US1280680A - Stitch-forming mechanism for sewing-machines. - Google Patents

Description

A. H. DE VOE.

STITCH FORMING MECHANISM FORSEWING MACHINES.

APPLICATION FILED NOV. 30. 1915.

Patented 0013. 8, 1918.

2 SHEET.SSHEET I.

WITH/E8858: INI/ENTOR f6. 85mm M 7 amigo By A. H. DE VO E.

STITCH FORMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. 30,1915.

Patented Oct-.8,1918.

2 SHEETS-SHEET 2.

WITNESSES. l/V VE IV TOR I By 7%, I

' A TTORIVEY UNiTEn STATES PA E T oFmo BE H- DEvon'oF-W smmw,N ERS Y; ASS GKQRX Q H 'IueEaMAurrno'run ve COMPANY, nooR PoRnTIoN on NEW JERSEY.

STITCH-FORMING MECHANISM FOR SEWING-MACHINES.

Specification bf Letters I-atent. P t t ppli ioncfiledN v mbs 51215. e a1; i. 21-

To allwhom it may concerni Beit known that I1, ALBERT H.\DIQ You,

a citizen of the United States, residing at W stfield, in h county of Uni n a d State of New Jersey, have invented certain new and useful Improvements in Stitch-Forming Mechanism for SewingMachines, of; which the following isa specification, reference being had therein totheaccompanying drawings. V i

This invention has for its object to pro vide means for layingone or more threads across the; path of a: plurality of needles in the formationof a cross thread stitch similar to that illustrated in thepatent toiBer ger No. 1,060,5 2 6, of Apri-l.29, 1913.

In the aforesaid patent .two cQiiperative implements are employed for laying the cross threads in front of the path of the needles, each. implement being carriedby a; rocker having a link connection, with second rocker fulcrumed upon the headofthesewing machine and given Operative movements from a cranksstud onthe oscillatory actu= ating shaft by meansof a 'pitman. 1 The two rockers which serve as carriers for the thread laying implements are pivotally mounted on the presser-bar, so; that it is necessary to provide two distinct, universal link conneca tions. between; them and the rocker mounted on the frame. I

By means of the present improvement all of the driving. members 01; the thread laying implements; are mounted directly upon the presser-bar with the exception of a; slid, ing drivingconnection on the needle-bar aetuating shaft; Furthermore theearrienior one implement receives" motion. from its oscillatory supporting shaft-and trianemits mo tion directly to itscornpanionimplement car-, rier, thus reducing-the-numberofi parts; to a minimum. I

e pr v ments e applied. o; h machine provided with the usual reciproeatory needle-bar mounted in the head of therover hanging-arm parallel withan endwise movable presser-ban Clampediupon the presserbar near its lower end-is thecollarlof an arm which supports a depending vertical stud afiording a, pivotal; support for a short rocking carrier arm. for one: of the thread lay: ing implements-.- The presser-bar-is formed with anaperture extending axially thereof to. receive an oscillatory shaft provided at its lower end with a T arm, one branch of the said, arm senving as a-carrier-fpr the sec} d read l ng mp m an he 1: branch a gm being connected; with and serving t v-ttans t a mi king mo ion; o the o m 01 m' e z- The; pp r ends ofith o c ll o y shaft h si ampe e eonveni peltulzed crank arm whieh is actuated through a slid: ng conn t n w t icrankr t n h a e at ng sha fi Wh n the pr s e an' S-ele vated to raise thepresser-foot above the Work, he h a n a ing; mp ement nd al i h diiv gir s erefon are b ly l edwlth the bar without disturbing their 7 relative positions, I

In the drawings, Figure 1 1s a v partly sec- Qf-wn e e at on of. a machi e em od ing the improvements, and Fig. 2 is afront nd; elev t on, hereo h t e. f e-p a i the ll t k fire ei,la sl d,- the: P e ser-bar being: hQWIl F m ly n ec iq -z E gw per pe tive ew of 1 est tQ onm nsk d hre de ey ngme ha m ig- & is a etai ew he t r ad y 11 mp ments. he r carriers and. centain, other connected parts; an E g- 5 s a Pe spe t v v ew h ng he stitch and the mannerin which. the thread laying implements. cooperate in fonningathe same. j w v I. Y

