US1864136A - Sewing machine - Google Patents

Description

June 21., -1932. J. A. KNOX n SEWING uAcHINE Filed uay 17. 1929 2 Sheets-Sheet 1 June 2l, 1932. A. KNox 1,864,136

SEWING'MACHINE vFiled Vmy 1v.V 192s 2 sheets-sheet 2 .m u a m M m d QA s M Patented June 2l, i932 UNTED STATES PATENT OFFICE JC'BN A. KNOX, OF NEW YORK, N. Y., ASSIGNOR TO 4THE SINGER MANUFACTURING COH- y PANY, OF ELIZABETH, NEW JERSEY, A CORPORATON F NEW JERSEY SEWING MACHINE Application. led Hay 17,

This invention relates to improvements in sewing machines in which the Work is advanced past the stitch-forming mechanism by a feed-wheel which may be continuously or intermittently rotated fbr this purpose. The

. wheel so as to project beyond one edge of the feed-Wheel and against the needle to an extent causing iaterel deliection of the needle. The usual or a special loop-taker beak guard deflected the point end of the needle in the opposite direction to cause the needle-blade to occupy its proper position for presentation of the needle-thread loop for seizure by the looptaker. during each reciprocation thereof, of course caused frequent needle breakage. Because of the overhanging presser-Wheel there was left a substantial space, adjacent the needle-penetration point, wherein the work was unsup-4 ported and was free to follow the descending and rising needle, thereby inducing the skipping of stitches. Further, in the stitching of very narrow strips, it was difficult to control the feeding of the work because only a small ortion of the width of the'strip was engaged by the feed-Wheel.

the presser-Wheel, preferably having a bev eled work-engaging periphery, is positioned with its lower edge adjacent to the needle suhstan'tially in the same vertical plane as the inner face of the feed-wheel'. The needle is inclined with respect to the path of its vertu cally reciprocating carrying bar so that, in its descent, the needlee'ngages the edge of the presser-wheel whereby the blade of the needle is slightly deflected by a guiding surface provided on thepresser-wheel for this purpose. Consequently, provision is made for not only producing properly connected stitches because of the uniform penetration position of This double bending of the needle,l

ln accordance with the present invention 192,9. Serial Non 363,832.

lferred to cause of skipping of stitches and permitting stitching very close to the ed e of the Work now properly controlled by the eedwheel. 4

rlhe inclination of the needle toward the 'rollerresser is preferably such that the u per en ofthe needle blade is disposed in su stantially a vertical line. through the throatplate needle-aperture. Consequently the slight defiection of the point of the needle by its engagement with the presser-Wheel is such as to bring the entire needle into se id vertical line, whereby the needle is in proper position for presentation of its loop to the loon-taker.

The. throat-plate is preferably formed with a needle-aperture' which opens into the feed- Wheel slot-in the throat-plate and is delined at one side by a web, projecting across said feed-wheel slot under the feed-wheel flange.

This construction provides a closed needleaperture very close to the line of feed to confine more particularly the lower thread and thereby prevent said thread from being car ried between the feed-wheel and a wall of the feed-slot in the throat-plate. The aperture web referred to also serves as a guide for the needle below the work.

In the accompanying drawings, Fig. 1 is a longitudinal section, partly in front elevation, of a sewing machine embodying the pres- -ent improvement. Fig. 2;, is a front end ele.-

vation of the machine shown in Fig. 1, with the bracket-arm face-plate removed. Figi 3 is an enlarged detail view showing the presserand feed-wheels in ak vertical section lengthwise of the cloth-plate and through the throat-plate needle-aperture. Fig. 4 is a top plan view of the throat-plate. Fig. 5 is a longitudinal section of the throat-plate.

The present improvement has been embodied in a` sewing machine constructed substantially as disclosed in the U. S. patent to H. Corrall et alz, No. 1,414,625, May 2, 1922. Referring to the drawings, the machine frame comprises the bedor cloth-plate 1 -carrying the usual slide-plates 2 and 3, and a throat-plate 4 of special construction. Risin from the cloth-plate is the tubular standar 5 of the overhanging bracket-arm 6, ter- 5 minatin in the head 7.

f Suita ly journaled in the bracket-arm is the main or driving shaft 8 carrying at one end the belt-pulley 9 and at its opposite end the crank-disk 10 provided with the crank- -10 pin 11. Embracing the crank-pin 11`is the $9 the frame 16 is substantially parallel with that of the main shaft 8.

