Specifications: Introduction: The traditional renovation method is only changing type A272F into three-up three-down pressure rod structure. The pressure rod is rotary type . The rub at right angle about busbar during the process of feeding cotton silver can cause unexpected drafting easily. The putting up and scattering cotton is easily brought in the drafting area. This phenomenon can not be changed by drafting structure. Thus, it is the disadvantage in improving the drawing quality. In order to avoid this disadvantage, according to the experience of improving the old type drawing frame, adopting the technique of FA302 drawing frame, our factory has succeeded in changing A272F drawing frame structure into overhead stand busbar. Overhead stand busbar(picture shows) is short circuit, conic feeding, no turning, small friction resistance. Use four photoelectricity testing automatic stop and two groups mechanism automatic stop arrangement . This is good for improving the quality of cotton silver.