Sewing – Stitch forming – Feeding work material
Patent
1983-12-02
1986-05-20
Schroeder, Werner H.
Sewing
Stitch forming
Feeding work material
112313, D05B 2706
Patent
active
045893640
ABSTRACT:
A top feed device for a sewing machine has an upper feed dog movable horizontally and vertically in synchronism with operation of a lower feed dog. The upper feed dog is vertically moved by a spring for depressing an upper feed arm to which the upper feed dog is attached, and a crank engages the upper feed arm and is vertically swingable, the crank being held in engagement with the upper feed arm at all times to prevent striking engagement therewith. A swingable shaft to which the crank is fixed and a lever angularly movably mounted on the swingable shaft and swingable in coaction with a drive shaft have abutments projecting axially in confronting relation. The abutments on the shaft are urged by a spring to angularly move in one direction. The abutments on the lever which are held against the other abutments are disengaged therefrom in a circumferential direction when the upper feed dog reaches a throat plate and stops its downward movement. Then, the abutments on the lever are reversed and brought into engagement with the abutments on the shaft. A substantial portion of the swingable shaft and the lever are accommodated in a closed sewing machine body.
REFERENCES:
patent: 3530809 (1970-09-01), Porter
patent: 3636899 (1972-01-01), Crisler
patent: 3995571 (1976-12-01), Porter
patent: 4166422 (1979-09-01), Porter
patent: 4285294 (1981-08-01), Aida
patent: 4295434 (1981-10-01), Hsiao
patent: 4417536 (1983-11-01), Shiomi
patent: 4421047 (1983-12-01), Alberti
Kasuda Takashi
Yamamoto Khoichi
Falik Andrew M.
Pegasus Sewing Machine Mfg. Co. Ltd.
Schroeder Werner H.
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