US12015A - robertson - Google Patents

Description

- 2 Sheets-Sheet 1. T. J. W. ROBERTSON. 7

Sewing Machine. v

Patented Nov. 28., 1-854.-

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UNITED runes. 1:1. w. noBEn'r'soN, on nnoontrn, new roan, Assrenqn Tee; I. w.

PATENT Onrren ROBERTSON AND A E.v BEACH.

I'M P ROV'E M ENT' m s EWING MAC HI NEIS;

Specification forming part of Letters Patent No. {9,0 I 5. dated November 28, 18.34.

To all whom, it may conceive Be it known that I, THOMAS J. W.- ROBERT- soN, of the city, county, and Stateof New York, have invented a new and useful Improvement in Sewing-Machines; and I do hereb'ydecl'are that the following is a full and exact descrip tion thereof.

This inyention consists in making an f interlocked stitch (such as hasheretofore been made by a needle" and shuttle) by means of a needle and insulated or detached thread-ease i thread is wound upon the spoolo, and passes through the thread-guides 70, 7c, and Z, through the point of the needle i, in the manner shown in the various figures; The other thread is containedwithin the thread-jcaset, passingout of the thread-case through an aperture'in the -5 same manner as shown in Figs. I3, 14,154 Y The cloth tobe sewed 'is placed on a'frame;

a", as seenin Fig. 3. The fiy-wheel d is fnr {n'i'shed on its inside with a cam-groove, into which one end of the working,.-bar'c projects,

so that by turning the fly-wheel an up andwhen the said thread-case and needle are" searranged and operate togeth'er as'that the loop formed by the'ne'edle thread is drawn by the needle in its return or back stroke'ov'er the thread-case to form the stitch, essentially as hereinafterdescribed; and my inventionfure ther consists in an improvement in the feedmotion.

To enable others" skilled in theart to' make and use my improvement, I will proceed to describe its construction and operation, reference being. liad'tothe'ann'exe'd drawings, form ing a part of this speeificati'on, i1'1-which--- Figure 1 1s a side View of my improveinent; Fig. 2, an end View of the same;

an enlargedjend View, showing the sliding frame and needle raised abovetheol'otlr; Fig. 4, enlarged end View, showing the sliding frame thrown down, the needle havin'geonv pleted its downward movement; Fig. 5, the same, showing position of needle when throwing the loop over point of thread-ease; Fig; 6,

enlarged-end vertical'sectionof feed apparatus;

Fig. 7, enlarged side View of same; Fig. 8; top section of a portion of arm b,- Fi'g'. 9, section of feed-bar and sliding frame throughlines-g j front end of the'supportingj-arm I) means'of Fig'.'10, sectional view, showiiiigi manner of holding thread-case, Fig. 11, feed rollerand 1 11p against onesid'e of the sliding; frame f by means of thespringn, there beinga pin on the I movable cam,- against which the spring bears. v Whentheneedle-bardescends, the pinx'passes plate, being a section through 2 2; Fig. 12 represents the needlein' its relative position to the'thread-casewhentheloopis being-thrown over the thread-ease; Figs; 13, 14,15; the thread-case detached;- Fig. 16, enlarged section of cloth, showing interlecked stitch.

Similar letters refer to like'pa-rts.

c'is the'frameof the'machine; b, supporti arm, 1), front end of arm; 0., Working-lever; 0, bearing of same; cl, fly-whee'l'; 6, connecting:- link; f, sliding' frame; f f, gibs of same; 9, needle-bar; g, pivot of same; 71, needle-bar support; h, adjustablefeed-pin; -i, needle; 73',

point of saline; 7t 70 Z, threadguides; m, movguide pi'eee, 0, spool;- p, feed-bar; p,- adjust- 1 able guide-piece; p ratchet-spring; q, feedbar connecting-rod; q, feed-bar spring; 1*, bot- }tom feed-plate; 7-, feed-wheel; s s, adjustingscrew'; 5 screw-bearing.;, t, thread-ease; t, f thread-casespring; t", thread-guide, u, threadc'ase holder; x, pin; w, side of thread-case A, 1 eloth; B, upper thread; 0, lowerthread.

'Theredl'inesindicatethethread. 'rn u per down motion is imparted to thewo'rki'ng-bar '0'. Avertical movement is communicated to the sliding frame f b'y'means of theconneetinglink 6,, which unites it with the working-bar c.

The sliding frame f slides between gibsf f, as seenin the vario'usfigures. The needle-bar is attachedto itssupport h, which latter is fastened to'th'e sliding frame-f, sothat theneedietary, and with it the needle '11, have avertreat movement corresponding to the motion of the-sliding frame f. Theneedlebar'has a i pivot atg. The needle bary'is fn'rnishedwith a" cross-head, on the inside of which there is a pin, or; Themevablec'am m is attached to the a'screw, as shown. This in ov'ablec'a'in is pressed between the cam-point m and the side of the 1 slidingjframe f; but when'the'need'lebar rises,

in eonsequeneeof the poinliim bearingll against thesideof thes'liding'frame'f, thepinm'cannot pass'between'the sliding frame 'fandthecamin thesame'manner as it did in descending"; The

