US1917757A - Feeding mechanism for sewing machines - Google Patents

Description

July 11, 1933. EAMES 1,917,757

FEEDING MECHANISM FOR SEWING MACHINES Original Filed Nov. 23, 1929 2 Sheets-Sheet 1 Ill/(011111111110111111011111! 25 4 I 3mm Gemye M Ear-mes M 11, 1933. G M. EAMES 1,917,757

FEEDING MECHANISM FOR SEWING MACHINES Original Filed Nov. 25, 1929 2 Sheets-Sheet 2 Patented July 11, 1933 UNITED .STATES PATENT OFFICE GEORGE E. EAHES, OF BRIDGEIPORT, CONNECTICUT, ASSIGNOR TO THE SINGER MANU- FACTUBING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY This invention relates to sewing machines, more particularly of the feed-ofi-arm type having a horizontal work-supporting arm free at one end and supported at its other end by a vertical arm which, in turn, is supported by a horizontal arm suitably joined to the main frame-work of the machine. ilhe invention has for an object to provide simplilied and eficient feeding mechanism within the work-supporting arm.

The invention comprises the devices, combinations and arrangements of parts hereinafter described and claimed.

The features of the invention and the advantages attained thereby will be readily understood by those skilled in the art by the following detailed description of a preferred embodiment of the invention illustrated in the accompanying drawings in which Fig. 1 is a side elevation of a feed-ofi-arm sewing machine with the work-supporting arm in vertical longitudinal section. Fig. 2 is a front elevation of the machine with the parts which enclose the feeding mechanism in vertical section. Fig. 3 is a side elevation of the feed-bar actuating mechanism detached from the machine, and Fig. 4 is a top plan view of the feed-bar in the work-supporting arm.

The machine, in its preferred embodiment, as disclosed in my copendingI application, genial Number 409,224, filed 1929, of which this application is a division, comprises a gooseneck 1 of standard construction having at its overhanging end the usual head 2 for the reciprocating needle-bar 3 and the presser-bar 4. The needle-bar 3 carries the needles 5 and the-presser-bar carries the usual resser-foot 6. The needle-bar is reciprocated by the usual link 7 with the crank 8 on the main-shaft 9 disposed horizontally within the overhanging member of the gooseneck 1 and at its rearward end carrying the clip-belt pulley 10 and balance wheel 11 with the main power-receiving V- groove pulley 12.

Secured to the seat 13 at the front side of the bend in the gooseneck is the one piece hollow arm casting comprising the usual forwardly projecting arm 14, the laterally exovember 23,

FEEDING MECHANISM SEWING MACHINES tending arm 15, the vertically de ending arm 16 carrying the horizontal wor -supp0rting 17 terminating at its free end below the head 2 of the gooseneck. J ournaled in the bearing bushings 18, 19, Fig. 2, is the countershaft 20 which is disposed within and lengthwise of the laterally extending arm and is used to drive the loop taking and feeding mechanism within the work-supporting arm 17. The shaft is extended outside of the frame arms 14, 15 beyond the bearing bushing 19, and has fixed to such external extension a clip-belt pulley 21 which is connected to the pulley 10 by the clip-belt 22 around which is secured the belt guard 23 having a removable side cover 24.

Mounted on the fulcrum pedestal 25 within the work-supporting arm 17 is the eccentric shank 26 of the fulcrum pin 27 embraced by the fulcrum block 28 on which rocks and slides the feed-bar or feed-lever 29 carrying the feed-dog 30. Fulcrumed on a fixed axis constituted y the stationary cross-pin 31. in the vertical arm '16 is the feed-advancing lever 32 the lower forked end of which embraces a block 33 on the pivot pin 34 passed through a hole in theend-ofthe feed-lever and fixed by a set screw 35, Fig. 2, in a hole in the lower end of the feed-lift pitman 36 the upper end of which embraces the feedlift eccentric 36 on the shaft 20. The upper forked end of the feed-advancing lever 32 embraces the bearing blocks 37 which embrace the adjustable feed-advance eccentric 38 mounted on the shaft 20 between the bearings 18 and 19. By turning the fulcrum pin 27 with its eccentric shank 26, the working level of the feed-dog may be adjusted.

' Variations in the stitch length are effected by adjusting theeccentric 38; the fulcrum 31 of the feed-advance lever 32 remaining at all times fixed relative to both frame arm 16 and the feed-advance lever 32. This is an important desidcratum inasmuch as no openings or slots ar required to be formed in the frame for effecting fulcrum adjustments of the feed-advance lever, through which open ings or slots oil is likel to be spattered with the inevitable result 0 soiled work.

flriginal application filed November 23, 1929, Serial No. 409,224. Divided and this application filed August Serial No. 554, 03. i

Having thus set forth the nature of the invention, what I claim herein is 1. Feeding mechanism for sewing machines having a feed-bar fulcrumed between its ends for rocking and bodily endwise,

movements, a feed-lever fulcrumed to rock on a fixed axis and disposed substantially normal to said feed-bar, a pin-and-slot sliding connection between said feed-bar and feed-lever, an actuating shaft, an adjustable eccentric on said shaft connected to actuate said feed-lever, a feed-lift eccentric on said shaft, and a pitman connection between said feed-bar and said feed-lift eccentric.

2. Feeding mechanism for sewing machines having, a feed-bar fulcrumed between its ends for rockin and bodily endwiso movements, a feedg mounted on one end of said feed-bar, a rotary shaft, a feed-lift eccentric on said shaft, a itman embracin said feed-lift eccentric and having a ivotai connection with the other end of sai feedbar, a feed-advance eccentric on said shaft, 9. feed-advance lever, a fixed fulcrumfor said feed-advance lever, said feed-advance lever being forked at its upper end to embrace said feed-advance eccentric and being forked at its lower end to embrace the point of pivotal connection of said pitman to said feed-bar.

3. Feeding mechanism for sewing machines having an upper horizontal arm, a

In testimony whereof I have signed my.

name to this specification,

' GEORGE M. EAMES.

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