US548877A - -sewifg machine - Google Patents

Description

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G. S. HILL.

A SEWING MACHINE. 'NO- 548,877- Patented 0o1..29,1.895

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IG. S. HILL." A v rsym/VIN@lvmmuvnv No'. 548,877. Patented 0615.29, 1895,

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v ANDREW B-GRAHAM.PHOYD-LITHDWASIIINGTDRDE.

GEORGE s. HILL, E HAVERHILL, MAssAcHUsErfrs,Assre-Noa oEoNE-HALE UNITED STA-TES; PATENT OFFICE.-

`froJAMEs H.. MURRAY, 0E SAME PLACE.

SEWIN'GsNIACl-HNE.

SPECIFICATION' forming part o f Letters Patent No. 548,877, dated October 29, 18,95.

Application iin-.d 'November so, 1894..` serai No. 530,297. cro maar To all whom t may concern,.-

Be it known that I, GEORGE S. HILL, of Haverhill, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in-Thread-Cutting Attachmeuts for Sewing-Machines, of which the following is a specification.

This invention relates to an improvement in automatic thread-cutting attachments for rc sewing-machines; and itconsistsin the novel features of construction and arrangement of i parts hereinafter fully described in the speci` cation, illustrated in the drawings, and particularly pointed out in the claims.

i 5 Reference is to be had to the accompanying drawings, forming a part of this application, in which like characters indicate like parts wherever they occur.

Figure l is a view of the bottom of. a sew- 'zc ing-machine, showing a part of my invention applied thereto. Fig. 2 is aside elevation of the bed-plate of a sewing-machine, showing my invention connected thereto. Fig. 3 is a front view of a'portion of a sewing-machine,

Y 2 5 showing a part of my invention applied thereto. Figs-4. and 5 represent details. Fig. 6 is a side elevation of a machine embodyingmy invention. This view is taken from the opposite side of the machine from 'that shown in 3o Fig. 2. Fig. 7 is a detail of the take-up and Vits operating-cam. Fig. 8 is a detail of the thread-nipper. Figs. 9 and lO are respectivelyviews of thebottom and top of the bedplate of the machine, showing the mechanism 3 5 attached thereto for operating the thread-ni pper. Fig. ll is a detail showing the wheel that operates the take-up and also the needlebar. Fig. 12 .is a View of the cam on the take-up wheel developed. Fig. 13 is a diagrammatic 4o View showing the position of the thread-loop, the fabric, and the Dipper-arm when the cut end of the thread is nipped. Fig. 14 -is a detailed view showing the devices connecting rod 17 to the cloth-clamping devices. y I have for convenience shown my invention applied to a machine of the class shown in my Patent No. 529,491,

My inventionis particularly adapted for machines for working bii'ttonholes or for bar- 5o ring and tacking, although it maybe applied to any machine without departing from;the scope of my invention', which includes a cutting attachment made up of a thread-cutter for 'cutting the needle-thread below the work, means for slackening the needle-thread be- 5 5 v fore each stitch, and athread nipping and pull- -iug device to hold the ,end of the needlethread at the beginning of a new buttonhole or bar or tack and pull the same down through the work. I` am thus enabled to automati- 6o cally complete the bar or buttonhole without :waste of thread and with both ends ofthe needle-.thread-to wit, at the beginning and end ofthe bar or buttonhole on the reverse side of the goods-a set of advantages that will at once commend themselves to those skilled in theart Without further description.

The overhanging arm a2, the horizontal ,main shaft d', the vertical shaft p ,driv`en by the main shaft, the cam-wheelsnffand 1o on 7o said vertical shaft, the workfholde'r h, the connections between the saine .and the-y camwheels n and p, and thegeneral form and arrangement of the machine are the same as in my former patent, hereinbefore referred to, and are only included here in order to show the connection of my invention therewith.