T .e-imPtMWHt e, b di d n a m k i e on t uc e i th he ual ba eLhd- 10w andardh d ubula ve ha ing rm 3; inthe head 4 oi which isj ournaled the vert callxpnoe t ng ne d er 5' pr v ded,

in he-xpne stanc with. th mult pleusual: link 1/1- with a rearwardly; projecting stud; arried the o lar xedupo need-lat r athmug hi h co e t ns he needles receive their operative movements from the rocleshaft 11, The needle-actuatingi wok-shaft has fixed upon its; rearward end collar with oppositely extending crank arms 16 and 17, the former of which is conwith the rearwardly extending arm 20 of an' elbow-lever mounted upon the transverse fulcrum-pin 21 and having an upwardly extending arm 22 connected by means of the pitman 23 with the rocking looper-carrier 24, upon which are secured the lower-thread carrying'looper 25 and adjacent needle-guard 26.

f Fixed upon the main-shaft is thefeedactuating eccentric 27 embraced bythe strap 28 of an eccentric-rod connected with the feed-rocker 29 which is journaled upon the fulcrum-pin 30 and has pivotally connected thereto'th'e rearward end of the feed-bar 31 carrying the feed-dog 32. The main-shaft has fixed thereon'the feed-lifting eccentric 33 upon which is fitted the slide-block '34 embraced by the depending yoke 35 of the feed-bar 31 by means of. which rising and falling movements are imparted to the feeddog32.- 7

Journaled'in the head of the overhanging arm and parallel With thefneedle bar is the presser-bar 36 having clamped thereon near its lower end by means of the screw'37 the split collar of a bracket 38 having a depending arm 39 embraced by the shank 40 of the presser-foot 41, a set-screw 42 serving to holdthe shank in position. The bracket 38 is formed with a lateral arm 38 apertured to receive a depending stud 43 serving as a pivotal support for a rocking carrier 44, the lower wall of the carrier restingupon the head 42 on-the stud 43, the stud being see cured in position upon the bracket-arm 38 by means of a'set-screw 45. Carrier 44 is 1 provided near its free end With a vertical aperture adapted to receive the shank 0t of the thread laying implement a which is secured in adjusted position by means of the set-screw 46." The second thread-laying implement b is provided with a carrier so 'arranged that its movements are utilized to transmit motion to its companion carrier 44, in the manner now to be described. t

Fitted within an aperture 0 formed axially s of the presser-bar, is an oscillatory shaft 47 which projects below the collar of bracket 38 and on which is secured by means of the setscrew 48 a radial-armed carrier 49,the arm 0 of the carrier being'apertured near its end toreceive the shank b of thread laying implement b, the latter being secured in adjusted position by means of the set-screw-50. The second arm at of the carrier 49 is utilized asa crank member to transmit motion to rock-arm 44, and therefore carrier 44 is proyided with an open slot or recess' 51 which receives the end of'carrier arm 21, a pin 52 The second crank-arin serving as apivotal connection between the two. s V

The presser-bar is formed in two sections,

the upper section 3o being connected to the lower section by means of a connector f. The connector is provided with upper and lowersleeves separated by a cut-away portion 53% "The lower section of the presserbar is clamped within the lower sleeve 53 of the connector and the upper section 36* of the presser-bar is reduced in diameter to snugly fit into the reduced diameter of the upper connector sleeve 54 which also receives the upper end of the oscillatory shaft 47 as shown in Fig. 2. ""Clamped upon that portion of oscillatory shaft 47 exposed by the intermediate cutaway portion 53 of connector f is the splitcollar 56 of a horizontally disposed crank arm 57 formed with a depending socket member 58 forming a part of a sliding connection between a crank-disk on the actuating shaft and the oscillating shaft 47. The socket, member 58 receives a slide-pin 59 formed with an apertured cross-head 59 embracing crank-stud 60 on the collar 12 fixed upon the actuating shaft. 1 In the arcuate movement of crank-stud 60 pin 59 will have a slight idle movement within the socket 58 to permit a dwell of the thread laying implements to hold the cross thread or threads in position during the descent of the needles and until the latter reach the work, and subsequently will be swung bodily back and forth by the oscillation of'the actuating shaft to impart a corresponding backward and forward movement of the thread laying implements in the repositioning of the cross-thread.

