Sewing – Elements – Frames
Patent
1986-04-10
1987-04-21
Schroeder, Werner H.
Sewing
Elements
Frames
112253, 112255, D05B 4704, D05B 4900
Patent
active
046587527
ABSTRACT:
A method for drawing the free end of the needle thread from the upper workpiece surface to the lower workpiece surface when sewing the first stitch of a seam to be produced by a sewing machine having a reciprocable needle, which carries the needle thread drawn from a spool by means of a thread lever, at least one presser foot lowerable upon and liftable from the workpiece, and a rotatingly drivable hook, the point of which seizes and withdraws the needle thread for the stitch formation. In order to safely and automatically prevent the thread end of the needle thread from being clamped between the presser foot and the workpiece, the needle thread is held between the needle and the thread take-up lever while the needle thread loop is withdrawn by the hook beak, so that the thread end is drawn through the workpiece by the hook beak.
REFERENCES:
patent: 2885985 (1959-05-01), Kells
patent: 2988031 (1961-06-01), Reid
patent: 3312185 (1967-04-01), Chezaud et al.
patent: 3996866 (1976-12-01), Bianchi
patent: 4215641 (1980-08-01), Dobrjanskyj et al.
patent: 4364319 (1982-12-01), Niehaus et al.
patent: 4508043 (1985-04-01), Vollmar
Keilmann Werner
Raupach Gunter
Scholl Hans
Falik Andrew M.
Kochs Adler AG
Schroeder Werner H.
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