US108033A - Improvement in sewing-machines - Google Patents

Description

ALBERT KOMP, 0F new vom, n. Y.

.IMPROVENI ENT IN SEWING-MACHINES.

Specication forming part of Letters Patent lo. 108,033, dated October 4, 1870.

To all whom it may concern:

Be it known that I, ALBERT KOM-P, of the city, county, and State of New York, have in,-

i vented a new and useful Improvement in Sew` ing-Machinesgand I do hereby declare the following to `be a full, clear, and exact description thereof, which will enable those skilledin the art to make and use the same, referencebein g had tothe accompanying draw-- ings, forming part of this specification, in which drawings- Figure l represents a front view of this iuvention, partly insecticn'. Fig. 2 is a sectional View of the feedmechanism. Fig'. 3 is a side View ofthe machine. Fig. 4 is ahorizontal section of the saine.

Similar letters indicate corresponding parts.

This inventionrelates partly to the feed mechanism of a sewing-machine, which is eI- fected by the action ofthe presser-foot to which the requisite motion is imparted by the combined action of a-cam on the main. shaft and of another cam on the needle-slide. The invention also relates to a braid-guidewhich is securedto a lever hinged, as hereinafter described, to the cloth-plate of the sewingfrnachine, and which is held down upon the throatplate of the sewing-machine by the yielding pressure of the presser-foot, so that it can be readily raised for the introduction ot the braid, and that the same, while thev operation i of sewing progresses, is free to accommodate itself to any inequality in the thickness of the v braid. Y

In the drawings,the letter A designates the cloth-plate of a sewing-machine, from the back part of which rises the arm B, (see Fig. 3,) which forms the bearings for the main shaft C, and to the front end of which are attached theneedle-slide D and the.presser-foot F. This presser-foot is subjected to the action cfa spring, E, and it is fitted in its guides so that it canreadily rise and fall, and also swing in the direction in which the feed is to take place.`

From the shank of the presser-foot extends an arm, a, over a-cam, b, mounted on the main shaft, and as this cam revolves the presserfoot is alternately lifted up against the action of its spring, and then allowed to sink down,

. pressure,

so as to clamp the material to be sewed down upon the cloth-plate.

From the edge of the presser-foot bar projectsa nose, c, against which `acts a cam, d,`

attached to the edge of the needle-slide, (see Fig. 2,) and the spring -E is so adjusted that it has a tendency to hold the presser-foot down The reciproand in toward the needle-slide. eating motion of the needle-slide and the rising and falling motion of the presser-foot are so timed in relation to each other that the presser-foot `is down when the needle enters, and when the needle has been withdrawnfrom the cloth the cam d of the needle-slide acts on the nose c, and the feed-motion takes place. Then the presser-foot rises, together with the needle-slide, and remains stationary for a short time, until the needle-slide has descended fanA enoughv to carrythe arm d clear ofthe nose c, when the presser-foot falls in toward the needle-slide and is immediately depressed, so

as to retain the cloth in position while the needle penetrates through the same. A setscrew, e, serves to regulate the length of the stitch.

To the side ofthe cloth-plate is pivoted a lever, Gr, which carries the braid-guide f.' This braid-guide consists of an angular piece of `sheet metal, as shown in the drawings, and it is secured to the lever G by set-screws, so that it can be readily taken off and changed for another. The working part of the braid-guide lies dat upon the throat-plate g, which is provided with an offset equal in depth to the thickness of the braid-guide, so that when said braid-guide is down its upper surface is "level with the highest portion of the throatplate. In the under surface of the braid `guide is a groove, t', to receive the braid, and byraising the braid-guide up the braid can be readily introduced under it. After the braid has' been adjusted under the braid-guide the latter is depressed, and it is held down during the action of the needle by the end of the presser foot, which extends somewhat be- Tond.its edge, as .shown in Figfl, and the braid-guide is thusr held down by a yielding so that it can readily adjust itself to any inequalityexistingin the thickness of the braid. v

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

- presser-foot F, all constructed and arranged 1. The arrangement of the cam b on the substantially as set forth.

shaft; C, arm a, presser-foot F, nose c, cam d A. KOMP. on the needle-slide, and spring E, all as shown Witnesses: and described. W. HAUFF,

2. The braid-guide f and the hinged lever G. WAHLERS.,

G, in combination with the throabplate g and

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