US2581603A - Presser foot for sewing machines - Google Patents

Description

Jan. 8, 1952 J. L. ROCKERATH 2,581,603

PRESSElR-FOOT FOR SEWING MACHINES Filed June 14, 1950 2 SHEETS-SHEET l 3 amine y J- L. RQCKERATH PRESSER-FOOT FOR SEWING MACHINES Jan, 8, 1952- 2 SHEETS-Si-IEET 2 Filed June 14, 1950 June i Jkn ZJE'asZemflz (WI/Zine Patented Jan. 8, 1952 UNITED STATES PATENT OFFICE DRESSER FOOT FOR SEWING MACHINES John L. Rockerath, Utica, N. Y., assignor to The Singer Manufacturing Company, Elizabeth, N. .L, acorporation of New Jersey Application June 14, 1950 ,-Serial hid-168,015 gs c'1aas;' 1. 12 2w ciprocatory curved eye-pointed needle I15 and an under or needle loop-taking thread-carrying looper l6 and an overedge looper or loop spreader I! which cooperates with the needle and looper in the formation of overedge stitches. Inasmuch as all of the above mentioned elements are common to overedge sewing machines :and form no part of the present invention, detailed illustration and description thereof is deemed unoperation, is at the same time most inexpensive of manufacture.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilledin the art.

In the drawings, n Fig. 1 represents a fragmentary side elevation invention is incorporated.

necessary.

. At;the forward portion of the presser-bar hi there is provided a stud I8 which projects at right angles to the adjacent face of the bar or at right. angles to the direction of feed of the machine when the shank is in its operative position. The stud [8 may be termed an axial stud, inasmuchas it provides a support upon which the presser-foot I3 is secured and about m. which it has a rocking or tilting motion. Ap-

' Fig. 2 represents an enlarged plan view of the Fig. 4 represents a bottom planview of the:

presser-foot disclosed in Fig. 2. Y

Fig. -5 represents a right side elevation view of the presser-foot.

Fig. 6 represents an exploded view of the presser-foot and its component parts.

Fig. '7 represents a left side elevation view of the cord-guiding element which forms a part of the present presser-foot.

Fig.8 represents a front elevation element disclosed in Fig. 7.

Referring more specifically to the drawings,

view of the the invention is. disclosed as embodied in an over-- edge sewing machine having a frame 10, worksupporting plate ll, work-feeding mechanism including a feed-clog l2, a presser-foot l3 carried by a presser-bar l4 and overlying the feed-dog r ma ng rt-in WQ FKQLQEW HL and'stitch forming mechanism including a reproximately midway of its length, the presserfoot 13 is channeled at right angles to the length of .the foot as at I9, to receive the lower edge of. the shank. stud I 8 which is semicircular in cross section. The channel or hearing I9 is semi circular'in cross section but is of somewhat less depth than the radius of the lowered'ge of the stud in order that the presser-foot may rock upon the stud. The edge 20 of the stud opposite the semicircular edge, is'engaged by the free end of a cap 2| secured to the presserfoot in advanceof the channel I9, by a screw 22, a block '23 being preferably interposed between the cap and the foot and held by the same screw. The cap 2| which may be in the the presser-foot in close contact with the stud,

the-latter being held snugly in its seat in the channeL but not so tightlyclamped as to pre vent the rocking or tilting of the foot upon the stud. 'Th'e stud is formed at its outer end with ahead 24., the space between which and the shank portion isso well filled by the free end of'the cap 2| as to prevent side play of the foot relative'to the shank M.

-The cap 2| may be secured directly to the upper faceof the foot but the block 23 is preferably interposed and preferably carries or is made integral with a presser-foot chaining-off finger 25 around which the overseam stitches are formed and from off the end of which they slip, as the work is fed through the machine.

For amore'detailed disclosure of the presserfoot carrying means, reference may be had to the;UpitedStates.Knaus Patent No. 2,419,494, April 22, 1947.

portion of the work is uncurled or smoothed before it reaches the trimming area. Cooperatingwith the projecting uncurling member 3! is an auxiliary member in the form of a block 32 which is adapted to be secured within the slot 28 by means of a screw 33 which projects through an at the upper forward portion of the auxiliary block 31 while its lower or exit end 44 is provided at the lower portion of the block so that it will break through the sole portion 38 of the block. Referring particularly to Fig. 2 it will be observed that the thread-guiding passageway 42 is contained within a vertical plane which is-disposed inparallelism with the longitudinal axis of the presser foot proper, or it might also be said that this plane is disposed in parallelism with the direction of work feed. However, it

' desired, the longitudinal axis of the passageway could- ,beinclined with respect to this vertical "pane; of the cord' guiding'passageway is in substantial Stillrferri'ng to Fig. 2, the exit end 44 alignment with the path of needle reciprocation so that the cord 45 which is guided therethrough aperture 34 formed in the block so as tobe. re-,

ceived within the forward threaded aperture 3i; of the sole plate. It is to be particularly noted that one end portion otithis block is provided with a curved member 35 which cooperates with the primary 'uncurling member 3| in the V smoothing or uncurling of the work.

The above mentioned block 23- is adapted to be secured within the presser-foot notch 28 between the bearing channel [9 and the uncurlin block 32 by means of the screw 22 which enters an aperture 36 formed in the block to the end that it. may be threaded in the second sole-plate aperture 29. As hereinabove noted, the'screw 22 which secures the block 23 upon the sole plate also functions to hold the cap 2| in place over the .presser-bar stud IB..

