US2350807A - Feeding mechanism for sewing machines - Google Patents

Description

' June 6, 1944.

F. PARRY FEEDING MECHANISM FOR SEWING MACHINES Fi'l ed Sept. 17, 194,: 2 Sheets-Sheet 1 June 6, 1944. PARRY FEEDING MECHANISM FQR SEWING MACHINES A 2 Sheets-Sheet 2 "I u u I 1 n n fl T L m a v I. n 3 w a I n U Z n "M W I11. n In H L. 1. n 5 H w .W, M M m w a MI I. a n

Patented June 6, 1944 FEEDING MECHANISM FOR SEWING; 5. Frank Parry, d t, 001m... as nor to Thfl vSinger Manufacturing Company Elizabeth: i N. .L, a corporation of Ne Jgrsgy i I 7 a H Application. September 17, 19 as ri i No. sow-315 2'Clairns. (oi in amy fl hisinvention relates to Work-feeding mech- I anismsfor sewing machines and has for its objectto simplify and to improve'the efficiency of thetfeed-dog actuating mechanism of a sewing machine having a loop-taker rotating in a plane transverse to the line of feed. of the work.

. Other objects of the invention will beapparent from the following description and claims.

7 The invention consists in the devices,--comhina'- tions and arrangements of parts hereinaftende:

scribed-inconnection with the accompanying drawings, which illustrate a preferred embodiment of the invention and in which:-

Fig.1 is a top plan view of the bed-plateaof the sewing machine; the throat-plate and'adjacentrslide-plate havingbeenremoved and the bracket-arm securing bolts and pins being shown in section. -.Fig. 2 represents a verticalgsection longitudinally of a portion of the =bed-plate,; the section being taken substantially centrally 'of the-width of the bed-plate. Fig. 3. representsan enlarged vertical sectiontaken longitudinally of a portion of the bed-plate and substantially on the-line 3-3 of Fig. 1. Fig. -4 represents ,an enlarged vertical section taken,crosswise of ;the

bed-plate on substantiallytheline 4-4;ot;.Fi-g-.;1-. I

Fig. #5 represents an enlarged vertical section taken crosswise of the bed-plate on substantially the line 55 of Fig. 1. r -12 -The sewing machine shown in the drawings, has a frame including a bed-plated! which, to ether with th usual throat-plate l |,=slide-'plate l2 and cover-plate l2 suitablysecured uponthevbedplate provide a horizontally disposed work-support-.0 i a a I receive a fulcrum=pin 41 carriediby the ripsta'n'd j D epending from the bed-mate ma therearward side thereof are three spaced bearing-lugs J3, l4 and; l 5-, in which is journaled a horizontally disposedrotary, bed-shaft I .6 the; bearing-lugs 3.;:and.;:t4 being provided with bearing-bushings l.1.;and l8, respectively,,and the-bearing-lug'fi beingsproyided-withia' ball-bearing I!) for the shajt l'fi. One end 'ofthe shaft l6 carriesa peripherally grooved belt-pulley 28' engaged by a belt 2-lrfordrivingthe shaft 16; Y

' o p n ng are rollers%49 g.

secu-redupon the shaft l6;-adjace'nt-the 'oppo site-end thereof andloy serewsz22, is the hub-of a=spiralgear. 23 disposedxadjacent the left-hand bearing-bushing I! of the'sha'f-t IS; The spiralgear 23'is in driving engagementwith a reduced spiral-'gear-Msecured by ar'sc'rew 25 upon a horizontally disposed loop-taker shaft .26 intermediatefthle-fends oflsaid shaft 26. The loop-taker shaft 26 is disposed above the level of and extends transversely of the rotary shaft l6; said shaftZS being 'journaled iadjacentcits opposite ends in ball-bearings-rzlrand 28=disposed in bear:- ing-lugs 29 and .39.;respectivelyrrThe'driving; gear '23 and driven gear 'MhaYe aratiosuchas to transmit --two 'rotationsto the shaft 26 for each rotation ofthesha-ft-ifi: v ir- At its forward end, the shai't 2ficarries aloop= taker 3|0f1l3h'e horizontal axisrotary hook type particularly adaptedi for use: in zigzag: stitching machines. "The loop-taker 3 I1 is iidisipo'sed; "subastantially =medianly "ofthe width of the" bed plate. Journaled intheiloopr-taker 31 isthe roar rier 32' of a thread-casey33 which-is .removably latched in the carrier;.:said carrier-being notched to receive a stationary armrflftherebyito e strain the carrier against rotation with the-l p; taker3l; i

