US1146437A - Feeding mechanism for sewing-machines. - Google Patents

Description

G. E. MOLY NEUX FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FII ED JUNE 25, I913.

-" .11, 146,437; Patented July 13,1915.

" "WITIVESSES: C

' INI/E/VTOR zaww v ATTORNEY 5 (UNITED STATES PATENT omomf GEORGE E. MOLYNEUX, OF BAYONNE, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW J ERSEY FEEDING MECHANISM FOR SEWING-MACHINES.

Application filed June 25, 1913. 4 Serial No. 775,639.

following is a specification, reference being had therein tothe accompanying drawlngs.

This invention relates to an improvement in feeding mechanism and is designed more particularly for embodiment in such mecha-' nism employed for feeding the work longitudinally of the work-support of a cylinderbed machine.

It has for its object partly to provide strong and rigid supporting means for the feed-dog, so as to prevent excessive springing of the latter in engagement with the work, and partly to'provide a convenient and effective means of adjustment for the length of throw of the feed-dog in advancing the work to space the stitches.

In the preferred form of the improve.- ment, the machine has a rotary shaft passing through the hollow standard and'the tubular work-supporting arm and carrying within the standard the feed-actuating eccentric and within the work-supporting arm two longitudinally spaced feed-lift eccentrics. The feed-actuating eccentric has a centric is embraced by a strap at one end of a pitman whose opposite end is connected with one arm of arocker mounted upon a fixed fulcrum-stud and having a second arm connected by a link with the rearward end of the feed-bar carrying the feed-dog to which it imparts the usual to-and-fro feed ing movements.

The feed-bar is slidingly mounted in spaced bearing members, sustained at the upper. ends of posts having at their opposlte ends straps each embracing one of thefeedlift eccentrics, thereby maintaining the feedbar in substantialparallelism with the worksupport. relative lengths of the supportingposts may be varied or the relative throw of the feed- It is obvious, however, that the Specification of Letters Patent. PatentedJu1 y13, 1915;

lift eccentrics modified to correspondingly.

change the position and'character'of move-' ment of the feed-bar, if desired. v

In the accompanying drawings, Figure 1 is a side elevation, partly in section, of the 2 lower portion of a cylinder-bed machine or the well-known Singer type and constructed substantially in accordance with my application Serial No. 593,796, filed November 23, 1910. Fig. 2 isa plan, partly in section, of the feeding mechanism. Fig. 3 is a perspective -view of a portion of the feed mechanism and the main-shaft, showing the means ofv adjustment of the feed-actuating eccentric. Fig. 4 is'an end view ofthe eccentric bushing, Fig. 5 a perspective view, and Fig. 6 a face view ofthe feed-actuating eccentric and its carrier, and'Fig. 7 is a perspective view of one of the feed bar sustaining posts.

As represented in the drawings, the machine is constructed with a frame comprising the hollow standard 1 to 'one side of which is secured the tubular work-supporting arm or cylinder-bed 2 passing through which is the main-shaft 3 journaled in suitable bearings and carrying at its rearward end-the belt-pulley 4: formed with the cylindrical rim 5. At'its outer end the arm 2 is providedwith the removable end cap 6 and with the throat-plate 7 through which reciproqates the needle 8 carried by theflnee dl'e-- bar 9, and upon which rests the presser-f'oo'fv 19 whose shank 11 is secured to the presser-- bar 12.

bar 18 having at its rearward end the block 19 carrying the pivotal stud-screw 20. To the feed-bar lsj between the blocks 17 and The throat-plate haslthe\usual aperturesi9 v 13 through which pass the serrated work-' 19, are fitted the bearing sleeves 21 each pro vided with the transversely extending bosses 22 and p'ivotally mounted by means of the stud-screws 23 between the divergent-arms 24: of the post Whose opposite end formed with a split sleeve or strap .26 embracing one of two spaced teed-lift eccentrics 26 upon the shaft The stud-screw '20 passes through the apertured extremity of the block 27 adjustably secured upon one end of the bent pitman rod ib'ivhose opposite end is provided with a strap '29 having a spherical socket to embrace the ball-stud. upon one arm 31 of the plnralarmed rocker having its ubular hub 3:2 journaled upon thel'ulerum-stlul 33 sustained by the lug 34. upon the. inner wall of the standard l. A second arm 3-3 01' said rocker is provided with the ball-stud 36 upon which is fitted the strap 37 at the outer end of an eccentric rod 38 whose opposite end is formcd with the strap 39 emln-acing thev teedactuating eccentric 40 which is termed at one edge with the lateral ilangell having the oppositely extending aperturcd cars-l2.

