US103444A - Improvement in sewing-machine - Google Patents

Description

M.P.GERAGHTY.

SEWING MACHINE No. 103,444. Patented May 24, 1870.

named.

dinitui swa MICHAEL E. GERAGHTY, OF JERSEY CITY NEW JERSEY, ASSIGNOR. TO- THOMAS J.

MCARTHUR, OF NEW YORK CITY, AND ISAAC W. PARMENTEE, OE NEWARK,

NEW JERSEY.

Letters Patent No. 103,444, dated llfay 24, 1 870.

IMPROVEMENT IN SEWING-MACHINE.

the Schedule referred to in these Letters Patent and making part of the same To all whom it may concern Be it known that I,MIOHAEL F. G Jersey City, in the county of Hudson New Jersey, have invented certai Sewing-Machines; and I (lo-hereby declare that the following, taken in connection with' the drawing which accompanies and forms part of this specification, is a description of my invention suflicient to enable those skilled in the art to practice it.

My improvements relates to a. novel mode of connecting and operating the upper and lower parallel shafts, and revolving said shafts in the same direction to the feeding devices, and to other parts, hereinafter ERAGHTY, of and State of n Improvements in The objects of my improvements are the attainment of increased simplicity and cheapness of construction, approximate .noiselessness in action, and the avoidance of backdash'.

Figure l is an elevation, a. portion of the upper part of the machine, not necessary to be shown, be ing cut away; I

Figure 2 is a plan of the under side of the machine;

Figure 3 is an end view of the front part of the machine, showing devices beneath the bed-plate Figured isa detail view of the feeding device; and

Figure 5 is a cross-section through the feed-dog and its movable slide.

The frame of the machine is shown at A, and it is castin' one piece, and with hearings or hangers adapted to receive and sustain the upper revolving shaft B and the lower revolving shaft 0, so that these shafts shall always be insured perfect parallelism relativelyeach to the other, and cannot get out of line; thus avoiding a difficulty of a serious character, often encountered where the goose-neck' is made in a separate piece, and requires, therefore, the most accurate adjustment relatively to the bed-plate and the'mechanism beneath the table.

The lower shaft revolves in the hangers D and E, and its forward end projects beyond the hanger E, and beyond the shuttle-race F, such part beyond the race being the part which imparts the movements to the feeding-dog andto the shuttle, in a direct manner, and without the usual intermediate connections, as hereinafter set forth..

The upper shaft is shown as the driver, but the 1ower,if desired, may be the driver, and it gives motion to the lower shaft by means of a double connection, composed of two connecting-rods or links, each reaching from one to the other shaft.

One of these rods, G, is directly connected, at either end, to acrank on each'of the shafts, the cranks being marked H, and the other rod, G, is connected by straps to the eccentrics I I on the shafts. The

crank and eccentric on either shaft are set relatively to each other, so. that the one shall be somewhat in advance of the other, thus avoiding any irregularity v avoids the doubling of any irregularity or back-lash;

which occurs when a rod so connects shafts, that they revolve in opposite directions. any slot or pin to sustain the rod midway of its ends,

and avoids thefriction and wear incident thereto.

Instead of driving by [two eccentrics for one rod, and two cranks for the'other, each rods-may have a crank at one'end and an eccentric at thepther, there being a crank and an eccentric for each shaft, and this I deem the equivalent of the construction shown and'above described, and provision may be made for the adjustment of the eccentrics or of the cranks upon the shafts, if desired.

To the extreme forward end of the shaft 0, and beyond its forward hanger, and forward of the shuttlerace F, is secured the crank L, which drives the shuttle-carrier, L, by means of the connecting-rod L, the carrier running in a race or way, L.

This piece, in which the carrier reciprocates, has, at each end, a rib, 1, entering a groove, 2, in the banger'3, on the bed-plate, and fitting it snugly, except that it does not reach to the top of the groove. This provision, whilst firmly holding the piece to place, also allows of elevating the piece to meet any wear caused by the carrier,

In immediate juxtaposition to the hub of this crank, and just back of it, and forming part of it, is an eccentric, M, located in the same vertical plane with the opening in the bed-plate, through which the feed-dog operates when feeding. v

This feed-dog, N, at its lower end, is bored or cut to receive the eccentric M, from which its feeding movement is-derived, and is otherwise a solid piece, having no cuts nor slots, on which it must ride and wear. This piece is sustained snugly between the hanger E and the hub of the crank, and has .no opportunity of becoming dis= placed or deranged. The revolution of the shaft gives it positive motions, both up and down, and forward and back, no springs or other auxiliaries being used with it for the purpose of assisting it in its movements'. 4

.The means for controlling the forward and back ward throw of the dog, to vary the length of feed, are as follows: y

A slide, ,0, so made as to embrace the dog atits two edges, is appliedto it, and it is free to be moved up and down upon it'qto or from its center of motion,

And it dispenses with nor pins passing through it 'swiveled, as shown at 12.

