US 4,056,071 A · Combination presser bar lifters and pressure controls

Abstract

A presser device for a sewing machine having a rockable member pivotably carried by the sewing machine frame and connected to a presser bar to axially move the same up or down, a pivoted lever urged by a spring towards the rockable member, and, a drag link carrying a roller on one end, which roller extends between the pivoted lever and one of two surfaces above and below the pivot of the rockable member to urge the presser bar upwardly or downwardly, respectively. Presser bar pressure is varied by varying the spacing between the roller and the pivot of the rockable member. Two embodiments are disclosed, a first wherein the position of the roller is varied by means of a second pivoted lever connected to the drag link; and, a second wherein a pair of push buttons operate on a bell crank connected to the drag link, one of the push buttons incorporating a cam to control movement of the drag link.

Claims8

Dependent claims

A presser device for a sewing machine having a frame, said presser device comprising:

a presser bar supported by said frame for endwise movement;
rockable means operatively connected to said presser bar for transfering selectively variable and reversible force thereto;
means for creating a force for transfer to said presser bar;
and, means for adjustably connecting said force creating means to said rockable means in order to obtain said variable and reversible force on said presser bar.

1 more element

A presser device for a sewing machine having a frame;

said presser device comprising:
a presser bar supported by said frame for endwise movement toward and away from a work material;
a member having an axis pivoted on said sewing machine frame;
said member having a lug extending transversely of said pivot axis and operatively connected to said presser bar, said member being further formed with a pair of surfaces extending parallel to said pivot axis, said surfaces extending towards each other to form an obtuse angle opening toward said pivot axis;
means for creating a force;
means for connecting said force creating means to a selected surfaces of said surfaces a selectively variable distance from said pivot axis.

3 more elements

Dependencies are inferred from the claim text.

Combination presser bar lifters and pressure controls

Life of this patent

Combination presser bar lifters and pressure controls

Life of this patent

Abstract

Claims8