US2211333A

US2211333A - Welt seam presser foot

Info

Publication number: US2211333A
Application number: US288252A
Authority: US
Inventors: Lang John
Original assignee: Individual
Current assignee: Individual
Priority date: 1939-08-03
Filing date: 1939-08-03
Publication date: 1940-08-13
Anticipated expiration: 1957-08-13

Description

Aug. 13, 1940. LANG 2,211,333

WELT SEAM PRESSER FOOT Filed Aug. 3, 1939 2 Sheets-Sheet l JOHN LANG INVENTOR.

A TTORNEY.

Aug. 13, 1940. LANG WELT SEAM PRESSER FOOT Filed Aug. 3, 1959 2 Sheets-Sheet 2 JOHN LANG I NV EN TOR.

A TTORIVE Y.

Patented Aug. 13, 1940 UNITED STATES PATENT OFFIE 3 Claims.

This invention relates to improvements in presser feet for sewing machines and more particularly to those which are used when sewing a strip of welting cord onto slip covers, cushions and articles of upholstery to provide welt seams therein.

An object of this invention is to provide an improved mounting for a plurality of welt seam roller gauges, respectively positioned in the front and rear of the needle.

Another object of this invention is to provide a presser foot having welt seam roller gauges adapted for operating on welt seams having various sizes of circular cords therein.

Another object of this invention is to provide a presser foot having a welt gauge pivotally mounted thereon and having a spring fastened to the presser foot and in engagement with an arcuate portion of the gauge to permit rocking motions of the gauge when passing over seams, while being adapted to resiliently maintain the said gauge in forced contact with the fabric being o erated on.

Another object of this invention is to provide a combined pivotal and resilient supporting means for a circular welt seam gauge whereby said gauge is slightly movable vertically while resiliently downpressed when passing over seams and may also be pivotally raised a considerable distance for operating on welt seams having cords of large diameter.

This application is a continuation in part of my application Serial No. 269,322, filed April 22, 1939.

With the above and other objects in view, the invention will be hereinafter more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawings and pointed out in the claims which form part of this specification.

Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which:

Figure 1 is a front elevation of the welt seam presser foot.

Figure 2 is a side elevation of the presser foot.

Figure 3 is a top plan view of the presser foot removed from the presser foot bar.

Figure 4 is a view of the presser foot in operation on a sewing machine cloth plate and showing how a welt seam having a cord therein is guided by the gauge.

Figure 5 is a side elevation of the presser-foot, facing the pivotal arm, the gau e mounting being in section and showing an elongated vertically disposed guideway providing for slight up and down movements.

Figure 6 is a detailed view, partly in section, of mounting means for the gauge. #5

Figure '7 is a front elevation of a modified welt seam presser foot providing horizontal adjustments of the gauge.

Figure 8 is a front elevation of an improved roller gauge welt seam presser foot.

Figure 9 is a side elevation of the presser foot shown in Figure 8.

Figure 10 is a top plan view of the improved roller gauge presser foot, removed from the presser foot bar. 115

Figure 11 is a side elevation of the improved presser foot, facing the pivotal arm.

Figure 12 is a side elevation of a modified presser foot having an elongated vertically disposed guideway providing for slight up and down movements of the rear roller.

In the illustrated embodiment of the invention, the numeral l0 indicates a presser foot having a shank H which is suitably adapted at its upper end to fit the lower end of a presser foot bar l2. The presser foot ill may be secured to the bar lfby a screw 13 threaded into the bar.

The presser foot shank H has a downwardly and forwardly extending arm M. The arm has a transverse aperture H5 at its free end. 3-0

A gauge [6 of circular form and having a centrally positioned transverse aperture I! has been rotatably mounted on a screw 18 in the aperture I5. The gauge l 6 has a centrally positioned boss I 9. The cross-section of the gauge at the boss l9 is arcuate.

