US376283A - bolton - Google Patents

Description

(Ne Medel.) 8 sheets-sheet 1.

J.' BOLTON.

FBEDING MBoHANI-SM POR SEWING MACHINES.

No. 878.288. Patented Jenhlo, 1888.

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J. BOL-TON.

PEEDING MEGHANI'SM FOR SEWING MACHINES. No. 878,288. Patented Jan. 1o, 1888.

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UNITEDA STATES PATENT Orrrerz.

JAMES BOLTON, OF GLEN SPE-Y, NEW YORK.

FEvEDlNG IVIECHANlSM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 376,283, dated January 10, 1888.

Application filed July 21, v1886.

To all whom it may' concern.-

Beit known that I, J AMES BOLTON, a citizen of the United States, residing at Glen Spey, in the county of Sullivan and State of' New York,

haveinv ented certain new and usefullmprovements in Feeding Mechanism for Sewing-Mach1nes,ofwhicl1 the following is a specification, reference being had therein to the accompanying drawings. I

The object of my invention is to provide a sewing-machine feeding mechanism which will be simple in constructionand efficient in operation, and in which the number of partswill be reduced to a minimum, so that the machine may be constructed as cheaply as possible and be very light-running. l

In the drawings, Figure I is a sectional elevation of a machine embodying my invention. Flgs. 2 and 3 are front and rear views, respectively, of the same. Fig. 4 is a bottom view. Fig. 5 is'a detail view of the feed-bar and its connections. Fig. 6 is a sectional view of the face-plate,showing the needle and presser-bars. Fig. 7 is a detail view of the presser-foot and feed-dog, and Fig. 8 is a detail View of parts ofthe feeding mechanism.

A denotes the bed-plate of theV machine, preferably made narrow, as shown in Figs. 2, 3, and 4, and cast integral with the bracketarm B. The main shaft O is preferably provided with rounded enlargements or journals c near its opposite ends to fit in concave bearings milled in the upper part of the arm, said shaft being held in its bearings by screws c', having concave ends fitting the rounded journals c. These screws not only hold the shaft securely in its bearings, but prevent endwise movement thereof', and can be conveniently adjusted to take up wear. The openings in the ends of the arm in which the shaft is journaled are made large enough to permit the said shaft, with its ball-journals, to be passed endwise through the same.

The fly-wheel D is attached to the shaft C in any suitable manner, andthe pulleyd and crank-pins d' and di are all preferably formed integral with the said fly-wheel.

Atthe forward end of the shaft O, and preferably cast integral therewith, are the needlebar-operating crank-disk c'Z and vthe disk c3, in Which is formed the cam-groove of, for operating the take-up lever a, pivoted to the face semi No. 208,940. (No moda.)

plate or cap A and provided with a pin, a',

extending through a slot in said face-plate into slid groove. l

The needle-bar E is made very short, as shown in Fig. 6, and is provided with antifriction rollers e, running between bearings, one of which is formed by a gib, a2, which may be adjusted by the screws ci* to take up wear. The needle-bar is connected with its crank by the pitman a4, which, owing tothe shortness of said bar, is made longer than usual. This short'needle-bar, with its antifriction rollers,can be run with very little oil, so that the annoyance caused by soiling the work by oil from the needle-bar Will be greatly lessened or avoided altogether.

Fis the Shuttleoperating rock-shaft, pivoted in the present instance on bearing-pins a5, passing through lugs or hangers a,depending from the bed-plate, said pins having rounded endsfitting into concave recesses in the ends of the shaft. Said shaft may, however, be provided with ball-journals like those for the main shaft O, if desired. The shaft F receives a rocking movement from the crankpin d through the pitman G, connected by thepin fwith the arm f of the said shaft. The shuttle is preferably held to the driver F by clamping-arms h, carried by a plate, H,

operated by a stationary cam, o, as more fully shown and'described in my application Serial No. 208,939, led simultaneously herewith, the said driver being in the present instance connected with its shaft by an arm, fi.y

The feed-dog t' is connected to an arm, i', preferably cast integral with the shaft or bar I, and the latter is provided at its rear end with a second arm, i2, also preferably cast integral with said bar, said arm 2 having a slot, t3, and an opening, t, the latter being of proper size to receive the rear journal pin or screw, c5, of the shuttle-operating shaft F. The arm t" is slotted to receive the shuttle-operating shaft F, and is provided with flanges i5, be-