In order to impart vibratory movements to the frame 16, it is suitably connected with the crank-arm 18 on one end of the rockshaft 19, which4 is journaled in the bracket- -arm 6 in substantially parallel relationship A. with the main-shaft 8. Secured upon the other end of the rock-shaft 19 is the forked arm 20 straddling the actuating eccentric 21 8G upon the main-shaft 8. I

Adjacent to the eccentric 21, the mainshaft 8 carries the bevel-gear 22 meshing with the similar ear 23 upon the upper end of the vertically isposed, intermediate shaft 35 24 suitably journaled in the machine frame.

At its lower end, the shaft 24 carries the bevelgear 25 driving the similar gear 26 upon the rearward end of, the loop-taker actuating shaft 27 journaled in bearings provided belowr the cloth-plate'fl.` The shaft 27 imparts to the loop-taker 28, in the usual manner, two rotations for each .rotation of the main-shaft 8, said loop-taker carryin a mass of under thread around which need e-thread loops are 45 cast in the formation of lock-stitches.

The shaft 24 also carries the worm-gear 29 vdriving the worm-wheel 30 upon the rearward end of the feed-wheel actuatin shaft 31 y journaled beneath the cloth-plate. t its forl0 ward end, the shaft 31 carries pinions 32, 33 and 34 of di'ierent sizes and constantly in mesh, respectively, with different size spurgears 35, 36 and 374whi'eh may be selectivey keyed to the feed-wheel' shaft 38. The il feed-wheel shaft has its bearing in the frame 39, journaled coaxially with the shaft '31 and adjustable, about itsv journal axis, by means of the screw 40 supported by the .cloth-plate 1. Secured upon the reduced inner end of the 00 shaft 38 is a feed-wheel 41 provided with a, peri heral llange 42 on its side adjacent to' the oop-taker. The feed-wheel referably has la roughened periphery and) projects through a feed-slot 43Yprovided in the throat- .l plate 4, whereby the upper portion ofthe feed-wheel is slightly higher than the upper side of the throatlate.

Opposed to the eed-wheel 41 is apresser-i vpressure upon the work above the free edge of the feed-wheel flange and to barely engage4 the work with the portion of said work-engaging periphery remote from the needle. his construction of the periphery 48 permits an o erator to readily turn the work in the stitc ing of curved or angular seams. The lower edge .of the presser-wheel, on the needle side thereof, is dlsposed in substantially the same vertical plane as the free edge of the feed-wheel flan e 42, while the upper edge of the presser-w eel isspaced from said plane upon its side opposite to the loop-taker Side thereof. The inner side face of the presser- Wheel 44 is provided with an inclined needledeilecting surface 50 terminating in the workengaging face 48 of the presser-wheel.

The lower end of the needle-bar 15 is provided with a socket 51 which is inclined laterally downwardly toward the vertical plane containin the lower edge of the adjacent presser-wheel. Fitted in the socket 51 is the shank 52 of a needle having the usual blade 53, the needle-shank being fixed upon the needle-bar by a securing screw 54.'

The throat-plate 4 is provided with a needle-aperture. 55 which opens at one side thereof into the throat-plate feed-slot v43. The needle-aperture is defined at one side by a web 56 extending from the lower edge of one side of the feed-slot so as to underlie the upper portion of the feed-wheel flange 42. There is thus provided a needle-a rture which is disposed directly at the si e of the feed-wheel,

without losing the advantage of a closed aperture in the handling of the thread. The web 56 also functions as an additional guide for.l

the needle blade 53, the inner or aperture side of said web 56 being in substantially the plane containing the free edge of the feed-wheel ange.

It will be understood, of course, from the 'foregoing description that the needle is pos1 that, while in the tively vibrated laterally so work, said needle partakes of the work-advancing movements of the vfeed-wheel. It will also be apparent that the described construction provides for roperly holding and feeding the work during the formation of the stitches and that the needle is so carefully guided as to insure the production of successively alined stitches which may now be successfully placed very close to the' edge of the work. ,I

Having thus set forth the nature of the invention, what I claim herein is:

1. In a sewing machine, a work-advancin wheel having a point in its edge on 'the needle side thereof in substantially Athe plane containing one edge of the feed-wheel avertically reciprocatolY needle inclined to said plane, means for eilecting the point end of the inclined needle into substantially said plane before the needle enters the work, and

a loop-taker cooperating with the needle in,

the formation of stitches.

