US313705A - barsby - Google Patents

Description

(No-Model.) 2 Sheets-Sheet. 1. W. BARSBY.

LOCK STITCH SEWING MACHINE;

No. 313,705. Patented MaL IO, 1885.

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(No Model.) 2 Sheets-She6t 2" W. BARSBY.

LOCK STITCH SEWING MACHINE. N0. 313,705. Patented Mar. 10, 1885.

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LOCK-STITCH SEWING-MACHINE.

JxlZCEl-ICATIGN forming part of Letters Patent No. 313,705, dated March 10, 1885.

Application filed December 5, 1884. (N0 model.)

To ctZZ whom it may concern:

Beit known that I, WILLIAM BARSBY, of Kings Heath, in the county -of Vorcester, England, a subject of the Queen of Great Britain, have invented Improvements in Look- Stitch Sewing-Machines, (for which I have obtained a patent in Great Britain, No. 2,529, bearing date February 1, 1884,) of which the following is a specification.

My invention has for its object improvements in lock-stitch sewing-machines; but is more especially applicable to those machines designed for sewing heavy materialsnch, for instance, as leather-and where there is considerable difficulty in piercing the material from one side, or where, because of the several thicknesses of material to be sewed, the bulging at the under side would be considerable when pierced from the top only. I am also able to insure great regularity of work, because there is less strain upon the weak parts of the machine, and therefore the work is better in quality, without leaving the marks of the feed ingpiece, which is usually the case.

The invention belongs particularly to that type of wax-thread sewing-machines which employ an awl or piercer and a needle, the awl being so arranged 011 the bed-plate as to feed the material to be sewed along said table alter the performance of each piercing operation.

The invention consists in a novel construc tion and arrangement of said awl and feeding device, and in the means for imparting a vertical and horizontal movement to the same, all as will be hereinafter more fully described, and then set forth in the claims.

In the drawings, Figure 1 represents in front elevation, Fig. 2 in side elevation, and Fig. 3 in plan, a portion of a lock-stitch sewing-machine containing my improvements. Fig. at is a plan of the shuttle-box of the machine. Fig. 5 represents separately the piercer and feeder of the machine, made preferably of steel, and Fig. 6 a modification of the said piercer and feeder, the said Figs. 5 and 6 being drawn of the full size. Figs. 7 and.8 represent a modified construction of parts for operating the awl and feeding device.

The same letters indicate the same parts in the several figures of the drawings, wherein I have illustrated so much of a wax-thread sewing-machine as is necessary to show the adaptation of my improvements.

a is theiixed base of the machine. b is the shuttle-box. c is the needle, and d the press ure-foot for holding down the material during the sewing operation. e is the plate piercer and feeder, made according to my invention, the said plate being of such thickness that it will move freely in the needle-groovef, made in the needle-plate, and the shuttle-box I) for the passage of the needle. (See Figs. 1 and 4.) The said piercer e pierces the material from the under side, and acts also as a feeder, as hereinafter explained. The shape of the piercer e is best seen in Figs. 2 and 5, and from an examination of the said figures it will be seen that the piercer has a sharp or pointed end, and owing to its great depth is rigid up to its working-point. The plate piercer and feedere is fixed in the slotted end of the holder 9 by the screw h. This holder is fitted in the vertical carrier i, in which it is capable of rising and falling. The said carrier 2' is connected to the dovetail plate r1 capable of a horizontal sliding motion in the baseplate a of the machine. (See Fig. 1.) The said dovetail plate i works between the stop-screws (See Figs. 2 and 3.) The length of stitch is regulated by the screw t in front of the machine. The rising and falling motion of the piercer and feeder c is effected by the lever 70, pivoted at one end, Z, to the fixed upright at on the sliding plate 1'", and connected at its other end by the pin a to the sliding holder 9, supporting the piercer e. The end k of the lever la is slotted, to permit it to work upon the pin a. The rocking motion of the lever upon the center Z, by which it communicates a rising and falling motion to the holder 9, is effected by the cams p and g on the driving-shaft s of the machine, the said cams working in the box or slotted part k of the leverw The rising motion of the lever is effected by the cam q and the descending motion by the cam p. The advance or feeding motion of the piercer, so as to feed forward the material being sewed, iseftected by the cam r on the shaft 8 acting against the bearingstop ton the upright m of the base-plate t the return motion of the said base and parts carried by it being effected by the coiled IOO - fixed base a of the machine.

