Application:

SDDA2553PL×4 is designed for the drafting system with 4 rollers and double aprons, and is applicable to cotton spinning roving frame with 4 rollers. It can process cotton, man-made fiber and other synthetic fibers up to 65 mm.
Features:
Gasbag-lever weighting is used in this kind of pendulum arm. The arm can process many types of fiber. Through adjusting the pressure of gasbag, infinitely variable pressure regulation can be done upon all the top rollers on the entire pendulum arm. When the gasbag has a fixed pressure, top roller can gain different pressure by changing the position of conversion stud. It is stable to gain pressure and very easy to operate. Even after cot repaired and grinded, the needed pressure still can be maintained by adjustment.
Top roller gauge can be adjusted in a wide range and the scales are easy and clear to read.
After pendulum arm lifted, the rigid positioning angle is 35°.