US2180227A - Soling machine - Google Patents

Description

Nov. 14, 1939. A EHRESMANN ET AL 2,180,227

SOLING MACHINE Filed April 2, 1938 lnveniar's;

Patented Nov. 14, 1939 UNITED STATES PATENT OFFICE SOLING MACHINE Application April 2, 1938, Serial No. 199,568 In Germany August 19, 1936 2 Claims.

Our invention relates to sewing machines for soling boots and shoes, particularly to a presser foot for soling machines having a circularly bent needle oscillating along its arc, in which the needle is supported and guided from the outside by a correspondingly bent flange of the presser foot. Whereas the known presser feet of this type are closed on both sides by an arm supporting the said flange, the presser foot according to our invention is closed by such an arm only on that side from which the work is moved forward, while on the other side it is open, the said flange terminating there approximately in the plane of the lateral face of the needle holder.

This asymmetric one-sided open construction of the presser foot facilitates exact sewing at the curved parts of the soles. This is due to the fact that the said flange together with the baseplate of the presser foot projects only a little over the plane of the needle towards the side towards which the work is moved forward and therefore when sewing these parts of the soles the edges and angles of the flange and of the base-plate that are on this side do not, by striking against the upper damage the work or prevent the same from making the necessary turn when it is being guided so closely along the presser foot that the base-plate of the latter engages as far as the apex of the angle between the upper and the welt of the sole, in order that the needle should prick through the welt at a sufficient distance from the edge of the sole, namely close beside the upper.

The described construction of the presser foot permits also the provision within the presser foot of a movable body which is pressed by a spring continuously against said flange and supports said needle from the inside thus preventing it from straightening and preserving it from breaking in its upward movement out of the work. Preferably the said body is formed by a wad of felt or the like impregnated with lubricant thus lubricating said needle as it oscillates.

In the accompanying drawing Fig. 1 is a front elevation of a presser foot according to our invention together with a'corresponding needle holder, partly (above the line A-B) in cross-section, and

Fig. 2 is a side elevation of the same.

Referring to the drawing, the needle a is clamped into the needle holder 1), which is loosely mounted on the axle c and is oscillated from the driving shaft by means of a crank and a connecting rod. The presser foot, which is likewise loosely mounted on the axle c, is formed by an arm d mounted adjacent the needle holder b at right angles to the axle c, a flange e of, the arm (2 disposed parallel to the axle, and a plate F disposed adjacent the lower end of the flange and angularly to the latter, the plate F being secured to the arm d by a curved arm 9. The flange e is formed with a longitudinal slot h for the passage of the sewing thread and also, on the inside, with a longitudinal groove 2' in which the needle a reciprocates and which thus forms the needle guide. The plate F having a hole for the passage of the needle 04 forms the base-plate of the presser foot.

The flange e terminates on the side opposite the arm d approximately in the plane of the lateral face of the needle holder 1). The presser foot is thus open on this side and for the most part lies on the other side of the plane C-D of the needle.

In the presser foot there is provided a wad k of felt or the like impregnated with lubricant; this wad is carried by one end of a helical spring I mounted on the hub .of the needle holder 1), and is pressed by said spring continuously against the flange e and on the plate F and thus delivers part of the lubricant to the needle as it oscillates.

What we claim as our invention and desire to secure by Letters Patent is:

1. In a soling machine a circularly bent nee dle oscillating along its arc, a needle holder, a presser foot open on one side mounted adjacent said needle holder and having a correspondingly bent flange supporting and guiding said needle from the outside, a movable body provided within said presser foot, said body being pressed by a spring continuously against said flange and thus supporting said needle from the inside. I

40 2. In a soling machine a circularly bent nee dle oscillating along its arc, a needle holder, a

presser foot open on one side mounted adja- ADAM EHRESMANN. LU'DWIG SI'REIBEL.

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