pin r, therefore, bears againshthe' opposite lower side of the point m, which causes the needle-bar to take a lateral movement until it has passed the pointm, which is thicker than the other portions of the cam m. This lateral movement of the needle-bar, it will be seen, does not take place until just after the needlebar commences to rise. The bearing of the pin 0/; against the end of the cam-point m and the lateral movement thus communicated to the needle-bar g are shown in Fig. 5. As before stated, the needle 1 is attached to the needle bar g, which latter has a pivot at g, so that when the upper part of the needle-bar receives lateral movement in one direction, the needle point receives a lateral movement in an opposite direction. The thread-case f is placed just below the level of the frame. A crosssection of this case shows its sides to be angular. (See Figs. 10 and 15.) The thread-case fits into a corresponding cavityin the threadcase holder at, in which position it is retained by the spring t. The thread retained in the interior of the thread-case is drawn out through an aperture in the upper end of the threadcase, as shown. XVhen the threaded needle descends, it rises again in exactly the same direction for a short distance until the pin in strikes the lower end of the cam m. In this manner a loop is formed by the thread at the end of the needle, which loop, by the rising of the needle-bar and the lateral movement im parted thereto by the contact of the pin with the under side of the cam-point m, is thrown over the lower point of the thread-case t, and as the needle is constantly rising the loop so formed and thrown over the point is drawn round the body of the thread-caset and unites dependent, so that the loop is passed over the thread-case entirely, and with as much certainty as if a movable shuttle were employed, which was forced through ai'ace, 830. t is a guide, which prevents any failure in the loop from passing over the pointof the thread-case. Thus it will be seen that it is the retraction or back stroke of the needle itself drawing the loop over the insulated thread-case that produces the locking-stitch, or gears the two threads to form the double or interlocked stitch, without any driven action or working movement of the thread-case or other device besides the needle in its retraction, and in thus dispensing with all driving meehanism below the table or frame a a great advantage is obtained, and the carrying-arm b may be arranged to stand distinct from the table or frame a, so to admit of wide sheets of clothsuch as coverlidsbeing spread on the table and worked throughout their width. The object of the lateral play of the needle is merely to introduce the loop of the needlethread over the point of the thread-casethat is, to make the thread-case enter the loop to enable the needle in its retraction to pass the loop over the tliread-case, as and for the ob-.

ject specified-that is,to gear the two threads orform the double stitch. The lateral play of the needle, therefore, so far as this effect is concerned, need be but very slight; or the lateral play of it may be altogether dispensed with, and the loop of the needle-thread be introduced over the point of the thread-case, either by a side play imparted to the loop toward the close of the descent or early part of the ascent of thc needle, so as merely to catch the loop over the point of the thread-case; or the same effect may be produced by constructing the thread-case or its holder in any elastic, hinged, or loose manner which will admit of the end or point of the thread-case being canted, or canting itself to enter the loop of the needlethread as the loop passes the point of the thread-case, so that and in either of which cases the loop will be drawn over the thread case, thus entering it, by the retraction of the needle itself, to produce the double stitch, the same as when the needle was made to play laterally to introduce the loop over the point of the threadrase, and the thread-case be caused to retain the same stationary character or freedom from driving action or operation to pass the loop over it, which distinguishes it, as a different thing entirely, from the various shuttle motions or other separate driving apparatus for passing the loop, it being the needle itself, by its retraction, as before speci fied, that in my machine draws the loop over what may consequently be termed a stationary thread-case, to produce the interlocked stitch. \Vhere the needle having no side play is used, the feed of the cloth should take place when the needle is out of the cloth. I claim nothing new in a needle having side play.

The feeding apparatus consists of a feed-bar, p, having a lower plate, 0', on which plate the feed-roller r is secured. At (f the feed-bar is hinged to a connecting-piece, q, above. 1) is an adjustable guidepiece attached to the feedbar 1), and secured by means of an adjustable screw. One end of the feed-roller 1- is furnished with a ratchet, into which the end of the ratchet-spring 19 works. When the slid ing frame f descends, the adjustable feed-pin h strikes against the adjustable guide 1), which gives a lateral movement to the feedbar 1; and feed-roller 0", the ratchet-spring p permitting the feed-wheel 1- to turn only in one direction. The feed-bar p accommodates itself to this lateral movement by the hinge at q. (f is a spring which presses against the feed-bar 12, so that after the feed-bar has received its lateral movement by the descent of the sliding frame f, the feed-bar is thrown back again after the sliding frame rises. In this manner the cloth is fed along with the utmost regularity and certainty. At 88 is an adjusting-screw, by merely turning which the length of the stitch is regulated. The connecting-rod q extends up through an aperture in the arm 1), its upper end being pressed by the feedspring g. In this manner the pressure of the feed-roller 2- upon the cloth is rendered always even, and if there are any variations in the thickness of the cloth during its passage 7 under the feed-roller the feed-motion will operate just as well. There is an adjustable spring on the side of the arm I), which presses on the spool 0, regulating the tension of the upper thread. The tension of the lower thread in the thread-case is regulated in its exit by passing through apertures in the side or end of the thread-case. The feed-plate 7- is slotted, so as to afford an aperture for the needle to pass. The roller-1" has a groove in its center, so that the teeth of the roller may not interfere with the seam produced in the opera tion of sewing. The thread-case t is threesided, having a slide, w, by removing which.

the thread may be introdued.

Having thus described my invention, I claim 1. Making the interlocked stitch by causing the needle to pass its thread over a stationary threadcase, in which the other thread is contained, in the manner substantially as described.

2. The combination of the threadease t with the thread-case holder u by means of a spring, t, or its equivalentthatis to say, when so arranged as that while the spring holds the thread-case securely in place the thread-case holder and spring shall permit the needlethread to be drawn around the thread-case to

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