US89987A - Improvement in sewing-machine - Google Patents

Description

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Sewing Machine.

Patented May 11, 1869.

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for a purpose to be hereinafter explained.

PATENT OFFICE.

LEV. GRISWOLD, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN SEWING-MACHINE.

Specification forming part of Letters Patent No. 89,987 dated May 11, 1869.

To all whom it may concern:

Be it known that I, Luv. GRIswoLn, of

Brooklyn, Kings county, and State of New York, have invented a new and useful 1mprovement in Sewing-lVIachines; and do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, making part of this specification, of which Figure 1 is a side elevation; Fig. 2, a front end elevation, and Fig. 3 a vertical section of same.

In the drawings, A denotes the table or bed of the machine; 0, the goose-neck; 1), the driving-shaft; F, the fly-wheel; G, the outer crank on the driving-shaft; and H, a link connecting the crank on driving-shaft with the crank I on the lower rocker-shaft, J. K is the needle-bar rocker, sustained by the faceplate-L and goose-neck O. Said rocker has ing and receding from the cloth, as will be hereinafter more fully explained.

S is the shuttle, connected with the shuttle-driver T in the ordinary manner, said driver being jointed to an arm, U, projecting downward from the bed of the machine, and connected by a joint-link, V, with a crank-arm, W, on the lower rocker-shaft, J, which operates said driver, by means of which the shuttle is in a state of rest at the end of its stroke, X is the feed-wheel, containing within its periphery a tri-armed friction-frame, Y. To the lower arm, Z, of this frame is attached a lever, a, by means of a screw, 12, which passes through a slot in the end of said lever. lhe

lever has an adjusting-screw, c, which abuts against the screw 12, and thereby confines the lever, by having the roller 01 in such relation with the friction-frame and the cam e on the rocking shaft J as the desired length of stitch necessitates. f is a spring connected with,

the bed-plate of the machine and the arm Y of the friction-frame for the purpose of bring ing the friction-frame back to its original position after each forward movement of the friction-wheel, caused by the action of the cam e (placed on the end of the lower rocker-shaft) on the lever to, through the roller don the end of said lever. h is the feed-wheel shaft, sus tained in a lug, t, projecling downward from the bed of the machine by a bracing-plate, k and clamping-screw l, which passes through the end of the shaft and bracing-plate. m is a hand-lever placed on said shaft, and/n is a fulcrum-pin, against which the bracing-plate bears, and which holds the feed-wheel at the desired height when placed in position by the lever m.

Having described the nature and construction of my invention, I will now describe its operation.

The machine being set in motion, at each revolution of the crank O on the drivin g-shaft the rocker-arm M, being connected with the crank-pin 0', will cause the arm P of said rocker, which is connected with the needle bar, to travel in a segment of a circle the extreme points of travel corresponding to the as cent and descent of the needle, and the crank pin 0 passing its vertical line of centers at the same time, tending thereby to cause the needle,

while entering and receding from the cloth, to move more slowly, thereby making the draft on the thread less, and this while the machine is in rapid motion and the shuttle well back, so as to obviate catching the thread coming from the shuttle on the point of the needle, which advantages are obtained by this arrangement, which places the rocker in close proximity to the drivin gshaft.

During the movements of the needle the crank-arm W on the lower rocker-shaft, which is connected with the shuttle-driver T by a joint-link, V, will, at each backward movement of the crank, cause the shuttle, after be ing carried to its extreme distance, to .dwcll for a time, or until the point of connection be tween the crank-arm and the joint-link falls below a right line and again assumes its original position, by means of which the shuttle is caused to wait for the ascent of the needle so as to draw up the stitch taut before the thread slackens that comes from the shut- Now, the length of stitch to be made in the cloth being previously arranged-via, by bringing the roller 01 on the end of the lever a over full on the circular face of the cam 19 011 the lower rocker-shaft, J, for a long stitch, and vice versa for a short one, which is done by means ofthe adjusting-screw c, which brings the arm Z of the friction-frame Y nearer or further from the cam ethe forked arms Y Y will press againstthe inner periphery of the feed-wheel X for each forward movement of said wheel as the round face of the cam comes in contact with the roller on the end of the lever, and as the flat side of said cam is presented to said roller the friction-frame will recede from the wheel until the frame is again forced against the wheel and pushed forward.

Preparatory to the foregoing operations the feed may be raised or lowered, as desired, by slacking the clamping screw Z and laying hold of the hand-lever m, the shaft h of the feed-wheel bearing on the fulcrum-pin n'at the same time, and when the height of feed is adjusted, bracing the plate against the lug by means of the clamping-screw l, by means of which the height of the feed is regulated and held firmly in position.

I do not claim a crank for driving the needle-bar, combined with a vibrating arm for driving the shuttle; but

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

1. The shaft D, arranged longitudinally in the goose-neck crank O, rocker K, arms M I, and connecting-links N Q, for operating the needle-bar, in combination with the crankarm W, link V, and driver '1, for driving the shuttle, when all are arranged and operated in the manner and for the purpose herein specified.

2. Also, the tri-armed friction-frame Y Y Y Z and lever a, with its roller d, in combination with the cam e and feed-wheel X, for the purposes substantially as set forth and described.

In testimony whereof I have hereunto set my signature this 12th day of November, A.

D. 1868. LEV. GRISWOLD.

Witnesses:

A. NEILL, ARTHUR B. WILLIAMS.

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