US800198A - Needle-thread-controlling device for sewing-machines. - Google Patents

Description

No. 800,198. 'PATENTED SEPT. 26, 1905.

R. G. WOODWARD. NEEDLE THREADGONTROLLING DEVICE FOR SEWING MACHINES.

- APPLIOATION BILBI) JULY 23,1902.

' 2 SHEETS-SHEET 1.

5114432" Coz.

No. 800,198. 7 PATENTED SEPT. 26, 1905.

- E. G. WOODWARD. NEEDLE THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

APPLICATION FILED JULY 23, 190 2.

2 SHEETS-SHEET Z.

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UNITED STATES PATENT OFFICE.

RUSSEL G. WOODWARD, OF WAUKEGAN, ILLINOIS, ASSIGNOR TO UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS, A COR- PORATION OF ILLINOIS.

NEEDLE-THREAD-CONTROLLING DEVICE FOR SEWING-MACHINES."

1\To. 800, 19s.

' Specification of Letters Patent.

Patented Sept. 26, 1905.

Application filed July 28, 1902. Serial No. 116,624.

To all whom it may concern.-

Be it known that I, RUssnL Gr. WooDWARD,a

- citizen of the United States, residing at Waukegan, 111 the county of Lake, State of Illinois,

have inventedcertain new and useful Improvements in Needle-Thread-Controlling Devices for Sewing-Machines, of which the following is a description, reference being had to portion of slack thread and to take up the slackin the needle-threads successivelythat is, as the looper moves forward to engage the needle-loops, all the threads being slack at an interval of time before the looper passes into the loopsand to successively tighten the threads as the looper engages the respective loops moving from right to left, the righthand thread being tightened first, and to successively tighten the threads in the downward movement of the needles as the looper recedes from the needles, the left-hand thread being tightened first. By this arrangement the making of imperfect stitches is avoided, the

needle-threads being prevented from moving together on the under side of the fabric and the stitches being prevented from breaking because of unequal pull thereon by the looper, the present apparatus permitting the threads being taken at the proper relative intervals of time with the proper tension to avoid strain and yet avoid too much slack. y

The invention therefore consists in an .ar rangement for accomplishing the above-mentioned objects which is hereinafter described, and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevation of so much of a sewing-machine as is necessary to a complete understanding of the invention, in this figure the looper being shownin its extreme retract- I ed position and the needles intheir lowest po sition, the needle-threads being all drawn taut. Fig. 2 is a side view of the head of the machine, illustrating the position of the needles and looper as the looper is taking the loop of the right-hand-needle thread, this thread having been pulled taut, while the other two threads are slack. The needles are moving up. Fig. 3 is a similar view showing the position of the parts when the looper has passed completely into all the needle-loops and is at the extreme of its forward movement, the needles having reached the limit oftheir upward stroke and the threads being all taut. Fig. 4 is a similar view showing the position of the parts asthe looper is moving back out of the needle-loops and the needles are moving down, the looper having passed out of the left-hand-needle loop and being just about to pass out of the second needle-loop, the thread of I the left-hand needle being taut, of the second needle being a trifle slack, but almost at the point of tightening, andthe right-hand-needle thread loose.

In the drawings, A represents the bed of the machine, N the needle-bar, L the looper, cooperating with the three needles a b 0, carrying the threads 1 2 3, respectively. These parts, as Well as the other customary parts of struction.

The needle-points are arranged at different elevations, as shown, which 1s a usual conthe sewing-machine, being of well-known construction when a single looper cooperates with a plurality of needles to form a stitch.

The main feature of construction, whereby the results aimed at are accomplished, aside from the broad invention, which conslsts in means for separately and successively controlling the needle-threads so as to tighten up the threads successively as the looper enters the needles and tighten them successively as the looper leaves the needles, leaving them slack 'as the looper begins its forward movement and begins its backward movement, resides in the use of a series of guiding-eyes 4 5 6 for the needle-threads (herein shown as formed in the part 7, attached to the needle lever), said eyes guiding, respectively, the

threads 1 2 3 and arranged in different vertical planes, so that they pull onor release the respective threads separately and successively as the forward end of the needle-lever swings up or down. This barcarrying the eyelets is preferably inclined and secured to the needlebar lever; but this is not essential.

