US1036845A - Presser-foot for sewing-machines. - Google Patents

Description

R. K. HGHMANN. PREssER FOOT PoR SEWING MACHINES.

APPLICATION FILED NOV. 9, 1910.

1,036,845,V Patented Aug.27,1912

. /4 77,1., F729. 4f lul-mmm RICHARD K. HORMANN, OF SAN DIEGO, CALIFORNIA.

PRESSER-FOOT FOR SEWING-MACHINES.

Application filed November 9, 1910.

To all whom t may concern Be it known that I, RICHARD K. HORMANN, a citizen of the United States, and resident of San Diego, in the county of San Diego and State of California, have invented certain new and useful Improvements in Presser-l Feet for Sewing-Machines, of which the following is a specification.

This invention relates to a presser foot for sewing machines, and it has been my ob-`v ject to make a presser foot which will so distribute the pressure upon the goods being operated on as to cause the material or the goods to be fed forward by the feed bar uniformly without doubling or puclering even where the material is very flimsy or light.

The novel features of theinvention will be.` apparent from the following description taken in connection with the accompanying drawings.

In the drawings,-Figure 1 is a side view of my presser foot together with the associated parts of a sewing inachineyFig. 2 is a similar view with the feed bar in its lowered position; Fig. 3 is a detail perspective view of the presser foot; Fig. 4; is an en larged longitudinal section of the presser foot; and `Fig. 5 is a plan view showing the feed bar in dotted lines.

I have found that in using an ordinary presser foot particularly on very thin material, there is likely to be puckering of the material so that a smooth seam is not formed, and I have discovered that this puckering can be prevented by applying somewhat greater pressure on the material immediately in the rear of the needle bar, so that the feed bar will have a better grip on the material at this point. I have therefore made the presser foot with a movable and yielding part in line with the needle passageway and in the rear thereof, so as to secure greater pressure at that point.

In the drawings, 1 represents the har which is yieldingly pressed downward in the sewing machine, and which carries at its lower end the presser foot 2.

3 represents the throat plate which has in it the opening 4t beneath the presser foot, in which opening works the feed bar 5 which Ymay be of usual form. This feed bar is made up of longitudinal rows of teeth facing in the direction in which the cloth is to be fed, and the central row being shorter than the side rows. This feed bar is given Specification of Letters Patent.

`Patented Aug. 27,1912.

Serial No. 591,499.

longitudinal movement and also the usual up `and down movement by any usual connection, such as t-he bar 6.

The presser foot, as shown in the drawi ings, is made up of a body portion having a longitudinal slot in its forward part to provide a passageway for the needle, and in the particular forni shown the rear part has a slot S as a convenient means for attaching it to the lower end of the bar 1. Immediately in the rear of the slot 7, and in the lower face of the presser foot I `form a groove 9 longitudinally of the presser' foot and in line with the slot. In this groove I place a small piece or plate 10 which has the rounded forward and rear edges, and which is adapted to be pressed up into the groove so that its lower face will be flush with the lower face of the presser foot. The limit of the inward movement of the plate is reached when it strikes the bottom of the groove 9 and at that time its face is flush with the balance of the presser foot. Two pins 11, 12 are attached to this piece 10 and extend upwardly through the presser foot, being connected above the presser foot by the bar 13. Thus the pins guide the piece l0 in its up and down movement, and the connecting bar 13 serves as a stop to limit the downward movement of the piece. A U-shaped spring 14 is secured at its ends on opposite sides of the slot 7 extending to the rear and bearing on top of the connecting piece 13, so as to tend to hold the plate 10 in its lowered position, as shown in Fig. 4.

It will be observed that the yielding plate 10 will bear down on the material directly in the rear of the needle, and it will coperate with the short central row of teeth 15 in feeding the material forward, and thus the material will be pressed against the short row of teeth with greater pressure than against the long side rows. The result of this is that the central portion of the material immediately behind the needle is fed forward at the same speed as the portions at `the side, and there will be no puckering even sage-way for the needle in advance of the rear portion thereof, and means at the rear of said passage-way and in line therewith for exerting greater pressure upon the portions of the material containing stitches than on those portions of the material under the presser i'oot at the sides of the stitches.

2. A presser foot for sewing machines comprising a body portion havingy a passage-way for the needlevin advance of the rear portion thereof, Vand yielding means at the rear of said passage-way and in line therewith for exerting greater pressure upon the portions of the material ,containingY stitches than on those portions of the material under the presser foot at the sides of the stitches. t v

3.y A presser foot for sewing machines comprising a rigid body portion adapted to engage the clot-h having a passage-way for the needle, and having rigid rear side eX- tensions, and a central spring pressed portion at the rear of said passage-way and in o line therewith between said rear extensions, the said spring pressed port-ion normally projecting below the lower surface ofsaid presser ioot under the iniuenoe ,of the spring andradapted to be pushed back only so far as to be flush with said ysurface and tending,v atall timesA to project downward under the inuence of the spring. l

4'. A presser foot forv sewing machines,

I ycomprising a rigid body portion provided with a longitudinal slot in the forward part for the needle and-a groove in the under surface in line with said slot at the rear, a movable piece fitting iny said groove and adapted to occupy a position flush with said under surface when pushed inward to the limit of its movement, yielding means operative at all times for pressing said movable piece downward, and means for limiting the downward movement of said piece.

5. A presser foot for sewing machines comprising a body portion provided with a longitudinal slot in the forward part for the needle and a groove in the under surface in line with said slot, a movable piece fitting in l said groove and adapted to occupy a position Hush with said under surface, guide pins on said piece extending through said resser foot a connectin iece for said ainsA t above said presser foot serving as a stop,

anda spring bearing down on said connecting piece.

In testimony whereof I 'affix my signature in presence of two Witnesses.

RICHARD K. HOHMANN. Witnesses ARTHUR L. BRYANT, Lou HosKINsoN.

copis of this patent may b'obti'ned fr re .centi 'acli. Bi addressing` th Commissioner of Patents, washington, n. c.

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