US1404704A - Presser foot for sewing machines - Google Patents

Description

A. H. DE v05. PRESSER FOOT FOR SEWING MACHINES.

APPLICATION FILED MAY 3', I919.

Patented Jan. 24, 1922.

' INVEN T 0B MM A TTORNEY number of needles ALBERT H. DE 370E, 0F WESTFIELID, NEW JERSEY, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A GORlPOfiATION OF NEW 3' PRESSER FOOT FOR SETVING MACHINES.

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I Specification of Letters Patent. Patented Jan, 24l, 1922.

Application filed May 3, 1919. Serial No. 294,391.

To all whom it may concern:

Be it known that I, ALBERT H. DE Von, a citizen of the United States, residin at l festficld, in the county of Union and tate of New Jersey, have'invented certain new and useful Improvements in Presser Feet for Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to prcsser-feet for sewing machines and aims to improve details of construction thereof especially for the type of foot employed in stitchmg at widely spaced intervals heavy material, such as stiff canvas, wherein it is desirable to hold the work with the same pressure'immediately adjacent each of the spaced needles in order that the feed-dogs mayadvance the material at the same rate past each needle.

The construction briefly described comprises a pair of sole portions universally connected to a tilting lever which is fulcrumed to the lower end of a presser-bar and has the sole portions held by links in breastwise relation while the outside heels of the. sole portions are yieldingly urged downward upon the work.

The invention is illustrated in the accompanying drawings in which Fig. 1 represents the presser-foot partially sectioned in front elevation. Fig. 2 represents a top plan view thereof and Fig. 3 represents a sectional end elevation.

The prcsser-foot is illustrated as it has been embodied in metal applied to a twoneedle chain-stitch machine'but obviously it is capable of use with a wide variety of stitch-forming mechanism and with any In the'drawings at the lower end of the presser-bar 1 a cross-bar 2 is secured by a fasteningscrew 3. The cross-bar 2 is provided with substantially vertical and horizontal flat surfaces 4.- and 5, respectively, which as shown in Fig, 3 are disposed in planes parallel and'at right angles respectively to the axis of the presser-bar. A tilting lever Sis fulcrumed on the conical headed bolt 7, which is locked by the nut 8, the rear face of this lever 6 being guided by the flat surface 1 of the cross-member 2. The tiltinglever 6 is provided with axially alined sockets receiving pins 9 adjustment bearing lugs 15 adjustably sustaining pins 16 around which are coiled springs 17 whose opposite ends are anchored to the pins 16 and to the relatively fixed split spherical sockets 11, respectively, and normally urge the heel of the sole portions downwardly. Lugs 17 on each sole portion beneath the split sockets l1, limit the action of springs 17 and a slot 16' in the end ofeach rod 16 permits ready tensioning of the springs.

In order to holdthe sole portions 13 abreast of. each other and against turning about their ball-and-socket connections with the tilting lever 6, ball-studs18, which are supported rearwardly of the presser-bar on rods 19 adjustably secured in the cross-bar 2 by screws 20, are connected by links 21 presser-bar and parallel with the line of feed. Because of the universal connections at'the opposite ends of each of the links 21, the sole portions are each free to tilt in any direction about their ball-and-socket connections 11-12 but are held against rotation in a plane parallel withth'e plane in which the work advances, as will be apparent from a scrutiny of the drawings;

Disposed on opposite sides ofa central transverse' plane through. the presser-foot and through the axis of the presser-bar are a pair of'coiled thrust springs 23 whose I lower ends bearagainst the tilting lever 6 with a pressure which may be varied by adjustment ofthe set-screws 24 which constitute an adjustable abutment for their upper ends. These springs 23 normally urge each of the sole portions down upon the work with the same pressure and tend to hold their lower faces in the same plane.

