US287868A - Sewing-machine - Google Patents

Description

(No Model.)

A s. R. SARGBNT.

` SE WING MACHINE No. 287,868. Patented Nov. 6, 1883.

N. PETERS Phuiefumagnpmr. wahingm. n.6.

NITED? 'STATES-` PATENT (rlricl,V

SEWINc--MAcI-UNE.`

rSPECIFICACLION forming part of Letters Patent No. 287,868, dated November 6, 1883.V l

To au whom it may concern:

13e it known that I, SAMUEL R. SARGENT, of Terre Haute, county of Vigo, and State of Indiana, have invented or discovereda new and useful Improvement in Sewing-Machines;

and I do hereby declare the following to be' av full, clear, concise, and exact description therevation described with reference to the position a top planview of the .feed-bar and plate or of the parts in a complete machine. Fig. 3 is bar which supports it; and Figfi is a longitudinal sectional view of the shaft employed for operating the feed mechanism, the central part of the shaft being broken away. 1

My present invention relates to certain improvements iin-the mechanism employed for imparting feed in sewing-machines; and it consists, in general terms, of certain combinations of a feed-bar, a* movable two-part frame for carrying `such bar, cam and spring mech: anism for moving the frame, means forradj ustingthe cams to vary the feed, and also in the construction of such parts or devices, as hereinafter more fully described and claimed.

In the drawings, A represents a metallic plate, which is secured by lugs aand screwsa to the under side orface of a sewing-machine bed-plate,-.D, depending 'therefrom in a vertical plane transverse to the machine and at,

right angles tothe shaft B, which extends 10ngitudinally under the table, and has an end bearing in the plate A bymeans of a circular head, B, secured on the shaft, which. head rotates in` 'a` similarly-shaped opening. in the plate, the faces of the plate and head being iiush or in the same plane; also, additional bearings may be provided for the shaft at any desi-red points in its length by hangers depending from bed-plate D.' A portion only of this bed-plate is shown, and this, as well as vthe mechanism usually mounted above it for inanipulating the upper thread, also the shuttle mechanism for carrying the under thread, and

y Application filed January S, 1883. (N o model.)

the driving mechanism, may be of any suit` able or well-known forml and construction; and therefore I doV not deem it necessary to show the same herein, but have shown and described mechanism adapted for these several purposes in the subject-matter of other appli-- cations iiled even date herewith, serial numbers 81,-247 and 81,250. I-n` connection with my improved feed mechanism, I make use of a new and improved construction of lfeed-bar, C, having a serrated upper face, consisting of afront face or part, c, two side faces or partsz c c, extending back-y ward on either side of the central needle-pas sa e cand anarrow serrated face or art c2, prolonged in the central line of the needleopening beyond the termination of the side serrations. The faces c c. c are formed on the upper end of the body part of the bar, and the face c2 `upon an arm, c, which branches from such body, but is integral with or` rigidly secured to the body. Consequently all parts of the serrated face take feed motion from the bar in unison. They are all, by preference, in a common plane 5 but the narrow strip or face c2, extending beyond or in rear of the two side faces, c c', forms in effect a pivotal or turning turned with equal ease in anyand all direc tions, Veither at angles or in long orshort curves, so that fancy scroll-sewing may be Y done with ease andfacility. By providing serrated faces c c on both sides of the needle, puckering and drawing of the'cloth are prevented; and in connection with this advantageI also'secure, by means of theprolonged narrow part c2, all the advantages in turning the cloth-heretofore secured when the feedbar extends along one side only of the needle. rIhis feature of construction-namely, com- .binino` with-the twoside parts, c c', a narrow n part, c2, prolonged beyond the side parts in the central line-is an yimportant and useful improvement. passage below the fabric by a projection, a2, extending upward from the edge of the'plate A, in which is a vertical hole or passage, c3, leading downwardV by a groove in the back face' or shuttle-face of plate A.' The needle,

in its downward movement, enters this hole a3, 'and is thus protected. y l l The space ca between the front andv back The needle is guarded in itsr IOO 2 :leases serrations, c c`, is sufficient in length to reeeive the projectionr, and also to afford range of feed movement, as may be requiredin practice.

The feed-bar C is secured at its lower end, by screws c, and by dovetail tongue-andgroove connection c, to a bar, E, which is seated in a recess, a, across the top of plate A, and this bar is held in place in such lrecess, with provision for horizontal and vertical movement, by guide-lugs A', secured to plate A at or near its edges, between which is formed the guide-boxes ai".