- the length of feed is wanted, by the hand-lever S, the

-the shaft 'may have the eccentric made upon or applied directly to it.

and then held in position by the arm P, to which it is This arm P is rigidly afiixed to 'a rock-shaft, Q, hung in suitable bearings, and having, at its other end, an arm, \Vhich is actuated whenever a change of latter being arranged so as to be accessible from" the upper side of the table, at a convenient place within reach of the operator.

It will be seen that a feed-dog, controlled and operated as described, has but little wear upon it, and when set for a given extent of feed, will continue to measure, with great uniformity,-the same length of stitch without variation; also, that the noise and rattle incident to a slotted dog, playing upon asmall pin, which is constantly wearing away by its frictional contact with the slot, are entirely avoided; also, that the swiveling character of the slide, in connection with its length, affords a close contact of the sides of the slide with the dog, under all adjustments, and more than suliicient to meet the little wear that may occur in practice, so that rattling from this or from any cause is next to impossible.

Instead of the eccentric on the sleeve of the crank L, to impart the positive movements to the feed-dog,

For the purpose of readily lowering or raising the roughened upper surface of the feeding-dog,.to adapt it for more efficient action upon various kinds. of fabrics, I have furnished my feeding-dog '.with a movable piece, a, which is adjustable, vertically, by means of a set-screw, as shown. This piece is sunken in an appropriate rebate in the feeding-dog, and it may or may not be used, as desired. The dog N itself may have the roughened or acting feeding-surface upon its upper end, and the piece it would, in such case, be dispensed with.

The frame A of the machine, and which supports all the working parts, except the slnlttle-carrier, is made from a single piece of casting. I

I am'aware that, in some simple kinds of sewing-machines, intended to be driven by hand, the frame has sometimes been made in a single piece, but none, I believe, have ever been so made in which'a shuttle has been employed.

In my construction, the goose-neck (so called) is integral and continuous with the part A, to which are also-cast the bearings D E for the lower shaft, these bearings heing, as heretofore stated, so located as not only to insure perfect parallelism of the upper and lower shafts at all times, and thus secure trueness of position and action, but the forward one being so located as to throw both the crank for the shuttle and the feeding-dog in front of the race.

This construction absolutely prevents any displacement of the upper or lower parts relatively to each other, and permanently preserves, in their relative for joint operative action, and when once put together," they cannot become displaced with regard to eachother, and must work true and in harmony,

The lower part of this frame also forms a support for the work-supporting plate, and which latter is secured to it.by screws, as shown, or otherwise, and has affixed to it the shuttle-race, which is, therefore, removable with it from the machine.

The shuttle-driver, as will be seen, is so shaped thatthere is no tendency, by its own gravity or its U331 versing mevements,.to lean or droop at its'u'pper end" Such tendency in toward the face of theshuttle. machines, as usually constructed, is a serious detri- -ment, as it causes the shuttle, after the machine has been run a short time, -and,there has been-a little wear on the driver, aud'the ways in which it runs, and, consequently, some lostmotion, to hug more and more tightly againstnthe face of the race, thus rapid- ;ly wearing out the face of the shuttle, and greatly increasing friction, I and causing the machine to run heavily. This is positively prevented inmy machine,

by so making the driver that its cradleor upper part shall have its center of gravity fall inside and in the rear of avertical line passing through its center of vvibration, the cradle, when loosed at all, always fallconnected by links, cranks, and eccentrics, substan- "tially as described. y Also, 'the solid feed-dog, having no pivotal center passing through the same, and operated by an eccen- .tric only, combined with a pivoted guiding piece for varying its throw, substantially as described;

I Also, the revolving shaft, having BllllttlG-Lll'iaing crank at its forward end, and forward of the shuttlerace, and afeediug-dog, arranged between such crank and a stationary hearing or piece, and standing and working in a vertical plane, and having positive motions, only derived from an eccentric onthe shaft.

Also, the swiveling .slide 0, atfixed to and adapted.

Witnesses I. WATTS PAnMnNrEn, THos. J. MCARTHUR.

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