US32925A - Improvement in sewing-machines - Google Patents

Description

C. RAYMOND.

Sewing Machine. Y No. 32,925. l Patented July 30.1861.-

N. PETERS. Pnuw-Lilhugnpher. wnhingianjrc.

UNITED STATES PATENT OFFICE.

CHARLES RAYMOND, OF BRATTLEBOROUGH, VERMONT.

IMPROVEMENT IN SEWING-MACHINES..

Specification forming part of Letters Patent No. 32,925, dated July 30, 1861.

To all whom it may concern:

Be it known that I, CHARLES RAYMOND, of Brattleborough, in the county of Windham and State of Vermont, have invented a new and useful Improvement in Sewing-Machines; and l do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figures l and 2 are elevations at right angies to each other, and both partly in section,

Y of a sewing-machine with my improvements.

Fig. 3 is a perspective view of the looper. Figs. 4 and5 exhibit the needle and looper at different stages of the operaion of making the stitch.

Similar letters of reference indicate corre` E is the needle-operating shaft, and F the,

looper-operating shaft, arranged parallel with each other in horizontal` positions, the latter in bearings underthe bed-plate and the former inbearingsin the stationary arm. These shafts arefurnished with spur-gears G H,of the same "size, gearing with a spur-gear,1, secured to the drivingwheel or pulley J, and are thus caused to he driven at uniform velocities. The shaft E also carries the feed-cam K, which acts upon the feed-lever L, the feed represented heing what is known as a top feed/and the feeding-foot L constituting also the presser.

M is the looper, made in the form of a pointed hook, nearly tlat at the point and for some distance therefrom, and with a shoulder, a, on the side next which the needle n works to spread the loop, the lower pa'rt of the shoulder being rounded oft' in such manner as topermit :it to pass freely into the loop. The said looper is pivoted by a screw-pin, b, to the. face of a.

. plate, N, which is arranged to oscillate in bracket. The looper will be understood to have a. double or compound oscillating movement-viz., the movement upon the pin b and the movement with the plate N upon the pin c.

VThe oscillating movement of the plate N is produced by a cranlnf, on the shalt F, working in a slot, j", in the said plate. The oscillating movement of the looper upon the pin b is produced by the oscillating movement of the plate N, owing to the looper being connected by a bridle-rod, g, with a fixed pin, a. This pin li is secured in arm O, cast with or otherwise secured to a cylindrical socket, l?, which is fitted to a hole provided for it in the stand A, and which is secured by means of a bindingscrew, i, screwing through the front of the stand. The pin @,upon which theplate N oscillates, isscrewed into the center ot' the socket P, and hence when the binding-screw iis unscrewed` to permit the socket Pto be turned the pin It is adjustable in an arc concentric with the axis of the pin c, which permits it (the pin h) to he brought nearer to or farther from the needle, by which means the looper is adjusted to work farther or not so far in to the loop.

Q is the thread-spool, arranged upon a horizontal pin,j, carried by an arm, D', secured to the top of the needle-bar. The said spool is Afirmly held between two cones, k l, tted to the pinj by means of a double nut, m, fitted to a screw-thread on the said pin, a spiral spring, n, being coiled round the said pin between the said nut and the cone la, and the said spring and nut holding the base ofthe cone l in contact with the arm Dl with the requisite force to cause friction enough between them to produce a desirable tension on the thread.

1t is a lever attached by a fulcrum-fimp, to the arm, D', and q is a roller attached to one side ot' the stationary arm B. This lever and roller `constitute my improved clamping device. The lever is so arranged that the point r of its shorter arm may be brought to'bear against a narrow cylindrical surface, l', provided around the base ot' the cone l, and its weight is so disposed by the coiled form of the upper part' of its longer arm as to tend'to keep the point r ont of contact with the surface Z of the cone l, and to keep its .longer arm in coutact with the roller g. The edge ofthe longer arm, which is toward the roller, has a short inclination, s, (see. Fig. 1,) which in the downward movement of the lever with the needlebar comes into contact with the rollerq just as the looper is about passing out of and liberating the loop. The lever during the greater portion of the movement of the needle does not .bear on the cone l; but when in the downward up the loop so near the cloth that the louper cannot interfere with it in its advance to form thenext loop. Theloopisnot,however,drawn up tight by this operation, but is tightened by the next upward movement ofthe needle.

The operation of the looper is illustrated b Figs. 1,4, and 5,. The needle and looper movements are so adjusted that the looper-plate N commences to move in the direction of the arrow shown upon it in Fig. l--that is to say, in a direction to carry the looper into the loop at the same time as the needle commencesis descentand that the said plate commences to move back again at the same time as the needle commences to rise. During the iirst-mentioned movement of the plate the looperis caused by the bridle-rod g to turn over in the direction of the arrow shown near it in the above-mentioned figure, and during the return movement of the plate the looper turns back again. In that figure the needle is descending and the looper just passinginto theloop. FigA'shows the position toWhich the looper has moved after theneedle has completed its descent and made about half of its upward movement. In this condition ofthe needle and looper the loop, which is shown in Fig, l as having been drawn nearly up to the cloth, has been drawn up tight against the cloth; andA Fig. 5 shows the relative positions of the needle and looper at the time when, during the descent ot' the needle, the inclinations on the lever R is just passing the roller q, the loopcr heilig j ust passing out ot the loopthrongh which the needle is descending.

What I claim as my invention, and desire to Secure by Letters Patent, is

1. Securing the lpin c, ou which the looperplate N oscillates, and the fixed pin h, to which the bridle-rod g is attached, to asocket, P, which is adjustable, as and for the purpose herein specified.

2. The bracket d, constructed with a flat inner face and applied in combination with the plate N, the looper-pin l), and the looper M, substantially as and for the purpose herein specitied.

CHA'S. RAYMOND.

Witnesses:

W. H. RAYMOND, v HENRY L. FRANKLIN.

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