US1793372A

US1793372A - Presser foot for sewing machines

Info

Publication number: US1793372A
Application number: US306380A
Authority: US
Inventors: James R Moffatt
Original assignee: Union Special Machine Co
Current assignee: Union Special Machine Co
Priority date: 1928-09-17
Filing date: 1928-09-17
Publication date: 1931-02-17
Anticipated expiration: 1948-02-17

Description

Feb. 17, 1931.

J. R. MOFFATT FRESSER FOOT FOR SEWING MACHINES Filed Sept. 17, 1928 2 Sheets-Sheet l Feb. 17, 1931. J. R. MOFFATT PRESSER FOOT FOR SEWING MACHINES Filed Sept. 17 1928 '2 Sheets+Sheet 2 Gwen Q1 5 I illustration one Patented Feb- 17, 1931 f1 793,-37zf JAMES,.R'MOFFATT, or CHICAGO, ILLINOIS, ,AssIGNoR:reunion:srEcIAn i/momnn'.

COMPANY, or .GHICAGO, rnninois; AeoRroRATIo-n on-I LLI o-isj raEssER' FOOT its SEWING MACHINES;

Application filed september 111928;; semi No. s'os sso.

The invention relates to new and useful improvements 111 a presser foot for sewingmachines; and more particularly to a 'presserfor a sewlng'mach ne adapted to make a flat B earnh An object of the invention is'to; provide a presser "foot for sewing machines" having a guiding channel for guiding the upturned edge portions of fabric sections for trimming 11? and meansfor turning said trimmed edge portions into flat lapped relation .to each other with a yielding section atone side of they channel which is'pivotally attached to the shank of the presser foot so t'hat the fabm ric'engagingportion of said section is capable of a substantially uniform yellding movement in verticalf'dirfection. I

A furthe-r object of the invention is to provide apresser. foot. of-the above type wherein movement.

A further object of the invention is to provide; a presser foot of theabove type having a yielding section n rear of; the needle which zsf xtend's all-the way acrossthe presser foot.

These and-other objects will in part beobvious and will in part-be hereinafter' more fully disclosed. q In the drawings which show by way of tion: r Fig. 1 is a plan View of a pressei: toot emhod-ying the; invention.

Fig. 2 is a bottom plan view guide bar.

Fig. 4' is a' diagrammatic view on the line:

H of 1, and showing the position of the parts when the fabric sectionsare ofuniform thickness. I

Fig. 5 is a view similar to Fig. {l but show- 7 ing the position of the parts with the fabric lg flsections of greaterthickness at the left of the channel in the presser foot. 7

Fig. 6 is a View similar to Fig. 4, but showing the position of the parts with the fabric sections at the right of the channel of greaterv 5'0" thickness.

are capable of vertical embodiment of. the invenr of the same' Fig; 3 isalsid'e'view of apre'sser foot showing the attachment to the presser bar andthe Fig.7 is sectional view on 'the line 77" of Fig. 1

FigJSis' a side view of a presser foot ,of'a

slightlymodified forinof construction.

Fig. -9 is a plan'view of the presser foot shown'in 'Fi'g. 8. '1' T Y x 1 Theinventionis directed to a presser'foot for sewing machines I wherein the fabric" sections are trimmed, then overlapped and secured by a'covering stitch forming inechanism, thus forming a substantially flat .seam. The presser foot is-p'r'ovid'edwith a channel which receives" the upturned edge,

portions anddirects the same ito trimming'devices. In" rear of thetrimmin'g devices thereis means for turning the edge portions into fiat lapped relation prior to the stitching o-f thesame The section of: the; foot? at one side jot-the channelfis pivotedytothe shank of the presser toot ata pointbetweentheat tachme'nt 'ot the resser foot tothe presser bar andthe'guidehar'." This-'seetionis'yieldthe presser foot'inclu'desa 'shank portionl I V I which is -adapted to be attachedto'a presser.

bar 3 and a guide h'ar 2 which are of theusual construction; The shank portion 1 carries a rigid foot portion 4. Attached to theshankof the presser foot is a yielding sec- .tion 5 and this yielding section 5 is spaced from the rigid foot portion 4 so as to pro--- videa'channel 6. The-upturned edge portions of fabric sections-are directed into this channel. In Figs. 4 to Got the drawings the fabric sections are indicated at F,

