US564985A - Island - Google Patents

Description

(No Model.) 2 SheetsSheet 1.

A. B. FOWLER & G. E. WARREN SEWING MACHINE.

No. 564,985. Patented Aug. 4, 1896.

X/ih ssEs -(N0 Model.) 2 Sheets-Sheet 2.

A. B. FOWLERSv G. E.- WARREN, SEWING MACHINE.

No. 564,985. nt d g- 4, 1896.

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UNITED STATES PATENT EErcE.

ALFRED l3. FOXVLER AND GEORGE E. NVARREN, OF .PAlV'JUC-KET, RHODE ISLAND, ASSIGNORS TO THE LINCOLN SEVING MACHINE COMPANY, OF EXETER, NEV HAMPSHIRE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 564,985, dated August 4, 1896.

Application filed May 1, 1895. Serial No. 547,775. (No model-l To all whom it may concern: ondly, pulling off thread from the tension,

Be it known that we, ALFRED B. FOWLER and thirdly, providing means for forming a and GEORGE E. \VARREN, of Pawtucket, in bight of thread between the material and the the county of Providence and State of Rhode throat of the needle, all of which will be well Island, have invented a new and useful Imunderstood by those skilled in the art, espemovement in Means for Handling Thread in cially upon referring to the following patents: Hook-Needle Chain-Stitch Sewing-Machines, No. $745,936, to Campbell, dated December 20, of which the following is a specification, refer 1887; Nos. 412,703 and 412,704, to French at once beinghad to the accompanying drawings, at, dated October S, 1889 No. 473,870, to

ID in which French 615 (LL, dated April 26, 1892, and No.

Figure l is an elevation of so much of a 533,639, to Eppler, dated February 5, 1895. sewing-machine as is requisite to illustrate The object of our invention is to pull 01% our invention. Fig. 2 is an elevation of a dethread from the tension while maintaining the vice for taking up slack thread. Fig. 3 is a supply of thread in the loop already drawn,

I 5 sectional elevation of apull-ofi device. Fig. so that when the needle is drawn back the l.- is an elevation showing the main parts in anthread for the new loop is provided partly by other position from that shown in Fig. 1. the thread in the preceding loop and partly In hook-needle chain-stitch sewing-maby the thread drawn from the tension by the chines the thread is ordinarily drawn taut by pull-off mechanism.

20 the back stroke of the needle; that is, when In the drawings, A represents a tension dethehook-needle has completed its back stroke vice of well-known construction, through the thread is taut on one side of the material which the thread passes from any proper in the form of aloop held by the needle-throat, thread supply over a guidet-ruck b, which is and on the other side of the material the preferably adjustable, as shown, and back of 25 thread is taut through the looper and other the pull-off truck B through the brake D d, 7 5

thread-guides back to the tension. As the shown as applied by its spring cl, acting on needle is moved toward the material the loop the moving member D when that member is of thread in its throat is slackened, and when released from stop (1 on the arm Z), which the needle has penetrated the material the carries pull-01f truck B. Arm h'is adjust-ably loop lies loosely about the shank of the needle, connected to lever 13 which is oscillated by its and the looper then lays thethread in the hook cam-roll and cam 12 as clearly shown in Figs.

of the needle, so that when the looper has op- 1 and l.

erated the thread on one side of the material From the brake D (Z the thread extends is in the form of a slack loop about the needleover guide-truck b and thence under the 3 5 shank, and when the needle is drawn back it slack-taking truck F, which is on arm f, con- 8 5 draws a new loop through the material and trolled by the light spring f, and which acts through the preceding loop, which is thus in connection with truck Z2 on one side of it tightened and thereby furnishes a part of the and truck b on the other side of it to take up thread for the succeeding loop, the rest of the any slack in the thread, for, as will be seen 0 thread being drawn from the tension; and all in Fig. 1, slack-takin g truck F is held against the thread which the needle draws from the the pull of the light springf when the thread tension renders in the throat of the needle is taut, but in case of any slack the springf under the strain due to the tension, which is will cause truck F to take it up. objectionable, especially in machines for sew- The pull-off truck B, its arm b, its lever b 45 ing turn shoes and welts. This objection has together with the moving member D of the 5 long been well known to all skilled in the art, brake, are best shown in Figs. 1 and -;t, and but heretofore all attempts to overcome it Fig.3,which also illustrates theways in which have been based upon the plan of first drawthe headed journal of the pull-off truck B ing back the thread, so as to leave no supply slides.

50 of thread in one loop for the next loop; sec- The slack-taking truck F, its arm f and spring f, together with the looper and the guide-truck 12 are best shown in Fig. 2.

The parts not lettered are too well known to require description.

In Fig. 1 the needle is at the end of its back stroke to set the stitch by tightening the thread from the hook of the needle through the between substance, through the looper, over truck 19 under truck F, over truck 19 through the open brake D d, past pull-ofi. truck B, and guide-truck b to the tension A.

In Fig. 4 the thread is held by the brake D d and the pull-off truck B has just commenced to pull oii thread through the tension, while the looper has laid the thread in the hook of the needle and the slack-takin g truck F has taken up the slack. The pull-off truck B completes its back stroke, pulling off thread from the tension, but not taking up the thread, for the brake D d prevents pull-off truck B from acting as a take-up, the main object being to pull off thread from the tension without pulling the thread back, so as to leave a thread supply on both sides of theneedle, the thread in the preceding loop being the supply for one side of the needle and the thread given up by the pull-off being the supply for the other side of the needle. As the needle draws a new loop of thread through the material and the preceding loop the pull-off truck 13 makes its forward stroke supplying thread for the new loop, and the old loop then lying slack about the shank of the needle also supplies thread for the new loop, the result being not only that we dispense wholly with the bight-forining mechanism essential in all other hook-needle machines with a pull-01f mechanism, but also materially reduce the rendering of the thread to and fro.

lVhile we show a thread-brake for preventing the truck B from acting as a take-up, it will be obvious that the essential matter is that the thread shall be pulled off from the tension without being so taken up or pulled and like the older class of hook-needle sewing-machines in that it maintains in each loop a thread supply for the next loop, yet differs from both these classes in mode of operation as well as in result.

hat we claim as our invention is 1. In a hook-needle chain-stitch sewing-m achine the combination of a tension; a looper; a hook-needle; which draws a loop of thread through a preceding loop and tightens the stitch by its loop-drawing stroke; a pull-off mechanism between the tension and the needle; and means to hold the thread on the needle side of the pull-01f mechanism and thereby prevent that mechanism from acting as a takeup and compel it to draw thread from the tension; all organized and operating to form and tighten the stitch substantially as described.

2. In a hook-needle chain-stitch sewing-machine the combination of a tension; a looper; ahook-needle; which draws a loop of thread through a preceding loop and tightens the stitch by its loop-drawing stroke; a pull-oil mechanism between the tension and the needle; and a thread-brake between the pull-off mechanism and the needle; all organized and operating to form and tighten the stitch substantially as described.

ALFRED B. FOWLER. GEORGE WARREN. Vitnesses:

M. E. DoLLoFF, A. L. Goonmc.

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