US40311A - Improvement in sewing-machines - Google Patents

Description

2 Sheets-Sheet 1.

G REHFUSS SEWING MACHINE.

No. 40,311. Patented Oct-l3, 1863..

2 -sheets--s 2.

REHFUS SEWING MACHINE,

No. 40,311. Patented Oct. 13, 1863.

a 2. Fig

J Il'lmul'l @f Fig F 5- Fig' 6.

r I I if A I X M I .1 i I I "y Kl" N x $47 a A. -.sffi Y UNITED- STATES.

PATENT OFFICE. Y

'GEO.REHFU SS, .OFVPHILADELP-HIA, PENNSYLVANIA, Assrenon T0 o.'s. RAT 'rnnsomn. PINOUS, A. HART, M. MOORE, A. MITCHELL, ANDH. n. REED .UAALL or SAME PLACE.

lMPROVEMENT'IN SEWING-MACHINES;

Specification forming part of Letters 'Patent'No. 40,3! I, dated October .13, 1863 reference being bad to the accompanyingdraw; iugs,,and to the. letters of reference marked thereon. A H Myin-vent'ion consists iii-certain mechanism, described hereinafter, for making a buttonhole stitch from two threads.-

ln'order'to enable others skilled in the art to practice my invention, 1 will now proceed to describe the manner of carrying it into effect. On reference to the accompanying drawings, which form a partof this specificatiomFigure 1, Drawing No.1, is a side View, partly in -section, of a sewing-machine exhibiting. my

devices for sewing button-holes, and forcording and braiding. Fig. 2 is'a front view of Fig.'

1', andFigi't an inverted plan View.

Thefignr'es in Drawing No. 2represent diagrams illustrating the -manner of forming the stitch.

Siniilar ictters refer to similar parts through out the several .views of both drawings.

On reference to Drawing No. 1, A is the base-plate 'ot' the machine, and to this plate 'at the rear-oi the same, is secured the hollow standard B, from which projects the stationary arm B, and in 'the front end-of thisann sl des" the reciprocating needle-bar O. v

'D is the drivingshaft, turning at one end in the hollow standard'B,'and at the other; end in the head of the stationary arm B, the

front end of the driving-shaft being furnished with a crank-wheel, E, the pin of which oper-' ates in a curved slot at the rear of the needlehar, so as to impart to the same the desired .1 -,whic h passes in contact with the tension device G, the latter being a modification of ten sion devices heretofore used in'connection with sewingxnachines, and therefore requiring no elaborate explanation. From the tension device the thread a: passes through an eye, a, on the top of the needle-bar, thence through a gnidefopening at the lower end of the said bar,

and thence through the eye ofthe needle to the fabric. The spring pressure pad b isof the ordinary construction.

On the driving-shaft D, and within the hollow standard B, is apiniou gearing into a wheel, H, which turns on a stud secured to the said; standard, and which geai-s intoapinion, 1, onthe cam-shaft J,the.l"a,tter turning. in projections .c e on the under side of th'ejbaseplate A, and. the gearing being such that' the cam-shaft and driving-shaft s'halltnrn at;. t-h el same' speed. t I

0n the shaft J is a cam, f,- into thetanrved groove of which fits a pin on the -horizontal,

lever K, which has its fulcrum-on a pin, -h,'

cured to the base-plate A." jlhe .jouterent liof this'lever K is connected jby 'uieans- .of a hall? and-socket joint toone'end of-thegrod' L, the" opposite end of which is connectedpy'ag lmllj and-socket joint' to a projection, in" on an arm,

It should be-here nnderstoodthatithe pin 1' To the end of th'earni- M issecured the curved. lo'oper N throughtwogeyes', near theend of which passes 'the under thread, 3 the,

supply of the latter beingderived from aspool, v k,,on a pin attached tothe under side of the 1. base-plate. AnoIhercamEQ-is secured to the "cam-shat't J, and into the groone'ot' this cani projects apin on 'thehorizontalarm P, which isrhung to a pin, 1, on the base-plate,- the forked end 12- of this armcmbracing-a pin on another horizontal arm, P, which is hung tea 1 pin, q.' This arm P carries what I" term the curved loop-holde'r.1t. v The feeding device may be similar to those of other sewing-machines. I