F; and the upturned edge portions at f,

Attached to the rigid foot portion ofthe presser foot is a stationary trimming blade 7. Cooperating withthis stationary trimming blade 7 "is amovabletrimming blade- 8. The upturned edge portions are directed to Y these trimming devices and are trimmed after thread laying mechanism cooperates with v the needles above-the-p'resser foot',- and thus it is that a covering stitch is formed. I

The yielding section 5 is rigidly connected to an arm 10 which extends along the side of the shank portion of the presserfootand is secured to said shank at a point adjacent the rear side of the shank. As shown in the drawings, it is pivoted at 11 by means'of a suitable screw. By the placing of this pivot for this yieldingsection well to the irear of the presser foot the yielding section will I move substantially bodily in a vertical direction. The rear end 12 of the yield ing section 5 is curved about this pivot 11 as a center. In the form of the invention 4 is provided with a section13 which extends all r the way acrossthe Tpresser foot and lies directly in reanof the yielding section! The forward end of this section 13 is curved at 141 and-this curve is. also formedabout the pivot'll as acenter.

. The upper face of this rigid portion113 is provided with a recess 15' "extending trans; versely across] said rigid foot portion.

Mounted in this a recess is a bar 16 on which the stitfchfingers 17 17"are mounted; The

arm 10 overliejsthis; rigid portion l3.- A

spring 18 is housed in a recess in the under thisbarlG. The stitch fingers may readily I the presser foot isprovided with-a cut away portion in which is located a section 19. This sectionextends all the way across the presserfoot. It is carried bythe vertically V disposed

members

20, 20 whichslidein' recesses' formedin'the side fa'ces' of the shank 1 of the presser foot. The arm'lO-is located in rear of this vertical member 20. Springs 21, 21 are provided which-bear on thissection 19 and yieldingly press the same down the yielding section '19 will move down movement of the yielding member 19. The' forward end 24 of this'yielding section 19 1s also rounded ofi. This yielding section at the rear of the presser foot'forms no part of the presentinvention per se, but is described and claimed in the application filed by Albert S. Riviere and Charles F. Rubel,

* Sept -12, 1928,-Seri al No. $05,435

when there are two layers in the fabric section at the left of the channel and one layer at the right,then the entire presser'foot will yield so asto bear on the two layers and the yielding section 5. will be .moved downward so that the lower face thereof is beneath the plane of the bottom of the section at the left of the slot. This causes the yielding section 5 to engag'ethe fabric of a singlethicknss' and possibly hold the fabrio'section in cooperative relation tothe feed which engages the same and also holds'the section with the upturned edge portions properly positioned and directed to the trimming devices. This yielding section terminates in front of the needles. The rigid member 13 is at the side of the needle opening through V which the needles-operate and engages the fabric sections alongside of the needles. This rigid member 13 also limits the extent to which the yielding section will be depressed when the foot is raisedfrom the, material. A spring 25 bears on the arm 10. and tends H to force the yielding section downward. shown-inF-igs. 1 to 3 the rigld foot portion lnfFigpfiof the drawings the fabric sectionsfare shown as consisting of two plies at the left of the channel and one ply at the' right of'the channel. In Fig. 6 of the draw.-; ings'the fabric sections are shown as consisting of a single ply at the leftof the chan nel and two plies at the right of the channel and under these conditions the yielding section 5 moves so that: the lower face thereof" is above the plane of. the face of the rigid section of the foot at the left of the channel. The presser foot at the left of the channel clamps the single ply firmly against the work support and there arefeed dogs for conface of the yielding section and bears agamst trolling the feed ofthe same while the yield- 1 ing section at the right of the channel likewise firmly holds the two plies pressed against the work support and against the sections of the feed dog beneath the. same. The. entire portionof the yielding section 5 which engages the fabric sections is well in front of the pivot point 11 and this foot portion in effect moves bodily and to a uniform extent in a substantially vertical direction.

When a cross seam passes beneath the presser foot the portion thereof in front of the needles will be raised in proportion to the thickness of the cross seam. At this time through the action ofthe spring thereon and into engagement with the fabric section in advance of the cross seam and will hold said 1 fabric against the cloth plate or the sections I the fabric is firmly clamped against the cloth plate or against the sections of the feed dog.

The front edge of the yielding section is curved and likewise the front edge of the rigid section 13 and the front edge of the yielding section 19. This permits the fabric to move freely under these sections.

