US1207228A - Thread-controlling device for sewing-machines. - Google Patents

Description

D.S.SEYMOUR.

THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

APPLICATION FILED NOV.4, 19H. mmmm. Patented Dec. 5,1916.

2 SHETSSHEET I. III

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f i 0 3n uc'nfo'c NW W 5 QX I tmcooao affo'onm j D. S. SEYMOUR. THREAD CONTROLLING DEVICE FOR SEWING MACHINES.

Patented Dec. 5, 1916.

2 SHEETSSHEET 2.

APPLICATION FILED NOV.4. 19H.

1 a 11 .1 2 w a INVENTOR Q 1 5,; 01 I 1 Allorney;

WITNESSES n erm ne rarnnm nip DUDLEY S. SEYMOUR, OF OAK PARK, ILLINOIS, ASSIGNOR TO UNION SPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

THREAD-CONTROLLING- DEVICE FOR SEWING-MACHINES.

Application filed November 4, 1911.

To all whom it may concern Be it known that I, DUDLEY S. SEYMOUR, a citizen of the United States, residing at Oak Park, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Thread- Controlling Devices for Sewing-Machines, of which the following is a description, reference being had to the accompanying drawing and to the letters and figures of reference marked thereon.

The invention relates to new and useful improvements in thread-controlling devices for sewing machines, and more especially to the control of the tension devices for the needle threads.

An object of the invention is to provide means whereby a plurality of tension devices may be simultaneously opened to allow thread to be freely drawn therethrough.

A further object of the invention is to provide an arrangement of thread guides whereby a plurality of threads may be led through independent tension devices and then brought together so as to be carried through other controlling members.

These and other objects will in part be obvious, and will in part be hereinafter more fully described.

In the drawings which show by way of illustration one embodiment of the invention,-Figure 1 is a View of the arm of a sewing machine from the rear side thereof, with my improvements applied thereto; Fig. 2 is a top plan view of the same; and Fig. 3 is a detail, showing the manner of operating the thread clamps. Fig. 4 is a sectional view through the bracket carrying the pullofi, showing in part the devices supported thereby; Fig. 5 is a sectional view longitudinally of the arm of the machine through the bracket, showing the pull-off and the threadcontrolling rolls cooperating therewith.

As herein illustrated, the sewing machine consists of an overhanging arm 1, in which is mounted a rotating driving'shaft. The needle bar 2 reciprocates in the forward end of the overhanging arm. The machine as shown herein, is especially adapted for operating with a plurality of threads. The threads are led from the supply through suitable thread eyes 3, which are secured to a supporting plate 4, mounted on a bracket 5, which in turn is attached to the upper face of the overhanging arm. These thread Specification of Letters Patent.

Patented Dec. 5, 1916..

Serial No. 658,554.

eyes are spaced along the upper edge of the supporting plate.

Located adjacent each thread eye is a light tension 6. Also carried by the supporting plate 4- are a plurality of tensions 7 There is a tension 7 for each thread, and said tensions are arranged adjacent the forward edge of the supporting plate 1 and in a line extending across the overhanging arm. Each of the tensions 7 consists of two disks 8 and 9. The disk 8 is connected with a stud 10, which extends through the supporting plate, and a spring 11 surrounding said stud bears at one end against a nut 12, and at the other end against the supporting plate. This spring normally presses the disks 8 and 9 toward each other, and causes a tension on the thread passing between the disks. The tensions are simultaneously released by a cross bar 13, which is carried by projecting arms 14:, mounted on a shaft 15, which is journaled in bearings in the bracket 5; On the outer end of the shaft 15 is an arm 16, which is adjustably secured thereto. The arm 16 is carried by a split collar of the usual construction which is adjustably clamped to the end of the shaft 15 by a screw 15 The presser bar of the machine is raised and lowered by a lever 17. This lever 17 carries a lug 18, which is adapted to engage the outer en d of the arm 16 when the presser bar is raised. An adjustable stop 19 limits the movement of the lever 17. When the machine is stopped with the needle above the work, and the presser bar raised through the swinging of the lever 17, the arm 16 will be engaged and the downward movement of the arm will impart an upward movement to the bar 13, which will engage all of the studs of the tension devices and simultaneously release the tensions on all the threads. As soon as the presser bar is lowered, the tensions 0n the threads will be restored. The thread after leaving the tensions 7 passes between two guiding rollers 20 and thence under roller 20 to the oiling pad 21. From the oiling pad the thread or threads are led over a roller 21 and thence through guiding fingers at the end of the arm supporting the oiling pad. The thread after leaving the fingers, passes underneath a roller 22 carried at the outer end of an L-shaped arm 22 The L-shaped arm is formedwith a collar 22* freely journaled on a sleeve carried by the bracket 22 which is secured to the overhanging arm of the machine. This L-shaped arm 22 is connected by a link 12 to a rock lever-17. The rock lever 17 is carried by a short shaft on which is mounted a segment 31 adapted to engage a rack 32 attached to the upper end of the presser bar. When the presser bar is raised and lowered, this rack through the segment will swing the rock lever and through the link will shift the position of the thread-guiding roller 22. The thread after leaving the roller 22 passes over a roller 24 carried by an arm 2%. This arm 24 is formed with a collar 24* fixed to a cross shaft 40 mounted in suitable bearings on the bracket 22. I

