US1302998A - Presser-foot for sewing-machines - Google Patents

Description

|. r; WEBB.

PRESSER FOOT FOR SEWING MAGNINES.

APPLICATION FILED JULY I5.19 15.

1,302,998. ten M y 6 1919.

INVENTOR W Y K ATTORNEY Y UNITED STATES PATENT OFFICE.

IRVING F. WEBB, OF ELIZABETH, NEW JERSEY. ASSIGNOR TO 'THE SINGER MANUFAC- TUBING COMPANY, A CORPORATION OF JERSEY.

Specification of Letters Patent.

Patented May 6, 1919.

Application filed July 15, 1915. Serial No. 89.970.

To all whom it may concern: a

' Be it known that I, IRVING F. WEBB, a citizen of the United States, residin at Elizabeth, in the county of Unionand tate of New Jersey, have invented certain new and useful Improvements in Presser-Feet for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide a sewing machine presser-foot adapted to readily pass over very heavy and .coarse fabrics and particularly adapted to pass over several plies of fabric such as are encountered in stitching themouths of heavy burlap bags. It also has for its object the construction of a presser-foot which will insure at all times the chaining off of the connecting seam between successive articles as they pass beneath the stitch-forming mechanism particularly just prior to and at the beginning of the entrance of the heavy fabric between the resser-foot and the usual worksupporting element.

A further ob t of the invention is to shield the needle from penetrating coarse and bulky material which may be deflected overthe presser-foot, so as to obviate liability to breakage of the needle. A further object of he invention is to prevent accidental injury of the fingers of the operator by the needle.

According to the present invention the resser-foot is constructed with a shank portion carrying at its lower end a tilting primary or'rearward foot-plate. or piece. iv oted upon the forward portion of the primary foot-plate and arranged in advance thereof, is a secondary orforward foot-plate or piece which is spring-pressed to retain it' in" normal relation with the primary footplate so that the treadsof both foot-plates. will be substantially flush at their adjacent ends; Rigid with the secondaryifoot-plate is a lug embracing its pivotal support with the primary foot-plate and overlying the tread portion ofthe latter. As, thefabricv approaches; the secondary ,footeplate the lattea isc-slightly tilted untilfthefabric has almostreached theinner; end oi the secon-dary foot plate and is about-tobe entered by the needle when a further movement of the fabricbrings itiin contact with the primary-.foot plate which will alsmhmtilted so itawoahshgeginp seed that will. be. valued into substantial alinement with that of the secondary foot-plate but its heel will still remain in contact with the throat-plate, which is necessary to provide sufiicient pressure upon the needleand looper threads to insure the proper chaining ofi' between successive articles being stitched. The pri: mary foot-plate remains in tilted position until one or more stitches have been oompleted when, by the continued travel of the material, the presser-foot will ride upon the advance and of the material in the usual manner to allow unobstructed passage of the latter. The secondary foot-plate is yieldingly forced downward by a spring into flush relation with the primary foot-plate.

In the preferred form of theimprovement the secondary footeplate is provided with a guard which extends above the needle in extreme retracted position of the needle- 'point from the throat-plate and shields it from penetration of the materialwhen accidentally deflected over instead of under the Presser-foot, which sometimes happens under certain conditions when stitching heavy burlap or canvasbags. This'guard is preferably carried by the secondary foot-plate and moves with the latter when tilted.

As represented in the drawings, Figure 1 is a perspective view of a portion ofa sewing machine head showing the resser-foot, with the material passing under the secondary foot-plate which is slightly tilted. and the-needle entering the material; Fig. 2 is an elevation showing the presser-foot,

artly in section, withthe fabric passing en'eath the secondary foot-plate and coming in contact with the primary foot-plate but with the heel of the latter still resting upon the throat-plate. ig. 3, is a detailpefrspecr tiveview. of thesecondary foot-plate with the guard and FigeA and 5 are similar detail views of the presser-foot shank and the primary foot-plate, respectively.

As represented-in the drawings, the im: provement embodied in the well. known Singer machine/for stitching bags comprising the work-plate 1, sustaining the throatplate 2 having the usual openings to receive the feed dog 8. Above the workrplate lie the usual bracket-arm 4 having the head 5 in which is suitably journaled the pressesloar 6 and needle-bar .=7 carrying the needle 8.

Depending from the presser -bar (l and cares xterma h Ma 9 ans . f Said. plates 1 cbmp s n i S i-1km out-plate mounted therjon, 7

plate 1' mounted u poig; said {and m'pans parp'i b -p1'ate mounted. thereon,

1 t m'qunted- 'uFon said and means inc tarp d between said foot-plates the primary foot-plate relatively o t-Plat e;

a presser-fwtiy I mou pon a d sha 'w a y otplate mounted upoinsa id prinm'py .and' a. gualfdbfifl plates'gandwgx'mnd' porting eleme'lihbe uding a wbifk I PP' throughout it len tionf retraction rk-suP-Pdttin ii-foot plate having a, {rearward plate In testiinony 9 t s P

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