US2009871A - Shoe sewing machine - Google Patents

Description

July 30, 1935. I A. w. BRADBURY 2,009,871

SHOE SEWING MACHINE Filed March 12, 1934 2 Sheets-Sheet 1 ms Joan/bl xi? f 6 2% @M July 30, 1935. A. w. BRADBURY 2,009,871

SHOE SEWING MACHINE Filed March 12, 1934 2 Sheets-Sheet 2 WW mentor:

Patented July 30, 1935 UNITED STATES- SHOE SEWING MACHINE Albert W. Bradbury, Cliftondale, Mass, assignor to United Shoe Machinery Corporati son, N. J., a corporation of NewJers Application March 12,

4 Claims.

The present invention relates to improvements in Wax thread sewing machines of the McKay type, such for instance as described in thepatent to Ashworth No. 1,914,936, granted June 20, 1933,

having a straight hook needle, a rotary horn and other stitch forming and work feeding devices. More particularly the invention relates to improvements in a McKay type sewing machine adapted to lay a seam beneath a concealed flap formed by making a single continuous out about the marginal portion of the shoe outsole.

The horn of a McKay machine is of limited size and rotatably mounted so that all of the stitch forming devices, aside from the needle threading means, are mounted to operate at the opposite side of the work from the horn, materially restricting the movements and positions assumed by the stitch forming devices. The work is usually fed by a feed point acting to penetrate a short distance below the surface of the work without passing through, and the presser foot is intermittently raised a uniform distance to'release the work for easy movement while being fed, so that the feed point will not tear the surface acted on. The arbitrary addition of other work engaging devices to the already crowded space is, therefore, likely to aggravate those difficulties. For this reason, the use of both a flap turning tool and a channelling knife of a McKay type of sewing machine has, therefore, been consideredimpractical. Accordingly, before a McKay shoe having a seam concealing flap may be sewed, it is the usual practice to provide an additional groove in which the seam is embodied in the surface of the outsole beneath the flap to permit the flap to be cemented in smooth contact with the surface under the flap after sewing.

The object of the present invention is to provide a novel and improved sewing machine of the McKay type arranged not only to cut a groove, but at the same time to raise the flap of a shoe sole, so that the seam and groove may be formed in accurate alinement simultaneously beneath the flap.

The features of the present invention include the provision, in a McKay type shoe sewing machine having substantially all of the stitch forming devices at one side of the work, of a work grooving knife and a flap turning tool also arranged to engage the side of the work acted upon by the other stitch forming devices. As illustrated, the flap turning tool is yieldingly mounted on the presser foot, so that the pressure of the flap tool against the Work may be relieved withon, Pater- 1934, Serial No. 715,110 (01. 112 45) out actually being disengaged from the work during feeding movements of the feed point.

These and other features consist of certain constructions, combinations and arrangements of parts, the advantages of which will be apparent 5' from the following description. r

In the drawings illustrating the invention in its preferred form, Fig. 1 is a view in front elevation of a portion including the stitch forming and work feeding devices of. a sewing machine embodying the features of the invention; Fig. 2 is a corresponding view on. an enlarged scale of a portion ofthe mechanism shown in Fig. 1; Fig. 3 is a view in side elevation of the parts shown in Fig. 2 looking from the right; Fig. 4 is a sectional view taken along the line 44-4 of Fig. 2; Fig. 5 is av view in side elevation on a still further enlarged scale of the lower portion of the presser foot and the flap turning tool mounted thereon; and Fig. 6 is a view in front elevation of the parts illustrated 20 inFig. 5.

The machine illustrated in the drawings comprises a straight hook needle ID, a rotary work supporting horn 62 having. a needle threading whirl M, a rotary shuttle IS, a presser foot l8, a 25, feed point 20, and a loop spreader 22; All of the stitch forming and work manipulating devices enumerated, with the exception of the horn and the whirl, are located to operate from the upper side of the work, indicated at 24.

The presser foot [8 is supported at the end of a vertical reciprocating presser foot bar 26. The presser foot bar is resiliently held in a lowered position and is intermittently retracted to release the work by mechanism indicated generally at 28, 35 which in turn is operated in suitable timed relation with the other stitch forming devices." The feed point 20 is clamped at the lower end of a carrier 36 slidably mounted for vertical movement towards and away from the work in a guide frame 40 32 which is pivotally mounted at 34 on the frame of the machine. Feeding movements are imparted to the work by oscillating the feed point carrier about the pivot 34 while the presser foot releases the work, the presser foot mechanism 28 45 acting to raise the presser foot a uniform distance from the surface of the work, regardless of the thickness of 'the work.

