrate, several forms of carrying the invention into effect.

Figure 1 is a perspective View of the arm, needle-bar, and work-plate of a sewing-machine, showing an application of the take-up. Fig. 2 is a central vertical section showing the needle-bar and take-up. Fig. 3 is a front View of the sewing-machine arm, showing the takeup and the position of the thread. Fig. 4 is a horizontal section of the head, showing the operating mechanism. Figs. 5 and 6 are views of the take-up plate, and serve to aid a description of the different positions of the thread at different points of stroke of the needle-bar. Figs. 7 and S are two views showing a modification of the take-up, the change consisting in a reversal of the position and movement of the parts shown in Figs. 1 to 6.

.- Figs. 9 and 10 are two views showing another modification of the take-up, (the parts operating the same as those shown in Figs. 1 to 6,) the change consisting in dispensing with the slot. in the head and having the thread-eyes attached to a downwardly-depending arm.

The letter -A designates the overhanging arm of a sewing-machine; A, the needle-bar head at the end of said arm; 13, the needlebar, which has bearing and vertical movement in the arm; 0, the needle; D, the workplate; D, the presser-bar; E, the cam-plate on the needle-bar; F, the crank-wheel which acts on the said cam-plate, and F the shaft on which the crank-wheel is mounted. All of these parts are of the usual or well-known construction, and are here shown merely to aid in arriving at an understanding of the invention.

The improved take-up consists, essentially, of two parts: first, a thin-plate of suitable forks k reach their lowest position.

material having the contour of one edge shaped to form a special curve, or instead of the thin plate an equivalent device would be a wire bent to produce the desired curve; and, second, an arm forked or bifurcated, and each fork provided with a thread-eye and arranged so that each of the two forks should take position on an opposite side of the said curved plate or wire. Instead of an arm with two forks, two separate arms may be used, and one of said parts be stationary, While the other is movable.

The improved take-up comprises, as stated, two parts, one of which is the plate G, having at the top and front an outwardly-curved edge, h, which is substantially the arc of a circle. This plate is broadest at that part, h, which is in a horizontal line drawn from a point, 2, which is concentric with said are of a circle. Below the broadest part, h, the plate has an inward curve, 713, which extends down to the narrowest part, k The other part of the take-up is the arm I, with the two thread-eye forks is, one of which is on each side of the plate. The eyes are designated by the letter Z. The front face of the head A in Figs. 1 to 4 has a vertical slot, m. The arm I, having the two forks 7c, is attached in any suitable manner to the movable needlebar B, and the two forks project through the said slot at in the front of the head.

The plate G is secured in a vertical position to the front of the head A, and projects therefrom edgewise and extends lengthwise of the slot in the head, and is between the said two thread-eye forks 70. A stationary thread-eye, a, is located at a suitable position. In this instance it is on the face of the head near the point whereat the vertically-movable The thread a passes through the stationary eye a, then through the eye Zof each fork, and crosswise of the curved edge of'the plate which is between the two forks, and thence to the eye of the needle 0. While the position of the stationary thread-eye a may be varied on the sewing-machine head, this variation must be within certain defined limits. It is essential to the proper and best action of the take-up that this stationary thread-eye should never be located above the plane of the extreme downward limit of travel of the movable or below said limit.

thread-eyes carried by the needle-bar; but it may belocated either at said downward limit The thread passing over the take-up plate should never pass below the stationary thread-eye, since it is essential that during the upward movement of the thread-eyes on the needle-bar the slack in the? thread should be taken upv by the action of the take-up plate, and this can only be ac--, complished by having the stationary thread eye or thread-guide at or below the lower limit of travel of the thread-eyes on the nee-, die-bar, since otherwise there would be slack thread between the stationary eye and the movable thread-eyes during the first portion of the upward movement of the needle-bar, which would prevent the proper operation of the take-up. By this arrangeinent'the two forks-7t, throughwhich the threadpasses, are.

movable, and the plate with the curved edge ,isstationary. The relative position of these two parts, however, may be reversed-th at is,

the forks maybe stationary and the plate.

movable, as in Figs-7 and 8.

In the present instance the thread-eye forks 1c of the take-up I are shown attached di-: rectly to the needle-bar; but inasmuch'as the 'camrpl ate E, fixed on' the needle-bar, is movablegpart, it is obvious that the-thread-v eye forks maybe attached to the said camplate and project therefrom-at each side of theneedle-bar.

