US283095A - garland - Google Patents

Description

(No Model.)

BAG SEWING MAGHINE.

No. 283,095. "Patented'l-ug- 1491883.

` Flai -WITNEESEE yIo `To a/ZZ whom` 7315. may concern:`

. NITED STATES J'PATENTOFFCE@ i HOWARD P. GARLAND, or sAN QUENTIN, CALIFORNIA. 4

` BAG-SEWING MACHINE.

sinterr IcAjmoN formingpart of Letters Patent No; 83,095, dated August 14,1883.

` l Application filed January 7, 1883. `(No model.)

Be it known` that I,"HOWARD PRATT 'GAR- LAND, a citizen of the United States, residing `1 at San Quentiinin the county of `Marin and State of California, have invented certain; new and useful Improvements in SewingMachines for Sewing Bags," of p which the following is a specification. -f

My invention relatesv -to improvements in sewing-machines, chiefly designed for sewing thick or heavy materials with an overhand or winding-stitch; and it consists more particul larly in certain improvements uponthe sewfao ing-machine for which I have obtained a patent in Great Britain 8, 1876.

I-Ieretofore it has been `found that, where op! erating a machine forfsewing bags and other thick or heavy `material employing a spiral needle and supported by a series of threaded cylindrical rollers, or cylinders between which thesaid needle .rests,lwl`1en the point of the needle meetswith" any obstruction and the rollers continue to revolve, the needle will be forced backward until it meets the heel or lend plate, whenitslfurther Aprogress will be stopped, and as thefscrew-threads of the roll- L through the small endof the rollers.

ers prevent the needlefrom being compressed upon itself,the increased resistance or' pressure causes the needle Ato break, to `the great damage ofthe machine and fabric being sewed; hence the object of "my invention is to avoid `this difliculty and `to `provide an improved means for operatingthe spiral needle, which object I accomplishby means of the device illustrated in the accompanying drawings, in

Figure lis aplan or top viewfpartly `broken away, of a baglsewing machine embodying my ing the casing.

p p p designate like Similar letters of reference are used to parts throughout the several vlews.

The operating-rollers are supported by a No. 3, 538, dated September l suitable bedlplate, A, which is to be firmly secured upon a table or "other support. The helical or spiral needle B is made of steel, the coil 'gradually Vincreasing from a small diameter at the heel to alarge diameter at the point or eye.

gether with the roller which is j ournaled therein, as shownin Fig; 5, may be turned back or opened, so that access may be had to the spiral needle, and the latter may be taken out and replaced. p l

The rear portion of the case G is provided with" two screw handwheels, H II, "for the purpose of clamping the said casing and its roller down upon and over the spiral needle, and it is also provided withtwo set-bolts, I I, for regulating the pressure of the upper roller upon the needle. The stems Aof the handwheels are each made solid, with an enlarged portion, that rests upon the upper face of the casing, as shown'in Figs. 3, 4, and 6. I The these stems is screw-threaded, as shown at b, so as to screw into the bed-plate, while the intermediate portion, c, that passes through the casing, is left plain. The set-bolts I I are threaded, and pass through the casing, and rest lupon the upper surface of the bedr-plate, or upon lugs d d projecting therefrom, as shown. I

ends of the casing, as shown in Fig. 5, and when the casing is thrown over or down upon the needle the hand-wheelis turned down, so as to cause the upper drive-rollte press upon the needle, and the set-bolt I is also screwed `down until its point touches the top of the lug d on the bed-plate. If it be foundthat the tension or pressure produced by the handwheel upon the needle is not sufficient, the set- The rollers C, D, and E, which support and bed-plate in such a manner that the case, to-

lower end of the contracted portion of each of The upper drive-roller is journaled in the bolt is slackened and the outer end of the shell or casing allowed to descend lower. Should it be too great, the set-bolt is turned down, which will raise up the outer end of the casing. It is not' absolutely necessary that the set-bolts be employed, as wedges or blocks would answer the same purpose.

- The drive rollers or cylinders are placed in position 4within the machine, with their large endsat the right-hand side or at the heel of the needle, and the central line or axis of each roller is placed parallel with those of the other two. The spindles or gudgeons of each of these rollers are provided with a pinion geared with suitable driving gear-wheels mounted on a shaft provided with loose and fast pulleys, and these rollers are so placed with reference to each other that their centers form the, three corners of an isosceles triangle, the center of the upper roller being the apex; and within the space left between the' peripheries of the rollers I place the spiral needle B. The needle lies in a reversed position, with its small end or heel between the large ends of the rollers and its large end or pointl between the small ends of the rollers. The threaded portion of the drive-rollers is made somewhat longer than the length of the spiral needle,

`and this excess of length is left at the heel end of the needle, for a reason to be hereinafter explained.

The screw-thread on the rollers is formed in i the opposite direction to, but with the same pitch as, the thread or spiralof the needle, so that the grooves in the rollers form seats for the needle and keep it always at a uniform distance from theend of the machine. The thread of the rollers working in the needle also maintains the uniformity of the pitch of the thread of the needle throughout its entire length, and the gearing of the said rollers with one central shaft insures the revolutionA of all of them in one direction and their driving the operator. At the forward or eye end of the needle, and working in the same, I arrange a nose-piece or slotted guide, J, which acts as a guide to the fabric entering and being sewed by the machine.

' It will be readily seen from the that the needle cannot work forward, because the pressure will be equal throughoutthe entire length of the needle; but when the eye or. point of the needle strikes or meets with any obstructions such as are liable to be met with in sewing very heavy, coarse, or badly-woven fabrics, the needle will work backward toward the heel end of the rollers with a yielding but at the same time a resisting pressure until the pressure at the point of resistance has become sufficiently great to force the needle-point through the fabric, when the expansive power of the coiled needle will cause its eye end to move forward and resume its original position.

For sewing very light fabrics the spirals or threads upon the tapering rollers may be dispensed with and the rollers made perfectly plain, and the spiral needle may be either grooved or solid.

Having thus described my invention, 4what I claim, and desire to secure by Letters Patent, 1s-

In a sewing-machine adapted for sewing an overhand stitch, the combination of the tapering spiralY needle B and the tapering sup- 7 5 porting and driving rollers G, D, and E, when combined, arranged, and operating substantially in the manner and for the purpose set forth. y

In testimony that I claim the foregoing I 8o have hereunto set my hand and seal.

HQWARD PRATT GARLAND. EL. s]

Witnesses:

WILMER BRADFORD,

GHAs. E. KELLY.

foregoing 5o Y

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