Method for monitoring waxing of a moving yarn

摘要

In order to improve the traveling and sliding properties of a yarn during its further processing, in particular for knitting, it is waxed during rewinding in cheese winding machines by passing it along a paraffin body. When the paraffin body is used up, the unwaxed yarn can cause yarn breaks or even needle breakages, which leads to production errors or lost production. At the winding stations, the drive of the friction drum is switched on and off at intervals to cause alternating acceleration phases with slippage between the friction drum and the bobbin and intervening slippage- free run-out phases to prevent pattern windings. The slippage is monitored over the course of the winding operation. If the slippage decreases in successive acceleration phases and remains at a low level, while the drive output of the friction drum remains unchanged, this is interpreted to indicate an outage of the paraffin application.