US355735A - Simon w - Google Patents

Description

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' S. W. WARDWELL, J1.-

FEEDING MECHANISM FOR SEWING- MACHINES.

No. 355,735. Patented Jan. 11, 1887.

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V UNITED STATES PATENT OFFIC SIMON W. WARDWELL, JR., or woonsocxnr, RHODE' IsLAND, ASSIGNOR TO WILLIAM P. EARLE, TRUSTEE, or BRQOKLYN, NEW YORK.

FEEDING MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. {355,735, dated January 11, 1887.

' Application filed March 3, 1886. Serial No. 193,898. (No model.)

To call whom' it may concern.-

Be it known that I, SIMON W. WARDWELL,

Jr, a citizen of the United States, residing at- Woonsocket, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Feeding Mechanisms for Sewing-Machines, of which the folthe cam is of that extended character which is desirable in this class of devices, the vertical movement imparted by the same cam is greatly reduced.

My invention further consists in the arrangement of levers for transmitting motion from,

the driving-bar to the feed-bar. g

In the drawings, Figure l is apart sectional plan of sufficient of a sewingmachine to illustrate my invention. Fig. 2 is a transverse section on the line 1 2, Fig. 1. Fig. 3 is a side view looking in the direction of the arrow,

Fig. 1.

My improved feed may be used in connection with any form of sewing-machine. For the purpose of illustration, I have shown it in connection with the bed of a Wheeler & WVilson machine, A representing the bed of the machine, having a recess to receive the work-plate B, and below the bed is a cross web or flange, 0, through which extends the shaft D, carrying at the forward end the usual revolving hook, G. The feed'dog a is carried by a horizontal bar, E, lying below the'bed, in groove 00 thereof, the dog projecting through slots in the work-plate, and at the rear of the revolving hook G, upon the shaft D, is a cam,

b, which imparts all the movements to the feed-dog. The bar E derives its longitudinal movement from a lever, H, pivoted at the rear end to a screw-stud, I, adjustable in a slot, q, in the bed of the machine, and having at the front end a groove or slot, to, which receives a pin, 93, extending downward fromthe bar E.

To an ear, 0, projecting from the plate A is.

pivoted by a'pin, d, a lever, J, having at its inner end a slot, e, to receive a pin,f, at the under side of the lever II, and at the outer end of the lever J is a hole to receive a pin, m, extending from a bar, K, having at theinner end a square frame or yoke, 71, receiving the cam b,

The vertical movement of the feed-dog is imparted by; the cam 12 through the medium of the driving-bar K and an intermediate lever, L,rocki11g at one end on a bearing-pin, g, bear 6o ing at the other end on the driving-bar K ata point between the cam and the pin m, and bent upward to form a bearing for the extreme end of the feed-dog. As the cam 11 revolves in the direction of its arrow it reciprocates the driv 6 5 ing-b'arK longitudinally, and thereby vibrates the levers J "H and reoiprocates the feed-bar E, and it also reciprocates the lever L vertically, and thereby lifts and lowers the feed-dog.

To change the length of the horizontalmove- 7o ment of the feeddog, the fulcrum of the levers may be changed. I prefer, however, the arrangernent shown, whereby moving the screwstud I in the slot q, the pinfis-moved nearer to or farther from the fulcrum of the lever J. 7.5

It is most desirable in sewing-machines to have the needle as short as possibleand this depends on the length of its mov'ement,which is governed by the operative distance of the hook or other thing whichcatches the needlethread below the top of the platedetermined by the'thickness of the plate and the thickness and vertical mot-ion of the feed-dog. It therefore becomes desirable to reduce this 1110- tion and the thickness of the plate as much as 8 possible and bring the hook as close as possible to the top of the work-plate. It is also desirable to use an operative cam for imparting the longitudinal motion which will give an extended throw, so as to lessen disparity of leverage and prevent multiplying play incident to wear; but when the 'cam is extended to'impart such extended motion, and is also used directly, as usual, to impart the vertical movement, it is not possible to bring the lat- 5 ter movement within the limits required to lessen'the length of v the needle, as desired.

By the construction shown I secure all'the movement required for the driving-bar with a minimum of vertical play for the feed-dog, :00 yet use only a single driving-cam. Thus the cam b is constructed to give an extended throw to the driving-bar K; but a much-diminished vertical movement (to the extent of one-half) is imparted to the feed-dog, owing to the arrangement of the lever L with its end bearing between the ends of the bar K and the bearing between its ends for the end of the dog. The dog is thus brought as close to the revolving hook G as is possible to leave room for the vertical play of the dog, the intervention of the lever L requiring no allowance for space, as the lever has a slot, 1), for the passage of the hook.

The extent to which the feed-dog is pro jeoted above the work-plate may be regulated by adjusting the lever L, which adjustment may be effected by turning the screw 9 to raise or lower the outer end of the lever, washers n being placed above or below the lever upon I upon the driving-bar and the dog. To effect this longitudinal adjustment, the screw g may be adjustable in a slot, at, in the bed-plate.

I do not limit myself to the precise arrangement of levers H J shown in connection with the other features of the device, as these features may be used in connection with other in tervening mechanism.

I claim- 1. The combination, in a sewing-machine, of a feedcam, a drivingba'r bearing upon said cam and reciprocated longitudinally and vertieally thereby, a feed-bar and lever connections between the latter and the driving-bar, and a lever interposed between the feedbar and driving-bar, and bearing upon each to reduce the vertical movement of the feed-dog, substantially as set forth;

2. The combination, with the feed-bar and driving-bar and cam operating the latter to move it longitudinally and vertically, of a lever pivoted at one end, bearing with the other end upon the driving-bar between the ends thereof, and having a bearing between its ends for the feed-bar, substantially as set forth. v

y 3. The combination of the feed-cam, drivingbar operated longitudinally and. vertically thereby, feed-bar and lever connections between the latter and the driving-bar for communicating longitudinal movements from one to the other, and a lever secured to an adjustable bearing at its outer end, having a bearing between its ends for the feed-bar, and bearing upon the driving-bar between the ends thereof, substantially as set forth.

4. The combination of the feed-cam, drivingbar operated longitudinally and vertically thereby, a lever, J, pivoted between its ends and connectedto the driving-bar at one end, a feed-bar arranged above the driving-bar, and a lever, H, pivoted at the rear end having a bearing upon the feed-bar and upon the lever J, and adjustable longitudinally, substantially as set forth.

5. The combination, with the drivingbar and feed bar of a sewing'machine, of a lever,- H, adjustable longitudinally and having a bearing upon the feed-bar, and a lever, J, pivoted .between its ends, connected at the outer end to the driving-bar, and having an elongated bearing at its inner end for a pin upon the lever H, substantially as set forth.

6. The combination, with the driving-bar and cam imparting bothlongitndinal and vertical reciprocating motions thereto, and with the feed-bar and connections between the same and thedriving-bar, of a lever interposed between the feedbar anddriving-bar and bearing upon each, to reduce the'vertical movement imparted by the cam to the feed-bar, substantially as set forth.

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

SIMON W. WARDWELL, JR.

Witnesses ROBERT MILLER, CHAS. H. REEVES.

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