US1279088A - Presser-foot-lifting mechanism for sewing-machines. - Google Patents

Description

A. H. DE VOE. PRESSER FOOT LIF'HNG MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. 22, I916- Patented Sept. 17, 1918.

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LBERT 1 a as Jans n s slsae am ss w -streams A assess s-10a s wa trnEssER- wnum ye FOR EW NGrMAC lNES- Original application filed March 5, 1915,

To all whom it may concern:

Beit known that I, ALBERT n Von, a citizen of the United States, residing at WVestfield, in the county of Union and State of New Jersey, have invented certain 11 W and useful Improvements in Presser lifoot Lifting Mechanisms for Sewing-Mach nes, of which the following is-a specificatifln, reference being had therein to the acco panying drawings.

This invention relates to presser-foot mechanism for sewing machines, more particularly of the type in which the presserfoot is carried by a presser-bar journaled in the machine head, and has for an object to provide a presser-foot lifting mechanism which will not add to the inertia of the presser-foot and render it sluggish in action at high speed, as it rises and falls with the feed-dog, and yet which may be controlled by either a hand or a treadle-operated lever.

Another object of the invention is to provide a machine having a plurality of independently movable spring-pressed presserbars with a resser-foot lifting element and independently adjustable connections between said element and the presser-bars so that either of said bars may be lifted higher than the other, or so that they may be lifted to the same height.

Further objects of the invention will appear from the following description and appended claims.

In the accompanying drawings, Figure 1 is a side elevation of the presser-foot lifting mechanism showing the machine frame in end elevation. Fig. 2 is a fragmentary perspective view.

As represented in the drawings, the improvements are'shown applied to a sewing machine frame comprising the bed A and standard B supporting the head C. The feed-clog, shown at f, is supported and actuated by mechanism fully described in my United States Patent No. 1,250,437, granted December 18, 1917, on an application filed March 5, 191.5, of which this application is a division. Cooperating with the feed-dog f are two presser-feet 1 and 2 pivotally connected to shank members 3 and 4, respectively, which in turn are secured to the lower ends of the presser-bars 5, 6, journaled to slide in suitable bearing apertures formed in the head C in rear of the needle-bar 7.

reeificet eie fish r Retest Patented Sept. 17, 1918.-

Serial No- 12,274. Divided and this application filed November 22,

191.6. erial No. 132.830.

Yielding means, such as the usual leafnr ngs 8, 8, are provided for urgin the PlQfi-fifldmrs toward the teed dos f- The Presser-bar I5 is embraced by a sleeve 9 d spos d immediate y below the collar 10 adju ta bly secured in osition on the presserar 5 by a set screw-ll and having a lateral extension 12 which is forked to embrace the presser-bar 6 and thus prevent turning movements of the bar 5. The sleeve 9 is fitted to slide upon the Presser-bar 5 and at its lower end is formed with a short extension 13 which lies immediately below a block 14 adjust-ably secured to the presserbar 6 by the set-screw 15. V'Vhen the stops 10 and 14 are adjusted to the positions illustrated it will be seen that the sleeve 9 in its upward movement will lift the presserbars simultaneously. If, however, the position of either of the stops is shifted upwardly it is obvious that the sleeve 9 will engage and lift one of the stops and its corresponding bar before said sleeve engages the other stop. As a result, one of the presser-bars will be lifted higher than the other. v

Projecting laterally from the upper endportion of the sleeve 9 is a pin 16 adapted to freely enter an aperture at the forward end of the usual tre-adle-operated lever 17 In practice the lever 17 is connected by a chain or rod to a treadle to enable the operator to insert or remove work from the machine without the necessity of employing the hands to manipulate the hand-lever 18 which as usual is pivoted to the head 0 at 19 and is formed with the cam. surface 20 adapted to engage and lift the roller-stud 21 which is mounted at the lower end of the sleeve 9. The above described mechanism, exclusive of the stops 10 and 14, adds nothing to the inertia of the presser-bar and yet said bars may be lifted at will by means of the hand or the treadle-operated lever.

Having thus set forth the nature of the invention, what I claim herein is:-

1. Presser foot lifting mechanism for sewing machines comprising, in combination, a frame, a plurality of presser-bars mounted in said frame and each carrying a presser-foot, a plurality of stops each carried by its respective presser-bar, a sleeve slidingly mounted upon one of said bars and having portions underlying said stops, and means for lifting said s eeve.

2. Presser-foot lifting mechanism for sew-1 ing machines comprising, in combination, a

frame, a plurality of presser-bars mounted in said frame and each carrying a presserfoot, a plurality of stops each adjustably mounted upon its respective presser-bar, a

sleeve slidingly mounted upon one of said bars and having portions underlying said stops, and means for lifting said sleeve.

3. Presser-foot lifting mechanism for sewing machines comprising, in combination, a frame, a plurality of presser-bars mounted in said frame and each carrying a presserfoot, a liftin element, and separate, independently ad ustable lifting connections between the respective presser-bars and the lifting element, whereby either of said presser-feet may be lifted a greater distance than the other through the action of said lifting element.

4. Presser-foot Copies of this patent may be obtained for lifting mechanism for sewing machines comprising, in combination, a frame, a plurality of presser bars mounted in said frame and each carrying a presserfoot, a lifting element common to said bars, and independent hand and treadle-con- "trolled lifting devices movable relatively to five cents each, by addressing the Commissioner of Patents.

Washington, D. 0."

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