Referring now to Sheet l, on the front end of a shaft 197, mounted in suitable supports on 8o the under side of the machine, is secured a bel1-crank lever b', provided at ,the extremity of one of its arms with a thread-cutting knife b3. A helical springt)2 is mounted on this shaft, having one end secured to said shaft and its opposite end secured in a support or lug h6, projecting from the bed-plate t of the machine. At its rear end said shaft is providedwith a finger or projection b5. lAhorizontally-sliding bolt 20 is mounted in suit- 9o able bearings 20 on a frame 25 at the rear of the machine. At one end this bolt is arranged to engage a collar x' on a vertically-movable rod 0c, which controls a belt shipping and stopping device A helical spring 2l is mount- 95 eduponthe bolt 2O in such a manner as .to press saidbolt normally outward for engagement with the collar x. Upon the wheel p are two wipers a and b, that maybe integral with said wheel .or secured thereon, adjust- Ioo ably or otherwise. These wipers are located 1 on the wheelp about one hundred and eighty degrees apart, the wheel p rotating in the direction indicated by the arrow. The wiper a is arranged to strike a projection 34 upon a lever 33, pivoted at one end at 33, and operate said lever just before the wiper b engages the roller 24 on one end of a lever 22, pivoted between its ends at 22 to ears 23, extending from a frame 25, which is attached to the bedplate t of the machine-bed, and is ,provided with bearings 26 for a shaft 40. The end of the lever 22 adjacent to the bolt 2O is forked, as 4at 27, and in this fork a pin 28 from the bolt 20 extends, whereby motion may be communicated to said rod by said lever.

In the drawings the wiper@ is shown as attached to the upper face of the Wheel p, and a shaft 30 and its accessories are shown as located above said wheel, `while the wiper b is shown as integral with the periphery of said wheel and the bolt 20is shown as located below the said wheel. Manifestly thisarrangement could be reversedor variously modified without departing from the scope of my iuvention. Upon a shaft 30, suitably supported below the bed of the machine and above the wheel p, and to which motion .is .imparted by the shaft p by means of connections not shown, since lthey form rno Apart of this invention, being clearly shown and described in my patent hereinbefore referred to, is a sleeve 311, constructed and arranged to rotate with said shaft, but to lhave a sliding movement thereon. This sleeve is formed with a finger 32 at one end and with a grooved flange 35 at the other end` which loosely fits the forked end 36 of the lever 33. Upon the shaft 30 and between thesleeve 31 and the lug .136, which forms a bearing for the shafts 57 and 30, is arranged a helical spring 3.7,which yieldingly presses the sleeve 31 to the right in Fig. 1 in a direction away from the needle end of the machine. The arrangement of parts is such that the fingers h5 and 32 are normally ont of engagement by reason of the spring 37; but when the sleeve 31 is forced against the tension of the spring 37 toward the needle end of the machine the finger 32 will engage the finger band turn the shaft 197.

Rigidly mounted upon the shaft 40 is a sleeve 41, having two integral arms 41 and 42, the latter serving as a means to whichatreadle (not shown) or other means for operating the arm 42 can be attached. The arm 41 is provided with a slot 43, into which extends a pin x4 on the lug whereby motion may be imparted to the rod by means of the arm 41. Upon the end of the shaft 40, opposite the location of the rod 20, is rigidly secured a boss 10, having an arm 1l, provided with a pin 1,2. A lever 13, pivoted intermediate its ends at 14, is provided with a slot 15, into which the pin 12 projects. By this arrangement the end 16 of the lever 13 can be raised and lowered by turning the shaft 40. The end 16 of the lever 13 is secured toa vertically-movable rod 17, connected to the arm `h3 of the Work-holder h. This work-holder h is composed of the bottom member or base h and a top member h2, pivoted between the ears h4 on the bottom member. ber h2, extends between the ears h4 and over a An arm h3, connected to the memportion of the member h', and preferably in a recess in thelatter, and is connected to the end of a rod 17, so that the member h2 may be moved'up and down by a like movement of the rod 17 to respectively unclamp and cla-mp the goods. Mounted in suitable bearings and parallel with the shaft 57 and be tween said shaft and the end 16 of the lever 13 is a shaft 18, having mounted thereon a bell-crank lever 5, one arm 4 of which is arranged to rest upon the end 16 ofthe arm 13, While the other arm 6 of said lever is formed with a hook 7, arranged to be engaged by a projection b1@ on the arm b of the lever b. A spring 19 is connected to the lever 5 in such a way as to press the hook 7 into engagement .with the projection b1".

