Importance

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Abstract

A yarn tension control apparatus comprises a first feed roll having a substantially conically tapered yarn engaging roll surface, and including means for driving the first feed roll at a predetermined r.p.m. and a second feed roll having a substantially conically tapered yarn engaging roll surface, the second feed roll positioned in spaced-apart relation with the first feed roll for receiving a yarn wrapped successively around a circumference defined collectively by nonadjacent hemicylindrical roll surfaces of the first and second rolls, and including means for driving the second feed roll at the same predetermined r.p.m. as the first feed roll. The first and second feed rolls are aligned relative to each other so that the collectively defined circumference at any point on the yarn feeding surfaces of the first and second rolls is greater than the collectively defined circumference in one direction along the axis of rotation of the rolls, and less than the collectively defined circumference in the other direction along the axis of rotation of the rolls. As the wraps of yarn proceed along the axis of rotation of the first and second roll surfaces, the decreasing circumference of the first and second rolls reduces the rate of feed of the yarn relative to the yarn upstream therefrom and thereby reduces the tension on the yarn as it is fed off of the rolls and downstream therefrom.

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First Claim