US247312A - Ijjomvcl - Google Patents

Description

2 Sheets-Sheet 1.

(Model) D. OOLES.

SEWING MACHINE.

No. 247,312. Patented Sept. 20,1881.

'2 Sheets-Sheet 2.

Modal D. OOLES.

SEWING MACHINE.

Patented Se t. 20, 1881f 5 L 7; L017 @auizzyfl. Cm

UNITED STATES PATENT Drrrcn.

DAVID H. CODES, OF NEW YORK, N. Y.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 247,312, dated September 20, 1881.

Application filed March 21, 1881. (ModeL) To all whom it may concern Be it known that I, DAVID H. COLES, of the 7 city, county, and State of New York, have invented new and useful Improvements in Sewing-Machines, of which the following is a specificationv This invention relates to the class of lockstitch sewing-machines; andit consists in im simplicity and economy of construction with a direct and positive action and minimum of friction of the moving parts, which constitutes a cheap, durable, and light-running sewing-machine.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a front elevation of the machine. Fig. 2 is a plan view of the under side of the same. Fig. 3 is a sectional view through the line a; :0 of Fig. 2, and Fig. 4 is an elevation of the feed-dog.

In the drawings, T represents the table of the machine.

A is a stationary curved arm,of usual shape, to which are attached the parts by which mo- .tion is transmitted from the driving-shaft to the needle-bar.

B is a pitman, attached to a crank, a, on a cross-shaft, O, which is connected to the main shaft D by gears E E.

F is a bell-crank pivoted to the arm A, to one arm of which is attached the pitman B, while to its other arm is attached the connectingrod G.

H is a toggle-joint located behind the needle- 7 bar I, havingits upper link pivoted to the arm verted into a horizontal reciprocating movement of the connecting-rod G, and both the pitman and the rod Gr move in substantially right lines with their normal directions.

By connecting the rod G to the toggle-joint of the links of the toggle.

near the middle of its upper link, substantially as shown, the requisite vertical movement is given to the needle-bar by a much less movement of the rod G than would be required provided it was connected at or near thejunction This arrangement, while it permits the use of a less eccentric by which the pitman is operated and less friction of the driving mechanism generally, does not materially detract from the force which the rod G is adapted to impart to the needle-bar, for the reason that at the moment the needle pierces the cloth the toggle-joint is nearly perpendicular and capable ofexertin g its full downward force.

It is an important feature in this construc tion that the rod G shouldbe connected to the upper link of the toggle-joint at a point sufficiently forward of a vertical line passing through the upper and lower pivots of said 1ink-that is, on the side of said line most remote from the bell-crank ]3-so that the backward movement of the toggle-joint from this vertical position will lift the needle free of the cloth, while its forward movement from such vertical position will slightly raise the needle for the purpose of forming the loop, and its backward movement to the same position will give the required slack of thread for the passage of the shuttle through the loop, which takes place during the time the pivoted connection of the rod G with the upper link is forward of or at such vertical line. The upper link is preferably curved, as shown in Fig. 1 of the drawings, whereby the pivoted connections can be related to each other, as above described, with the greatest economy of material for the strength required. This special connection of the rod G to the toggle-joint constitutes the main feature of difference be-' I from the method of connection shown in said Patent No. 22,160 that the forward vibration of the toggle-joint and connecting-rod, after they have passed the perpendicular, is largely outside the limits which would otherwise be required in the machine; also, that the case inclosing these moving parts, by reason of its extension, will be unsightly, and will impede the operators view of the work after it has passed through the machine, and will seriously interfere with the attachment to the face-plate of many of the removable devices demanded in modern machines.

It is readily seen that the parts connecting the shaft with the needle-bar are very simple in their construction, being plain pieces of metal with pivoted connections.

The take-up mechanism of this machine is exceedingly simple, and consists of the combination of thread-eyes b b, fixed in the stationary bar A, and a thread-eye, c, on the vibrating rod G. These eyes are so located relatively to each other that when the needle-bar is at its extreme descent and the shuttle is passing through the loop they will be in, or nearly in, a perpendicular line, thereby giving the required slack to the thread; but when the needle-bar is raised by the backward movement of the connecting-rod G the eye 0 and the thread will take the position shown by dotted lines in Fig. 1 of the drawings, and effect a positive take-up of the stitch without the aid of any of the usual devices for this purpose.