The operation of the portion of my invention herein described is as follows: W'hen the machine is idle, the Wipersaand b are immediately past the ends of the levers 22 and .and the knife ha to the right of the position shown in Fig. 3 and clear of the needle-thread t3. themachine the shaft 40 will be rocked, pulling down the rod n: and permitting the end of the bolt 20 to enga-ge the upper edge of the lugx. This motion of the shaft 40 lowers the By pulling down upon tho arm 42 to start end 16 of the lever 13 and the rod 17, thus bringing the member h of the work-holder upon the goods and the hook 7 into position to be engaged by the projection blo when the lever Z9 is operated. The wheel p is timed to makeone revolution during the working of a button hole or a bar, &c. When the laft stitch is being made, and while the loop is over the shuttle b4, the wiper a strikes the projection 34fand crowds the sleeve 3l toward the needle end of the machine. This mot-ion is sufficient to bring the fingers 32 and b5 into engagement, which throws the knife h3 into the loop, as show-n in Fig. 3, where it is held by the projection Z910 on the arm L9, being forced downover and under the hook 7 of the arm 6. Immediately the wiper b strikes the roller 24 upon the lever 22, withdrawing the end of the bolt 2O from the lug x', permitting the rod 00 to be forced ydownward by the spring a5 to stop the machine. This movement of the rod turusthe shaft 40, which in turn operates the lever 13, forcing the end 16 thereof upward to unclamp the goods by means of the rod 17, the arm h3, and the member h2 and at the same time raising the arm 4 of the lever 5 and turning the arm 6 and hook 7 out of engagement with the projection blo, when, by `means of the spring b2, the lever b will be turned upon the `shaft 197 and the knife b3 drawn suddenly through the loop of the needlefthr'a-d, which at this time is tightly' drawn about the shank of saidknife, thereby cutting the needle-thread and leaving the end of the thread below the work.

Referring now to Sheets 2 and 3, and particularly to Figs.V 6, 7, 11, and 12, e is a takeup pivoted at e in the casing, as is usual, and` provided at one end with a thread-eye e2 and; at its opposite end with a roller e3, which is arranged to run in a cam-groove d2 of a wheel d, that operatesboth the needle-bar d andthe take-up. It is desirable to have the thread slackened when the thread is cutto prevent` breaking the needle and to prevent the thread from flying out of the needle after being cut. The take-up rises and falls with the needle, the thread being cut when the needle is at its highest point, and in order to slack the thread at this time I form the cam-groove d2 with a projection d4 on one side and a correspond- Ving depression d5 on the opposite side, the

. plate.

projection d4 being on the side of the wheel d next the needle-bar. ByV this construction the end of the take-up is dropped suddenly for a short distance and then is held stationary while the thread is being cut by means of a straight part d3 of the groove d2 that immediatelyvfollows the projection d4. By this arrangement itvvill. be seen that theV thread is automaticallyslackened before the thread is cut, and by having thisslackening done by means of the formation of the cam-groove d2 in the wheel d the slackening of the thread can be timed to themovements of the needlebar without intermedia-te or complicated mechanism. Moreover, by having the thread slackened at each rotation of the Wheel d I am enabled to arrange the wipers ct and b to` cut any particular stitch.

Referring to Figs 8, 9, and l0, adjustably secured on the wheel p bymeans of a screw c and a slot r', is a Wiper c.V A lever c2, pivoted upon a stud c3, secured to the bed-plate tof the machine, has the end of one of its arms arranged to be engaged by the Wiper c, while the end of the other arm is loosely mounted upon a rod c4, connected to the thread-nipping bar c5, mounted to slide in a suitable support T5, secured to the bed-plate -of the machine just in the rear of the throat- Any suitable means may be employed to support and guide the bar c5. This bar c5 has a movement transverse to the bed of the machine and is provided on the side opposite the rod c4 with a finger c7, that extends across a space immediately in the rear of the space in which the needle fn plays. This linger has a notch r to engage the needle-thread and pull the cut end down through the work upon the beginning of a bar or buttonhole. The path of movement of the finger c7 is between two stops e8 and ci. A 4helical spring fis mounted upon the rod c4 between the end of the lever c2 and a shoulder f on said rod. The thread-nipper is designed to nip and hold the cut end of the needle-thread, while the end for one or more stitches and then in returning to its normal or idle position to draw the cut end of the needle thread that would Aordinarily remain on the upper or finished side 0f the work down through the work, thus forming a bar autolnatically with the end of the needle-thread at the beginning and end of the bar or buttonhole on the reverse side of the Work. f i

