US1943254A - Darning foot for sewing machines - Google Patents

Description

Jan. 9, 1934. w L. BARRON 1,943,254

DARNING FOOT FOR SEWING MACHINES Filed Oct. 25, 1932 l 80 i i 23. i 19 i 11 E z 7 a 16 15 WHY/Ill liWWfl/IIIIIIl/I/I J9 I 16 a? ,7 5

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William L. Bar/0 10 Sitar/MA Patented Jan. 9, 1934 1,943,254 DARNING FOOT FOR SEWING MACHINES William L. Barron, Laurence Harbor, N. J., as-

signor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application October 25, 1932. Serial No. 639,403

5 Claims.

This invention relates to sewing machine a tachments and more particularly to a darning foot which may be attached to any of the well known types of family sewing machines.

It is the object of this invention to provide a darning foot which will operate with the minimum of noise, which will offer the least possible obstruction to the operators view of the Work and which can be manufactured and assembled at little expense.

With the above and other objects in view, as will hereinafter appear, the invention consists in the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Figure 1 is a fragmentary front elevation of the needle-bar and the presser-bar showing my improved darning foot attached to the latter, with the presser-member in raised position.

Figure 2 is a view similar to Figure 1 showing the presser-member in a lowered position.

Figure 3 is a side elevation similar to Fig. 2.

Figure 4 is a sectional view taken along the line 4-4 of Figure 2.

Figure 5 is a disassembled perspective view of the several parts.

In the drawing 1 is the needle-bar bearing, 2 is the needle-bar, 3 the needle-clamp, 4 the needle, 5 the presser-bar, and 6 the clamp-screw for the presser-foot, all of which are old, and well known in family sewing machines.

In the embodiment selected for illustration my improved darning-foot comprises a vertical plate 7 having at the bottom of its rearward side the usual socket 8 which embraces the presser-bar 5 to which it is secured by the clampscrew 6. The central part of the plate 7 is arched outwardly, as shown at 9, to afiord a longitudinal cavity for the compression spring 10. The plate 7 is formed with marginal lips 11 and 12 which overhang the front face of the plate 7 and which afford a guideway for the substantially fiat body of the presser-member 13. The presser-member 13 is formed at its lower extremity with a depending offset forwardly extending foot-plate 14 having a needle-aperture 15. The upper extremity of the presser-member 13 is formed with a lateral extending rigid arm 16 overhanging the needle-clamp. An L-shaped stop member 17 secured to the presser-member by the screw 18 has one of its ends extending through the aperture 19 in the presser-member. The upper end of the compression spring 10 acts against the upper wall of the longitudinal cavity 9 in the plate '7 and the lower end of the spring acts against the L-shaped stop 17, thereby constantly urging the presser-member downwardly. To cushion the shock and to absorb noise, I have provided a wire spring 20 -having independently acting arms 21 and 22, the spring 20 being secured to the presser-member 13 by the screw 23. The arm 21 of the spring extends above and normally rests upon the marginal lip 12 of plate 7, and the other arm 22 is spaced below the rigid arm 16 of the pressermember 13, the U-shaped portion 22' of the spring arm 22 overlying the arm 16.

In the operation of the device, when the material to be darned is in position to be acted upon by the stitch-forming mechanism, and the needle begins its downward movement, the foot-piece 14 of the presser-member 13 urged downwardly by the compression spring 10 engages the material and holds it firmly against the cloth-plate 24 while the needle is in the work. Slightly before the presser-member 13 reaches its lowest position the arm 21 of the spring 20 engages the top of the marginal lip 12 and absorbs the momentum of the presser-member 13. The presser-foot 14 remains in its lowest position while the needle is in the work and releases the work automatically when the needle approaches its uppermost position so that the work may be shifted thereunder in any direction. This is accomplished by the needleclamp 3 engaging the arm 22 of the wire spring 20 and forcing the presser-member 13 upward to the position shown in Figure 1. It will be obvious that the arm 22 of the spring 20 will yield when it is engaged by the needle-clamp 3, thereby cushioning the blow.

It will be apparent that minor changes in the details of construction may be made Without departing from the spirit and scope of the invention as set forth in the appended claims.

Having thus set forth the nature of the invention, what I claim herein is:

1. A darning foot for sewing machines comprising, a plate adapted to be fixed to the presserbar of a machine, said plate being formed with a rearwardly extending longitudinal cavity, a presses-member mounted to reciprocate vertically on said plate, a compression spring disposed within the rearwardly extending cavity in the plate, said spring having one of its ends acting against the plate and its other end against a stop carried by the presser-member, and a laterally extending arm carried by said presser-member, said arm being adapted to contact with the needle-clamp when it approaches its highest position to cause the needle-bar to lift the pressermember.

2. A darning foot for sewing machines comprising, a plate adapted to be fixed to the presserbar of the machine, a presser-member carried by said plate, spring means for constantly urging said presser-member downwardly, a laterally extending arm on said presser-member, said arm being adapted to contact with the needle-clamp when it approaches its highest position to cause the needle-bar to lift the presser-member and means for cushioning the blow of the needleclamp against the arm.

3. A darning foot for sewing machines comprising, a plate adapted. to be fixed to the presserbar of the machine, a presser-member carried by said plate, spring means for constantly urging said presser-member downwardly, a laterally extending arm on said presser-member, said arm being adapted to contact with the needle-clamp when it approaches its highest position to cause the needle-bar to lift the presser-member and means for cushioning the blow of the needleclamp against the arm, said last named means comprising a wire spring fixed to the pressermember and having its free end spaced below and substantially parallel with the rigid arm.

4. A darning foot for sewing machines comprising a plate adapted to be fixed to the presserbar of a machine, said plate having marginal lips overhanging its front face to afford a guideway, a presser-member mounted to reciprocate vertically in said guideway, spring means for constantly urging said presser-member downwardly, a lateral arm carried by said presser-member, and a spring carried by said presser-member for cushioning the downward movement of the presser-member when it approaches its lowest position.

5. A darning foot for sewing machines comprising, a plate adapted to be fixed to the presserbar of a machine, said plate having marginal lips overhanging its front face to afford a guideway, a presser-member mounted to reciprocate vertically in said guideway, spring means for constantly urging said presser-member downwardly, a lateral arm carried by said presser-member, and a spring secured to said presser-member, said spring having independently acting arms one of which is spaced below and substantially parallel with the rigid arm of the presser-member, and the other of which engages one of the marginal lips on the plate when the presser-member approaches its lowest position.

WILLIAM L. BARRON.

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