US244578A

US244578A - pbeese

Info

Publication number: US244578A
Authority: US
Publication date: 1881-07-19
Anticipated expiration: 1898-07-19

Description

" n Model.)

J. S. FREESE.

BUTTON HOLE SEWING MACHINE.

7 BWWYM. WW Tw Patented July 19, 188 1.

N. PEYERS. PhnloJ-ilnompher, mum-m. n.c.

NlTED STATES PATENT OFFICE.

BUTTON-HOLE SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 244,578, dated July- 19, 1881.

Application filed May 4, 1881. (No model.) a

To all whom it may concern Be it known that I, JOHN S. FREnsE, a'citi-- zen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Button-Hole Sewing-Machines, of which the following is a specification.

This invention relates to certain improvements in the feed mechanism of a button-hole sewing-machine, such as described in Letters Patent of the United States, Nos. 183,333, 197,528, and 219,656. r This mechanism comprises a horizontallyrotating feed-wheel constructed with a-circular groove and a cam-groove, a feed-dog and a brake-dog, both engaging the circular groove and serving to adjust automatically the stroke of the feed-dog. In my present improvement the tail of the feed-dog extends over the head of the brake-dog, and thefeed-dog is acted on by a slide-bar which is guided in an adjustable cap, and directly acted on by a fixed and an automaticallyadjustable cam in the end of the feed-lever, as will be hereinafter more fully explained.

This invention is'illustrated in the accompanying drawings, in which Figure 1 represents an inverted plan. Fig. 2 is a top view of the feed-lever.

Similar letters indicate corresponding parts.

In the drawings, the letterAdesignates the bed-plate of the machine; B, thefeed-wheel;

G, the feed-dog, and D the brake-dog. Both these dogs catch in a circular groove, a, which is formed in thefeed-wheel B side by side with a cam-groove, b, the feed-wheel being placed into a cavity in the top of the bed-plate, and the grooves a and I) being made inthefeedwheel to allow the dogs to engage the circular groove a. The tail cof thefeed-dogO extends over the brake-dog D, while the tail (1 of the brake dog extends into a cavity, f, in the under surface of the bed-plate. From the bottom of this cavity rise two pins, gh, and to the pin it are hitched two springs, i j, one above the other, the spring 11 being attached to the feed-dog and the spring j to the brakedog. I have shown the spring ibroken off in order to more clearly illustrate the connection of the springj with thebrake-dog, but, of course, in practice the" spring i has one end attached to arrow marked on it in Fig. 1, but it prevents the same'from turning in the reverse direction. By placing the brake-dog beneath the feeddog I gain several advantages: First, I require a comparatively small opening in the bed-plate to permit both dogs to engage thecircular groove a iu the feed-wheel, and the strength of the bed-plate is not unnecessarily impaired second, the tooth of the feed-dog can be made almost of any desired length, so that the danger of breaking the rim of the feed-wheel is avoided.

The tail of the feed-dog is pressed up by its spring 6 against .the end of a slide-bar, E, which is guided by a cap, F, and by a screw, G, which passes through a slot, 70, in the slidebar E and screws into the bed-plate A, the cap F is secured to the bed-plate A by screws l l, which pass through slots m m in the cap, so that by releasing said screws the cap can be moved up or down, and thereby the slide-bar is caused to bear upon the feed-dog at different points and thelengthof the stitches is modified.

The slide-bar E receives its motion by the feed-lever H. This feed-lever has its fulcrum on a screw-stud, n, secured in the bed-plate A, and it is provided on its rear end with a rollerstud, 0, which engages with a cam-groove, p,

formed in-a disk, I, which is mounted on a vertical shaft, J. The front end of said feedlever forms a box, g, which contains two cams, r s, the cam 1" being retained in said box by a screw, t, on which it oscillates, and being adjusted in the required position by a setscrew, t, while the cam 8 slides in the box and is exposed to the action of a bell-crank lever; K, which has its fulcrum on a screw, 20, se-

cured in the upper surface of the feed-lever,

(see Fig. 2,) and the long arm of which has a curved edge,which bears againstaprojection, v, on the inner edge of the cams. arm of the bell-crank lever K connects by a rod, to, with an elbow-lever, L, that has its fulcrum on a screw, a, secured in the bedplate A, and on said elbow-lever is secured a roller-stud, b, which engages with the cam- The short jam-nut 0.

groove 1) of the feed-wheel and moves in a slot, 0, in the bed-plate, Fig. 1. The rod w passes through a hole in the end of the elbowlever L, and is provided with a nut, d, and

A spring, f, acts on the bellerank lever K, and has a tendency to throw this lever in such a position that the movable cam s is forced outward. By adjusting the nuts 17 e the bell-crank lever K is retained against the action of its spring, so that the movable cam s is not allowed to move outward beyond the desired point. As long as the roller-stud b of the elbow-lever L is situated in the inner portion of the cam-groove b of the feed-wheel, the movable cam s is thrown forward to the position shown in Fig. 1, and as the feed-lever H oscillates the said cam 8 acts upon the slide-bar E, and for each stroke of the feed-lever a uniform motion is imparted to the feed-dog and to the feed-wheel, so that stitches of uniform length are produced; but when the outer portion of the cam-groove b in the feed-wheel comes to act upon the rollerstud b of the elbow-lever this elbow-lever swings in the direction of the arrow marked on it in Fig. 1, the bell-crank leverKis forced down against its spring j" a certain distance, and the movable cam 8 falls back, so that the cam 1' acts upon the slide-bar E and the length of the stitches is increased.

It will be seen from this description that the slide E bears at one end againt the tail of the feed-dog and at its opposite end against the cams 1' s in the feed-lever, so that no connection is required at either end, and that by adv justing the cap F the length of the stitches can be varied. The long stitches can be separately adjusted by the set-screwt and cam 1".

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination,substantially as hereinbefore described, of the bed-plateA,feed-wheel B, situated in acavity in the upper surface of the bedfplate, the feed-dog G, and the brake dog D, the latter being situated beneath the feed-dog.

2. The combination, substantially as hereinbefore described, ot' the feed-dog O, the feedleverH, and the slide-bar E, bearing at one end against the tail of the feed-dog, and at its opposite end against the end of the feed-lever.

3. The combination, substantially as hereinbefore described, of the feed-dog O, the feedlever H, the slide-bar E, hearing at one end against the tail of the feed dog, and at its opposite end against the end of the feed-lever, and the cap F, which guides the slide-bar and is adjustable for varying the length of the stitches.

4. The combination, substantially as hereinhefore described, ot' the feed-lever H, the sliding cam s, the adjustable cam r, the bar E, and the feed dog G, and the feed-wheel B.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

JOHN S. FREESE.

Witnesses:

J. VAN SANTVOORD, W. C. HAUFF.