spring a, one end of which is connected to the dovetail plate 13", and the other end to the The feeding stop tis made adjustable to compensate for wear in the cam r, and to insure that the piercer e at the end of its feeding movement shall be exactly under the needle. The stop it is shown withdrawn beyond the range of the camr in order that the cams may be more readily seen. The center l is capable of a slight vertical adjustment in the upright m,

to enable the piercer e to pierce the material to a greater or less extent, as maybe desired. Aslot in the upright m, and a nut on the center Z, may be resorted to for giving the vertical adjustment to the piercer.

By the arrangement of parts described the piercer 6, when situated behind or on one side of the central position of the needle 0, rises and pierces from the under side the leather or material being sewed. While the piercer is inserted in the leather or material its feeding or horizontal sliding motion is effected, as hereinbefore described, and the said piercer is thereby carried exactly underneath or in a line with the needle 0, as represented in Fig. 2. After having pierced and fed the material to the position last described, the piercer first makes its descending motion, so as to remove it from the material, and afterward makes its back sliding motion to thelength ofone stitch that is, to its original position. The needle 0, descending from the upper side of the material, passes through the hole formed by the piercer e. As the needle makes its ascending motion the thread is formed into a loop on the under side of the material, and the shuttle being shot through the looped thread a lock-stitch is formed in'the ordinary way. The pressurefoot 01 is raised while the piercer e is feeding forward the material, so as to prevent any undue strain upon thesaid piercer, said pressurefoot being raised in any preferred manner.

The piercer and feeder 0 may be connected directly to the actuating-lever, instead of to the holder g, and the said actuating-lever be worked by the modification of parts represented in side elevation in Fig. 7 and back elethe frame of the machine, and works upon the pin 2, so that the said lever is free tomove both vertically and horizontally at its jointed end. The upward movement of the lever 2 is effected by the cam 3, and its forward horizontal motion by the cam 4. The return backward and downward motions of the lever are produced by the action of the spring 5, one arm of which bears against the projecting part 2 on the lever 2, and the other arm bears against the fixed part 1 of the machine. b is the shuttle-box, and f the needle-groove.

' Instead of making the under piercer and feeder of a fiat plate pointed at its acting end, the said under piercer and feeder may be made of cylindrical or other shaped steel or other wire, as illustrated in Fig. 6, the acting end of this piercer being pointed. The wire from which the piercer and feeder, Fig. .6, is made is of such a thickness that the said piercer and feeder will move freely in the needlo-groovef. The said piercer is marked 6, and is fixed in the holder 9 by the screw h, as described with respect to the plate piercer and feeder.

My improved piercer and feeder may be applied to lock-stitch sewing-machines of different construction from those described and rep resented in the drawings.

I am aware that the awl of a wax-thread sewing-machine has heretofore been combined with mechanism to reciprocate the awl both vertically and horizontally, and such, therefore, I do not broadly claim.

Having now particularly described and ascertained the nature of my said invention and.

in what manner the same is to be performed, I declare that what 1 claim is- 1. The combination, in a sewing-machine, of

the shuttle-box I), having the needle-plate provided with the vertical needle-groovef,the awl e, nioving in said groove, the horizontally-reciprocating lever pivoted to swing upward and downward, and connected with the awl, the

cams, and a spring for imparting the said reciprocating and swinging movements to the awl, and the needle 0, arranged above the shuttle-box, substantially as described.

2. The combination, in a sewing-machine, of the shuttle-box b, the needle 0, arranged above the same, the awl e, the horizontally reciprocating lever connected with the awl, and arranged. below the shuttle-box, and piv oted to swing upward and downward, and the cams, and a spring for imparting the said re ciprocating and swinging movements to the lever, substantially as described.

3. In a lock-stitch sewing-machine, the combination of the horizontally-movable slideplate, the oscillating lever, the vertical post, and movable awl-carrier fitted therein, the cam mechanism for reciprocating the slide plate and operating the awl-carrier, and the spring for returning the slid e-plate to its normal position, with the grooved shuttlebox and the needle arranged above the same, substantially as described.

' XVILLIAM BARSBY. [L. s.]

Witnesses:

GEORGE SHAW, RICHARD SKERRETT.

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