The operation of the nipping part of the thread-cutting attachment is as follows: The wiper c is set to engage the end f2 of the lever c2 at the beginning of the bar or buttonhole and force the finger c7, whichl normally restsagainst the stop e9, against the stop o8 after the needle has made the [irst puncture in `the goods and while the loop of the needle-thread is spread over the shuttle, as shown in Fig. 13, where n represents Ythe needle, t3 the needle-thread, #the loop, c7 the nger of the bar c5, t the fabric or goods, and t5 the cut end of the needle-thread that remains on the upper or finished side of the fabric when the needle makes its first puncture in the goods. It will be observed that as the finger is moved toward and against the stop c8 it will catch and nip the right or inside or cut end of the needle-thread and hold it against said stop. (See Fig. 8.) Now as theloop is cast off vfrom the shuttle and the thread drawn up by the take-up it 4draws the left-hand' or outside part of the loop (see Fig. 13) in the notch r on the side of the linger c7 opposite to that where the end t5 is held. The wiper c is provided with a surface r6 sufficiently extended. to operate the lever and hold the thread during oneor more stitches. As the wheel p continues to rotate, the end t2 leaves the Wiper and is draWn-suddenlyin-ward vtoward the shaftp by a spring c", attached to thearm T10 of said lever and to some stationarypart of the machine. As the finger cFI returns to its inoperative position against the stop e9,- it draws the end of the needle-thread t5 down through the work, since the regular thread t3 is intact and formed in a stitch or stitches and cannot yield. The spring f on the rod c4 allows the arm lr10 t0 hold the linger c7 yieldingly against the stop cs and thus prevent loop of-'the frst'stitch isy spread, to hold4 said ICO IIO

cutting the thread or any liability ofv breaking the several parts of the attachment.

What I claim as my invention is as follows: 1. In a sewing machine, in combination, a needle and complemental stitch-forming mechanism, a needle-thread cutting device, a thread-nipping device, both located below the Work plate, and a thread-slackening device, substantially as and for the purpose set forth.

2. In a sewing machine, in combination, al needle, and complemental stitch -forming mechanism, and a thread-nipping device arranged below the work and means for automatically operating said device to nip the end of the needle-thread and to hold the vsame du'ring one or more stitches, and then to automatically draw said end down through the work, substantially as and for the purpose set forth.

3. In a sewing machine, in combination, a main shaft (a) a needle, and complemental stitch forming mechanism, a take-up, a camwheel on said shaft (00') arranged to operate said needle and take-upr and to drop the takeup suddenly a short distance and then hold it stationary a brief length of time in advance of each descent of the needle, substantially as and for the purpose set forth.

4t. In a sewing machine,'in combination, a thread-nipping bar provided with a threadnipping finger and a rod, a pivoted lever having one end yieldingly mounted upon said rod, and means for operating the other end of said lever a predetermined distance at a predetermined time, substantially as and for'the purpose set forth.

5. In a sewing machine, in combination, a sliding bar arranged below the work, a threadlnipping finger and a rod upon said bar, a

pivoted lever having one end yieldingly mounted upon said rod, a rotary wheel, a

wiper on said wheel having a predetermined actuating surface, and means for yieldingly holding the end (f2) 0f Said lever in engagement with said wiper, substantially as and fory the purpose set forth.

6. In a sewing machine, in rcombination, a sliding bar (c5) arranged below the Work, a finger (c7) upon said bar having a notch (t3), a rod (c4) upon said bar, a pivoted lever having one endloosely mounted upon vsaid rod, a spring interposed between the end of said lever and a shoulder on said rod, a rotary wheel having a wiper for engagement with the other end of said lever for operating said lever in one direction and a spring for operating said lever in the opposite direction, su b` stantially as and for the purpose set forth.

7. In a sewing machine, in combination, a thread-cutting knife arranged below the work,

a wheel provided with-a wiper (aL-connections between said wiper and knife for operating said knife in one direction, retaining means for holding the knife in said operated position, a wiper (b) upon said wheel, and connections between said wiper and said retaining means for operating 4the latter to release the knife, and a spring for returning said knife to its normal position, substantially as and for the purpose set forth.v

8. In a sewing machine, in combination,.a shaft (o7) operated in one direction by a spring (b2), a lever mounted upon one end of said shaft having a knife at oneend and a projection (blo) at the other end, a wheel (p) provided with wipers (a.) and (b), connections between said wiper (a) andV the shaft (b7)'for setting said knife in the loop of a stitch, a latching means for Aretaining said knife in its operated position, and connections between said wiper (b) and said latching means for oper` ating the latter, substantially as and for the f purpose set forth.

9. In a sewing machine, in combination, a thread-cutting knife-lever actuated by a spring in one direction, a catch for'said lever,

a wheel provided with wipers (a) and (b),con- 7 nections including the lever 33 and the sleeve 3l between the wiper (a) and said knife lever for engaging the latter with said catch, and connections including. the lever 22 and the bolt 2O between said wiper (b) and said catch 7 for releasing the latter, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 28th day of 8 November, A. D. 1894.

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