The gauge Iii terminates ahead of the needle aperture 20 in the presser foot. The gauge I 6 has an annular portion 2| centrally thereof on the side opposite the boss [9. '4T

A wire spring 22 has been secured to the arm M in permanent intimate union such as by brazing. The spring 22 has a circular portion 23 at its free end in engagement with the annular portion 2! of the gauge, and serves to resiliently maintain the gauge in pressure contact with a sewing machine cloth plate 24.

It is to be noted that suitable means may be provided for horizontal adjustment. of the gauge in relation to the presser foot, such as by mount- .ing a spacing washer on the screw I8.

The body of the screw IB is in engagement with, the side walls of the aperture I 5, which is directed in a generally vertical plane. The mounting of thegauge axisin the. elongated upright aperture l5 permits slight upward and downward motions of the gauge when passing over seams.

As shown in Figure 5, the arm M has been pivotally mounted on a pin 25 suitably secured in the shank l l. The arm M may be swung about the pin 25 so as to raise the gauge [6 considerably and permit operation on welt seams having large diameter cords. In practice, the gauge is adapted for use on welt seams on articles of upholstery wherein the diameter of the cord 28 may vary from one-eighth to one-quarter of an inch.

In making pivotal adjustments about the pin 25, the body of the screw l3 passes through an arcuate slot 26 in the arm M. The head of the screw i 3 is utilized to clamp the arm l4 against the shank H.

In operation the circular form of the gauge makes it possible to turn the material worked upon at right-angles with ease, an operation which cannot be done with non-circular gauge means.

As shown in Figure 6, the screw 18 has a nonthreaded portion 29 which is slightly wider than the thickness of. the arm i l, thus providing a slight clearance between the head of the screw and the arm, which permits the roller and the screw to move slightly up and down in relation to the arm.

Figure '7 shows a modified presser foot 30 having a rectangular recess (not shown) in the shank I l and in which a slotted arm BI is slidably mounted horizontally and crosswise of the line of stitching. A screw 33 in engagement with a slot 32 in the arm 3! provides means for adjusting the position of the gauge 56 to and from the presser foot and the needle. The arm 3i has an angular extension 34 carrying the pivot pin 25 and a screw 35 for angular adjustment of the gauge carrying arm 36. The screw 35 is positioned in an arcuate slot (not shown) but similar to the slot 26. The horizontal adjustment of the gauge makes it possible to operate on welt seams having various sizes of cords therein with a single gauge and with precision.

As shown in Figures 8 to 12, I have provided an improved welt seam presser foot 46 having two roller gauge means, a roller ll which is placed in front of the needle and a roller 42 placed at the rear of. the needle. The presser foot it) has a shank 53 secured to the presser-bar l2 by a screw l3.

The presser foot 45) has a downwardly and forwardly extending arm M. The roller 4! has been rotatably mounted on a screw 45 in the arm 44. The roller H has a centrally positioned boss 46. The roller l is positioned ahead of the needle aperture 4'5 in the presser foot.

As shown in Figure 11, the arm 44 has been pivotally mounted on a screw 48 suitably secured in the shank 413. The arm 44 may be swung about the screw :8 so as to raise the roller considerably and permit operation on welt seams having large diameter cords. It is to be noted that the forward roller gauge is raised slightly higher than the rear roller gauge, as this difference in height facilitates the folding of the material around the cord at the front roller gauge when making welts, while the rear roller gauge holds the welting in tight engagement.

In making pivotal adjustments about the screw &3, the body of a lower screw 49 passes through an arcuate slot 59 in the arm i l. The head of the screw 69 is utilized to clamp the arm 44 against the shank 33.

The presser foot 40 has a rectangular recess (not shown) in the shank 43 and in which a slotted arm 5! is slidably mounted horizontally and crosswise of the line of stitching. A screw 52 in engagement with a slot 53 in the arm 5| provides means for adjusting the position of the roller 4! to and from the presser foot and the needle. The arm 51 has an angular extension 54 carrying the pivot 48. The screw 49 serves for angular adjustment of the roller carrying arm. The screw 39 is positioned in the arcuate slot 50. The horizontal adjustment of the roller gauge makes it possible to operate on welt seams having various sizes of cords therein.

