US2902958A - Presser foot for sewing machines - Google Patents

Description

Sept. 8, 1959 M. T. VOIGT 2,902,958

PRESSER FOOT FOR SEWING MACHINES Filed Oct. 25, 1957 INVENTOR M P x T. \IOIGT l /MM ATTORNEY United This invention relates generally to presser foot devices for sewing machines and more particularly to improvements in auxiliary lateral guides therefor of the type shown and described in my prior United States Letters Patent No. 2,487,285, granted November 8, 1949.

The compensating presser foot of the present invention includes a pair of presser shoes that are operative to facilitate sewing a strip or panel to an underlying main body of fabric along a line which is closely adjacent a free edge of the strip or panel, and an auxiliary lateral guide or stripper that is operative to facilitate sewing a second and more remote line of reinforcing or decorative stitching which is parallel to the first line of stitching. Known stripper arrangements have not proven to be entirely satisfactory because after one edge of the strip or panel has been stitched, the presser foot is raised only slightly and the work shifted laterally under the presser foot to position the opposite edge of the work thereunder, and normally the stripper remains spring pressed downwardly upon the fabric, bearing thereon with suflicient force to cause bunching of the fabric against one side of the stripper as the work is shifted, in consequence of which some delicate materials are damaged. Accordingly, a principal object of the present invention is to provide means for controlling movement of the stripper so as to secure the same against bearing with undue force upon work shifted laterally thereunder.

Another principal object of the present invention is to provide such means for assuring that the stripper is elevated a distance at least sufficient for clearing the panel being sewn when the presser foot is raised, and which may be adjusted to facilitate sewing panels differing in thickness.

Other objects and advantages of the present invention will appear more fully hereinafter, it being understood that the invention consists substantially in the combination, construction, location and relative arrangement of parts, all as described in the accompanying drawings and as finally pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side elevation of an exemplary compensating presser foot constructed in accordance with and embodying the principles of the present invention.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is a vertical section on line 3-3 of Figure 4.

Figure 4 is a horizontal section on line 44 of Figure 3.

Figure 5 is a vertical section on line 5-5 of Figure 4.

Figure 6 is a vertical section on line 66 of Figure 5.

Figure 7 is a perspective view of the stripper only.

Referring to the drawings, the exemplary presser foot constructed in accordance with and embodying the principles of the present invention includes a shank 10 that has formed upon its lower end a relatively broad yoke 11, which has a pair of parallel horizontally extending downwardly facing channels 12 and 13 separated by a web 14, the channel 12 being embraced by the web 14 and a side wall 15, and the channel 13 being embraced by the web 14 and a side wall 16.

atent 2,902,958 Patented Sept. 8, 1959 ice side within the larger channel 12 and conjointly carry an auxiliary presser shoe 21, the shoes 18 and 19 being in turn carried by the portion of the pivot pin 17 that spans the channel 12, and being spring pressed downwardly, as shown. Any suitable arrangement of the compensator foot parts that are housed within the channel 12 may be utilized, but as illustrated, the arrangement is identical with that of the pertinent embodiment which is disclosed in my pending application for United States Letters Patent, Serial No. 581,084, filed April 27, 1956, now Patent No. 2,887,969, granted May 26, 1959, to which patent reference may be had for additional details.

Disposed within the smaller channel 13 is the lateral guide member or stripper 20 the channel-embraced portion of which is transversely bored, as at 22, to permit the projection of the supporting pivot pin 17 therethrough. A channel-embraced portion of the stripper 20 is recessed, as at 23, for accommodation of a coiled compression spring 24 that exerts a normal bias on the stripper 20 in advance of the pivot pin 17 tending to maintain the forwardly extending portion of the guide element depressed, as best shown in Figure 3 by broken lines. In the depressed condition of the stripper 20, the inner flat side of the stripper serves as an auxiliary guide for producing a second line of stitching spaced inwardly from the initially sewed edge of the top strip or panel, i.e., in the operation of the presser foot of the present invention, the spring-presssed auxiliary guide member or stripper 20 serves as a lateral guide against which an edge of the work to be stitched may be held as it is fed through the sewing machine head. conventionally, to produce the first line of stitching the work is fed through the presser foot wtih an edge of the strip or panel bearing against the inner side of one of the presser shoes. And to produce the second line of stitching the initially stitched work is again passed through the presser foot, this time with the sewed edge of the top strip bearing against the auxiliary guide member or stripper 20.

For controlling the stripper 20, a screw, designated 25, is threaded downwardly through the base wall of the channel 13, and the inner end of this screw is brought to bear upon the top of the stripper 20 to the rear of the pivot pin 17, as shown. The screw may be turned more or less into the channel 13 to thereby limit downward swinging movement of the fore end portion of the stripper 20 about the pivot pin 17 under the influence of the spring 24.

Preferably the screw 25 is threaded into the channel 13 a distance sufiicient so that when the presser foot is raised the customary distance to release the work, preliminarily to shifting the same laterally under the presser foot, the lowermost stripper portion is elevated at least to the upper surface level of the panel being sewed, in consequence of which if the panel is not already under the stripper 20, it may be shifted laterally and inserted thereunder without the edge of the panel fouling the inner side of the stripper, and if the panel is already under the stripper 20, the work may be shifted laterally thereunder without such undue pressure from the stripper as to cause the fabric to bunch up against the side of the stripper, or as to cause damage to material that is light in weight or delicate in texture or finish.

It will be understood, of course, that the present invention is susceptible of various changes and modifications which may be made from time to time without departing from the real spirit or general principles thereof, and it is accordingly intended to claim the same broadly, as well as specifically, as indicated by the appended claims.

What is claimed as new and useful is:

1. In a sewing machine presser foot having a supporting shank terminating in a depending yoke, a pivot pin carried by said shank and spanning said yoke, a presser shoe and an adjacent edge guide element embraced by said yoke and mounted upon said pin for independent movement relative to one another, spring means operative upon said guide element to impart a normal bias thereto tending to turn the same upon said pivot pin in a direction for depressing the fore end portion thereof, and separate means carried by said yoke and adjustable relatively thereto for selectively limiting the downward pivotal movement of the fore end of said guide element about said pivot pin, said edge guide being mounted upon said pivot pin solely for rotational motion about said pin. 2. A sewing machine presser foot as defined in claim 1 wherein spring bias is applied to the edge guide member in advance of the pivot pin, and the movement limiting means is an element threaded through the base wall of the yoke and adapted for being turned more or less downwardly into the yoke for abutting the top of the edge guide member at a point to the rear of said pin.

References Cited in the file of this patent UNITED STATES PATENTS 1,198,780 Seymour Sept. 19, 1916 1,943,203 Chudner Jan. 9, 1934 2,487,285 Voigt Nov. 8, 1949

Images