US66440A - William w - Google Patents

Description

W. W. ABBOTT. SEWING MACHINE.

No. 66,440. Fatemi-.d July 9, 1867.

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4%... W. aux@ A .tititn tetris atrat @fitta WILLIAM VW. ABBOTT, OF BOSTON, MASSACHUSETTS.

` Leners Param: No. 66,440, mamy 9, 1867.

IMPROVEMENT IN SEWING MGH'INES.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, WI'L'LIAM W. ABBOTT, of the city of Boston, county of Suffolk, State of Massachusetts, have invented certain new a'nd useful Improvements in Sewing Machines; `and do hereby declare that the* following is a full and correct description of the construction and operation lthereof, reference being had to the accompanying drawings, forming a part of this specification, in which the same letters in different views refer to like parts.

Figure 1 is a sideivew of the machine.

Figure 2 is an under side view of the same, a part of the standard A being removed.

Figure 3 is aside view of the cup with its plate down.

Figure 4 is a side view of same with plate up.

Figure 5 is a side view ofthe slotted cup and its hook, with the stationary take-up, and the elastic metallic take-up, just as said elastic metallic take-up leaves the needle-loop preparatory to its being drawn up into the,

fabric by the formation of the second loop.

Figure G is an end'viewof the same from-the back side, with part of theeup out away.

Figure 7 is a side view of front and back part of spool-case. .i I

Figure 8 is a front view of front part of same.-

Figure 9 is a back view of back part of same.

Figure 10-is a view of the lock-stitch and ofthe combination called the embroidery-stitch and of the single; chain stitch..

My improvements relate principally to thatclass of sewing machines which make the lock orsbuttle-stitch from two commonstore spools of thread without re-winding, and'which employ the feeding device of ordinary sewing machines; and consist in, first, an elastic metallic take-up below the bed-plate, giving all the advantages of other elastic substances, and enabling the operator to sew dierent thicknesses of fabric without extra change of tension .or strain of thread, while it is more durable and more easily adjusted; second, in so arranging .themachinery as to enable the operator to make either'` the lock-stitch or the combination of leek and singlestitch, called the embroidery-stitch or the single-chain stitch, at will; third, in L the formation and action of a double feed-cam, so as to feed the fabric either forward or backward, at the choice of the operator,

A is the arm or frame of the machine, to which the table orplate B is attached bythe screws S. Driving-shaft O and needle-shaft Opass through said frame. C i`s the needle-bar passing through theV head of arm A. E is the presser-bar, to which is attached a foot, as in other machines in common use, with spiral spring aroundthe bar below where it passes through the head of tbe-arm A., so as to produce the proper pressure on the fabric between said foot and the plate. .l is the lifting-cam on the presser-bar, which raises it as needed. n is the needle. a is screw holding `the same in the needle-bar. X is the connecting-link uniting the needle-bar with crank F on the shaft O. L is the crank, uniting shaft O with arm M by the pin N. P is' the screw which attaches arm M--topulley Q. R is rthe set-screw fastening the pulley to shaft O. .Y is a sliding-collar on shaft 0p'rovided with cams 1 2 3 (see figs. 1 and 2) for giving motion to the feed-bar. W is the lever, whichv is attached to `plate B by a screw, l. b is'a pin attached thereto, which moves the collar and reverses the feed. 4 is an annular groove formed on the periphery offthe sliding-collar, which carries the feed cams to receive the' pin b. e is the cheek-piece'to regulate the length of stitch. -V isthe spring-wire operating on the feed to give it lthe proper movement. One end is secured to the machine by screw S. The other end is attached to the feed-dog. This spring isbent, as shown in fig. 2; `passes between the pins Uvon the lever W.. By changing the position of this lever, as shown in red and black lines, the direction of the force exercised by the spring on the feed-dog is changed. fff is the feed-frame, andj lc are projections on feed-frame. j, being pressed by cam 2, givesthe forward motion to feed-frame. k, when in contact with cam 3, gives the reverse motion to the feedframe. Cath 1 is pressed against the feed-frame to give it the upper motion. 5 is a cam attached to the hub of cup Z for the purpose of giving the lever g a vibrating motion. g is a vibrating lever having a projecting arm, g', which, beingvibrated by lever g, comes in contact with guard T of the spool-case, thus causing the spool-case to vibrate. n is a spiral spring which surroundsthe lprojecting arm g. Its force is exercised to press the lever g against cam 5. The feed-frame is suspended from 'the table or plate by means of a pivotingf assae over the ed c" P a t rod or shaft, p, which passes through the cars j" thereof, and throughthe lugs t on the under side of the table. d is a screw fastening the metallic take-up s to the back part-of cup Z. s is the pin attached to the spring or metallic take-up. -r is the front part or guard of the spool-case. y is the back part of same. z'is the stationary lip-or take-up attached to the back part of the piecey of the spool-case. o is a forked plate secured to the underside otlthe table, and preventing the spool-case from revolving with cup Z.` Z is a. grooved andslotted cup. T is the upper spool and thread held to the frame by rod K.' H is the tension-plate over which the thread T passes, and against which it is pressed by spring X. u is a screw for regulating the pressurelot` the spring upon the thread. I is the thread-guide attached to the needlebar. w is the under spool. D Darel collars on shaft O, held by screws e. Red lines on gsfl, 5, and 6 represent the upper thread. Blue lines on gs. 1, 2, and 8 represent the lower thread. H is the under tension-spring on spool-case. X, a screw regulating the same. r is a screw holding front and back portions of spool-case together.

