US1251352A - Sewing-machine presser-foot. - Google Patents

Description

I .A; H. DE v05 SEWING MACHINE PRESSER FOOT, v APPLICATIONJIILED JUNE 20. I916.

1,251,352. f 1 0 mm Bee 25, 19 1?.

UNITED STATES PATENT oEEIcE.

ALBERT H. DE VOE, OF WESTFIELD, NEW JERSEY, ASSIGNOB TO THE SINGER MANU- FACTUBING COMPANY, A CORPORATION OF NEW JERSEY.

SEWmG-MACHINE PBESSEB-FOOT.

To all whom it may concem:

Be it known that I, ALBERT H. DE V01], a citizen of the United States, residing at l/Vestfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Presser-Feet, of which the following is a specification, reference being had therein to the acompanying drawings.

This invention has for its object to pro {vide a sewing-machine presser-foot with means for cutting, with certainty and close to the work, the stitching-threads and any loose threads of the fabric atthe completion of a seam.

According to the present invention the presser-foot is preferably formed with a foot-plate havingin its rearward end a forwardly extending notch adjacent which its upper face affords a seat upon which is secured a thread-cutting blade having a sharpened edge above one side of said notch and extending into a clearance notch or recess between said foot-plate and the presser-foot shank which partially overhangs such cutting edge. With a resser-foot so constructed, at the completion of a seam the threads extending from the work may be drawn forwardly into the notch and across the cutting edge of the knife-blade against which they are pressed by the overhanging portion of the foot and thereby severed close to the work.

The clearance recess is preferably deeper than the thickness of the knife-blade, so that when the threads are drawn against the blade their advance is not wholly obstructed at the crossing of the overhanging with the cutting edge, but they become wedged within the space between the two and in their continued movement travel slightly along the cutting edge so as to be severed by a draw-cut. Y

In the accompanying drawings, Figure 1 is a perspective view of a resser-foot constructed in accordance with the present im- .provement, and showing the manner in bottom view of the presser-foot. Fig. 6 is a perspective view, taken from the under side, of the thread-cutting knife, detached. Figs. 7 8 and 9 are respectively a side ele- Specification of Letters Patent.

Patented Dec. 25, 191'?a Application filed June 20, 1916. Serial No. 104,651.

vation, a plan, and a rear end view of another form of resser-foot embodying the present invention.

As represented in Figs. 1 to 6 inclusive, the presser-foot is constructed with the usual slotted shank 1 formed with the forwardly ofiset portion 2 connected with and sustaining the rearward portion of the foot-plate 3 which is provided with the usual needleaperture 4:. The foot-plate is shown rovided at its rearward end with the forwardly extending l-shaped notch 5 at one side of which the shank is formed with a lateral clearance notch or recess 6 of which the bottom is flush with the top of the foot-plate.

The upper face of the foot-plate affords a seat upon which is secured by means of the fastening screw 7 the angular knife-blade 8 having at its upper face the sharpened knife edge 9 disposed at the outer side of the notch 6 and extending substantially parallel therewith and into the recess 6 by the upper wall of which it is overhung.

The lateral notch or recess 6 is shown in Figs. 2 and 3 as deeper than the thickness of the blade 8 so as to leave a thin space between their adjacent faces to receive the thread. The portion 2 of the resser-foot shank is shown having one corner cut away or beveled at 2 correspondingly with the adjacent side of the notch 6 to assist in directing the thread to the sharpened edge of the cutting blade.

-'The blade 8 is formed with a lateral-extension 10 terminating in a shoulder to embrace the shank portion 2 for assisting the screw 7 in holding the blade securely in place.

In the use of this presser-foot, the seam s is formed in the usual manner in the fabric m, and at its completion the operator draws the stitching-threads t upwardly and forwardly, as'represented in Fig. 1, the threads being deflected by the inclined face 2 of the shank portion 2 toward the cutting edge 9 of the knife-blade by which it is initially deflected into the notch 6 and beneath the overhanging portion of the shank 2 between the wall of which and the knife-blade it becomes jammed so as to be pressed against the sharpened edge of the blade in its continued movement wherein it is severed with certainty by a draw-cut action. While the overhang of the portion of the resser-foot immediately above the knife-blade acts to force the thread against the cutting edge of the latter, the slight spacing of such overhanging portion above the upper face of the knife-blade obviously contributes materially to the certainty of action of the device in severing the thread by a draw-cut rather than by a tearing action.

In the form of the improvement repre sented in Figs. 7, 8 and 9, the presser-foot shank 1 is shown formed with a forwardly projecting portion 2 to the forward end of which is pivotally secured by means of the pin 11, the spaced upwardly extending ears 12 of the separate foot-plate 3 which is provided, as in the previously described form of the improvement, with the needle-aperture 4 and the thread-notch 5 partially overhung by the shank portion 2'. A clearance notch or recess 6 is formed in the footplate 3 beneath the presser-foot extension 2' affording a seat upon which is secured by means of the screw 7 the knife-blade 8' formed with the cutting edge 9 arranged similarly to that of the corresponding element of the foot previously described.

In this form of the improvement the shank is shown formed with a bevel 2* to assist in directing the thread, but the fiat side of the shank extension 2 is the part which directs the thread initially against the knife-edge; but otherwise the operation of this form is similar to that represented in the preceding figures.

From the foregoing description it will be seen that the present improvement is suscep tible of somewhat difierent embodiments, and it is therefore evident that the invention is not limited to the exact details of, construction herein shown and described.

Having thus set forth the nature of the invention, what I claim herein is 1. A sewing machine pressezr-foot provided with a thread-cutting blade having a continuous cutting edge and with an unsharpened thread-guiding element lying in a plane substantially parallel to said blade and spaced therefrom and inclined to and in crossing relation with said thread-cutting edge, whereby thread guided by said element is severed by a draw-cut.

2. In a sewing machine, a presser-foot having a shank and a foot-plate carried thereby, a portion of said shank overlapping said foot-plate, a clearance space being provided therebetween, and a thread-cutting knife-blade mounted on the foot-plate and projecting into said space.

3. A sewing machine presser-foot having a foot-plate provided with a seat and with an intersecting notch extending forwardly from its rear end, said foot having a pora foot-plate provided with a seat and with I an intersecting notch extending forwardly from its rear end, said foot having a portion overhanging said seat upon one side of the notch, and a thread-cutting knife secured to said seat and formed with a. cutting edge disposed at an angle with and partially overhung by and spaced from said portion of the foot. y

5. A sewing machine presser-foot comprising a shank section having a forwardly extending portion and a foot section pivotally secured to and extending beneath said projecting portion of the shank section and formed in its rearward extremity with a forwardly projecting notch partially overhung by said portion of the shank section, and a thread-cutting knife secured to said foot section, and provided with a cutting edge disposed above the outer side of said notch and extending beneath said forwardly projecting portion of the shank section.

6. A sewing machine presser-foot having a foot-plate provided rearward of the needle-aperture with a notch of which one side is inclined toward the line of stitching, and a knife-blade sustained parallel with the operative face of the foot-plate and having a cutting edge disposed in crossing relation with said inclined side of the notch.

7. A sewing machine presser-foot having a foot-plate provided rearward of the needle-aperture with a notch formed with convergent sides both inclined relatively to the line of stitching, and a knife-blade sustained parallel with the operative face of the foot-plate and having a cutting edge disposed in crossing relation with one of the inclined sides of said notch.

8. A sewing machine presser-foot having a foot-plate provided rearward of the' ALBERT H. DE VOE.

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