US136823A - Improvement in sewing-machines - Google Patents

Description

UNITED STATES PATENT OrFIoE.

JOHN v. D. ELDREDGE, or DETROIT, MICHIGAN.

IMPROVEMENT m SEWING-MACHINES.

Specification forming part of Letters Patent No. 136,823, dated March 18, 1873.

To all whom it may concern:

Be it known that I, JOHN V. D. ELDREDGE,

of Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Improvement in Sewing-Machines; and I do declare that the following is atrue and accurate description thereof, reference being had to the accompanying drawing and tothe letters of reference marked thereon and being a part, of this specification.

This invention relates to the feeding mechanism of a sewing-machine and consists, mainly, in the combination of a spring-latch with a feed-actuating bar of peculiar construction, as will be fully described hereinafter.

In the drawing, Figure 1 represents a perspective view of the lower side of a sewing machine having my improvement ap-' Fig. 2 represents a side ele-* plied thereto. vation of a portion of the feed-actuating bar. Fig. 3 is a sectional elevation of the feed-piece. Fig. 4 is a plan view of the needle-plate; and Fig. 5 is a perspective view of the upper end of the feed-piece.

in Figs. 1 and 3, to cause one part to pro-.

ject beyondthe line of the other, and being also provided upon one side with a peculiarlyshaped cam, c, which has its edge formed in a curved line, as shown in Fig. 1, and is also constructed of wedge-like form, itsupper and lower face lines converging to a point at the one end, as shown inFig. It represents the feedpiece, provided at one end with a transverse slot, in'which moves the feedactuating bar P 5 and at the other with a slot, (1, inwhich rests a pivotpin, f, upon which the feed-piece-vibrates in its upward and downward movements.

This feed-piece moves longitudinally in the guide-box e, by means of which it is held from displacement; and is further provided with a latch, k, upon which rests the free end of the spring Z; and also with the usual denticulated portion 9, which extends upward through an opening in the plate, as shown of the feed-piece B, and, consequently, ele-v vates the front end of the latter. The first part of the forward movement of the feedactuating bar then causes the flat end of its cam to engage with the end of the latch is attached to the feed-piece, by which means the latter is carried forward against the force of the spring S. The latter part of the movement of the feed actuating bar causes its lower portion to come in contact with the lower surface of the slot, by which means the front end of the feed-piece is drawn downward; and at this time, also, the cam 0 having passed the latch k, the feed-piece is left free to move backward through the action of the spring S.

For the purpose of preventing the feedactuating bar from actuating the latch k in its forward movement, and thus causing the feed to move forward at the wrong time, the cam c is made of wedgeshape, so that its point passes behind the latch and elevates it, as shown in Fig. 4,without affecting the longitudinal position of the feed iece.

p The described construction gives the desired movement of the feed in harmony with the other'movements of the machine.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of the feed-piece R having the spring-latch k, with the feed-aotuaiing bar 1?, substantially in the manner deating bar P having the wedge-shaped 0am c, scribed.

as described. J OHN- V. D. ELDREDGE. 2. The slotted feed-piece, provided with the denticulated part g, latch is, and spring W'itnesses:

1, working in guides e, vibrating therein on H. F. EBERTS,

the pin f, and reciprocated by the feed-actu- MYRON H. CHURCH.

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