."I'he' throat-plate I I is provide'd-with-th usual feed-slots 35 to 'reciveuthe' several serrated see tions "of a lower fonr-inbtiomtype of rtvork=ad vancing rfeed-dog 36; wheieby'ithe 'feed-ldog" may operate through the work support to. advance the work crosswiseof the'bed-plate. The feed-do'g' 36 overhangs. the loop-taker 3'l and'is scure'd by screws31'upon'a horizontally disposed feed-bar 38 which extends horizontally crosswise of he bed-plate l0."

The forward end of the feed' ba'ck 8 1s crme'd into a sleeve 40 which is elongated-'- p tured transversely of the feed-bar topivotally ing and laterally spacedarms 42 0f a feed d vance rocker 43." The "left-hand end'f'of" th' huli of the'feed rocker 43 hasa'n airial cylindrical opening 44 enteredlehgthwise of-"theb"ed plate'* lll bvthe reduced cylindrical exten'sionfi ofa lpintl'e 46; said pint1e 46 being endwisadjustablyse cured bya screw 41:: ina suitably:'aperture'd bear ing-lug 148 depending mm thef orwardbo tion 3 of the bed-plate Hi.- Interposed' "-htween 5th? pintle-extensiorr 45 and the he'aring wall bfaitl i fpluralityiof' 'rieedle Atits opposite endithe hub; fthe' iee'd rocleer has a reduced cylindricalipdrtion' '50 thereof extending "beyond the ''righ'tf-hand "feed roeler 7 arm 42 the extensicn po'rtiori'50 likt'e'wise" having an axial opening to rec'eive 'th'e reduced poi tio'ii ofla pintle'il andthe'=needlerollei's 52 'wliibli form 'a' fbearing for 1 that end or the feed -"lbckeri Theepintle 5] is securedb'ya screw- 53 ifor erfd wise adjustment in a bearing-lug *54 depei 'd-ihg from the-bed-plate' lfl. 'Ihe described cbnstruc tion provides for rocking movements of the feedadvance rocker about an' axis parallel to the bedextends through the transversely "apertured forward end of a horizontally disposed pitman 58; needle-bearing rollers 59 being preferably interslight angular adjustment of the feed-rocker arm 56, while the height of the feed-dog may be readily varied by turning the eccentric connection-pin 62.

Having thus set forth the nature of the invention, what I claim herein iszj p 1. In a sewing machine having a-frame including a work-support, in combination, a rotary actuating shaft disposed below said work-support, feed-advance and feed-lift actuating ecji centrics carried by said shaft, 2. feed-advance "J.rocker fulcrumed upon an axis substantially parallel. tothe axisof rotation of said actuating posed between the pin 5'llandfthe pitman 58.

The rearward end of the pitman 58 has a. strap 58' embracing an adjustable feed-advance eccentric 60 carried by the bed-shaft H5. The eccentric 60 may be of any usual or suitable construction; the eccentric shown in the accompanying drawings being'structurally similar to that fully disclosed in the'U.S. patent of W. Myer s, No.2,128,031; Aug. 23, 1938.

'The rearwardend of the" feed-bar 38 is transversely 'apertured to receive the eccentrically reduced portion (H of a connection pin 152i said reducedportion' 6| of the pin being releasably secured in set position in the feed-bar by a screw 63; The connection pin 62 is journaled by means of"ne'edle'-be'aring rollersfi r'in the apertured facilitate turning adjustment'of said connection pin, thereby adjustably to reposition thefeeddog-36.1 W 1 J The lower end of the feed-lift pitman 65 has a shaft and having arms extending in opposite ldirctionsf from the fulcrum-axis of said rocker,

a feed-bar having one end thereof pivotally connected to one of-th'e arms of said feed-rocker, a

strap 61' embracing-a feed-lift eccentric 68 suit- 7 ably secured upon rthe 'bed shaftjI'Bfbr rotation therewith and disposed between the loop-taker driving-jgear 23 and the feed-advanceeccentric 60." :Thefeed-ban38 in its endwise'movem'ents impartsl oscillatory movements to the feed-lift pitman 65 about the-eccentric 68.

