US2062797A - Sewing machine - Google Patents

Description

Dec. 1, 1936. Q ROBERTS r AL 7 2,062,797 1 SEWING, MACHINE Filed Sept. 28, 1935 2 Sheets-Sheet l mam-12 l, 1936- -c. ROBER S E AL SEWING MACHINE Filed Sept, 28, 1935 2 Sheets-Sheet 2 Patented Dec. 1', 1936 2,062,797 7 SEWING MACHINE Clifford Roberts, Winchester, and JohnM. Whelton, Peabody, Mass., assignors to United Shoe Machinery Corporatiom'Paterson, N; .L, a-corporation of New Jersey Application September 28, 1935, Serial No. 42,656

7 Claims. (01. 112 l5) UNITED STATES P TE T o 1=11 The present invention relates to improvementsin shoe machines, and more particularly to machines for sewing the margins of shoe soles in which there is a concealed channel having a flap beneath-which the seam is formed. The invention is herein shown as embodied in a sole sewing machine of the so-called McKay type having a straight hook needle and a work. support which consists of a rotatable horn arranged to extend within the shoe, and provided at its tip with a needle threading device for laying the thread in the hook ofthe needle.

In stitching the outsole of a shoe having .a

seam concealing flap, it is necessary to raise the flap in advance of the point of operationof the stitch forming devices, andto hold it in raised position beyond the point where the stitches are completed. To do this, it is customaryto provide a plow-shaped turning tool more or less elon- 120 gated in theline of feed which acts directly on the flap. With such an arrangement, the space about the point of operation. of the stitch forming devices is not only crowded, but the elongated contact of the flap turning tool with 25 the work-renders manipulation of the work .dif-

35 With this object in view the features of the present invention includethe provision of means,

in a machine for. operating upon a shoe sole having a seam concealing channel, to raise the Ifiap covering the channel in advance of the. op- 40 eration of the operatingdevices by a jet of compressed air directed against the work in the proper-direction. With the use of an air jet, elongated contact with the work, as occurs with the use of a special flap turningtool is avoided 45 the air -jet being deflected by the flap and forced along theflap towards the oncoming work as it is fed to raise it into proper position. In applying the invention to a sewing machine as herein described, a tubular conductor for direct- 50 ing the air jet against the Work is mounted on the presser foot of the machine, and preferably there is provided a valve for shutting off the supply of air to the conductor while the machine is stopped.

Other features of the present invention con- 55 sist of certai constructions, combipations and "undesirable effects.

arrangements of parts, the radvantagesjof which will be apparent from the followingjdescription'.

In the drawings illustrating the invention in its preferred form,'Fig. 1, is a viewin' side eleVation of thefup-per portion, includin the stitch forming and work feeding devices,.of a sewing machine embodying the features of theinven-ftion; Fig. 2 is a view in front elevation ona somewhat larger scale, of a portion of the stitch forming and work feeding devices withthe work in (10 operating position in the machineyFig. 3 is a view on a still further, enlarged scale, partly in section illustrating the operationpf the air jet in raising the channel flap of a shoe; and Fig. 4 is a plan view on the same scale as Fig. 3 taken just above 5 the work showing the lowerends of, certain of the stitch forming devices in section. j

The machine illustrated in the drawings, comprises a straight hookn'eedle ID, a rotary work supporting, horn [2, a rotary shuttle 14, a presser foot I6, a feed point IS, a loop spreader 20, and other stitch formingdevices constructedand arranged tQoperate. in the manner described in U. S. patentto Bernard Leveque' No. l-,885,927 granted November 1, 1932.

To operate the machine on a shoe sold-such?" as indicated at ;22 having a seam concealing channel with aflap 24, it is necessary to raise the flap into an upright position as illustratedin Figs. 3 and 4, in order that the stitch forming devices may act properly. "The channel is usual- ,ly formed-by'making'a continuous cut extending inwardly, from or near the margin of the sole and increasingin thicknessfro-m the margin sothat frequently there is considerable resistance offered: against raising thejflap when bent sharply at, its root, it being desirable to form' the seam as close as possible to the apex; oi'the' anglebe tween the flap and the sole. The pressure against the work guiding devices of thema chinefre- I40 quired to raise the flap properly may cause improper operation of the machine or produce-other in order that theseam may be'formed 'close tothe apexlof the channel cut, in the embodiment of the present invention, a jetgof air under pr es sure is directed against theflap, so that after being deflected by the flap, the air will flow along the channel to raise the flap at either side and particularly in advance of the point of operation of the stitch forming devices. As the raised portion of the flap approaches the outlet of the jet, it need be raised only a small additional amount and maintained in raised position by the side surface of the presser foot, which in the present machine acts as a work guiding member. The pressure on the presser foot is, therefore, less than would be required to raise the flap without the jet and the flap is raised a greater distance at either side than is otherwise possible with a guiding member of a dimension in the line of feed as narrow as the presser foot.