The cross shaft 40 is oscillated by an arm 40, which carries a ball stud and this cooperates with aneccentric strap 40 operated by the main shaft in the overhanging arm. The thread passes underneath the roller 23 and thence through clampingdisks 25. These clamping disks are normally held pressed against each other and against the thread by a spring-26. The cam arm 27 operated by the shaft 40 engages the outer end of the stud 28, which operates to release the clamping disks and allows the thread to run free- From the clamping disks the threads are led through guides 29 on the arm 30, the positionof which is controlled by the rock. shaft 17*. These threadcontrolling members and thread-clamping devices, as clearly shown in Fig. 2, are arrangedi centrally over the overhanging arm, and the threads passing from the supply through the tension disks are brought together by the guiding posts 20 and led from one controlling device to another to the needle bar. The thread clamps 25 are timed so as to release the thread when the needle is rising to the upper end of its stroke, and,

therefore, if the machine be stopped with the needle bar at the upper end of its stroke, and the tensions 7 released, the thread may be drawn freely through the machine.

The oiling pad 21 is attached by an arm 34 which is attached to the supporting plate 4, and, therefore, it will be noted that the tension devices, the releasing mechanism therefor and the oiling pad-with the guides for bringing the threads to the oiling pad and guiding the same to the pull-off mechanism, are all supported upon the single bracket which carries the supporting plate 4.

It is obvious that minor changes in the details of construction and arrangement of parts may be made, without. departing from the spirit of the invention as set forth in the appended claims.

Having thus described my invention, what Iclaim as new and desire to secure by Letters Patent, is r 1. Ase'wmg machme includingin comblnation an overhanging arm, a supporting plate, a plurality of separate tensions carried by said plate each including a supporting stud extending through the plate, a spring surrounding said supporting stud, tension disks carried by each stud and held yieldingly in contact by the spring, a bar common to all of said studs, and means for moving the bar to actuate said studs to simultaneously release the tensions.

2. A sewing machine including in combi-- 3. A sewing machine including in combination, an overhanging arm, a bracket mounted thereon, a supporting plate carried by the bracket,.a plurality of separate tensions carried by said plate and arranged in a line extending across said plate, each of said tensions including a supporting stud extending through the plate, tension disks carried by each stud, a spring for holding said tension disk yieldingly in contact, a bar common to all the studs, means for moving the bar to actuate the studs to simultane ously release the tensions, a plurality of thread controlling devices arranged centrally over said arm, and guiding devices for bringing the thread passing through the tension devices together and guiding the same to the said controlling devices.

4. A sewing machine including in combination, an overhanging arm, a needle bar having needle guides at the upper end, and tension devices for a plurality of needle threads carried by said overhaging arm, and symmetrically disposed on each side of a center line passing through the arm, a pulloff device, thread clamps, a slack thread controller, and guides located substantially in a line passing through the guides at the upper end of the needle bar and centrally between said tension devices, whereby the needle threads passing through the tension devices may be brought together centrally over the arm and led directly through the controlling devices through the needle bar.

5. A sewing machine including in combination, an overhanging arm, a presser bar, a lever for lifting said presser bar, tension devices, a supporting plate for said tension devices, a bracket carried by the overhanging arm on which said supporting plate is mounted, a bar for releasing simultaneously said tensions, means for swinging said bar including anarm adapted to be engaged by the presser foot lifting lever, whereby when the presser foot is raised the tension would be released.

6. A sewing machine including in combination, an overhanging arm, a supporting plate carried thereby, said plate being inclined downward toward the end of the overhanging arm, a plurality of tension devices supported by said plate, guiding rollers located adjacent the central plane of the overhanging arm between which the threads are led from the tension devices, a guiding bar extending across the overhanging arm underneath which said threads are guided whereby the direction of-the threads led from the tensions is changed, so that the threads may be properly directed to the thread-controlling devices located centrally over the overhanging arm.

In testimony whereof I aflix my signature, in presence of two witnesses.

DUDLEY S. SEYMOUR. Witnesses:

C. L. STURTEVANT, C. MCNEIL.

Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. G.

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