US1917840A - Sewing machine - Google Patents

Description

' July l1, 1933. G. A. HERDTER 1,917,840

SEWING MACHINE Filed Dec. 2l, 1931 ZZ* 2! Z 35 IN1/ENT R.

si `u f 20 Am EVS. gj m 22 Patented July 11, 1933 UNIIEO STATES GEORGE A. EEBDTER, or sr. ALBANS, NEW YORK, 'Assrenon 'ro o. r.. DANIELS'INO., OF i i 'tensa PAT ENT: OFFICE,

' NEW YORK, NQ. Y., A CORPORATION OFNEW Yon-Ef' SEWING MACHINE Application led December 21,1931'. Serial No. 582,371.

This invention relates to sewing :machines and particularly to machines using alternating presser feet which are used for stitching several layers ofcloth. Thesev alternating 5 pressers consist of two separate presser feet,

one of which assists the drop feed in carrying the work forward foreach stitch, while the other'foot alternately rises and descends to hold the work. The present invention re- 10 sides in a form of presser foot which enables cordage or cylindrical bodiesto be stitched to a flat fabric while insuring an -even feed between the fabric 'and the cordage. This presser footv cooperates with the feed dogs '15 of the machine so that inthe forward nieve-v ment of the feed, the fabric and theA cordage are moved to the same extent. For this purpose, the presser foot engages the cordage on the top by a non-slipping engagementk dur- 20 ing the feeding movement so that as the cordage is stitched to the fabric a smooth, even surface is obtained without wrinkles.

This invention will be more particularly understood from the following specification 25 and the accompanying drawing, in which,

Fig. 1 is a front elevation of the vertical moving parts of the sewing machine head to which this invention is attached;

Fig. 2 is a plan View of the presser feet T3-0 sectioned on line .Q -2, Fig.`1;

Fig. 3 is an elevation, partly sectioned,

showing the presser feet in place during the stitching operation;

Fig. 4 is an elevation, partly sectioned,

353-5 with the needle withdrawn and the feed dogs at the start of the feed movement;

Fig. 5 is a sectional detail on line 5,-5 of Fig. 4;

Fig. 6 Vis an elevation, partly sectioned,

@to showing the feed dogs at the end of the feed movement;

Fig. 7 is an elevation, partly sectioned, of the feed dogs in the lowered position, and

Fig. 8 is a fragmentaryview of a portion 7 4-5 of canvas to which a rope has been directly stitched hy the mechanism illustrated.

The presser foot which assists the drop feed comprises two-parallel bars which are f placed directly over the feed dogs and are 50 spaced apart by a pair of arch-shaped end pieces through which the cordage passes and isguided. These archrshaped'end pieces are provided with adjustable points which pro- ]ect intogthe cordage whenthevfeed movementis bein ,made` thereby insuring thatthe 55 comparative y stiifcordageshallfeed at the same rate as the' canvas to which it is to be stitched. hen the feed movement is completed thecordage is' released from these points and the presser foot returns by a'GG spring action to the starting position for another operation. yThe presserfoot is provided with anV aperture atjthe l feed endV thro-ugh .which the cordage passes and is maintained vin alignment with the presser foot. I 1 y f Tn the drawing, 11 is the sewingmachine head andi 12 is the table. 13 is the feed presser vfoot which is operated by the stem'14`, 15 is the holding presser foot operated by the stem 16 and 17 is the needle stem carrying the needle 18. The needle feeds Vdirectly through a slot in the' presser footl 15 and through the cordage 19 and the fabric 20,

forwardin the slot 22 in the table of the machine, these dogs aligning with the parallel members 31 and 32 of the presser foot 13.

The sewing machine mechanism referred 1 to for operating the stems 14, 16, 17 and the feed dogs 21`corresponds with the commercial mechanism of class 7 machines manufactured by Singer Manufacturing Company and further description of the mechanism `used to operate these partsisnot necessary in the present case. l

^ The presser foot for the purpose of this invention comprises the parallell bars 31 and 32, Fig. 2, which arev joined at the ends by the" V arch- shaped portions 33 and 34 and on the top of each archa pointed screw 35 is provided., This device is secured by the lug 36 1 to the operating stem 14 of the machine. At the feedingendof the presser foot a bar 37 9 is provided as indicated in Figs. 4 and 5 forming an aperture through which the cordage 19 is fed with the objectof maintaining the cordage in alignment with the needle and the from passing under the ends of the bars 31`Y and 32 and thus interfering with the operation of the machine.

- As shown in the drawing the bars 31 and 32 press the fabric against the feed dogs 2l and against thetable 12. Thepresser foot rests upon the cordage and moves. up and down therewith.

In the feeding operation as indicated iny Fig. f1 the feed dogs 21 areraised and theV cordage 19 is forced into engagement with the pointed screws 35, the feed dogs then move over to the extent of slot 22 as indicated in Fig. 6, carrying With them the fabric and the presser foot 13 with the screws 35 and the cordage19. The feed dogs then move fabric. The pointed screws Vacting` upon 1 lthe top of the cordage contribute materially to this result and are an important featureV of myinvention.

claim Having thus described` invention, I i

`1. A presser foot for use-in stitching cordage to fabric comprising a pair of parallel members resting on the fabric and connected by spaced,archedmembers through which the cordage passes and points on said arched members arranged to engage said cordage during the feed movement of the fabric and cordage.

2. presser foot for use in stitching cordage to fabric comprising a pair of parallel members resting on the fabric, a pair of feed dogs aligning with said members, transverse members connecting said vparallel members and below which the cordage passes, means for engaging said cordage with said transverse membersduring the feed movement of saiddogs and means for disengaging said transverse members and cordage.

31A presser foot for use in stitching cordage to fabric comprising apairA of parallel members resting on the fabric, a pair of feed dogs aligning With said members, means connecting said members and an aperture formed by said connecting means at the-entering end of said presser foot through which the cordf 'a ge passes'and means for engaging the cordage said 'connecting means during the feed movement of said dogs.

Signed at New York, in the county of New York and State of New4 York, this 30th day of November,-A. D..1931. l i GEORGE A. Hnnnrnn.

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