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Publication of TW330954BpublicationCriticalpatent/TW330954B/en
A bottom thread winding device comprising: a bobbin for winding the bottom thread; an opening portion formed for taking in to or drawing out from the bobbin; a lead-in hole for guiding in the bottom thread supplied by the bottom thread supply source, which is wound on the bobbin; a lead-out portion; a bobbin case; a winding member; a thread guide member; a bottom thread winding device; which is characterized in comprising: a rotating member for rotating the bobbin in a direction for removing the slackness of bottom thread generated between the bobbin and the bottom thread supply source after the bottom thread has been guided to the slit by the thread guide member.