The ball-and-socket connections 11-12be arrangements oi L118 prior art. connection 7 between the tilting lever and tween the sole portions and the tilting lever afford extensive bearing surface and enable the sole portions to move or tilt very freely, much more so than in the transverse pin f The tapered the cross-bar permits wear to be taken up in a simple manner. The coiled springs 17 which normally urge the outside heels of the sole portions yieldingly downward facilitate the introduction of work under the presser and insure a uniform advance of the work at the widely separated needleholes where the drag of the outlying margins of the body thereof imposes the greatest load on the feeding mechanism. Genera pair of 'soleportions, universalconnections between said sole portions and said tilting lever at opposite sides of the latters pivot, and links for holding saidsole portions in relative operating positions.

' 2. The combination as specified in claim 1 in which the universal connections between the sole portions and the tilting lever are laterally adjustable.

8. A .presser mechanism for sewing machines comprising a presser-bar, a member fixed to the lower end of said bar and having a ,pair of angularly disposed flat faces in planes parallel and perpendicular respec tively to the axis of the presser-bar, a tilting lever fulcrumed on a conical pivot supportedby said member for movement in parallelism with one of said flat surfaces on the member, a pair of sole portions, ballan d-socket connections between said sole -portions and said tilting lever at opposite sides of said conical pivot, one ofsaid flat surfaces on said member overhanging said tilting lever and affording stops for limiting its movement, and means for holding saidsole portions abreast of'each'other.

4:. A 'PIGSSQIJHBCl IELTHSIH for sewing machines comprising a -presser-bar, a member .fixed thereto, a pair of sole portions, a lever -fulc'rumed intermediate its ends to said member and at its opposite ends having universal connections with said sole por- -tions,-;spring-means inter-posed between each of saidsoleportionsandsaid tilting lever normally urging the heel of the sole portions downward, and means for holding said sole portions against rotation in a plane perpendicular to the axis of thepressurebar and about the universal connections be tween the sole portions and the tiltinglever.

5. In a presser mechanism for sewing machines, a support, a pair of relatively shiftable sole portions having universal connections with said support, and springs arranged to yielding urge the outside heels of thesole portions downward;

6. In a presser mechanism for sewing machines, a presser-bar, a tilting lever fulcrumed thereon, a pair of solo portions having universal connections with the op- 'positeends of the tilting lever, and coiled springs urging'the outside heels of the sole portions yielding downward upon the work.

7. In a presser mechanism for sewing machines, a presser-bar, a tilting lever fulcrumed thereon, a pair of sole portions havinguniversal connections with the op posite ends of the tilting lever, coiled springs urging the outside heels of the sole portions yieldingly downward upon the work, and means for varying the forceor tension of the coiled springs.

8. In a presser mechanism for sewing machines, a presser-bar, a tilting lever fulcruined thereon, a pair-of sole portions having universal connections with opposite ends of the tilting lever, coiled springs adapted to bear on the work and having a ball-and-socket connection with said supporting means whereby it may tilt in different directions, and means for preventing the sole portionturning inthe' plane of the work.

10. In a presser mechanism for sewing machines, a support,a sole piece having universal connection with said support, whereby said sole piece may tilt in different directions relative to said support, said sole piece being of greater width than length, and means independent of said universal connection for restraining said sole piece urging the outside heels of-the sole portions against turning in a plane parallel to the plane of the work.

1.1. In a presser mechanism "for sewing machines, a presser-bar, a tilting lever pivotally connected with said presser-bar,

a pair of sole pieces of greater width than length each having universal connection' with said tilting lever, and meansindependent of said universal connections for restraining said sole pieces against turning in planes parallel to'theplane ofthe-work.

12. In a presser mechanism for sewing machines, a support, "a plurality of solepieces each having ball-and-socket connec tion with said support, and means for preventing said sole-pieces turning in the plane of the Work.

13. In a presser mechanism for sewing machines, a presser-foot support, a resserfoot, a baH-and-socket connection between said resser-foot and its support permitting universal tilting movements of the presserfoot, and an anchor link connected to said 10 presser-foot for holding the letter against turning movement in the plane of the work.

In testimony whereof, I have signed my name to this specification.

ALBERT H. DE VOE.

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