S is the plate, forminga rest for the fabric, represented at X in the several diagrams illustrated in Drawing No.2, in which diagrams are also represented, on an enlarged scale, the

reciprocating eye-pointed needle F, the looper' N and the loop-holder it, which, bytheir joint action, form the desired stitch on the-edgc of the fabric X in a mannerwh'ich I will now pro ce'ed to describe: In Fig. I,'Drawing No.11,- the looper N, carrying the under thread,;l hash reached the limit of its upward vibration,and

gon'ally fora-pub ishehl hythe longer in a -proper position for "Fig. 3. Theneedle then risesfre'e from the arrow. The needle again descends in frontr tion that loops "of the under thread, w lapped orcr the edge of the "fabric Bu tljillfQP-f locked by the-npper'thread', w, and secured by 5 the needle F is intheact of descending, while theloo'per remains stationarmthe u pper thread, a:, passing through the iabric and the eye of the needle, while the under thread,y, occupies a position in fronto'fthe edge" of the fabric-- as, for instance, theedge of abutto'n-hole. As the needle descends it penetrates th'e fabric and carries-withdtthe' needle-thread w,- h'nt in the act of descending the needle, with-its thread, passes in front of ;the thread 1;, which the purpose. As the point of the needle enters the fabric the loo'per-begins todescend, carrying with it the under thread, 3;, the needle and Iooper arriving a'tfthe limit-of their downward movement simultaneously and-0c cnpying the relative nosition's illustrated in Fig. 2. The needleF then risesslightly,loop---: in g the thread 11v at its side beneath the fabric, so that it may. be caug-htfby-thc loop-holder R, which carries it to' the position shown'in opening of the loop' being increased .61 the movement of'the fabric in 'the'direction'of thethe thread, y the] .lonper also descen'dirig"tlie' instant thefneedle'has piercedthe fabric, and

'lmth simultaneously reaching the limit of their.

downward movement. i'lhenee'dle then 'as-i; -"T

cends, so as to loop, the thread at its side." The loop-holdercarries'the same t'd'th'e'po's' tion shown in Fig.'3,'and th e operiation is'co'ri tinned asrbefore.

Fig. 9, and .this'ivith the greatest precision and the desired rapiditybythe aid of the simple mechanis n'described. When there is an equal tension upon both the-threads a: and? the lock' of the stitch isfornied directlyon the center of the edge of the fabric, where it presents a1 uniform ridge, as seen in Fig. 9, Drawing No. 2. When it isdesired to form the lock or the continuous ridge of interlocked threads upon the upper edgeof the fabric the tension upon the'n-pper thread,- a}, is diminished and that upon the low'erthread', y, is increased, so that the we: thread may. drawthe lock to the top of thefa'bric. To form the lock-of the stitch upon the lower edge this operation is'reve'rse'd, the tension on the. lower thrend, y,;bein'g diminished and that ontheupper thread, in?

' creased", i v I It .Wili'he seen that it is necessary, before the descent of the needle F, for the thread carried by the looper to be so opened thatthe needle may descend between it and thelooper. This. is accomplished by cansinlgqthelooper to carry the needle,the' necessary motion ric'qit I he imparted to the loopler Nheing' attai n'edby arranging the arm M, .to' whichtlie looper is attached", diagonally upori the, bed-platen! the :tna'chin, ns idescrib'ed ah'oi e. The efiect or h at "we mo m nt of e n-emit "best'n'nj; "r'stood by referen e to an -Fi'gg-j8" )iaffiing No.2, where E rc'pre' lit s" ti c'tihn'ail plan of the needle' oit an ent t s'ca'l 'f b bi i i to m: h -mason ones taken by the oint-3 t marl-co es, ate-f retire; .sent'iiig-th'e im maturities-t rea 1- mantras? bi'xj "*P 'Itxizvill be seen from th'efforegcingdescri .the same to the fabric, seas; to ,form a stitch Witnesses HENRYYHOWSON,

ofv the characterrepreeented in the dingrairii' J'OElN WHITE;

5 the looii'd'iagonally across th'ej vertical path ot 1" a line representing theedge ot the ,vennoh' an i aesneto. secu

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