Thread winding device with thread changing guide - has thread reserve mechanism operated according to position of guide, detected by sensor in thread guide path

摘要

The time length of the thread reserve formation is measured so that its end coincides with meeting the changing thread guide (14) at the end of the spool (20) set next to the thread reserve. A sensor is provided in the pain of movement of the changing thread guide (14) responding to the position thereof. The sensor is pref. contact less and can be a light barrier formed from a light diode and photocell, or an echo probe. The changing thread guide can be an element set by a return roller (16) into a substantially linear reciprocal movement. ADVANTAGE - The time at which a thread is detected from changing to the beginning of the winding path can be accurately predetermined.