To enable othcrsskilled in the art to make 'and use my invention, Iwill proceed to describe its construction and operation. p v,

.It will be observed that the elastic metallic take-up is attached to the cup and revolves with it, but may be placed in any other position, only that it must operate so as to control the slack thread from the upper loop, by an elastic hold of the same, releasing the loop in time to be drawn into the fabric by the formation ofthe next loop as it is drawn bythe hook around the spool-case. The advantage of a metallic elastic substance, compared withleather, bristles, or any other yielding substance, is because'of itssuperior durability and surety of action at proper time and place. The under spool is held on a screw passing through the ears of the front of thc spool-case r; and the feeding-of thefa'biic forward is similar' to that of other machines in common use, by the means of a roughened feeding surface on thc feed-frame, and bybeing pressed bya camabove the plate in contact with the cloth, and then pressing iti-against the presserAfoot, and moving sufficiently in line with the plate -asl to cause the cloth tobecarried enough to make the length of stitch. The feed-framethen drops down beyond the cloth, releasing it, while it moves back, forming the four motions, or up and down and forwardand backward feed. 4

.My improvement consists `in moving cams for operating the feed-frame, so as to produce the forward or the backward feed of thc cloth, at thcwill ofthe operator,by the simple movement of the lever which lshifts the bearing-cams. This part of my improvement is not limited to this class of machines, but may be adapted to many others; and its advantage consists in simplicity and certainty of action.

I It is well known that there are three stitches which are considered the best forrdiil'erent kinds of work, cach having its peculiar advantage. First may be considered the lock or shuttle-stitch, which, for beauty and durability, is unsurpassed by any other. Second, and-next best, is the single-chain stitch, which possesses great elasticity, and can bc easily taken out if desired. The next is the combination of the lock and single-stitch, or what maybe called an embroidery-stitch, enabling the operator to ornament garments by producing an interlaced stitch on one side, which .may be of variegated colors to please the fancy. Thisstitch is very durable.

My improvements consist in the .arrangements of machinery enabling the operator to form on one machine-` either stitch, by a simple process, without the necessity of re-winding the thread, all-of which I will further describe.V y

l Themovement of the pulley givcs'the. required motion to the under shaft, causing the revolutionof the` cupZ which contains the spool-case r y which `holds the spool w. There is attached to the cup by screws the hook L, which in its revolution catches the'needle-loop that has been brought down through the fabric by the downward movement of the needle. This motion of the needle is produced by the revolution of the pulley Q',

gij/ing a circular motionto the lower endfcthe co'nnectingrod M, which is attached to the crank L, and produces a rocking movement which causessthe shaft O to partially revolvefthus giving to crank F a. rocking .i motion that causes the needle-bar to move up 'and down at each revolution yof the-pulley. The edge ofthe spool-case, -as seen in gs'. 7 and 9, is made to tit in the groove Z in 'cup Z, which groove may be seen in figs. 3

and 4, and is prevented from turning with-fthe cup bythe fork o which is fastened on plate B, (see fw. 2.) As

