US1713324A - Chaining presser foot for felling machines - Google Patents

Description

May 14, 1929. J M, B|DDLE 1,713,324

CHAINING PRESSER FOOT FQR FELLING MACHINES Filed (3'0. 23 1926 Patented'May 14, 1929.

UNITED STATES PA NT JOHN M. BIDDLE, or oHIoAGo, ILLINOIS, ASSIGNOR T UNION s ncIn-L mAdHms COMPANY, or CHICAGO, ILLINOIS, A ooRPonA r on onILLINoIs.

, OHAINING PRESSER FOOT non FELL NG MAcIIInEs.

Application filed October 23, 1926; Serial No; 143,648. V i

' The invention relates to newand useful iIn provements in a chaining presserfoot-for felling machines, and'more particularlyto a chaining presser foot of the type shown in the application filed by Joseph Berger, July 9, 1926, Serial No. 121,425. In this prior application, the foot portion ofthe presser foot is provided with-a channel extending lengthwise thereof for guiding the fabric sections for felling-and located in this channel are'chaining fingers which-are pivoted to the foot adjae cent the rear end thereof, and which chaining needles indicated in broken lines fingers terminaterat the needle holes-in; the foot. These chaining fingers are yieldingly pressed downwardly at their free ends by the aid of'springs. r I j An object of the present invention is to pro- 'vide a chaining foot of the above type, wherein the'enchained thread loops are engaged by a yieldable chaining finger rigidly securedto the foot portion and disposed in the channel which guides the fabric sections during fell- Afurther object of'the inventionisto pro vide a: chainingpresser foot ofthe above type,

Whereinthe yieldable finger is so shaped that the free end thereof. is limited in its movement ina downward direction by the engagewith the upper face of thepresser foot. These and other objects will in part be obvious, and will in part be'hereinafter more fully disclosed. I-n the drawings which-show by Way of illustration one embodiment of the invention- Figure 1 is a side view of apresser foot embodying the improvements,

' Fig.2 is a planview of the-presser foot Fig. 3 is a longitudinal sectional view through the presser foot; 1

Fig. 4 is a sectional view on the line 4-4 of Fig.2; f'

Fig. 5 is a perspective view of the spring member which forms the yielding chaining fingers, and i Fig. 6 is a'plan view of a portion of the throat plate with which the presser foot is .used. r

The presser foot is particularly designed for felling, and is of a character similar to with the that shown inthe application filed by Joseph 1 v as indicated in the drawingsfconsists of a which is associated a clampingscrew' 4. The

foot portion5 is pivoted to the shank 1 by a pivot bar 6 so that thefoot portion is capable Berger, above referred 'to.-' The presser foot 1 l of rocking on its pivot bar. 'This greatly aids f in the passing of the fabric beneath the presser foot and In the crossing of seams. This channel 7 extending'the full length-0f the of the foot portion; 7 This channel is of substant ally the width of'the fold in the fabric sectionsto form the felled'seam. InFig'.-4,

I have shown a sectional View through' the interfoldedyto form the felledseam F, and

it will be noted th at'these interfolded fpor-q tions of the fabric sections lie in the channel- 7 and this channel becomesa guide for the felled seam. The presser foot is particularly adapted for use in connection with a' twopresser foot p'ortion5 is'provided with a presser foot, and the fabric sections S and S" needle machine having two needles 9 and10 These two needles passthroughneedle open- ' ings 11 and 12 inthe presser foot, and'needle holes 13 and 14 in the'throat p1ate, indi'cated at 15 in Fig. 6 of the drawings." Theneedles. will penetrate theinterfolded sections of the fabric at'each side of the felled seam; and thus the fabric sections are lines of stitching. 1

joined by twoiparallel The inventionis directed particularly to it the'chaining fingers which are used inconnection withthis type of presser foot. The

foot portion 5 is also provided with a recess 16 in the inclined rear face thereof, an'din this recess, is'located a-plate" 17of spring. I, metal. This plate is of substantially the-same width as 'the recess16, and ascrew-18 passing through anlopening 19 in the plate, firmly secures 'theplate'to the. presser foot. This 7 plate 17 is split at 20 so as to formtwo chain-i ing fingers 21 and 22. Two chaining fingers are shown in the present embodiment of the invention, as two needlesare used. Ifi't was a singleneedle machine, then there would be only the one chaining finger, and if more needles arensed, then there would be the same I 1' 7 number of chaining fingers as there are needles. 2

