Abstract
It is commonly accepted that a spinning frame shaking and eccentricity of bottom roll are the major causes of yarn unevenness. Nevertheless, spinning frames in many mills are not entirely free from such faults even today. Improvements in yarn quality are, therefore, possible by a strict supervision on draft rolls.
This article sums up the author's view on this problem based on his experiences in the plants of the Toyo Spinning Co., Ltd.
Causes for unsmooth revolutions of a bottom roll lie in:
(1) The roll itself
(2) Roll alignment
(3) Gear train that drive the roll
(4) Bearings supporting the roll
(5) Mishandling in the maintenance work
