US184860A - Improvement in sewing-machines - Google Patents

Description

I zsheetvsheeti j L. GRISWOLD.

SEWING-MACHINE. No.184,860. Patented Nov. 28, 1876.

NFETERS, PHOTO-LITHOGRAFHER, WASHXNGTON, D c,

2 Sheets-Sheet 2.

1..c+1=:svvo1.n. SEWING-MACHINE.

Patented N.ov.28,1876.

ITO-184,860.

NFETERS. PHOTD LITHOGRAPHER, WASHINGTON, D Q

me STATES PATENT IMPR OVEMENT IN SEWING-MACHINES.

Specification forming part of Letters PatentNo. 184,860, dated November 28, 1876; application filed May 1, 1876.

I To all whom it may concern:

Be it known that I, LEO GRIS'WOLD, of J ohnstown, in the county of Fulton and State of New York, have invented a Sewing-Machine, of which the following is a specifica. tion:

The object of my invention is to so construct sewing machines having vibrating needlebars, neadle-bar guides, and their equivalents,

Figure 1 is an inverted plan view of my.

invention, showing the triple crank shaft and connecting-rods which actuate the shuttle andfeed devices. Fig; 2 is an end sectional view, and Fig. 3 exhibits a side sectional elevation, of the needle-bar head, to which my invention is applied. Figs. 4 and 5 are elevations of the universal-jointed connecting-rod which actuates the needle-bar vertically. Fig. 6 is a plan view of the device which imparts a zigzag motion to the neodle-bar. By simply turning the milled thumbscrew the needle-bar may be held in a fixed lateral position as long a time as required.

A represents the bed-plate of my sewingmachine, and A the arm-head, which is fitted to receive the needle-bar b and feed presserfoot 0, and their respective appendages. d is fiy-wheel, which is affixed to the triple crank-shaft d. e is a connecting-rod, one end of which is fitted to a crank on shaft d, and the opposite end imparts the requisite motion to the shuttle F, in the usual manner. A connecting-rod is also fitted to crank shown at 9, Fig. 1, which imparts an oscillatory motion to the shaft h, which is fitted to oscillate in the horizontal bearings of the arm and head A. A crank, 13, is secured to the oscillating shaft 71., and said crank has a pin, 6 which is inserted into one piece, k, of the universal-joint: ed connecting-rod. (Shown at k k k Figs.

2, 3, 4, and 5.) The parts is k k are connected together, and so fitted in the joints by means of rivets, screws, pins, or the like, that the lower joint k which is fitted to the pin 1' affixed to the vibrating needle-bar b, may readily accommodate itself to the alternate mo-- tion and vibration of the said needle-bar. The vibrations of the crank tare shownby dotted arc and radial'lines in Fig. 2 at 11 The ne'edle-bar b is fitted to slide vertically in a sleeve .or guide, L, which, in turn, is fitted in the to keep the guide L at all times against the lever-plate 0, which rests on the fulcrumscrew P. (Shown in Figs. 3 and 6.) The leverplate is provided with steady or guide pins q g, which enter holes in the face-plate of the head A, as will be readily inferred by reference to Figs. 2 and 3. The opposite end of the lever-plate 0 rests on the intermitting rotary sleeve R, which is provided with eight teeth, 8, or any suitable number, and half that number of angles or sides. Now, a pawl or click, T, is pivoted to the stud-pin or bolt a near its center, and engages with a crank-pin, 2', affixed to the crank i, as shown in Figs. 2 and 3, near its upper end. The lower or opposite end is brought in contact with the ratchet or toothed wheel 8, and rotates the same intermittently at every return stroke of the needle-bar, as will be readily inferred from a glance at the drawing. Each stroke of the pawl moves the ratchet one tooth; therefore, it will be observed, that alternately an angle and a flat side of the sleeve R are brought in contact with the lever-plate 0; the screw P is withdrawn from contact with the plate 0, the angles and sides of the sleeve R do not move or actuate the said plate, consequently the guide L will convey the needlebar in one fixed point; but, if the fulcrumscrew P' be forced against the plate 0, the guide L will be made to vibrate at each return stroke of the needle-bar b, by the alternate action of the vquadrangular surfaces and angles coming in contact with the lever-plate o,

FFICE.

Now, when I measure, the spring nl same is in contact with the fabric while it is being sewed, or during the formation of the stitch, but only when the needle is withdrawn "*fIOlIl the work does the same make a step to served that the needle-bar 1) steps or-vibratesi in a lateral directionwith respect to the 1110- -tion of the feed wh sewed;

alternately compressing. and

-releasin2,"irf a The sleeve B may be fitted so as-turn very readily on the feedpresser-bar c, and I prefer; this manner of operation in lieu of other expensive devices to retain the sleeve R in ,posi- I J L The pawl T is readily brought in contact with the ratchet s by means of the spring '0 on y the pin or screw 11., as shown in Fig. 3.

The vibrations of the needle are parallel with the shuttle course or race, for the obvious reason that the shuttle may at alltimes pass through the loops formed by the upper thread. the needle has no lateral motionwhile the to the right or left, as already described.

I disclaim the use of a swinging needle-ban It will also be ob-:

It will also be readily inferred that I claim as my inventionguide L, vibrating crank 13, pawl T, provided with a slot in its upper end, ratchet s, sleeve R, plate 0, screw P, and spring n, wherebythe proper vibratory motion is imparted to the said needle-bar, and the amount of such motion is adjusted as and for the purpose set forth.

2. In combination with a pivoted needle bar guide, L, plate 0, screw P, ratchet s, sleeve R, and 'spring (a, the universal-jointed conmeeting-rod 70 70 70 and vibrating crank 11, substantially as and for the purpose set forth.

3. The combination of the universal-jointed connecting-rod 7c k k, vibrating I crank 11, needle-bar guide L, 'and needle'har b, as set forth.

4. In combination with the quadrangular sleeve R, plate 0, screw P, and spring a, the pivoted needle-bar guide L, as set forth.

5. In combination with the needle-barguide L, pivoted as described, the spring a, leverplate 0, vfulcrum-screw P, universal -jointed connecting-rod k la la, and vibrating crank '5, operating substantially in the manner and for the purpose set forth.

LEO GRISWOLD.

Witnesses:

J. W. LATGHER',

ich carries the fabric to be} D. MCMARTIN.

1. In combination, the pivoted needle-bar 1

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