US1195834A - Thews - Google Patents

Description

C. D. MATTHEWS.

THREAD CUTTING BLADE FOR SEWING MACHINES.

APPLICATION FILED AUG. 18. 1915.

1 1 95,834 Patented Aug. 22, 1916.

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W/TNESSES I l/VVE/VTOR y CDMOWMWS V I By 4 TTORNEYS I 'rnnws, a citizen of the United States, and

ATEW I CHARLES IDAVES MATTHEWS, OF NEW ORLEANS, LOUISIANA, ASSIGNOR OF ONE-HALF '10 HENRY E. GUMBEL, OF 'NEW ORLEANS, LOUISIANA.

THREAD-CUTTING BLADE non snwrne-nncninns.

specification of Letters Patent. Patented Aug. 12 M65 Application filed August 18, 1915. Serial No. 46,077.

To all whom may concern:

Be it known that I, CHARLES D. .MAT-

a resident of-New Orleans, in the parish of Orleans and State of Louisiana, have in vented a new and Improved Thread-Cutting Blade for Sewing-Machines, of which. the following is a full, clear, and exact description.

This invention relates to a thread cutting attachment for sewing machines and has for its principal object to provide a device of this character which is adapted to be applied to the foot or cloth plate ofa sewing machine so as to enable the operator to quickly and conveniently cutthe thread and to avoid undue waste of the latter, the cutting device being in the form of'a blade, which is set into and extends longitudinally of a slot in the plate and is secured to the under side of the latter in any desired manner, with the free end of the cutter disposed above theplate and suitably shaped so that the threads can be engaged under the cutter, which has its lower edge sharpened and inclined at a suitable angle, so that by drawing the thread longitudinally of the cutter the thread will be effectively cut. The shape, angle and length of the cutter may be varied, and its location with respect to the needle may be determined as convenience and efliciency dictates.

For a more complete understanding of the invention reference is to be had to the following description and claims taken in connection with the accompanying drawing, wherein similar characters of reference indicate corresponding parts in all the views, and in which- Figure 1 is a perspective view of a sewing machine showing the thread cutter applied to the cloth plate; Fig. 2'is a plan view of the cutter and the plate to which it is attached; Fig. 3 is a bottom plan view of Fig. 2; Fig. 4 is an enlarged sectional view on theline 4-4, Fig. 1; Fig. 5 is a sectional view on the line 5.-5, Fig. l; Fig. 6 is a perspective view of the cutter or blade depreferably made of a single piece of metal and consists of a vertical blade 1 having at one end a laterally extending attaching base 2 formed with bifurcations 3, and on the free end of the tip of the blade is a laterally projecting lug i which is rounded and serves to prevent the material being sewed from catching on the blade, the upper edge of the latter being also rounded at 5 for the .same purpose. The bottom edge 6 of the other words, it may be applied to the right or left of the needle D of the sewing machine, and it is mounted in such a manner that the free end extends rearwardly or away from the operator. The plate to which the cutting device is attached has a slot 7 which is considerably wider than the blade 1, so that there is no danger of dirt accumulating and preventing the efiective cutting of the thread. The blade 1 is disposed in a vertical plane and its cutting edge 6 inclines downwardly in a forward direction so that,

as thethread is engaged under the tip of the cutter and drawn forwardly toward the operator, the tension on the thread is increased so that the cutting edge will sever the thread. The base portion 2 may be fastened by one of the screws 8 which secure the cleat or retaining member 9 to the plate B, as shown in Figs. 2 to 5 inclusive, but, if desired, the base member 2 may extend in the same direction as the lug 4, as in Fig. 7, and be secured by a separate screw 10, the bifurcations 3 of the base member straddling the screw, as shown.

In using the cutter after the sewing is finished, the .work is drawn away from the needle so as to pull out the threads a short distance, and then the threads are engaged under the tip of the blade. The operator A then draws the work toward her and causes the thread to slip under the cutting edge 6, which, by its angle, causes the tension of the thread to increase, and thereby the cutting edge severs the thread. As the cutting edge llld is of considerable length it will be efi'ective even after the front or tip portion becomes dull. The blade is suitably spaced from the needle D and presser foot E, so that after the threads are cut the ends will be of sufficient length to be ready for the next sewing operation.

Although the cutter is shown in the cloth and throat plate of the machine it is to be understood that it may be mounted at a convenient point in the bed plate F, if desired. From the foregoing description taken in connection with the accompanying drawing, the advantages of the construction and method of operation will be readily understood by those skilled in the art to which the invention appertains, and while I have described the principle of operation, together with the device whichI now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made when esired as fall within the scope of the appen ed claims.

"from catching on the blade, the base end of the blade being provided with an anchoring member, and the bottom edge of the blade being inclined and sharpened, whereby the thread engaged under the blade can be cut by being drawn longitudinally of the blade.

- 3. A thread cutting attachment of the class described, comprising a vertical blade having a downwardly inclined bottom cutting edge, a laterally projecting anchoring member on the base'end of the blade, and a flat horizontal guard member on the tip end of the blade and extending laterally therefrom and rounded for preventing the work from being caught thereon, the cutting edge inclining upwardly from the base end of the blade to the tip.

In testimony whereof I have signed my name to this specification in the presence of two-subscribingwitnesses.

CHARLES DAVES MATTHEWS.

Witnesses:

ULYSSES DAVID CHABERT, E. G. HANSON.

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