- the hook revolves and takes hold ofthe' loop of thread that has been formed` by the movement of the needle below the fabric, and is being carried around the spool-case, it is spread by the wedged shape of theI hook h, so

as to cause the back portion thereof to pass into the slot on the cup back of thelhook, and is then carried'against and over the spool-case 1f' and y. Now, by the actioniof cam 5 on the lever g, the vibrating arm g is pressed against the end of guard r, thus holding the spool-case from contact with fork 'o, allowing 'a free passage for y the loop between the upper endof spool-case and fork '0, after which, by the action of the coiled spring n upon lever f/,f-the arm g is moved from guard 1', thus causing the upper end of the spool-*case to rest against fork o, allowing a free passage for the loop between guard r and arm g. It will be seen that -when the loop is carried alittle beyond half its passage over thc spool-case that it comes in contact with the stationary take-up or hook lwhich is attached to the spool-case, and that portion of theloopis so held as to 'allow the pin s to come in vcontact withthe thread close to and inside of the .hook z', and by the continuous movement ofthe cup it winds up the extra slack-of the loop, so as to take it oif the hooklz, and holds it long enough to prevent being again caught, as shown in figs. and As the pin Sf'passes beyond the range of thread it leaves the loop caught on hook z'yand-as the hook h catches the second loop it draws the first loop up into the fabric, and by its line of draught is relieved from the hook The cup has a slot in the side, back of thc hook, allowing the back portion of the loop 'to pass down inside the cup, 'as' secnin iig. 1. There is also attached to this cup a movable n in tig. 3, is placed back from the edge lof the cup, thereby causing the thread, in its 'tochange its position, so as to pass the thread over the point of the needle and above its so that the'point of the'liook takes the next loop belowthe crossing'ofthe thread on the needle, thereby plate, m, which, as see eye,

forming the combination or emln'oidery-stitch, as itdraws up the bite of thread from the under spool inte thev fabric. By cutting off or leaving out the under thread, the crossing of this thread, as the loop passes over the spool-case and the succeeding loop, forms'the single-thread or chain-stitch. The plate m, in iig. 4, is placed on theedgc ofthe cup, causing the loop, in its movement, to be dividedand pass each side of the needlegrasping the bite of lower thread, forming the single-lock or shuttle-stitch. The under thread passes from thespool inside the case, between the under tension-spring H- and the upper end of' the case, allowing the necessary tension to be given to the under thread, and is then passed through theend of the case to the cloth, as seen in g. 8. The fced-framefff is moved by the cams 1, 2, and 3. Cam 1, being fastened permanently to the shaft, raises the feed above the plate to the cloth as it feeds the same. Cams 2 3 and groove 4 are attached to orare parts of the sliding-collar Y, being feathered on the shaft, so as to move freely with -the line of shaft. When the lever Wis in theposition shown'in block lines in fig. 2, the cam 2 comes in contact with pioJ'ecticiriyI on the feed-framefff, and produces the necessary forward movement;` the return motion being communicated by spring V. By changing the position of the lever W tothat shown in red lines in fig.,2, the pin b, acting in the groove 4, moves the sliding-collar on the shaft, and also acting on the incline of the spring V, changes the direction of its pressure. In this posit-ion the cam 2 produces the backward motion and the .spring V the forward motion. i

I do not claim making the lock-stitch from two common store spools without re-windingof thread; neither do I claim an elastic take-up below the cloth when .made of any other substance excepting metal; and I do not claim a reversible feed when produced by-any method other-'than by movable cams, such having been done before. h

I do not claim a reversible feed when either compound levers or double springs are employed; neither do I claim making an embroidery-stitch from two commercial spools when the loop of thread does not pass over a. commercial spool, or when it is not formed by the combination of the lockl and single-chain stitch.

What I do claim as my invention, and desire to secure by Letters Patent, is

1. I claim the movable plate m, or its equivalent, in combination with the revolving cup Z and the hook l, when so constructed and arranged as to `form the lock-stitch, the embroidery-stitch, and the single-chain stitch at the will of the operator, substantially as set forth and for the purpose described.

2. I claim an elastic metallic take-up upon the revolving cup Z, constructed and operating substantially as set forth for the purpose specified. Y Y

3. I claim the combination of a sliding-collar with cams l, 2, and and annular groove 4, with pin b, lever W, and spring V, and pins U for changing or reversing the feed motions of sewing machines, as described.

i 4. I claim the combinationr of the stationary take-up t' with an elastic metallic revolving tri-heup s, as set forth for thc purpose specified.

5. I claim the combination of a spool-case and a grooved and slotted. cup with its hook and' movable plate m for purposes specified, as described.

. v WM. W. ABBOTT.

Witnesses: 4

E. L. PRATT, Cims. SMEAD.

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