Referring particularly. to. Figs. 4 tov 8, inclusive, the block 23 may be termed. a primary block for, upon its right hand end portion, there is formed integrally a secondary block or shoulder 31 which overhangs the longitudinal side portion 3! or the sole plate 26 so as to provide a sole portion 38 which is disposed in flush relation with the bottom portion of the sole plate proper. As may be best observed from Figs. 2 and 4,. the rearward portion of the auxiliary block 3'! is provided with the chaining-off finger 25 which is disposed in longitudinally spaced relation with the above noted longitudinal side portion 3! of the IiIIGSSGI-a foot, thereby to define therebetween a needle-,.

receiving slot. As may be observed from Fig. 2

the thread-carrying needle reciprocates within this slot in the formation of stitches. Still referring to Figs. 2 and 4, it will be. observed that the chaining-elf finger extends outwardly.

beyond the exposed vertical wall portion 39 of the secondary block 31 so as to form a knife-receiving notch 40. Referring particularly to Figs. 1 and 2, it will be observed that a knife blade 4!, which functions to trim the edge portion of the work piece, is adapted to reciprocate within this notch formed in the auxiliary block 31. For a complete. disclosure of this type of trimming knife reference may be had to the United States Knaus:

Patent No. 2,247,127, June 24, 1941.

Referring to Fig. 2, the projecting portion of the chaining 01f finger 25'cooperates with the projecting portion of the auxiliary uncurling device 35 to form in conjunction with the exposed. vertical wall 39 of the auxiliary block 31, a three-i; sided notch in which the upper cutting blade I ing passageway has its entrance and 43 disposed will be penetrated by the needle [5 to the end that the cord 45'will be secured to the base material '46 by means of the overedge stitches 41. Actually the exit end 44 of the cord-guiding passageway 42 is positioned in direct alignment with the needle-receiving, slot so that it is disposed between the longitudinal side portion 3| of the sole plate and the chaining-oil finger 25.

From Fig. 2 itwill be readily appreciated by A those skilled in the art that the present auxiliary block 31 with its cord-guiding passageway 42 functions to direct a .cord or tape 45 directly to the stitching area in a manner such that the cord or tape may be directly secured to the base material by means of stitches '41. Means, not herein shown, may be provided for maintaining a supply of cord or tape at a convenient position above the stitching area and, furthermore, conventional means may be associated therewith for directing this cord or tape to the presser-foot.

It-will also be appreciated by those skilled in the art that the present invention provides a most simple but yet efficient means for guiding a cord to the stitching area of an overseaming type sewing machine, .In other words, the present primary block 23 with its secondary block 3'! incorporates therein not only the usual chainingoff finger 25 and the knife blade receiving notch 40, but it is also provided with a cord-guiding passageway 42 which functions to directacord to the stitching area in a manner such that the cord will be guided in a predetermined manner.

any number of cord guiding blocks which may contain work-guide passageways of various sizes. Thus, it is not necessary to provide a special presser-foot in order to accommodate various types of cords orta'pes for it is merely necessary to provide a plurality of work-guiding blocks of winch each is provided with awork-guiding passageway of a desired size, and these blocks may be selectively secured" to the presser foot; Thus, the present invention'provides a most inexpen sive means for guiding cords or tapes to a presserfoot, which means, however, are also most efiicient in operation. I

Having thus set forth the nature of the vention, what I claim herein is 1. A sewing machine presserfoot comprising an -elongated sole-plate, a block ren w/ably} mounted upon the upper surface of said soleplate and having one end portion thereof overhanging one longitudinal side portion of said soleplate and being formed with a depending sole surface which is disposed in flush relation with the bottom of said sole-plate, a chainingoff finger carried by and extending rearwardly of the overhanging end of said block so as to be disposed in transversely spaced relation with the said longitudinal side of said sole-plate, and a cordguiding passageway formed in said block, said passageway being inclined with respect to said sole-plate and having its entrance and exit ends located respectively at the upper and lower surfaces of said sole-plate and with the exit end thereof disposed between said chaining-off finger and the said longitudinal side portion of said sole-plate.

2. A sewing machine presser-foot comprisin an elongated sole-plate, a block removably mounted upon the upper surface of said sole-plate and having one end portion thereof overhanging one longitudinal side portion of said sole-plate and being formed with a depending sole surface which is disposed adjacent said longitudinal side portion and in flush relation with the bottom of said sole-plate, the exposed outer face of the overhanging end of said block being formed with a knife-receiving notch, a chaining-off finger carried by and extending rearwardly of the overhanging end of said block and being disposed in transversely spaced relation with the said longitudinal side of said sole-plate so as to form therewith a needle-receiving slot, and a cord-guiding passageway formed in said block with its entrance end disposed at the upper surface of such block and with its exit end disposed at the sole surface of the overhanging end of said block between said 6 chaining-off finger and the said longitudinal side of said sole-plate.

3. A sewing machine presser-foot comprising an elongated sole-plate with an upturned forward end, an auxiliary work-pressing finger extending transversely from one longitudinal side of said sole-plate, a block removably mounted upon the upper surface of said sole-plate rearwardly of said auxiliary work-pressing finger, said block having one end portion thereof overhanging the said longitudinal side of said sole-plate and having the exposed outer face of such overhanging end cooperating with said auxiliary work-pressing finger to form a three-sided knife-receiving notch, a chaining-01f finger formed on the rearward edge of the overhanging end of said block and disposed with its trailing portion in transversely spaced relation with the said longitudinal side of said sole-plate thereby to form a needlereceiving slot therebetween, and a cord-guiding passageway formed in the overhanging end of said block, said passageway being inclined relative to said sole-plate, the entrance and exit ends of said passageway being located respectively at the upper and lower surfaces of said sole-plate and with the exit end thereof disposed between said chaining-off finger and the said longitudinal side of said sole-plate.

JOHN L. ROCKEZRATH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,124,376 Woodward Jan. 12, 1915 2,434,158 Herr Jan. 6, 1948

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