The feed H advance and feed-lift"m0vements transmitted to'jthe feed-bar; 38* through 'the'describe'd connections are timed to impart to the feed-dog 36 the conventional four-emotion movements for "advancingthezwork; 1 Thefdescribedconstruction provides a, simple formipofiwork-feeding. mechanism in a sewing ,machine having ;a horizontal-axis, loop-taker work-advancing feed-dog carried by said feedbar, a feed-advance pitman having one end pivotally connected to the other arm'of saidfeedrocker, said feed-advance pitman having at its other'end'a strap embracing said feed-advance 'e'ccentri a feed-lift pitman pivotally connected to the end of said feed-bar remote from said rocker andhaving a strap embracing said feedlift eccentric, a rotary 'loop -taker disposed between said feed advance rockerand said feedli'ft' pitman, a loop-taker shaft journaled below said work-support for rotation "about an axis substantially" parallel to the'Q-linef of feed and disposed above the level" of the axisof rotation of saidactuatingf'shaft, and loop-taker driving connections between said rotary" actuating shaft andsaid loop-taker shaft;

2. Ina ewinginachine having a frame in- -'cluding alhorizontally disposed work-support, m -mmbmamma rotary actuating shaft dis"- pos'ed horizont'allybelow and extending length- Wisofsaid work support at the rearward side thereof};feed-advance and-feed-lift actuating eccentrics carried by said shaft, a feed-advance rocker 'pivotally mounted below and at the forward side of said work-support. for rocking r movements" aboutfa' stationary axis substantially paraIIeI' tO' the 'rotation axis of said actuating 'shaitl saidr'ockerhaving u wardly and downwardly extending arms, means providing for angular adjustment of said arms relatively to each other, a horizontally" disposed feed-bar having 'the forward end thereof pivotally connectedf to sa'i'dfupwardl'y extending arm offthe' feedad vance rocker, a work-advancing feed-dog car- 1 'ried 'by' said "feed b'ar; horizontally disposed stantia-lly parallel to the line 'of feed: The feed ban-nevertheless; is of 'longsparr b'etween 'the feed'elift' amd :feed advance connections there'- 'wlth-,--whereby minimum tilting of the feed-dog occurs. The feed-advance pitman 58 "is; disposed'substantially'i normal "to the rock-arm 56 of -the feed-rocker; of "which the arms flare substantially normalto 'the feedbar 38, thereby obtaining ;maximum 1 'efliciency in transmitting workadvancing and-returnmovements to' the feed-dog from the "eccentric 60. Likewise, ":the feedirliftpitman 65 is disposed substantially nor maltolthefeedrbar 38"for'the samepurpose; ..;'I he,feed-dog 36- maybe conveniently adjusted lengthwise of wthe throat-plate feed-slots by,

feed-advance pitman having one end thereof pivotally' connected'to said downwardly e'xte'nding'arm of: the feed-advance rocker; said feed-- advance :pitman having at" its other end a strap embracing said feed-advance eccentric," aiver ticallyl' disposed feed-liftpitman having "the upper end thereof 'pivotally {connected to the rearward end of 'said' feed-'bargsaid feed=lift pitman having 1 at its-lower end a strap embracing said feed-lift eccentric,a rotary" loop-taker ms: posed between said "feed-advance" 'roclier" and said feed-lift-pitma'n'; a loop-taker shaft jcurr naled below said work-support for' rotation about a horizontal axis transverse to and disposed 7 above theflev'el ofvthe a'xis of r0t'ation"of"said actuating shaftj 'and 'intermeshing 'driving'and driven" gears carried by said actuating and loop taker shaft [FRANK mm?

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