US1311880A - Planooraph co - Google Patents

Description

A. H. DE VDE.

FEEDING MECHANISMFOR SEWING MACHINES.

APPLICATION FILED uma. IQII.

l ,3 1 1 ,880. Patellted Aug. 5, 1919.

2 SHEETS-SHEET l.

THE COLUMBIA ILANocIR/ukl LO., WASMINIITON. n. c.

A. H. DE VOE.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLlcATloN FILED 0512.8. lsu.

1,311,880. Patented Aug. 5, 1919.

2 SHEETS-SHEET 2.

MKM

BY fQ/iw, A TTOH/VEY TNB COLUMHIA PLANOGRAPII C0.l WASHINGTON, D C

UNITEDA sTATEs PATENT oEEIoE.

ALBERT H. DE voE, E WEsTFIELD, NEW JERSEY, AssIGNoETo THE SINGER. MANU- j FACTURING- COMPANY, A CORPORATION' OF NEWJERSEY.

IEIEEEIDIII'G-v MECHANISM FOR SEWING-MACHINES.

. which a four-motion upper feed-dog rises and falls reciprocally with a presser-foot.

The ,invention has for its object to provideasimple and durable feeding mechacomprises a-feed-dog sustained by a carrierl rLars nismycompaetly arranged to provide an unobstructed space under the overhanging arm and to provide readily accessible means for yadjusting the extent ofthe feed-dog Inovements.

`In its preferred embodiment the invention fulcrumed upon a supporting rock-lever pivotallycarried bythe presser-bar. Two rockshafts are journaled tooscillate upon a common axis in bearings provided on the head ofthe machine and are actuated from the driving shaft of the machine by connections therewith adjustable independently of each other. .One of the rock-shafts actuates the supporting rock-lever to impart feeding movements to the feed-doo and the other s :y rock-shaft oscillates the feed-dog carrier upon its fulcrum to impart rising and falling movements to the feed-dog and to lift the presser-bar whenthe downward movement of the feed-dog is arrested .by the throatj plate or the fabric upon it.

In the accompanying drawings Figure l is a rear side elevation, partly in section, of a machine having ,its `cloth-plate removed and embodying the present improvements. Fig. 2 is 'a front end elevation of the machine with the face-plate of the bracket-arm removed. Fig. 3 is a sectional view on the line A-A, Fig. 1, and Fig. 4 is a detail perspective view of the feed-dog Jand presserfoot. l The machine is constructed with the usual -base 1, hollow-standard 2 and overhanging bracket-arm terminating in the head 3. Journaled inthe base 1 is the main or driv- Specication of Letters Patent.

Application mea December s, 1917. serial No. 206,209.

andbalance-wheel 6.` The shaft 4. is formed with la crank 7 embraced by the lower end of a pitman 8 whose upper end is pivotally connected with the lateral arm 9 of the needle-actuating rock-shaft 1.0, journaled in' bearings provided in the overhanging bracket-arm ofthe machine. The forward end of the rock-shaft 10 is connected by means of a crank-arm 11 with a link 12 pivotally secured to a collar 13 on the vertically reciprocable needle-bar 14 carrying the needle 15. Coperating with the needle 15 below the throat-plate 16 in the formation of stitches is a looper 17, adjacent which is shown a trimmer 18, the construction and operation of which is unessential to an understanding of the present invention. A

Mounted for vertical movement in the head 3 is the presser-bar 19 sustaining the presser-foot 20 secured thereto by means of.

the screw 21, the spring 22 acting to yieldingly press the presser-foot upon the clothplate 16. The lifter-bracket 23 is slidingly supported upon the presser-bar 19 by means of sockets formed in the spaced ears 23a and 23", and is provided with the roller-stud 24 normally restinoupon the hand lifter-lever y25. The lifterracket is also provided with a stud-pin 26 entering an aperture in one end of a lever 27 fulcrumed upon a studscrew 28 on the bracket-arm. The other end of the lever 27 is connected with the treadlerod 29.

Two spaced collars 30 and 31 are secured upon the presser-bar 19, the collar 30 being positioned immediately above the ear 23b of the lifter-bracket to afford means for lifting the presser-bar upon operation of either of the lifter-levers. Bridging the space between the collars 30 and 3l is a plate 32 to which is `secured a fulcrum-pin 33 for the supporting rock-lever 34. Fulcrumed upon the lower end of the lever 34 by means of a stud-pin 35 is an elbow-lever or feed-dog carrier 36 to the lateral arm of which is secured the feed-dog 37 bifurcated to admit the fabric engaging portion of the presserfoot 20. Journaled upon bearing-bosses 38 and 39 formed upon the rear side of the overhanging arm of the machine is a hollow or tubular rock-shaft 40 to the rearward end of which is secured a collar` 41 having a laterally extending slotted arm 42, to which is l ing shaft 4 provided with the belt-wheel 5; pivotally secured in adjustable positions the upper yendV of a .pitman 43 formed, latiitsV` lower end, with a strap embracing an eccentric upon the driving shaft 4. Journaled within the tubular shaft40is a second rocktric 47 upon Vthe driving shaft 4. The connections described afford means for actuating the rock-shafts to` any predetermined dog 37.

