Thread-take-up controller and method

Details Thread-take-up controller and method Thread-take-up controller and method

1995-11-24

1997-10-28

Nerbun, Peter

Sewing

Special machines

Embroidering

112243, 11247519, D05B 1900, D05C 1100

Patent

active

056808259

ABSTRACT:
A device and method for continuously regulating the amount of thread stripped from a supply spool and fed to a sewing needle during embroidery is provided. In commercial embroidering, the lengths of consecutive stitches can vary widely. The invention allows the machine to apply optimal tension to all embroidery stitches, regardless of their differing lengths. Pulling all stitches under optimal tension improves the appearance of the finished stitches and reduces the breakage and fraying of the thread. In the preferred embodiment of the invention, a digital computer controls a programmable servomotor, which in turn regulates the action of the embroidery machine's take-up and driver lever. The take-up in turn regulates the length of thread stripped from the supply bobbin and fed to the current stitch. In an alternative embodiment, the take-up and driver lever are replaced by a wheel, which is connected to the servomotor.

REFERENCES:
patent: 4408554 (1983-10-01), Takiguchi et al.
patent: 4967679 (1990-11-01), Hara et al.
patent: 5327840 (1994-07-01), Tajima et al.

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