Sewing – Stitch forming – Feeding work material
Patent
1985-02-12
1986-04-08
Schroeder, Werner H.
Sewing
Stitch forming
Feeding work material
112320, D05B 2706
Patent
active
045805164
ABSTRACT:
An alternating presser foot with a vertically movable sole portion, fixed in the feeding direction of a feed dog, and a clamping pressure foot adapted to be placed on sewing material relative to the movable sole portion by means of a drive lever which cooperates with a needle bar for movement along with the sewing material in the feeding direction of the feed dog. For transmission of motion from the drive lever to said clamping pressure foot, an angle lever is provided, one arm of which, extends approximately vertically, defining a guide cam cooperating with a follower of the drive lever, while the other arm thereof extends approximately horizontally defining a pressure element for stressing said clamping pressure foot in order to place it in engagement with the sewing material. The clamping pressure foot entrained, in turn, is operatively connected to the lower end of a cam member which is suspended in a pendulating manner, said cam member having a cutout portion that narrows in the downwardly direction approximating a V-shape configuration. The lower, narrowed end portion of said cutout portion cooperates with a centering element of the drive lever for determining the neutral starting position of said clamping pressure foot, whereas the upper, widened cutout portion makes possible a pendulating motion of the cam member providing for the engagement of the clamping pressure foot with the sewing material being moved by the feed dog.
REFERENCES:
patent: 1260772 (1918-03-01), Hemleb
patent: 3099974 (1963-08-01), Chudner
Falik Andrew M.
Fritz Gegauf Aktiengesellschaft Bernina-Nahmaschinenfabrik
Schroeder Werner H.
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