1.1  Twist principle

Spinlde spin one ring ,yarn twisted two times, The fisrt twist is between yarn tensioner device and exit of yarn twist plate .like this, if the spindle spin 5000 rings ,and the yarn will emerge 10000 twists

1.2  Yarn traverse

Feeder bobbin be put in settled filling yarn pot, released by the releasing device or by itself, then enter into the centre bore of rotation hollow spindle via the tension device. Pass 90°corner ,go into the twist plate ,from twist plate exit to store yarn plate ,spin to get to yarn-guiding ring ,formed a air ring, the height of the air ring according the position of the yarn-guiding ring.

After the yarn go through the yarn-guiding ring and roller,get to over-feed roll,to pass the move yarn device,at last cross take-up on the bobbin which drived by the friction bowl.

1.3  Machine basic structure

Machine compose of three faction parts

·Motive power parts

Contain motor ,spindle speed exchange belt pulley, electric control box ,operating element, displayer.

·Two-for-One Twisting parts

The machine two sides working structure is symmetrical ,use mental plate structure ,each section is compose of several Two-for-One Twisting structure units .

·Driving part

Machine power passed to spindles and driving box via apron belt. ,driving box drive winding system,  over-feed roll,  and lifting device, etc

3.5  Structure of Two-for-One Twist unit

3.5-1 spindle brake apparatus

It stops the spindle to rotate by using the combination of separate spindle and brake slice. When braking ,separate the spindle from the joint of apron belt by hand, make the spindle away from apron belt, prolong the lifetime of the belt and spindle plate  ,meanwhile reduce the power consumption.