US286662A

US286662A - Wendell

Info

Publication number: US286662A
Authority: US
Publication date: 1883-10-16
Anticipated expiration: 1900-10-16

Description

(No Model.)

W. wNnLL.

SEWING MACHINE.

No. r186,662. Patented Oct. 16, 1883.

N. PETERS4 PhmLumgmpnnr. washington, Dlc.

Y' UNITED STATES PATENT FFIC.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 286,662, dated Octobe.i 16, 18S?.

i Application filed July 16,1883. (No model.)

-of which the following is aspecication, reference being had therein to the accompanying drawings.

The object of iny invention is to provide the presser-bar of a sewing-machine with simple and efficient means by which said presser-bar and its attached foot may be raised when required; als'o means whereby the presser bar and foot may be raised to differents heights by moving thehandle of the lifting-lever in different directions, and to provide a lifting-lever of such construction that, although it is pivotedon the presser-bar, the latter may have a limited vert-ical movement without affecting the former.

In the accompanying drawings, Figure l is an inside view ofthe cap or face plate of a sewing-machine having my invention applied thereto, the presser-bar and presser-foot being represented in their lowest position. Fig. 2 is a view similar to Fig. l, representing the presser-bar and presser-foot in their highest bar.

position in full lilies and in a lower raised position in dotted lines, the positions of the lifting-lever being indicated by full and dotted lines to correspond `to the different elevated positions of the presser-bar and presser-foot.

A indicates the cap or face plate ofa sewing-machine; B, the needle-bar, carrying the usual eye-pointed needle, b, and C the presser- A presser-foot, I), of any suitable construction, is secured to the lower end of the presser-bar by a set-screw, G, or in any other proper manner, the presser-foot being yield ingly held upon the work by a spiral spring, E, the stress of whichis regulated by a thumbnut, F, all as usual.

My'improved lifting-lever H is connected with the presser-bar by a pin, I, secured to said presser-bar and entering an inclosed slot, J, in the said lever, said slot, when the liftinglever is in the position indicated by Fig. l, permitting the presser-bar and its attached pin I to move vertically to a limited extent without disturbing the lever, the latter being provided with a eounterbalancing part, K, to

keep it at rest. As is well known, the feed,

working in. opposition tothe presser-foot, causes the latter and the presser-bar to rise slightly at each stitch as the feed rises, prior to moving forward to advance the goods, and this upward movement of the presser-bar causes the litters of -ordinary construction, when pivoted to the presser-bars', to vibrate. This constant vibrating movement of the lifters, which is Vdeemed to be objectionable, is obviatedA by the construction just above described. away to form a recess, L, through which the handle of the lifting-lever projects, the walls or ends of said recess serving as stops to limitthe movements of the said handle. The faccplate is also provided with a block or fixed portion, M, which may be formed integral with said face-plate, as shown, or :may be a separate piece securedA to said face-plate by screws or otherwise. This block or fixed portion M is preferably Yformed with two inclined surfaces, fm. and m', preferably of different dimensions, converging to a point, m2, which mayr The side of the face-.plate A is cut' be slightly rounded. These inclined surfaces Y may be either straight, as shown, or they may be formed convexl or curved. l The lifting-lever is provided on opposite sides ofV its point of connection with the presser-bar, and at unequal distances therefron1,'with lugs or projections h and h, which are adapted to bear against the inclined surfaces m and m', respectively. The projections h and h serve as ful- Vcra for the lifting-lever in raising the presserbar, the weight to be raised being sustained by the projection 7L or the projection h', accordingly as the handle of the lifting-lever is elevated or depressed. Thus, if the handle ofthe Vlifting-lever be depressed, the weight ofthe presser-bar will be thrown onthelug 11,', bearing on the inclined surface m', and a continued depression of said handle will cause said lug to travel up said inclined surface until the handle strikes the lower wall of the recess L and the lug h has reached the point m2, when the presser-foot will be raised to the position shown by dotted lines in Fig. 2. In thus operating, the lifting-leverwill act as a lever of the first order, the fulcruni being between the power and the weight. Ii', however, the handle of the lifting-lever be raised, the weight of the presser-bar will be thrown on the lug 71,

IOC

and said lug will be caused to travel up the inclined surface m to the point m2, as indicated in full lines, Fig. 2, raising the presser-foot to 'its highest position, the lifting-lever being the presser-bar, and at unequal distancesV therefrom, and by providing suitable fixed bearing-surfaces on which said fulcra can travel when the liftinglever is elevated ordepressed,the presser bar and foot may be raised to different heights by moving the handle of ,the lever in one direction or. the other, thus ,obviating the necessity of too great a sweep of the handle in securing a variabledouble lift of the presser-foot. f

If it is not deemed desirable to use the construction whieh admits of the double lift of the presser-bar, a lifting-lever having but one ,fnlcrumand a fixed bearing-surface having but a single incline may be employed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. rlhe combination, with the presser-bar` of a sewing-machine, of a lifting-lever pivot.-

ed to said bar, and provided with a fulcrum on each side of its point of attachment to said bar, and afixed block having inclined bearing-surfaces for the fulcra of said lever, substantially as set forth.

2. The combination, with the presser-bar of a sewing-machine, of a lifting-lever pivoted to said bar, and provided with two fulcra,

one on each side of its point of attachment to l said bar, and at unequal distances therefrom, and a xed block having/inclined bearing-sun faces for said fulcra, substantially as set forth.

3. -The combination, with the pressenbar of a sewing-machine, of a lifting-lever pivot.- ed to said bar, and provided with two fulcra, one on each side of the point of attachment to ,said bar, 'and at unequaldistances therefrom, and a fixed block having two inclined bearingsurfaces of different dimensions, substantially as set forth.

4. The combination, with the presser-bar of a sewing-machine, of a lifting-lever pivoted to said bar, and provided with two fulcra, one on each side of its pivot-al point, a fixed block havinginclined bearing-'surfaces for the said fulcra, and stops ormeans for limiting the movement of said lever when the same is turned in either direction, substantially as set forth.

'5. The combination, with a presser-barhav ing a lifting-pin secured thereto, of a liftinglever having a slot in which said pin is arranged, saidlever also having two fulcra, one on each side of said slot, and a counterbalaneed portion to hold it at rest during slight