These chaining fingers are located in the channel 7 in the under face of the presser foot. The presser foot is provided with an opening 23 in rear of the needle hole 12. This opening extends up through the presser foot,

, and the chaining finger is bent so as to extend up througli the opening 23, and it is then i has feed, slots 26, 26,26, and also feed slots 27, 27; The chaining finger'22 is likewise bentupwardly and extends up through an opening 28 through the presser foot and overlies the top of the presser foot directly in rear of the needle hole 11. Said chaining finger 22 is also cutaway at 29 to conform to the needle hole. The throat plate is provided with a solid section 30 directly in rear of the needle hole;v 13. V i

The channel fingers being made of spring metal are shaped so that they normally spring downwardly at their free ends, and the downward movei'n'ei'it of each chaining finger is limited by an overhanging portion which engages the upper face of the foot-.- In other words, if the presser foot is raised slightly at one side of the felled seam for any reason, the chaining finger at the other side will move down so as to' engagethe material. These chaining fingers yield also to the interfolded section's of the fabric, so that the side walls ofthe channel 7 become guiding walls for directing the seam. The chaining fingers at the rear end of the bottom surface of the foot aresubstantially flush with thefoot, and the front "end of thefingrs move to a point above the lower face ofthe foot to form the guiding channel,- 011' to a position slightly beneath the lower surface ofthe fojot. 9 l

The real function of these chaining fingers is to engage the enchained loops passing over the solid sections directly in rear of the needle holes in the throat plate. The presslurc of the spring chaining fingers against the enchained thread loops passing overthis solid portion of the throat plate, holds the enchained loops so that perfect. stitches are formed, even though there is no fabric in the machine to anchor and hold the enchained leops. In other words, these fingers clamp the enchained loops and hold thesame to" the same extent that the threads are held when anchoredin the material. As a result, between stitched articles, a perfect rope of enchained. thread loops is formed, and there is no liability of skipping of stitches between articles, One article is passed through and out of the. machine, and then a series of enchained loops are formed, and then the next article passes underneath the presser foot and is stitched. The operator does not necessarily have to stop the machine to cut the threads, and does, not have to pull on the stitched article as it leaves the machine in order to insure chaining, and therefore, the operator is free to direct the next article underneath the foot. The presser foot, of course, rocks on its pivotal support as it passes on to and off from the stitched articles in the usual manner.

It is obvious that minor changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in theappended claims. Having thus described the invention, What I claim as new and desire to secure by Letters-Patent, is J j. 1

1. A presser foot for sewing machines comprising a foot portion having a needle hole and a channel extending lengthwise thereof for. guiding the fabric sections for felling, a yielding chaining finger located in said channel, said finger being fixed to'the foot portion at the rear end thereof and free at its front end, saidgfinger terminating in rear of and at the needle hole in the foot, and having means for limiting the downward movement of said finger, the front end of said finger being adapted to engage and clamp the enchained thread loops at a point directlyin rear of the needle hole.

2. A presser. foot .for sewing machines comprising a foot portion having a channel extending lengthwise thereof for guiding the fabric sections for felling, a yielding chaining finger located insa-id channel, means for rigidly securing said finger to the presser toot at the rear end thereof, said presser foot having a needle hole and an opening therethrought in rear of the needle hole, said yield- .ing chaining finger being bent upwardly and extending. up through the opening in "rear 7 of the needle hole and overlying said presser foot, whereby the downward movement of the free end of the chaining finger is limited,

said chaining finger at the forward end thei'eof being adapted to engage a solid portion of the. throat plate for holding the enchained loops during chainingofi'.

3. A presser foot for sewing machines comprising a foot portion having a channel extending lengtl'iwise thereof for guiding the fabric sections for felling, said foot portion havingan upturned rear end with a recess in its under face, and having a plurality of needle openings through which the needles pass, said foot portion having openings therethrongh in rear of the needle openings, a plate of spring metal located in the recess at the rear of the foot andsecured therein by. a

clamping screw, said plate being formed into bent'upwardly'at their free ends to pass, up the enchained thread loops and press the throught the openings in rear of the needle same against the solid portions of the throat holes, the extreme forward ends of said finplate in rear of the needle holes in the throat 10 gers being bent so as to overlie the presser plate during chaining off. 7

5 foot and limit the downward movementof In testimony whereoLIaflix my signature.

said fingers, said chaining fingers at their free forward ends being adapted to engage JOHN M. BIDDLE.

Images