The air is provided for the jet by a tubular conductor 26 having its outlet, indicated at 28, in the side of the presser foot. The lower end of the presser foot is formed with a work gripping surface 30, the rear side surface past which the flap 24 moves being somewhat rounded to reduce the drag. The tubular conductor 26 is secured by a suitable clamp 32 attached to the presser foot above the work, and the lower end of the tubular member passes horizontally through the presser foot so that the conductor is on the opposite side from the flap.

After the seam is completed and before the machine is again started, the supply of air, which may be from any suitable source, is out 01f. Before sewing is started, the work is moved into proper operating position with stitch-forming devices and the flap 24 raised by engagement with the side of the presser foot. As soon as the machine is started, air is permitted to flow through the conductor 26 by opening a valve 34- connected with the conductor through a flexible tubing 36, the inlet to the valve being at 38.

To operate the valve in starting the machine, it is connected with the driving and stopping mechanism of the machine under the control of a treadle operated rod 40. As in the machine of the patent above referred to, this rod is connected at its upper end with an arm 42 secured to one end of a horizontal shaft 44 extending across the machine. The other end of the shaft has fixed to it an arm 46 pivotally connected at its outer end with a valve operating rod 48. When the treadle rod is depressed in starting the machine, the operating rod 48 is moved downwardly to open the valve and cause the jet to be started.

The jet is then directed against the flap and due to the shape of the lower end of the presser foot, the air is caused to flow into the crevice and along the flap as it is fed, thereby raising the flap considerably in advance of the jet. To accentuate this result, the edge of the presser foot first engaged by the flap and past which the jet escapes is cut back or beveled, as indicated in Figs. 3 and 4, permitting the greater portion of air to escape in the desired direction. Once having been raised, the flap is held in raised position by the presser foot until the stitch-forming devices have operated, after which the flap may be bent back into its original position, concealing the stitches in the usual manner.

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

1. A shoe machine for operating upon work provided with a seam concealing flap having, in combination, a work support, suitable devices for operating on the work and means for directing a. jet of air under pressure against the work to r e e p fo the pe ating devices.

2. A sewing machine for operating upon work provided with a seam concealing flap having, in combination, a work support, a presser foot, stitch forming devices acting on the work between the work support and presser foot, and a tubular conductor mounted on the presser foot for directing a jet of air under pressure against the work to raise the flap in advance of the point of operation of the stitch forming devices.

3. A sewing machine for operating upon work provided with a seam concealing flap having, in combination, stitch forming devices, a work sup.- port, a presser foot engaging the work beneath the flap in advance of the point of operation of the stitch forming devices, and means comprising a tubular conductor for directing a jet of air under pressure against the flap to assist the presser foot in raising the flap.

4. A sewing machine for operating upon work provided with a seam concealing flap having, in combination, a work support, a presser foot, stitch forming devices acting on the work between the work support and presser foot, means comprising a tubular conductor for directing a jet of air under pressure against the work to raise the flap In advance of the point of operation of the stitch forming devices, and a valve on the machine for cutting oif the flow of air through the conductor when the machine is stopped.

5. A sewing machine for operating upon work provided with a seam concealing flap having, in combination, a work support, a presser foot, stitch forming devices acting on the work between the work support and presser foot, means comprising a tubular conductor for directing a jet of air under pressure against the work to raise the flap in advance of the point of operation of the stitch forming devices, a valve on the machine for cutting oif the flow of air through the conductor, and connections including a treadle operated rod for actuating the valve.

6. A sewing machine for operating upon work provided with a seam concealing flap having, in combination, a needle, a work support, a presser foot having a gripping surface to engage the channel beneath the flap in advance of the point of operation of the needle and having a side surface with a bevelled edge to assist in holding the flap raised as it is fed past the needle, and a tubular conductor on the presser foot for directing a jet of air under pressure between the bevelled edge of the pressed foot and flap towards the advancing flap to raise the flap for entrance of the presser foot.

7. A sewing machine of the McKay type for operating upon work provided with a seam concealing flap having, in combination, a straight hook needle, a rotary work supporting horn, a presser foot, a feed point acting on the side of the work engaged by the presser foot to feed the work, and means comprising a tubular conductor for directing a jet of air under pressure against the work to raise the flap in advance of the point of operation of the needle.

CLIFFORD ROBERTS. JOHN M. WHELTON.

Images