In the machine embodying the present invention, both a work grooving knife and a flap turn- 5 ing tool are provided, so that a shoe having a seam concealing flap may be sewed without providing a separately out groove in which the seam must be formed. The grooving knife, indicated at 35, is pivotally mounted on a horizontal arm 36 secured 55 2. to the lower end of the presser foot bar 26, and is so arranged on the arm that the lower end of the knife will penetrate the work to the proper depth while the presser foot engages the work. The lower end of the knife passes through an opening formed in an extending portion of the feed point 20 to move the knife in the line of feed with the feed point. The presser foot being raised during the feeding movement of the feed point, no cutting action of the knife 35 will take place, but during the back feeding movement of the feed point, the work is clamped by the presser foot and a groove will be formed by the knife corresponding in length to the machine embodying mechanism for so forming a stitch receiving groove in the work is more fully described in the application of Whitaker Serial No. 675,739 filed June 14, 1933.

fhe flap turning tool, indicated at 38, is mounted directly on the presser foot at one side of the line of feed and in advance of the lower work engaging surface it'of the presser foot. The flap turning tool operates to engage a surface 42 of the work, beneath a flap portion 44 formed by making a single continuous cut at an angle to the surface of the work around the margin thereof before sewing. The flap 44 is raised from a horizontal position to an upright position illustrated moreqclearly in Fig. 3, and the lower edge of the tool 38 is bent rearwardly to conform more closely to the curvature of the flap. The position of the fiapturning tool 38 at one side of the feed point does not interfere with the operation of the feed point and grooving knife, and. since it operates to engage the work in advance of the presser foot it does not interfere with the clamping action of the presser foot against the surface 42.

To permit the flap turning tool to engage the work while the presser foot is raised, the tool is provided with a cylindrical shank portion 48 slidable in a vertical passage formed in the presser.

foot. To prevent twisting of the flap turning tool, the intermediate portion of the tool is of squared section to engage flat vertical sides of a recess 50 in the presser foot. The upper end of the tool is engaged by a short, flat spring member v52' fastened at one end to the upper surface of the presser foot by a screw 54 and forked at the other end. The forked end of the spring engages slots 56 formed in the cylindrical portion of flap turning, tool to hold the tool in place. The spring 52 also causes the fiap turning tool to be forced yieldingly against the surface 42 of the I work when the presser foot is down.

The invention having been thus described, what is claimed is: p

1. A shoe sewing machine of the McKay type distance between sitches. A

engaging devices including having, in combination, a straight hook needle, a rotary work supporting horn, a presser foot for alternately clamping and releasing the work supported by the horn, a feed point acting on the side of the work engaged by the presser foot to feed the work when released, and other work engaging devices including a tool for raising a seam concealing flap in advance of the stitch forming devices and a channelling knife arranged to form a stitch receiving groove in the surface of. the work beneath the flap.

2. A shoe sewing machine of the McKay type having, incombination, a straight hook needle, a rotary work supporting horn, a presser foot for alternately clamping and releasing the work supported by the horn, a feed point acting on the side of the work engaged by the presser foot to feed the work when released, and other work a tool for raising a seam concealing flap in advance of the stitch forming devices and a channelling knife connectedto the feed point for reciprocating movement in the line of feed to form a stitch receiving' groove in the surface of the work beneath the flap.

3. A shoe sewing machine of the McKay type having, in combination, a straight hook needle, a rotary work supporting horn, a presser foot for alternately clamping and releasing the work supported by the horn, a feed point acting on the side of the Work engaged by the presser foot to feed the work when released, and other work engaging devices including a channelling knife arranged to form a stitch receiving groove in the surface of the work and a tool yieldingly mounted on the presser foot for engagement with the work while the presser foot releases the work to raise a seam concealing flap in advance of the engagement of the other stitch forming devices with the work. I

4. A shoe. sewing machine of the McKay type having, in combination, a straight hook needle, a rotary work supporting horn; a presser foot for alternately clamping and releasing the work supported by the horn, a feed point acting on the side of the work engaged by the presser foot to feed the work when released, and other work engaging devices including a channelling knife connected to the feed point for reciprocating movement in the line of feed and a tool yieldingly mounted on the presser foot for engagement with the work while the presser seam concealing flap in advance of the engagement of the other stitch forming devices with a the work. U ALBERT W. BRADBURY.

foot releases the work to raise a

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