US291602A - Machine - Google Patents

Description

` (N Model.)

l l 4-Sh'eets-SheeU2. 2J; KEITH.

` SEWING lLIACHIlVI- Noga-91,602 Patented Jan. a, 1884. 7

Nl PETERS PMlo-lhhumphlr. Wnlllllginn. D. C

(No Model.)

J, KEITH. I

` SEWING MACHINE. No. 291,602.l Patented Jan. 8, 1884.

Fig. g.

(NO'MOdel.) v

J. KEITH;

` SEWING MACHINE. 1\I0.z9 1,6o2.V

Illllllllllll Y 4 Sheets-Sheet 4.

Patented Jaml 8,1834:` i

at lits oppositeend to a short lateral arm proing at its .outer end beyond the loop-con- N i rim-ED SMTS JEEEMIAH `KEITH, on ELoEENCE, MASSACHUSETTS, nssrenon To FLORENCE MACHINECOMPANY, or SAME PLACE.

sEwiNe-MAoHiNE.

' SPECEICATION forming part of Letters Patent No. 291,602, dated Jamey a, leeft.

u l l Applicaticn tiled June 9, 1853. (No model.)

Be' it known that I, JEEEML-irr KEITH, of Florence, in the town of Northamptomcounty `ofliziampshire, ,and State of Massachusetts, `have invented certain new and useful Improvements in Sewing-Machines; and I do hereby declare that the following specifica- 1 tion, taken in connection with tl1e"drawings `furnished and forming a part of the same, is

a clear, true, `and complete description of the 4 several features of `my invention.

My present improvements relate, mainly, to

, that class of machines shown and described 1883, disclose for the rst time the combina-- tion, with an eye-pointed needle and looper, of a reciprocating loop-controller which positivelycontrols` a loop during the forward movement of the looper for engaging `withfa fresh loop adjacent to the needle.

My said former loop-controller was in the form of a slender rod, bent at its working-tip, pivoted ',.jecting'from the: shuttle-driving lever, "and it had a guide-bearing between said workinga tip and said arm. Although said prior loopcontroller performs good service, it is, when operated at extraordinary high speed, more l or less liable to objectionable vibration at its` tip; and I have" now practically overcome that obj ectionby mounting my loop controller upon a slidingrod orbar which has a guide-beartroller, and sothat Said loop-controller is located between` said bearing and the pivoted `-end of the bar; and I have also somounted the loop-controlleron said bar that it may be conveniently adjusted with relation to the looper. In; orderthat said loop-controller shall,` however, be more assuredly free from vibrations at its tip or point, I have mounted it upon comparatively heavy longitudie, So far as my knowledge extends, my .p i said Letters Patent No.` 273,854, March `13,

i nally-reciprocating slidebar, which imparts` the lifting movement to the feed-bar, and em.-

e PATENT @Errcngfji ploy therewith a rock-shaft and cam for ini- 4 parting a longitudinal reciprocating movement to the feed-bar, instead of relying upon a rotating feed shaft and cam for wholly actuating thefeed-bar and vibrating my looper,

as in my last-named prior Letters Patent;

and to enable the maehineto be operated with` less power than heretofore, notwithstanding", the separate use of the reciprocating slide-v i bar and the rock-shaft and cam for actuating the feed-bar, I have combined with sai'd rockshaft and the main shaft of the machine a suspended pivoted `vibrating lever, connected at its lower end by a link to the rock-shaft, and forked at its upper end, so as to be engaged by a cam on the main shaft. employ the usual pendent lever and cam on the main shaft for operating the shuttle-'driving lever, in connection with my pendent lever for operating the feed-shaft and looper;

i stili and as` these two levers are vibrated oppo- Vsitely to each other, they are smoothly and easily operated. In order that fabriesmay be easily swung around on the work-plate for enabling Short corners to be turned, as in both plain and fancy stitching or embroidery,

it is well known to be desirable that the l presser-foot be automatically lifted at each upward stroke of the needle, so that the cloth may be freely pivoted on the latter; and, as

heretofore, for that purpose I employ a lift- `ing-lever actuated bya cam on the main shaft in the head4 of the machine, and a set or clamp screw by which the fulcrum. of the lever `may be set in varied positions,and thereby vary the degree of lift on the presser-foot; but I have improved said lifting and adj usting contrivances by mounting said lever upon a lateral slide and providing the latter with a set or clamp screw, so that the lever is supported by the slide instead of being-,supporta 4 ed kby the set-screw, as heretofore, and there- A fore the jar incident to the vibrations of the lever, and also to the alternate strains thereon at its opposite ends, are borne by said slide instead of the screw, and I have thereby pro-. vided an accurate, durable, and reliable means of adjustment.