The feed of this machine is the usual fourmotioned feed, and the novelty consists in the combination of devices by which it is produced.

. I ,i K I bar.

J represents a feed-dog, which works in a frame or case, K, secured to the under side of the table. This feed-dog is seen in elevation in Fig. 4 of the drawings, and is arranged to slide back and forth upon a pin, (1, projecting from the wall of the caseK into a slotin the rear part of the dog. The dog is so arranged in its case that the desired upward and downward movement of the feeding-teeth is permitted.

L is a bar extending lengthwise of the machine, beneath the table, having one of its ends connected with an eccentric on the cross-shaft U, which gives to the bar a longitudinal reciprocation, and causes this end to be slightly raised during each revolution of the shaft. The opposite end of the bar L is slotted and slides on the stationary but adjustable pin e. There is secured to the bar L, opposite the feed-dog, awedge, f, having its inclined or wedge-shaped face toward the throat of the machine.

M is a longitudinal bar with a pivoted point, g,"and made adjustable by a set-screw, it, worked through a slot in the table, near one end of the The opposite end of this bar passes through the feed-dog J and its case K, and has one of its faces, 13, inclined to conform to the face of the wedge f, which slides forward and backwardin contact with it. j is a spring,

having one of its ends secured to the table and its opposite end attached to the feed-dog, and acts by its elasticity to give to the feeddog its required downward and backward movement.

It is seen that the bar M, adjacent the feeddog, has a lateral movement, by which the requisite forward motion is imparted to the feed-dog, and that the object of the pivoted joint 9 is to permit this lateral movement with the least expenditure of power. The bar M might be of thin untempered steel'or other elastic material and the pivoted joint be dispensed ,with; but in such case it would be liable to lose its elasticity and to become granulated by the continual vibrations to which it would be subjected. By the above-described construction the inclines j and i are in constant contact by the force of the spring j, and thus obviate any noise which might be occasioned by the impact of the parts by which the feeddog is to be operated were the construction different.

The operation of the feeding devices is as follows: The wedge f, when carried forward by the movement of the bar L, slides over the adjacent inclined face i on the end of the bar M, and forces it toward the throat of the ma chine, this bar turning upon its pivoted point 9. As the side of the bar M opposite its inclined face has a bearing against a shoulder or wall of the feed-dog, this dog is also forced in the same forward direction, and the range of this forward movement of the dog is controlled by adjusting the bar M longitudinally by the setscrew h, whereby its inclined face i shall be more or less acted upon by the wedgef, as may be desired. The feed-dog is thrown downward and backward by the force of the spring j, and is raised by the upward movement of the bar L, which holds it in that position during its forward movement. The extent of its upward movement is regulated by the adjustable pin 6. It is observed that this feed is produced by giving the desired movement to the parts by means of a simple eccentric on the shaft and a spring connected to the feed-dog, instead of the usual construction of a sharp-angled cam and other objectionable devices, with their attendant wear and friction.

What is claimed as new is- 1. The combination, in a sewing-machine, of a toggle-joint, a needle-bar, and a reciprocatin g rod connected with the driving-shaft, the attachment of the reciprocating rod to the upper link of the toggle-joint being forward of a vertical line passing through the upper and lower pivots of said link, substantially as and for the purpose set forth.

2. In a sewing-machine, a thread-eye located on a reciprocating rod connecting the drivingshaft with the needle-bar, in combination with thread-eyes on either side of such rod, so that the vibration of the rod will effect'a positive take-up of the needle thread to tighten the stitch, substantially as set forth.

3. In a sewing-machine, a pivoted 'adjustthe rod L, for the purpose of producinga fourable rod, M, provided with an inclined face, 13, motioned feed in a sewing-machine, substanin combination with a reciprocating Wedge, tially as set forth.

whereby an adjustable forward movement is DAVID H. OOLES. 5 given to the feed-dog. Witnesses:

4. The combination of a rod, M,with inclined ROBT. H. DUNCAN, face 2', a reciprocating wedge, f, a spring, j, and BENJ. A. SMITH.

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