Substantially as shown in my Patent No. 102L691. oi April 30. 1 1:1. the shaft 2) has secured thereon within the hollow standard ,1 the collar 4 provided with the tlange ll WYit-hin this cavity 1s fitted the periphcrah bearing face of an eccentric sleeve is loosely fit-ted upon the shaft 3 and provided at one edge with the circular flange 49 having the laterally projecting rim 510 formed with .the peripheral detent notch 51. The notch 51 is adapted to be entered by the inwardly projecting tooth 52' upon the head 53.01? a plunger-pin 5t journaled within the tubular socket member 55 which enters a suitable apertin'e in the rear wall of the standard 1 and having a foot 56 secured within a countersunk recess 57 in the rear face ofthe standard by means of the screw 58.

The socket of the member 5:3 is shouldered in its outer portion to receive one end of the spring 59 surroumling the plunger-pin 54 and having its opposite end in contact with a shoulder loi'nicd by a nut 0 applied to the reduced and threaded outer end of the plunger-pin. -ts relu'escnted in Figs. 1 and 3. the rim .3 of the bclt-pullcy is provided upomone. side with a series of graduations forn'lin g a scale .3 and is overhung by the wedge-shaped extremity 1 of a pin 62 projecting from the rear cover-plate (33 oft-he standard and serving as a pointer or indexfinger. v

.T he spring 59 normally maintains the plunger-pin retracted and the detent tooth 52 withdrawn from thenotch 51 of flange invention. what I claim herein is 50, but by pressure upon the nut 60, the toot-h 52 ma v be manually brought into contact with-the rim so so as to enter the notch :31 when the belt-wheel l is turned by hand. 'hen the eccentric sleeve lb is thus locked against movement. the further turning of thebelt-wlu-el. and hence of the shaft 3, will serve to shii't its position circularly relatively to its supporting shaft and correspondingly change its relation with the feedactuat-ing eccentric it) which will be thereby shifted toward or l'rom the axis of the shalt and the eccentricity of its operative lace changed accordingly. .-\s the scale 5' will assun'ieoperative relation with the. pointer .til when the sleeve becomes lUClttll against rotation. the scale and pointer w l indicate the throw or extent of operative movement. of the eccentric for the adjustment in which the bushing 48 is set.

The object of the elongated form of the cavity 47 is obviously to afford clearance {or relative movement of the bushing 48 and the eccentric 40 upon one diameter while they are locked for concurrent movement upon a diameter atright angles therewith and parallel with the slots 4!) of the flange 44. As will be observed. the bushing 48 is normally prevented against turningrelat-iv'ely to the shaft by its friction with the latter and with the eccentric 40, the latter being frict-ionally held in position upon the flange 44 by the stud-screws 4G.

The cavity 47 is so positioned relatively to the outer face of the eccentric 40 that when the bushing 48 is in one extreme position the eccentric 40 has its minimum' throw, and when the bushing 48 is shifted into the opposite extrci'ne posit-ion the ecccn-' tric will have. its n'laximum throw.

The operation of the feeding mechanism as thus described will be obvious without- -fll1l'lltfl' description.

Having thus set forth the nature ofthe 1. In a sewing machine. in combination, a shaft. a feed bar. actuating means for imparting endwisemovements to .said feed bar. a plurality of lifting elements mounted upon and spaced apart endwise of said shaft. and a plurality of members independent of said actuating means engaging said liltingelements and each connected with and affording a support for said teed-bar.

111 a sewing machine. in cmnbination,

a shaft. a feed-bar. means for in'iparting to said feed-bar endwisc movements. a plurality of eccentrics fixed upon and spaced apart endwise of said shall. and a plurality of posts each formed with a strap embracing one of said eccentrics and having a connection with said feedbar.

3. In a sewing machine. in combination, a shaft, :1 feed-bar. an actuating element unon said shaft, a connection between said element and the feed-bar and including a link pivotally attached to the latter for imparting to it endwise movements, a plurality of lifting elements fixed upon and spaced apart endwise of said shaft, and feed-bar sustaining members engaging said lifting elements.

' tion between another arm of said rocker and said feed-bar, aplurality of feed-lift eceentricsfixed upon and spaced apart endwise of said'shaft, and sustaining members each provided with a .strap embracing one of said feed-lift eccentrics and connected gvith and affording a support for said feed- 5. In a sewing machine, in combination, a shaft, a feed-bar, an eccentric bushing mounted upon and circularly adjustable relatively to said shaft, a feed-actuating element mounted upon said bushing, a driving connection between said element. and shaft,

and an operative connection between said elementiand thefeed-bar.

6. In a sewing machine, in combination,

a shaft, a feed-bar, a feed-actuating eccentric formed vvlthan elongated aperture embracing 'said shaft, an eccentric bushing journaled upon and frictionally held against rotation on said shaft and entering and contacting with the opposite walls of the apers ture of said eccentric, means for detaining said bushing while the shaft is turned to shift it circularly thereon, a driving connection between said eccentric and shaft, and an operative connection between the feedbar and said eccentric andincluding a strap .7

embracing'tmlatter.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses.

GEORGE E. MOLYNEUX.

Witnesses: I a

HENRY J. MILLER, HENRY A. KoRNEMANN, Jr.

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