Thread Guide B

The thread guide on arm B is another guiding ring located within the upper path of the thread, and it is usually positioned closer to the front of the JUKI DDL-5550 sewing machine arm, that is after the thread guide A and before the main tension disc set. While guide A provides initial guidance, guide B stabilizes the thread path and brings it closer to the tension point: the final straightness: ensures the thread is directed straight and evenly toward the tension disc set, which is a critical stage before applying tension. controlling the entry angle: helps maintain an optimal entry angle of the thread into the tension discs, ensuring the thread is properly caught between the discs to apply the required tension. preventing tangling: acts as an additional barrier to prevent the thread from slackening, tangling, or wrapping around other machine parts during fast operation. fully compatible with models: Juki: DDL-5550, DDL-8100e, DDL-8500, DDL-8700. Other brands: JAKI, SHUNFA, and other similar industrial sewing machines.