Linear Motion in Winding Systems Control （在绕组直线运动系统控制）.pdf

Linear Motion in Winding Systems In winding machines or take up systems the traversing assembly is the component which moves the material being spooled back and forth across the spool/reel core (fig. 1). The traversing assembly usually includes a nut which holds a guide or roller for the wire, rope or other material (fig. 2). To achieve a finished spool with smooth, evenly spaced rows of material, it is necessary to synchronize the linear motion of the traversing nut with the rotation of the take up spool. Fig. 1 Fig. 2 Traverse assembly on winding Wire guide mounted on top of machine. traversing nut. For example, suppose the application is level winding of wire that is 0.375 inches thick. For a level wind, the traversing nut must travel in a linear direction 0.375 inch per one spool revolution. This assures that each row of wire is correctly spaced across the spool core from one spool flange to the opposite flange. If the nut moves less than 0.375 inches, the material will overlap; if more than 0.375 inches then there will be spaces between the rows. Fig. 3 A screw is cut to a specific linear pitch which cannot be changed. If material with a different thickness or diameter is spooled, a different pitch for the traversing nut is needed. This is accomplished with a controller which integrates the traverse assembly drive motor with the spool drive motor to synchronize the linear motion of the traversing nut with the rotation motion of the spool. The linear distance traveled by the traversing nut -- 0.375 inches in the example above -- is referred to as the linear pitch of the nut. Screw-based traversing assemblies use electronic controls to synchronize pitch with spool rotation (fig. 3). Mechanical traversing assemblies do not require an electronic control system (fig. 4). However, whereas t