In operation when the looper is at its extreme backward position theneedles are down and the eyelets have pulled all the threads taut. As it moves forward to take the loops, the needles moving up to throw out such, the bar 7 rises and the threads are slackcned. As the needles rise still higher and the looper passes into the loops the top eyelet 6 first tightens the thread 3 of the right-hand eyelet, and successively the eyelets 5 and 4 tighten the threads 2 and 1 of the middle and lefthand needles, respectively. When the looper has passed to the limit of its forward movement and the needles to the limit of their upward movement, as shown in Fig. 3, the threads are all taut; but as the needles descend and the looper recedes from the loops the eyelets 4 5 6, respectively, release or allow to slacken the threads 1 2 3, as shown in Fig. 4, until the looper has passed entirely out of the loops, when the threads are taut again.

Another feature of advantage is that as the eyes of the needles are at different elevations in machines of this character and move through difierent distances below the throatplate the eyelets 4 5 6 regulate the amount of slack that is taken up and pulled off for the respective needles. 4

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a sewing-machine having a plurality of needles, and a single looper cooperating therewith to form stitches, means for successively and separately controlling the needlethreads as the looper enters, and recedes from, the needle-loops to tighten the threads successively as the looper enters the needle-loops, and tighten them successively as the looper leaves the needle-loops, leaving them slack while the looper begins its forward and its backward movement; substantially as described.

2. In a sewing-machine having a plurality of needles, and a single looper cooperating therewith to form stitches, means for successively and separately controlling the needlethreads as the looper enters, and recedes from, the needle-loops to tighten the threads successivel y as the looper enters the needle-loops, and tighten them successively as the looper leaves the needle-loops, leaving them slack while the looper begins its forward and its' Y backward movement and comprising a series trolling the needle-threads as the looper enters, and recedes from, the needle-loops, to tighten the threads successively as the looper enters the needle-loops, and tighten them successively as the looperleavcs the needle-loops, leaving them slack while the looper begins its forward and its backward movement; substantially as described.

4. In a sewing-machine having a plurality of needles whose eyes are set in dili'erent horizontal planes and move through difl'e1entdistances below the throat-plate, a single looper cooperating therewith to form stitches and means for successively and separately controlling the needle-threads as the looper enters, and recedes from, the needle-loops, to tighten the threads successively as the looper enters the needle-loops, and tighten them successively as the looper leaves the needleloops, leaving them slack while the looper begins its forward and its backward movement, and comprising a series of eyelets simultaneously movable but arranged in different horizontal planes; substantially as described.

5. In a sewing-machine comprising stitchforming mechanism, including a plurality of needles, and a single looper eor'iperating therewith to form stitches, means for controlling the slack of said needle-threads separately and successively, including a bar attached to the needle-lever of the machine, and having a plurality of eyelets through which the threads pass, said eyelets being arranged in different horizontal planes; substantially as described.

6. In a sewing-machine comprising stitchforming mechanism, including a plurality of needles and a single looper cooperatingtherewith to form stitches, means for controlling the slack of said neodle-tlu'cads separately and successively, including a bar attached to the needle-lever of the machine, and having a plurality of eyelets through which the threads pass, said eyelets being arranged in different horizontal and vertical planes; substantially as described.

7. A sewing-machine having a plurality of needles set in a plane at right angles to the line of feed, and a single looper cor'iperating therewith to form stitches; means for successively tightening the needle-tlu'eads, as the looper passes into the needle-loops. and for successively releasing the threads, as the looper begins to move out of the needleloops but as its point leaves each loop, to tighten same; substantially as described.

8. A sewing-machine having a plurality of needles set in a plane at right angles to the line of feed, and a single looper cooperating therewith to form stitches; means for successively tightening the needle-thrczuls, as the looper passes into the needle-loops, and for successively releasing the threads, as the looper begins to move out of the needlellO loops but as its point leaves 'each loop, to l In testimonywhereoflaffix my signaturein tighten same, said means includinga movable presence of two witnesses.

bar havin a series of eyelets arranged in 1 diflerent h rizontal and vertical planes Where- RUSSEL WOODWA/RD' 5 by they successively act upon the needle- Witnesses:

threads in the manner referred to; substan- CHESTER MGNEIL,

tially as described. EMMA KERN.

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