Thread manipulations at the beginning and end of a seam

Details Thread manipulations at the beginning and end of a seam Thread manipulations at the beginning and end of a seam

1992-10-02

1994-09-13

Crowder, Clifford D.

Sewing

Elements

Tensioning

1122621, 112291, D05B 4704, D05B 6502

Patent

active

053458877

ABSTRACT:
A thread-pulling device is fastened on the arm of a sewing machine. The thread-pulling device has a thread clamp that can be opened and closed on the thread, and can be moved toward and away from the sewing machine arm. In operation, the needle thread, which has been pulled off the spool and extends to the sewing needle, is conducted through the thread clamp. After an initial seam has been completed, the thread clamp is closed on the thread and moved to an extended position which is remote from the arm. In this way, a given length of the needle thread is pulled off the spool, thus providing the proper length of needle thread for dependable formation of the first stitch of the following seam. Then, shortly after the start of the following sewing process, the thread clamp is moved back over an intermediate distance toward the sewing machine arm so as to pull back the initial piece of the needle thread that is now hanging down from the back of the material at the start of the seam. The initial piece of needle thread is pulled back to such an extent that only a short piece of the needle thread, of predetermined length, will remain on the back of the material.

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