ADF yarn carrier with bypass equipment

I. Yarn carrier with bypass:

Bypass: The yarn won't be threaded in the yarn tube but it will rather be led over two eyelets.

When will the bypass be used?

	Explanation
with a very coarse, voluminous yarn	The yarn is too thick, and cannot be threaded in the yarn tube.
with a yarn, which "sticks" in the yarn tube	After the carriage reversal, the yarn is to be fetched back (tensioned) by the tension arm of the yarn control unit so that no yarn loop is formed. The increased friction results in a yarn loop, which leads to a fault in the fabric (yarn loop, hole, drop stitch, yarn breakage).

Explanation

The yarn is too thick, and cannot be threaded in the yarn tube.

After the carriage reversal, the yarn is to be fetched back (tensioned) by the tension arm of the yarn control unit so that no yarn loop is formed.

The increased friction results in a yarn loop, which leads to a fault in the fabric (yarn loop, hole, drop stitch, yarn breakage).