The roller gauge 42 is mounted on a screw 50 in the arm 44 and is positioned rearwards of the needle aperture 47.

In operation, a strip of stitched preformed welt cord is stitched to a sheet of fabric. The back roller 42 serves to keep the welt cord in such relation with the needle that the stitching will be in direct superposition over the welt cord stitching. I have found in practice that with the use of only the front roller 4| that the welt cord moves away from the needle, resulting in uneven stitching which does not make a symmetrical appearing junction. As shown in Figure 10, the back roller gauge is narrower than the front roller gauge so as to provide room for the needlecarrying-bar (not shown) from striking the back roller gauge.

Figure 12 shows a modified presser foot 55 having an elongated vertically disposed aperture or guideway 56 in the arm 51. The body of the screw 53 functions as an axis on which the rear roller 58 is rotatably mounted. The body of the screw 58 is in engagement with the side walls of the aperture 56 so as to permit slight upward and downward motions of the roller 59 when passing over seams.

A wire spring 69 has been secured to the arm 57 with its free end resting on the body of the screw 58 and serves to resiliently hold the roller gauge 59 in pressure contact with the work. The screw 6! permits vertical adjustments of the arm 51.

It is to be noted that instead of mounting my welt seam roller gauge attachment on the left side of the shank, that I may mount it on the right side of the shank. It is also to be noted that all the rollers are freely rotatably mounted on their respective axes.

In accordance with the patent statutes I have described and illustrated a number of embodiments of my invention, but it will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claims.

I claim:

1. In a welt seam presser foot for sewing machines having a needle, comprising a shank having a downwardly and forwardly extending arm mounted thereon, a welt seam roller gauge rotatably mounted at the free end of said arm, the portion of said roller gauge in transverse contact with the material worked upon having an arcuate contour, an auxiliary roller gauge rotatably mounted on said arm rearwards of said needle, the portion of said auxiliary roller in transverse contact with the material worked upon having an arcuate contour and being narrower than said first mentioned roller, said auxiliary roller being designed to hold the stitching of a finished welt seam in alignment with said needle, and means for manually raising and lowering said arm to permit said gauge to operate on welt seams having various sized cords therein.

2. In a welt seam presser foot for sewing machines having a needle, comprising a shank having a rectangular recess, a slotted arm slidably mounted in said recess, said arm being positioned horizontally and crosswise of the line of stitching, said arm having a right-angular rearward extension, a downwardly and forwardly extending arm mounted on said extension, a welt seam roller gauge rotatably mounted at the free end of said arm, the portion of said roller gauge in transverse contact with the material worked upon having an arcuate contour, an auxiliary roller gauge rotatably mounted on said arm rearwards of said needle, the portion of said auxiliary roller in transverse contact with the material worked upon having an arcuate contour and being narrower than said first mentioned roller, said auxiliary roller being designed to hold the stitching of a finished welt seam in alinement with said needle, and means for manually raising and lowering said arm to permit said gauge to operate on welt seams having various sized cords therein.

3. In a welt seam presser foot for sewing machines having a needle, comprising a shank having a downwardly and forwardly extending arm, said arm having an elongated upright aperture, welt seam roller gauge means guided for vertical movement by said aperture, the portion of said roller gauge means in transverse contact with the work having an arcuate contour, a spring secured to said arm, said spring having a portion at its free end designed to resiliently contact said roller gauge means to permit slight vertical motions of said gauge means, said spring being adapted to resiliently maintain said roller gauge means in pressure contact with the material being welt seamed, and means for manually raising and lowering said arm to permit said roller gauge means to operate on welt seams having various sized cords therein, said presser foot having an elongated flat bottom surface permanently in contact with the work.

JOHN LANG.