US1620249A - Sewing-machine attachement - Google Patents

Description

Patented Mar. 8, 1927.

UNITED `STATES PATENT ePrice.

kHERBERT CORRALL, OF I-IELENSBURGII, AND JAMES HEGGIE, OF CLYDE'BANK, SCOT- LAND, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, F ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE ATTACHMENT.

Application led February 23, 1924, Serial No. 694,493, and in Great Britain March 5, 1923.

This invention is concerned with a sewing machine attachment including a so-called darning toot, which is adapted to be fitted to the presser bar of the sewing machine, in lieu of the usual presser toot, and which will be lifted from the work by the rising needle-bar ateach ascent of the needle so as to release the work for a. minimum period to allow the work to be moved.

The invention has for anl object to provide a simple and inexpensive construction of extreme lightness, which, while permitting adequate elevation of the foot proper near the end of the upstroke of the needle, ofiers a minimum resistance, ensures prompt return ot' the 'foot proper to work-engaging position, and has none of the objections associated with the use of sliding parts.

In practice, the principal parts of the attachment are formed as stampings and include a clip applicable to the presser bar, a system of links pivoted to the clip, a footsupporting member jointed to and sustained by the links, and a stop connected to the system of links and engageable in one direction of movement of the needle bar by a cof-operating member participating in the rcciprocations ot the needle bar; the links, foot-supporting member and clip constituting a pinjointed structure deformation of which is resisted by a diagonally disposed spring or springs tending to hold the foot in lowered position.

In the accompanying drawings Fig. 1 is an end view of the head of the bracket arm of a sewing machine embodying the invention, the tace plate being removed, the parts of the attachment being shown in the positions occupied when the foot is lowered.

Fig. 2 shows the attachment viewed at right angles to Fig. 1. 3 is a fragmentary view, similar to Fig. 1, showing the 'toot raised.

In the drawings 1 denotes the rotary up- V per or needle-actuating shaft having the needle bar is a presser bar 8 normally depressed by a spring 9 and adapted to be raised by operation of the usual lifting lever 10.

rThe attachment proper comprises the clip 11 adapted to be adjustably secured to the presser bar 8 as by means of the pinching screw 12, a pair of parallel links 13, 14 of equal length formed as yokes embracing the clip 11, and connected by pivots l and 16 to the clip 11, a shank 17 connected by pivot pins 18, 19 to the links 13, 14, a pair of diagonally disposed helical tension springs 20, 21, one on each side of the clip 11, anchored to the pins 16 and 18, and a stop 22 detachably secured by screws 23 to a lug 24 integral with the upper link 13 and positioned in the path ot the needle clamp screw 5 or other member on the needle bar 4.

At its lower end the shank 17 carries the darning foot proper in the form of a loop 25 of bent wireadjustably secured to the shank 17 by a clamping screw 26.

27 denotes the throat plate on which rests the work being stitched, said throat plate being formed with the usual needle aperture and feed slots.

The feeding mechanism is or may be of the usual. type and is not described herein as it forms no part of the invention.

1. In a sewing machine, in combination with a uvertically reciprocatory needle-bar and a presser-bar, a jointed structure including a part detachably carried by the presser-bar, a foot-supporting member, and spaced links connecting said part and said member', said links being at all times disposed transversely of -the presser-bar, spring means tending to depress said member, and means for lifting said member in opposition to said spring means at each ascent of the needle-bar.

2. In a sewing machine, in combination with avertically reciprocatory needle-bar, a presser-bar adjacent to the needle-bar, a clip detachably carried by the presser-bar, upper and lower parallel links each pivoted at one end to said clip and disposed at all times transversely of the presser-bar, a footsupporting shank pivoted to the opposite ends of said links, spring means tending to depress said shank, and means carried by the needle-bar for lifting said shank in opposition to said spring means at each ascent of the needle-bar.

3. A sewing` machine attachment comprising, in combination, a clip formed for engagement with a presser-bar, a pair of parallel links one ol which has a projecting portion, adapted to be engaged by laterally projecting means on the` needle-bar, a footsupporting shank, pairs of pivot pins connecting :said links to said clip and to said shank, and diagonally disposed spring means anchored to one of each pair of pins.

4;. A sewing machine attachment conlprising, in combination, a vclip formed for engagement with a presser-bar, parallel npper and lower. links of equal length, each formed as a yoke embracing;` and pivoted to said clip, one link having a projecting portion adapted to be engaged by laterally projectng means on the needle-bar, a foot-snpporting shank embraced by and pivoted to said links, said clip, links and shank constituting a pin-jointed structure, and a spring resisting deformation of said structure.

A dai-ning foot lfor sewing machines comprising, a support adapted to be detachably conne ted to the presser-bar of a sen ing; machine, a foot member, a pair of parallol links connect-ing said foot member to said support, said links entending'4 at all times transverse to the direction of length o the presser-bar, a springfor depressing said lio'otrelative to said support, and 1n ans adapted to be engaged by a part carried by the needle-bar of a. sewing machine 'for lifting' said ioot in opposition to said springeach ascent of the needle-bar.

In testimony whereof We have signed our naines to this specilication.

HERBERT CORRALTQ JAMES HEGGIE

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