Fig. 66
1 - The thread take-up spring (check spring) of the upper
tension.
This check spring " E " (Fig. 66) serves two purposes, namely:
To take up and hold the slack of the upper thread, given free by
the descending thread take-up lever (No. D 20033), until the eye
of the descending needle has entered the fabric.
To release gently the thread which, during the finishing phase of
the stitch, was required for the stitch formation, and to permit the
thread take-up lever to close the stitch without tearing the fabric.
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