, The distinguishing feature of this iinven: tion is'in theplate having at thetop and front the special outward curve, h,forming substantially the arc of a circle. In the descent: of the needle-bar the thread-eye forks k,- from; thepoint 1, (see Fig. 5,) keep the thread drawn taut over the plate-edge at the top curvejh, and this taut condition continues until the thread-eyes pass below the point 2, which'is concentric with the saidtopcurve, at which time the point of theneedle will have pene-- 'tratedthe material to be sewed. Uptothis. time thethread over'the top curved edgehas been gradually slipping down around the curve; but all the while the thread hasbeen held up, and thereby the formation'in-it of a loop'which would interfere with the needle has been .prevented. WVhen the thread-eye forks Z in the downward movement reachthe inwardcurve, h at the point 3, the thread has become slack'and-at this moment isjin condition for the shuttle to pass between it and the needle. Uponthe needle-banwith the eyes at the point 4:, (see-Fig. 6) beginning to ascend after the shuttle has passed the slack- -thread is takenup by the thread-eyes (beginning at the point 5) drawing the thread up in contact with the inward curve, b and this takingup'continues untiljthethread on the plate-edge passes the broadest-part, h--say,

atthepoint 6--at which time, also, the shuttle-has completed itsforward movement and the stitch is being drawn to its full tension. InFigsu7 and 8 the two takeup parts-=to *wit, the special-shaped plate G and the two thread-eye forks lo, one .011 each, side of the plateare reversed. The plate G has the outwardly-curved edges h, which forms the arc of a circle at the bottom instead of the top, and instead of being stationary, as in Figs. 1 to 4, it is attached to the needle-bar B and is therefore movable. On the other hand, the two forks k are secured to the front of the head A, and are therefore stationary. The shape of the plate G in this case being the same asbefore described, the result is the same. The threading is a little different. Here the thread a'passes through a hole, q, in'the top of the needle-bar and then down through the thread-eyes Z.

Iii Figs. 9 and 10 the plate Gris stationary and the thread-eye forks 7c are movable-same as in Figs. 1 to 4. Thereisno slotjin the front face of thehead. This is rendered-unnecessary-because each thread-eye Zis atthe lower extremity ofa downwardly-depending arm, k, whose upper end, 7c is attached to the needle-bar B at a point abovehead A. The operation is the same as the construction shown in Figs. 1 to-i.

Having described my invention,I claim and desire tosecure by Letters Patent of the United States-- 1. In a sewing-machine embracing ahead having a front face provided with a vertical slot, 'm, a needle-bar, and a shuttle,the' combination therewith of the take-up, consisting of two forks, k, attached totheneedle-bar and each provided with a 'threadeye,"and a plate, G, having-at the top and frontan outwardly-curved edge, h, forming, substantially, the are of' a circle whose lower portion terminates at the broadest part' of thepl-at'e-and having below said broadest part an inward curve, 72. saidrplate extending lengthwise of the vertical slot and having positionbetween the said two thread-eye forks, as set'forth.

2. Ina sewing-machine, the combination, with-the needle-bar and shuttle, of a take-up, one part thereof consisting of two forks, k,

each provided with a thread-eye, and another part consisting of a ;plate,G,having*at one end a front outwardly-curved edgeyh, forming, substantially, the are of a circle; one portion 'of which terminates at the broadest part of the plate andhaving'aninward curve-7L said plate extending vertically-and-having position between the said two thread-eye forks,one of saidparts being movable-and the other stationary, as set forth.

3. In-a 'sewing-machine,the stitch-forming mechanism thereof, in "combination with a take-up, one part'thereof consisting of *two thread-eyes and another part consisting of a plate between said threa'd eyes, said :plate having a cam-shaped outer edge curving inwardly-both above and below its broadest part, one ,of said parts being movableand the other stationary, substantially as set forth.

4. Ina sewing-machine, the stitch-forming mechanism thereof, in "combination with a take-up, onepart thereof consisting'of 'two thread-eyes and another part consisting of a plate having at one end an outwardly-curved inclined edge, forming, substantially, the arc of a circle, one portion of which terminates at the broadest part of the plate and having an inward curve, said plate extending vertically and having position between the said threadeyes, one of the said parts being movable and the other stationary, substantially as set forth.

5. In a sewing-machine, the head and stitchforming mechanism thereof, the needle-bar of said stitch-forming mechanism, and two thread-eyes carried by said needlebar, in combination with a stationary take-up plate located vertically between said thread-eyes, said plate having its outer edge curved or camshaped, the upper portion of said edge being curved downwardly and outwardly and terminating at the broadest part of said plate, and the lower portion of said edge curving from the broadest part of the plate downwardly and inwardly, substantially as set forth.

6. In a sewing-machine, the head and stitchforming mechanism thereof, the needle-bar of said stitch-forming mechanism, and a take-up consisting of two thread-eyes carried by said needle-bar and of a stationary plate extending vertically between said thread-eyes, said plate having its outer edge cam-shaped and curving inwardly both above and below its broadest part, in combination with a stationary thread-eye on the sewing-machine head, through which the thread passes before passing through said thread-eyes on the needlebar, said stationary thread-eye being located at 01' below the extreme downward limit of travel of said thread-eyes on the needle-bar, substantially as set forth.

In testimony whereof I affix my signature in 40 the presence of two witnesses.

J. FREEMAN MCKENNEY.

Witnesses:

JOHN E. MoRRIs, bro. '1. MADDOX.