A study on a new drafting transmission system of rubbed roving frame

Rubbed roving frames are main textile machines, and the drafting transmission system is the key one which constitutes rubbed roving frame, whose studies have absorbed some people at home and abroad who are in this field. A new type of rubbed roving frame drafting transmission system is presented in this paper, which consists of the main drawing part and the fine-tuning parts of drawing tension. The main drawing part is mostly composed of a pair of pulley speed change mechanism which can meet the range requirements of drawing multiple. The fine-tuning parts of drawing tension consist of nine-link corrected gear and slipping gear. Tension adjustment range and the difference in the rate of transformation can be met through the gearing mesh of the same diameter and different modification coefficient. Drawing multiple design method of these two forms of coupling drawing is proposed, and nine-link corrected gear coefficient theory formulas and slipping gear design formulas are derived. Twin-wheel design method is given based on series portfolio theory. The problem that the same drawing system can meet different fiber drawing effects having differences is solved. As a result, a new design method of drafting transmission system of rubbed roving frame is established.