US216791A

US216791A - Improvement in feeding devices for sewing-machines

Info

Publication number: US216791A
Authority: US
Publication date: 1879-06-24
Anticipated expiration: 1896-06-24

Description

W. 0 GROVER. Feeding Devices for Sewing-Machines.

No., 216,791. Patent ed June 24, 1879.

N-FETERS, PHOTO-LKTHQGRAPHER. WASHINGTON D C UNITED STATES PATENT OFFICE.

WILLIAM O. GROVER, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN FEEDING DEVICES FOR SEWING-MACHINES.

Spec fication forming part of Letters Patent No. 216,791 dated June 24, 1879; application filed January 29, 1879.

To all whom it may concern:

Be it known that I, WM. 0. GROVER, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in FeedingDevices for Sewing-Machines, of which the following description, in connection with the accompanying drawings, is a specification.

This invention relates to sewing-machines, and has special reference to the construction and mode of operation of the feeding mechanmm.

In this my invention a four-motioned feeding device has its rising or grasping and forward or feeding movements imparted to it by a single cam on a rock-shaft located below the cloth-plate.

Figure 1....is an end view of a sewing-machine cloth-plate with the feed-bar depressed; Fig. 2, a similar view in section with the feed-bar elevated and moved forward; and Fig. 3 is an under-side view.

The shaft at, below the cloth-plate will, by a crank-andlink connection, or by any other usual mechanism, be rocked froma rotating shaft of the machine, which rotating shaft will operate the needle-bar and other parts of the machine in any usual Way. At the forward lever d or the spring 6 thereon is, in that figure, as in Fig. 3, so placed as to check the backward movement of the said bar, the shoulder 2 meeting the said spring and preventing the projection f of the feed-bar from receding to the face 40f the cam. The feed-bar is moved backward after each stitch by the spring g, located upon the part h of the bar, until the shoulder 2 meets spring 6, and the spring so receiving the shoulder reduces the noise usually accompanying the working of the feed"- bar. The end 3 of the feed-bar is acted upon by a depressing-spring, i, which always exerts a tendency to depress that en of the bar toward the cam I), while the spring It acts as a stop to hold the end 3 of the feed-bar and prevent it from being thrown backward by spring 9 while it is descending under the action of spring '5 until the cam 1) moves from the position shown in Fig. 2 nearly to that shown in Fig. 1.

I claim-- 1. The feed-bar and rocking shaft and single cam thereon, combined with the depressingspring and yielding stop at the end 3 of the bar, to operate substantially as described.

2. A feed-bar provided with a shoulder or projection, combined with a stitch-regulating lever provided with a spring-arm, to act against its shoulder and check the backward movement of the feed-bar, substantially as described.

3. The combination, with the feed-bar and means to impart to it its feeding motions, of a yielding stop, to co-operate with theforward portion of the feed-bar, substantially as described.

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

WILLIAM o. eRovER.

Witnesses:

G. W. GREGORY,

L. F. OoNNoR.