extent of movement within 'the rangeof the adjustmentsprovided.v 1

To the forward endof the-rock-shaft 40 is secured a collar having adepending-arm 48 pivotally connected by means of a pivot screw .49 with one vendof a link 50 of which the other end isrconnected in like manner by means of a pivot screw 51-with the upper end of the supporting rock-lever 34. The' Vactuation vof the rock-shaft through theV described connectionsv i transmits vibratory movements to the rock-lever 34 and throughVV its connection with the feed dog carrier=36 impartsV feeding. movements ,to the feed-v are derived from the-rock-shaft 44 to the forwrardend of lwhich is secured a collar`V 52 having a depending arm 53, which transmitsthe movements 'of theV rock-shaft to i the upwardly extending armv of the feeddog carrier 36 Ythrough the intermediary of the link 54 and the pivot-screws 55 and 56. The rocking movements Vthus imparted to the feed-dog'carrier 36 upon its fulcrum 35 cause the rising and falling movements of the feed-dog. Thev rock-shaft 44 has a greater range of movement than is necessary to return the feed-'dog from its lifted posi-- tion into contact with the material upon thek throat-plate, the continued movement ofthe'` rock-shaft 44 after the feed-dog 37 contacts Vwith the material being expended in lifting the presser-foot with the feed-dog acting as the fulcrum. The lifting4 ofthe feed-dog above the material after the completion of its feeding movement permits the' presserspring 22 to return the presser-foot upon the material. The fabric engaging portion of the feed-dog 37 is preferably vslightly curved and has a rolling action during its feeding movement, throughout which the uniformity of the fabric gripping action of the feed-dog is consequently maintained.

I-Iaving thus-set forth the nature of the invention, what I claim herein is f 1. A four-motion upper feeding mechanisin for sewing machines comprising a feedfdog, a supporting rock-lever, a feed-dog carrier fulcrumed upon and sustained solely by said rock-lever, actuating Vmeans acting through said rock-lever to impart feeding movements to said feed-dog, and vmeans for rocking said carrier upon its fulcrum'Y The feed-dog lifting movements with a reciprocally rising and falling presser-l foot and feed-dog, aV presser-bar sustainlever sustained by the presser-bar, and a cal movements to said presser-foot vand feeddog.V Y Y 3.

In ar sewing machine, in'combination,v

- ing said. presser-foot, a supporting rock- Y feed-dogcarrier fulcrumed upon said 'rock-fy leveiQ'ofmeans for actuating-said rock-lever y to impart feeding movements to said feed-V dog, and means for rocking said feed-dogV carrier upon its fulcrum to impart recipro-lv a 'reciprocally rising and-falling presser-f 1 foot and feed-dog, a presser-bar sustaining said *presser-foot, a` supporting rock-lever. sustained bythe presser-bar,V a feed-dog car-L'V rier fulcrumed `upon said rock-lever, two rock-shafts, means for actuatingsaid rockshafts,an operative connection between one` of the rock-shafts and saidfro'ck-lever for impartingfeeding movements to said feeddog, and an operative connection: with the other rock-shaftr for rocking saidfeed-dog carrier upon its fulcrum to impart reciprocal movements tosaid feed-,dog audpresser-"- 4.. In a sewing 'machine,` in combination, afeed-dog, a supporting rock-lever, a` feeddogY carrier fulcrumed thereon, two Yrockshafts mounted for oscillation upon acommon axis, an actuatingVv shaft, drivingconncctions adjustable'independently of each other between said actuating shaftland each;H t

lof said rock-shafts, means foractuating said rock-lever' to impart feeding .movements to said feed-dogrfromone ofthe-rock-shafts,

and an operative fconnection between'y the other rock-shaft and fthevfeed-dog carrier'for` rocking: said carrier upon 'rits fulcrum to impart rising andV falling 'movlements vto said feed-dog. f v c l y 5, In a sewing machine, in combination, a;

presser-bar, a presser-foot sustained by saidV presser-bar, a supportingv rock-leverful-` crumed upon saidpresser-bar, a feed-dog carmerfulcrumed upon' said rock-leverV and sustaining a feed-dogV having .1a 'curved said rock-lever to'impart feeding movements to said feed-dog, and means forV rocking saidV carrier upon 4its.V fulcrum toimpart rising and falling Vmovementsto said'feed'-` dog and vto cause said Vfeed-dog to have'a Vrolling contact with the fabric. throughout shafts, operative connections'"between one of 130 115 fabric engaging surface, means for vibrating said rock-shafts and said rock-lever for adapted to intercept the downward moveimparting feeding movements to said feedment of the feed-dog to cause lifting movedog, operative connections between the ments of the presser-bar alternating with 10 other rook-shaft and the feed-dog carrier the rising movements of the feed-dog.

5 for rocking said feed-dog carrier upon its In testimony whereof, I have signed my fulcrum to impart rising and falling movename to this'speeiicution.

ments to said feed-dog, and a throat-plate ALBERT H. DE VOE.

Copies o1.' this patent may be obtained for iive cents each, by addressing the Commissioner of Patents,

, Washington, I). C.

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