In Figs. 8 and 9 of the drawings a slightly this form of presserfoot the yielding section ,5 is pivoted at 26 to the arm 10 which supports the same and the arm 10 is, in turn, pivoted at 11 to the shank of the presser foot.

There is no rigid section 13 extending in rear of the yielding section 5. The yielding sec tion 5 is located directly in front of the yielding section 19, and therefore, the yielding section 5 has been extended to a line in rear of the needles. This pivoting of the yielding section aids in the passing of the yielding section'onto a cross seam. The stitch fingers are rigidly carried by the pivoted yielding section in this form ofthe' presser foot. In this form of the presser foot there is the yielding section 5 at one side of the channel which has a substantially bodily ver tically yielding movement and also a section that extends all the, way across the presser foot in rear of the needles which likewise has a bodily vertically yieldingmovement;

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 I in the appended claims. r

. Having fully described my'invention, What I claim as new and desire said limiting. means being disposed so that the bottom face of the yielding section moves across the plane containing the bottom face of the remainder of the presser foot.

2. The combination of horizontally disposed trimming devices, a presser foot having a channel for directing the upturned edge portions of fabric sections to said trimming devices and having means for overlapping the trimmed edge portions for stitching, means for pivotally supporting the section of the presser foot at one side of said chan nel on the shank of the presser foot and yielding means for moving said pivotal section downward, means for llmiting the clownpresser foot; modified form of presser foot 1s shown: In

to secure by Let-" wardani'ovemehtofsa-id yielding; section, said. I

limiting meanszbeing: disposed sogthat'th'e bot-- tom face of the yielding section: moves across the plane containing the bottom: face: of the remainder of the presser foot, an'dmeansi for yieldinglysupporting stitch fingers on said 3; The combination of horizontally.

posed trimming devices, a presser foot haV-I; ing a channel for d recting theupturned edge PQItIODS Of fabric sections to sa d trimming-- devices and "having means for overlapping.

the trimmed edge portions forstitching, means for pivotallysupporting thesecti onof the presser foot at' one-side of said channel on the shank of the presser foot-and yielding means for moving said pivotal section downward, means for limitingthe downward movement of said yielding section, saidalimit ing'means beingfdispose'dso that the bottom facejof theyieldin'g section moves across the plane containing the,bottom face ofthe re- 'mainder of the presser foot, said presser foot having a yielding section in rear ofthe needles extending all the Way across the presser foot, means for yieldingly depressing said section,.and stops for limiting the moveing section moves across the plane of the bottom of the remaining portion of the-presser foot.

posed trimming devices, a presser foot having a channel for directlng the upturned edge portlons of fabrlc sections to said trimmlng devices and having means for overlapment ofsaid section, said stops being disposed so that tlie lower face of said yield- 4; The combination of horizontally disping thetrimmed edge portions, means for pivotally supporting the section of the presser foot at one side of said channel'on the shank of the presser foot, a spring for moving said pivotal section downward, stops for limiting the movementjof said yielding V c section, said stopsbeing disposed so that the bottom of said yielding section moves'across a plane containing the bottom of the section attthe opposite side of the channel, the foot portion of said yielding section being disposed wholly in advance of the stitching mechanism, said i'presser foot having a rigid section directly in rear of said yielding section and at one side of the stitching mechanism, and means for yieldingly supporting stitch fingers on said rigid section. a j

5. The combinationbf horizontally disposed trimming devices, a presser foot having a channel for directing the upturned edge portions of fabric sections to said trimming devices and having means for overlapp ng the trimmed edge portions, means for pivotally supportingthe section of the presser foot at one side of said channel on the shank of the presser foot, a sprlng for moving said pivotal section vdownward, stops for limiting the movement of said'yielding section, said stops being disposed so that'the bottom of said yieldingrsection movesacross a plane containing the bottomrof the section at the OPOSlte side of the channel, the foot portion 0 v said yielding section being disposed Wholly 1n advance of theistitc'hing mechanism, said presser foot having a rlgld sectlon' directly in rear of said yielding section and at one side of the stitching mechanism, means for yieldingly supporting stitch fingers on said rigid section,- said presser foot having a yielding section extendingall the way across the foot directly in rear of 7' the stitching mechanism, springs-for yieldingly depress- :ing said last-named section, and means for limitingthe movement of said section, said limiting means beingidisposed so that the bottom of said section moves across the plane containing the bottom of the rigid section.

In testimony whereof, Ijaffix my signature.

JAMES R. MOFFATT.