To more particularly describe my invention I will refer to the accompanying four sheets of drawings, in which- Figure l, Sheet 1, is a bottom\view of a machine embodying my said improvements in their best form. Fig. 2, Sheet 2, is a rear end viewof the interior ofthe head of the machine, showing the main shaft, cam thereon, vibrating pendent lever, link, and the rock-shaft which imparts a forward movement to the feed-bar. Fig. 8, Sheet 2, is an edge view of the sliding bar which carries the loop-controller, and also imparts to the feed-bar its lifting movement, said feed-bar being shown in dotted lines. Fig. 4, Sheet 3, is a bottom view of so much of a machine as is deemed necessary for illustrating the loop-controller operated by the shuttle-lever, as in my prior machine, but arranged in accordance with my present invention to obviate undue vibration. Fig, 5, Sheet 3, illustrates a reciprocating slidebar provided with my loop-controller, when said slide-bar serves as the lifting medium for a leed-bar, and performs said lifting movement while moving forward instead of rearward, as illustrated in Figs. l and 8. Fig. 6, Sheet 4,y is a front view of the head of my machine,with so much thereof broken away as will disclose the cam, the lifting-lever, slide, and set-screw, by which the presser-foot is liftedpduring the operation of the machine; and the looper and loop-controller is also therein shown as if in operation. Fig. 7, Sheet 4, illustrates in detail said lifting-lever, slide, and screw detached.

In Fig. 1 mymachine is shown as if applied l to aftable and tipped up, so that the under side "of the bed-plate A and` the adjacent opmy said prior patent.

erative mechanism is fully disclosed. The oscillating looper B,with its cast-off, operates with an eye-pointed needle, Fig. 6, as in my l prior Letters Patent No. 273,854, and it is clutched to the feed-shaft C, Fig. 1, and controlled by thelever C', and thrown into service by the shuttle C2, as shown and described in The feed-shaft C, howf ever, instead of being a revolving shaft, as in as seen, in Fig. 8,with a wedge-shaped cam, c

as heretofore in other classes of shuttle mai machine' chines.' The sliding bar e is longitudinally reciprocated by means of abell-crank lever, d', and a pendent vibrating lever, d, within the rear vertical portion of the head of the The bell-crank lever cl is pivotally mounted upon the same stud, d2, upon which 'the usual shuttle-driving lever is pivoted and mounted, as indicated in dotted lines, Fig. l, 'and saidshuttle-lever is vibrated by the same pendent lever d', having its connection there` I with by the usual fork and ball, as clearly shown.

Upon the side of the sliding bar c my loop- 7o controller D is mounted, its'shank being slotted for engagement by the screw e, to enable convenient and careful original adjustment of the loopfcontroller upon the slide-bar and with relation to the looper B, as well as any neces- 7 5 sary subsequent variation in the adjustment thereof. lt will be seen that the outer end of the slide-bar c beyond the loop-controller is fitted to slide through properly-fitted guidebearings in the bracket c?, and that although 30 the short arm of the bell-crank lever ld imparts to the rear end of the slide-bar a slightly vibratory movement, this latter movement is not materially imparted to the tip or workingpoint of the loop-controller D, and that said 8; point or tip will be assuredly limited to its proper movement, and with practically no vibration, whether the machine be operated slowly or at extraordinary high speed. While, the combination including said feeding slide- 9o bar and the. loop controller constitutes one portion of my invention, it is to be understood that I do not herein limit myselfto the loop-controller so mounted, for it constitutes h a valuable improvement to mount the loop- 9 5 controller upon a slide-bar, which in no man-l ner affects the feed-bar, as is illustrated in Fig4, wherein the loop-controller D is mounted upon a sliding bar, c3, having at its outer end a slide bearing 'orI guide in the bracket c2, and an-V other bearing at c4, and said bar is connected to an arm ou the shuttle-lever by means ofthe link c5. Vth aproperly-fitted outer end bearing at 02,'the inner guide-bearing, c", may be dispensed with, and in that case the link c5 105 may alsobe dispensed with, and connection of the bar c3 can then be made directly with the short arm on the shuttle-lever, as in my prior niachine;'but this latter connection is not` ernployed by me when the slide-bara3 also'serves to actuate the feed-bar, because, in view of the extra work then performed by said 'slide rod or bar, I deem it advisable to employ the sepal rate bell-crank lever d, as shown in Fig. 1j A In those machines wherein the feed-bar is lifted by the forward movement of a sliding bar, c, it is obvious that the loop-controller D should project toward therear end ofthe sliding bar, asillustrated in Fig. 5, theslide-bear` ing in the bracket ct being slotted,k as indicated in the sectional view of said figure, to enable the loop-controller to pass to and fro freelythrough the bracket. In each instance it will be seen that the loop-controller Dis mounted upon a sliding rod or bar, which has at its outer end a slide bearing or guide, and that in each instance the said controller is adjustably mounted on said rod or bar, and those n features constitute separate portionsk of my present invention. V [13o I will next refer to Figs. l and 2 and de scribe the mechanism intervening between the main shaft E and the rock-shaft C.