Having thus set forth the'nature of the invention, what I claim herein is 1, In a sewing machine, the combination with stitch-forming mechanism, of an endwise-movable supporting-bar, and a threadcarrier mounted to oscillate thereon, a second thread-carrier operatively connected with the first named thread-carrier, an oscillatory shaft carried by said bar and affording an axial support for the second threadcarrier, an d means for imparting operative movements to the said oscillatory shaft.

2. In a sewing machine, the combination with stitch-forming mechanism, of a supporting-bar formed with an axial aperture and a thread carrier mounted to oscillate thereon, a second thread-carrier operatively connected with the first named thread-carrier, an oscillatory shaft fitted within the aperture of the said bar and affording an axial support for the second thread-carrier, and means for imparting operative movements to the said oscillatory shaft.

" 3. 111 a sewing machine, the combination withstitch-forming mechanism, of means for laying the thread in front of the needle or needles comprising a thread-carrier, an oscillatory shaft alfording an axial support for the thread-carrier, an apertured crankarm carried by said oscillatory shaft, a rock shaft and a crank-stud carried thereby, and V a slide-pin fitted Within the aperture of the crank-arm and having a sleeve embracing the said crank-stud.

4:. In a sewing machine, the combination with an actuating shaft and stitcheforming mechanism including a plurality of needles and means for reciprocating the same, of a Presser-bar formed with an axial aperture, a shaft fitted to oscillate within the said aperture, a thread-carrying implement adapted. to lay thread across the path of the needles, a rocking carrier for the said implement, supported upon the oscillatory shaft,

, and a pin-and-socket sliding connection'between the said oscillatory shaft and the said actuating shaft.

5. In stitch-forming mechanism for sewing machines, the combination with a plu rality of reciprocatory needles of a presser- 7 bar formed with an axial aperture, an oscillatory shaft fitted Within the aperture of the presser-bar, a thread carrying implement, a rocking carrier for the said implement mounted on the lower end of the oscillatory shaft, a crank-arm carried by the oscillatory shaft at its upper end and formed with a socket, a pin slidingly fitted within saidsocket and provided with an apertured crosshead, a rock-shaft 'operatively connected with the needles, and a crank-stud mounted upon the said shaft and embraced by the apertured cross-head of the sliding pin,

6. In stitch-forming mechanism for sewing machines, the combination with a plu- Copies of this patent may be obtained for rality of needles and means for reciprocating the same, of a thread-carrying'implement, an oscillatory shaft, a rocking carrier fixed. upon said shaft and formed with an arm, a thread laying implement supported by the carrier, a second thread laying implement and a rocking carrier therefor, an

; operative connection between the latter carrier and the arm of the first carrier, and

means for imparting operative movements to the said oscillatory shaft.

7. In a sewing machine, the combination with a bed and an arm overhanging the same, of an actuating shaft supported by said arm, a needle-bar mounted in the head of the arm and operatively connected with the actuating shaft, an oscillatory shaft mounted in the head parallel with the needle-bar, a thread laying implement carried by the said oscillatory shaft, a crank-arm on the said oscillatory' shaft, a crank-stud on the actuating shaft, and a sliding driving connection between the crank-arm and stud.

8. In a sewing machine, the combination ALBERT H. DEv VOE.

five cents each, by addressing the Commissioner of IPatents, Washington, I). C.

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