Yarn winding apparatus

A yarn winding apparatus comprising:

• (a) a winding device for winding a yarn to form a yarn package on a bobbin, which includes a pair of winding spindles for mounting a bobbin and capable of being alternately positioned in a winding position of the winding device, a traverse element for imparting a traverse motion to the yarn, and a driving shaft for driving the traverse element;
• (b) a pair of first motors, each driving a corresponding winding spindle which is in the winding position;
• (c) a second motor for driving the traverse element driving shaft;
• (d) a pair of spindle speed detecting means, each detecting the speed of rotation of a corresponding winding spindle which is in the winding position, and for generating a first electrical signal corresponding to the detected rotational speed thereof;
• (e) means for detecting the speed of rotation of the traverse element driving shaft and for generating a second electrical signal corresponding to the detected rotational speed thereof;
• and
• (f) a pair of means for controlling rotational speed of said motors,
• a first speed controlling means including means for controlling one of the pair of first motors which is positioned in the winding position so as to keep a yarn winding speed substantially constant from the beginning to the completion of the winding operation of the yarn package;
• and
• a second speed controlling means including means for controlling the second motor so as to substantially keep the ratio of the rotational speed of the winding spindle to the rotational speed of the traverse element driving shaft at a predetermined value or values from the beginning to the completion of the winding operation of the yarn package in response to the first electrical signal and the second electrical signal.