2. In a sewing machine, a needle-bar, a needle carried by said bar, a. work-advancin feed-wheel, a presser-wheel o posed to said feed-wheel havin its lower e e on the needle side thereof 1n substantiagly the plane containing one edge of said feed-wheel and having a needle-deflecting surface terminating in said presser-Wheel ed said needle in its raisedposition having its point and its shank at opposite sides of said plane, and a loop-taker cooperating with the needle in the formation of stitches.

3. In a sewing machine, a vertically reciprocatory needle-bar, an inclined needle carried by said bar, a work-advancing feedwheel continuously rotating during the operation of the machine, means for imparting lateral movements to said needle in the line of feed of the work, a presser-wheel opposed to said feed-wheel having a point in its edge on the needle side thereof in substantially the plane containing one edge of the feed-wheel, means for defiecting the point end of the inclined needle into substantially vertical alinement with the upper portion of its blade before the needle-point enters the work, and a loop-taker cooperating with the needle in the formation of stitches.

4. In a sewing machine, a vertically recip- V rocatory needle-bar, a needle carried by said bar in a position inclined to the path of reciprocation of the bar, a work-advancing feed-wheel having a peripheral flange on the needle side thereof, a presser opposed to said feed-wheel having a point in its edge on the needle side thereof in substantially the plane containing the free edge of the feed-wheel ange, and a loop-taker cooperating with'the needle in the formation of stitches.

5. In a sewing machine, a vertically reciprocatory needle-bar, a needle carried by said bar a work-advancing feed-wheel having a peripheral flange on the needle side thereof,- a presser opposed to said feed-wheel, a needleguide disposed under the work-engaging portion of the feed-wheel flange, and a looptaker cooperating with the needle in the formation of stitches. Y

6. In asewing machine, a vertically reciprocatory needle-bar, a needle carried by said bar in a position inclined to the path of reciprocation of the bar, a work-advancin feed-wheel, a presser-wheel opposedto sai feed-wheel having a needle-guiding surface,

a fixed needle-guide independent of the feedwheel below the work-engaging portion thereof, and a loop-taker cooperating with the needle in the formation of stitches.

7.-h In a sewing machine, a vertically reciplrocatory needle-bar, a needle carried by said bar, a. work-advancing feed-wheel having a peripheral flange on the needle side thereof,

a presser-wheel opposed to said feed-wheel having a needle guiding surface t minating at the lower portion of the presser-wheel in substantially the plane containing the free edge of the feed-wheel flange, a needle-guide below the work-engaging portion of the feedwheel flange, and a loop-taker cooperating with the needle in the formation of stitches.

8. In a sewing machine, a vertically reciprocatory needle-bar, a needle carried by said bar, a throat-plate provided with a feed-slot, a work-advancing feed-Wheel having a peripheral flange on the needle side thereof projecting through said feed-slot, a presser op- -posed to said feed-wheel, 'and a needle guide' upon said throat-plate extending under the portion of the feed-wheel flange within the throat-plate feed-slot.

9. In a sewing machine, a vertically reciprocatory needle-bar, a needle carried by said bar, a throat-plate provided with a feed-slot, a work-advancing feed-wheel having a peripheral fiange on the needle side thereof projecting through said feed-slot, a presser opposed to said feed-wheel, and a needle-guide upon said throat-plate extending under the portion of the feed-wheel fiange within the throatlate feed-slot and presenting a needle gui ing surface substantially in the plane containing the free edge of said flange.

10. In a sewing machine, a reciprocatory needle-bar, a needle carried by said ba'r, a feed-wheel having a peripheral fiange on the needle side thereof, a presser opposed to said feed-wheel, a throat-plate having a feedwheel slot and provided with a needle aperture defined at one side by a web underlying the portion of the feed-wheel flange within the throat-plate feed-slot, and a loop-taker cooperating with the needle in the formation of stitches.

11. In a sewing machine, a reciprocatory needle, a throat-plate having a feed-slot and provided with a needle-a erture defined at one side by a web dispose between the vertical planes through the sides of said feedslot, and a feeding element operating through the feed-slot having a work-engaging surface overlying said web.

In testimony whereof, I have signed my name to this specification.

JOHN A. KNOX.

Images