In one end of the bar E, corresponding to the side c of the feed-bar, is made a slot, c, through which is passed a pivot-pin, c', thus preventing vertical movement of this end of the bar, but providing for horizontal or endwise movement. The other end of bar E is free to move both vertically and endwise in its guide a. This vertical movement is effective in pressing and releasing the fabric by the serrated feed-bar, and it is imparted by a cam, l, secured on rotary shaft B, which cam bears against a roller, fi', mounted on an ear or lug, if, which latter extends downward from the yielding spring-bar I. This spring-bar is secured to the lower edge of bar E at or near one end by a screw, li. At the opposite end an adjusting screw, i, passes downward through the bar E and presses against the upper face ofspring I. By turning this adjusting-screw the two bars E and I may be separated at pleasure, and as the bearing of roller i upon ca m i prevents.downward movement of the spring-bar, the bar E and feed C will be raised by such adjustment, thereby determining the distance that the feed-bar shall be raised above the face-plate under the movement imparted by the cam. The adjustingscrew if* is located under the sliding face-plate D, so that by moving such plate the screw may be reached easily by the operator. The periphery of cam yi is formed by preference with a gradial lift, as at a, and from this lift, in the direction of rotation, the periphery is circular in form, or nearly so, the length of such circular are corresponding with that part of the rotation of the shaft employed in effecting the forward movement of the feed-bar, as presently described. At or about the termination of such forward movement the radius of the cam is reduced, as at a', permitting the feed-bar to fall preliminary to being moved backward. In order, however, to insure prompt downward movement of the feed-bar, a contractile spring, mf, is secured at one end to the lower edge of Vbar E, as at m', and at the other end to the (platen, as at m2. Forward feed movement of the bars E and C is imparted by sleeve-cam R, which is secured on shaft B, and bears against a roller, 7L, pivoted between the forked arms 7L h of the bent arm II,'which latter is rigidly secured to and extends downward from the bar E. Forward motion is given by this cam R as the roller 7L travels from the lowest to the highest part on the surface, (say from o to o,') or, more properly speaking, the forward movement is given by this part of the cam pressing its rotation upon the roller which is held in or near the horizontal plane of the cam. In order that this throw may occur in proper relation to the vertical lift imparted by cam z', the two cams are set on the sha-ft in such relation that the are from o to o presses upon roller h at the same time that the raised are a a presses roller i. As the cam R turns away from roller h, the bar E is drawn backward by the spring m, which, owing to its inclined position, is effective in drawing the foar both downward and backward. throw of cam R determines the length of stitch, and in order to provide for regulating this at pleasure, the cam is made tapering or conoidal in form, with sufficient length to permit of longitudinal movement on th e shaft, and thereby vary the extent of throw which will be given by it to the roller-arm. This longitudinal movement ofthe cam is effected by means of a spindle or rod, It', which extends from the outer or left-hand end of shaft B, (see Fig. 4,) through the tubular passage bin the shaft, to a point under or within the cam, the two being connected by a screw, r, passed through an elongated opening or slot, b. This screw r has the outer face of its head conforming to the shape of the surrounding cam-surface with reference to securing smooth, continuous camface when the screw is home. To the same end the nick r in the screw-head is so made as to lic lengthwise on the cam-face when home, thereby preventing possibility of the roller h catching in the nick or wearing it out of form.

In a chamber, 0"', in the outer end of shaft B is seated a tubular thumb-screw, l), which is secured in place by a pin, a, which is passed through holes a in an outer collar, P', and in shaft B, and through the groove p, formed circumferentially in the outer surface of the barrel of the thumb-screw. The thumb-screw may thus be rotated without endwise motion. The inner tube-surface of thumb -screw is threaded, as at p', and is screwed upon the threaded end 1" of rod It, so that rotation of the thumb-screw will move the rod and its attached cam It longitudinally, thereby effecting the desired adjustment of stitch.

All the parts of this feed mechanism are plain in form, can be constructed cheaply, are easily pnt in place and adjusted, and when in place will be durable and efficient.

I claim herein as my invention- 1. The feed-bar C, having in combination a serrated face, c, in front, and two serrated faces, c c', one on either side of its needleopening c3, and a narrow serrated face, c2, in the rear, prolonged in the central line of the needle-opening beyond the termination of the side faces, substantially as and for the purposes set forth.

2. The combination of feed-bar C, horizontally movable supporting bar E, carrying 'roller-arm H, conoidal cam R, hollow shaft B,

The extent of.

IOO

IIO

rod R', and thumb-screWvP, substantially as tally-movable supporting-barE, carrying rol l-' and for the purposes set forth. 1 e er-arm H, spring m, shaft B, having tubular 3. The shaft B, having tubular passage b, in passage b, adjusting-screw P, rod.R, conoidal combination With rod R', cam R, secured to cam R, and screwsT o, for connecting the 'rod 15 5 the rod, thumb-screw P, having an" inner and cam, substantially as set for-th,-

`thread, p, adapted to runon the threaded end In testimony whereof I have hereunto set r of the rod, and a circumferential groove, p, my hand. ou itsv outer surface, and apin, u, passed through the shaft and groove, vsubstantially as Vit'nesses: 1o set forth. s l, C.V L, PARKER,

4; The combination of feed-bar O, horizony RKH. WHITTLEsEY.

SAMUEL R. sAueENT.

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