While it is not broadly new to impart the IOO IIO

rocking movement to a feed-shaft by means of a cam, E', on the main shaft, Vand a pendent lever, F, pivoted upon and supported by astud, f, and connected to the feed-shaft by means of an arm, g, thereon, and a link, li, `I am the first to organize those elements in combination with a looper operated by the feedshaft; and this feature is of special value when the looper is organized to operate in the shuttle-race of a machine capable of shuttle lockstitch sewing', and also single-thread or chainstitch sewing, not only because the pendent lever which operates the feed-bar and looper can be vibrated so as to balance thel vibrations of the shuttle-levers, and thereby cause the machine to run evenly and smoothly, but

. also because a looper operating in a shuttle-race must be located between the feed-shaft and the vertical path of the needle, so as to provide for the reception of intermediate clutching mechanism, and also to allow the looper to be thrown wholly backward out of the shuttlerace when a shuttleis to be employed. The

` `upper end of said pendent lever Fis slotted or forked to receive the cam, and suitable provisions for compensating for wear are made at the cam-fork and at the connections of said lever with its pivot, Vas well as at both ends of the link. With these parts thus constructed and combined I obtain the proper movements of the feedshaft and looper with but little friction ofthe parts, and greatly contribute to light, easy, and noiseless operation. It will be obvious that the movements of the pendent pivoted lever cl,which vibrates the shuttle-lever G, and which also vibrates the bell-crank lever d, are practically opposite to the movement s of the pivoted lever, and therefore this por tion of the machine is well balanced and operates equally smooth and easy, whether the looper or the shuttle be employed.

As hereinbefore indicated, I have embodied in my machine means for automatically lifting the presserfoot, so that the fabric may be freely swiveled or turned upon or around the e5 e-pointed needle t', as in various prior machines, and I employ in this connection, as heretofore, a cam, k, at the front end of main shaft, as seen in Fig. 6, for vibrating the lifting-lever Z; but this latter is mounted by me in a novel manner, in that it is a bellcrank lever pivoted at Z to a lateral slideplate, m, which is fitted to a lateral slot in the rear side of the head of the machine. By moving the slide-plate m inwardly or outwardly the position of the pivot or fulcrum Z is varied with relation to the cam 7a and presser-foot bar n, causing the latter to be lifted more or less, as may be desired. The slide-plate is longitudinall y slotted, as clearly indicated, and its slot is occupied by a flanged nut, o, which is engaged by the thumbscrew o', which occupies a hole or seat in the rear side of the head, so that said slide-plate, after adjustment, can be readily clamped in position. These parts as thus organized by me cause the slide-plate to support the bell-crank lever and the strains thereon, instead of using thethumb-screw as the fulcrum for said lever, as heretofore; and I therefore materially obviate the liability of loosening said screw, render the latter more durable, and avoid the conscquentliability of variation in adjustment heretofore incident to the employment of the thumb-screw as a fulcrum for the lever.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent- 1. The combination, with the eye-pointed needle and looper, ofthe loop-controller mounted upon a sliding rod provided with a slide bearing or guide at its outer end and beyond the loop-controller, substantially as described.

2. The combination, with the eye-pointed needle, looper, feed bar, and reciprocating slide-bar which lifts the feed-bar, ofthe loop` controller mounted upon said slide-bar, substantially as described.

3. The combination of the oscillating looper and the loop-controller adjustably mounted upon a longitudinallyreciprocating rod or bar, substantially'as described.

4L. The combination ofthe oscillating looper operating within a shuttle-race, the feed rock shaft -for oscillatingsaid looper when clutched thereto, the link, the pendent forked lever, the main shaft, and the cam thereon, engaging with. the fork of said lever, substantially as described.

5. The combination, with the cain'uon the main shaft and the presser-foot bar, ofthe bell-crank lever for lifting said bar, the slideplate on which said lever is pivoted, and the set-screw for confining said plate in position, substantially as described.

J EREMIAI-I KEITH.

IVitnesses: A

J. C. BUcKLnr, E. L. KIRBY.

IOO

Images