Singer 1 One Instruction Manual 27 - Page 127
Two-Thread Overedge finish. The Four-Thread Safety Stitch is appropriately used
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Four-Thread Safety Stitch This stitch is an alternative to the Five-Thread Safety Stitch. It offers the same type of Two-Thread Chainstitch. However the Three-Thread Overlock is now replaced by a Two-Thread Overedge finish. The Four-Thread Safety Stitch is appropriately used when sewing a medium weight woven fabric. Because there is one less thread being used, the stitch is less bulky. However, it is still strong enough not to require straight stitch reinforcement from a conventional sewing machine. This stitch requires two needle threads and two looper threads. Four-Thread Safety Stitch page 1
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Four-Thread Safety Stitch
This stitch is an alternative to the Five-Thread Safety Stitch.
It offers the same type of
Two-Thread Chainstitch.
However the Three-Thread Overlock is now replaced by a
Two-Thread Overedge finish. The Four-Thread Safety Stitch is appropriately used
when sewing a medium weight woven fabric.
Because there is one less thread being
used, the stitch is less bulky.
However, it is still strong enough not to require straight
stitch reinforcement from a conventional sewing machine.
This stitch requires two
needle threads and two looper threads.
Four-Thread Safety Stitch page 1