tween which works the cam fl on the said shaft, the office of the said cam being to give up and down movements at proper intervals to the said arm 'and to the feeddog connected therewith. The arm i2 is rocked to give the forward and back or feeding movements to the feed-dog by a pin, 7c, carried by an adjustable bar or lever, K, providedv with a rack, k', with IOC) which meshes a pinion, j, carried by a small shaft, J, and having an ordinary milled lead or nut, j, by which it may be turned to a ljust the bar K vertically to move the pin L n 1arer to or farther from the center of motion of the arm t2 to vary the rocking or vibrating n ovements of the said arm, and thus regulate the throw of the fad-dog operatively conn cted therewith,asabove described. The barl asit is adj usted,slides vertically in agrooval, milled in a lever, L, fulcrumed in an upright, c", on the bed-plate, the shaftJ passing through thc block L on the lower` end of the said lever, the pitman M, by which the lever is opeiated from the crank-pin di, also sliding in the upper part ot' the said groove, so that only the horizontal movements of the said pitmau are imparted to the said lever. The groove Z may be covered by a plate, Z. It will thus be apparent that as the lever L is vibrated the bar K will be swung on the pinion j as a fulcruni, and that as the sz id bar is adjusted vertically by the said pini n the distance between the pivotal point of the said bar and the'pin k on the lever end ther of will be varied, this variation, in conne t on with the adjustment of said pin in the sl tof the arm i2, making what may be termed a double adjustment of the feed, so that but a very slight vertical movement of the pin 7 vill be necessary to effect a considerable variation to the feed. In other words, the vertieil adjustment of the bar or lever K. lengthens )r shortens the lower arm thereof, by which the arm i is operated, `and at the same time changes the position of the pin It in the slot of the arm ffl, so that if the said pin be lowered the length of its movement is increased, and at the same time it is brought nearer to the center of movement of the said arm, so that it vibrates said arm through a laiger are in proportion to the are which is traversed by itself. As the feeding movement always commences with the arm i2 vertical or in the position shown in Fig. 3, the feed, whatever its length, will always commence from the same point, the variations for different lengths of stitches being at the forward part of the stroke of the feed-dog.

It will thus be seen that as the connections between the upper and lower shafts are located outside of the arm no openings in the latter will be required for access to interior mechanism, and thus the arm, not being weakened by such openings, may be made smaller than where such openings are necessary, and will still be stiffer than usual. In practice the connections between the upper and lower shaft will be protected by a hinged guard normally held in place by a spring, but capable of being turned down when access tothe parts covered thereby is necessary.

As the feed-dog swingsin the arc of a circle in its feeding movements I prefer to arch the upper or feeding face thereof. as more clearly shown in Fig. 7, and I form that part of the presser-foot n which is rearward of the needle concave, to correspond t0 the curvature of the upper side of the feeddoff. By thus construeti ng these parts between which the work is held in feeding so that their adjacent sur faces will be parallel there will be no puckering of the goods during this operation. The presser-foot turns upward, as usual, in front of the needle to permit of the easy entrance of the work, and the bearing portion ot' the said foot is the concave part rearward 0f the needle. The presser-bar N is formed shorter than usual, and is held down against the work by an ordinary coilel spring, n', thc-lower end of which bears on a corkscrcw-thnible, asupported by a pin, L, entering sail bar. The said pin a is lixc in the head o face plate. The said thimble is provided with a milled head by which it maybe turned so that the spiral slot thereimtravcling over the saidpimwill cause the said thi nblc to be raisel or lowered to vary the stress of the spring a, is may be desired.

As the operation of my machii e in sewing is practically the ,aine as that of other similar ma hines,it will e readily understood from the foregoing by those skilled in the art to which my invent on relates, and further ex:- pla nation thereof than that alreat y given will tl e cfore not be i eccssary.

I do not claim ierein the enla ged or ball journals for th a n ain shaft C, this feature of my invention lei ig embraced by my application No. 256,685, filed December l, 1887.

Havingthus lescribed myinvention, I claim and desire to S xcnrc by Letters Pxtent arms and i?, extending above and below the said bar, and the feed-dog connected with the arm i', combined with bearings on which the said arms can rock, a cam forimparting vertical movements to the arm i and the feed-dog, and mechanism for imparting rocking or feeding movements to the said arms, bar, and feeddog, substantially as set forth.

2. lhe combination,with the feed bar or shaft I, its arms i and i2, and the feed-dog z', of the shuttle-operating rock-shaft F, arranged at the center of movement of the said arms and provided with the cam f2,and mechanism for rocking the said shaft F and the feed bar or shaft I, substantially as set forth.

3. The coinbinatiomwith the feed bar or shaft I, its arms,and the feed-dog, of the adjustable bar or lever K, having a pin working in aslot in the rear arm of the bar or shaft I,the grooved lever L, the pitman sliding vertically in and thus adapted to vibrate the said lever L, a crank for operating the said pitmamand means for raising and lowering the said feed-dog, substantially as set forth.

et. The combination of the feed barorshaft I, having two arms, to one of which the feed-dog is connected, bearings on which the said arms can rock, the adjustable bar or lever K, having a pin working in aslot in the other of said arms, said bar or lever being also provided with a rack, a pinion meshing with the said rack, the grooved lever L, the pitman M, and

`Thefeed-bai providedwiththe rigid IOO ITO

the crank by which the latter is operated,and 6. The combination, with the arched feedmeans for raising and lowering the said feeddogvmoving in a curved path, of the presserr 5 dog, substantially asset forth. foot, the bearing portion of which, fitting 5. Theconbination,with thedrivingand the against said dog, is arched rearward of the 5 shuttle-operating shafts, the feed bar or shaft needle only to correspond with the curvature and its attached parts, and the cam fz, of the of the said dog, substantially as set forth. crank-pins d' and d2, the disk or pulley loyY In testimony whereof Iaffix my signaturein zo which said crankpins are carried, the pitman presence of two witnesses.

G connected with the shuttleoperating shaft Y Io the pitman M, the grooved lever L, the bar or 'JAMES BOLTON' lever K, provided with a rack and with apin, Witnesses:

k, the pinion J, and the shaft and head for th HENRY CALVER,

. latter, substantially asset forth. E. D. SMITH.

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