US948100A - Presser-foot. - Google Patents

Description

G. A. POTTER.

' PRBSSBB. FOOT.

- u'ruoa'uox 21mm JUHE m, 1909.

948,100. Patented Feb.1,19 10.

CHARLES A. POTTER, 0F LAKIEPORT, NEW HAMPSHIRE.

PlEtESSER-FUOT.

alaioo.

specification of Letterslatent.

Patented T eb. l, 191W.

Application filed June 10, 1909. Serial No. 501,383.

To all whom it may concern:

Be it known that T, CHARLES A. Porrnn, a citizen of the United States, residing at Lakeport, in the county of Belknap and State of New Hampshire, have invented certain new and useful Improvements in Presser-Feet, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to improvements in presser feet for sewing machines and more particularly to those which are used when sewing upon material having a smooth, hard surface such as patent leather.

In stitching toe caps and other portions of patent leather shoes it is necessary to oil the leather before it is placed in the machine or to supply oil beneath the presser foot while sewing in order to permit the work to be properly performed. The frictional contact between the smooth bottom face of the ordinary presser foot and the hard, smooth surface of patent leather, together with the suction between these parts, and more especially when the patent leather toe cap is provided with the usual perforations, causes said parts to bind and not slide easily upon each other, hence the necessity of the use of oil grease, or other lubricant.

It is the object of my invention to provide an improved presser foot which will not require the oiling or lubricating of the patent leather and this object is attained by forming in the bottom face of the presser foot one or more notches or grooves which will break the suction and reduce friction.

With the above and other objects in View, the invention consists of the novel features of construction and the combination and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings, in which- Figure 1 is'a perspective view of a well known form of presser foot having my invention embodied therein; Fig. 2 is an edge view of the presser foot; and Fig. 3 is a bottom view.

In the drawings 1 denotes a presser foot having a broad, fiat, horizontally disposed base portion 2 and an upright portion 3 which may be attached in any suitable manner to the presser bar indicated in dotted lines, as at B. As illustrated, said portion 3 is of split tubular form to receive a presser bar and adapted to be clamped thereon by a screw l. The presser foot illustrated is especially adapted for use on a machine for sewing four rows of stitching in a toe cap of a shoe and its base portion 2 is provided with two offset openings 5, 6 for the needles. The outeror front end of the base 2 is also .upturned and beveled, as shown at 7, so that the material will be properly guided. The presser foot is also provided upon one side with a gage portion or bar 8 having a lateral shank 9 slidable in a transverse Igroove 10 in the top of the base 2 and formed with a longitudinal slot 11 to receive a clamping and adjusting screw 12.

In the practice of my invention, I form in l the smooth, flat, bottom face of the base portion 2 of the presser foot one or more transverse grooves 13, and when the presser foot has the gage S the latter is provided with a similar groove 14: which is similarly disposed, as clearly shown in Figs. 2 and 3. These grooves are substantially V-shaped in cross section and are disposed in rear of the needle openings 5, 6 so that said base portion of the presser foot will not have a continuous or unbroken smooth bottom face to cause suction as it passes over the perforations in the patent leather toe cap. The formation of the grooves also reduces the area of the presser foot base portion which contacts the patent leather and hence reduces friction. I have found in practice that presser feet constructed in accordance with the invention will not need the patent leather to be oiled prior to being placed in the machine nor during the sewing operation.

While I have shown and described the invention as embodied in a particular kind of presser foot and gage, it will be understood that it may be embodied in presser feet of other forms and constructions.

Having thus described the invention what is claimed is:

1. The combination with a presser foot having a smooth, flat bottom formed with a transversely extending groove, of a gage carried by the presser foot and having a bar disposed to one side of the presser foot and formed with a flat bottom disposed in a plane below the plane of the bottom face of the presser foot and containing a transverse groove disposed opposite the groove in the bottom of the presser foot, as and for the purpose specified.

use in sewing patent leather tips on patent leather shoe uppers, consisting of an attach- 2. The herein described presser foot for ing shank with means for securing it to a presser foot bar, a rectangular base portion projecting from the shank and having a smooth, flat bottom face, and an angularly disposed and upwardly curved and tapered forward end, said flat bottom face of the base being formed with a transversely extending V-shaped groove adjacent the rear portion of said base, the intermediate portion of the latter being formed with two needle holes,"a gage having a shank transversely adjustable on the top portion of the base, and a longitudinally extending rectangular gage bar disposed to one side of the base of the presser foot and having a flat bottom face CHARLES A. POTTER.

Witnesses:

WELLS G. HADLEY, WILLIAM H. CoLBA'm-I.

Images